diff --git a/example/src/tmq.c b/example/src/tmq.c
index 31bfe4197f793504d33aee357772842f49e5e8e5..64b631159b1f047346de76fdb1122b0a4e4ccd77 100644
--- a/example/src/tmq.c
+++ b/example/src/tmq.c
@@ -135,30 +135,30 @@ void basic_consume_loop(tmq_t *tmq,
     fprintf(stderr, "%% Consumer closed\n");
 }
 
-void sync_consume_loop(tmq_t *rk,
+void sync_consume_loop(tmq_t *tmq,
                   tmq_list_t *topics) {
   static const int MIN_COMMIT_COUNT = 1000;
 
   int msg_count = 0;
   tmq_resp_err_t err;
 
-  if ((err = tmq_subscribe(rk, topics))) {
+  if ((err = tmq_subscribe(tmq, topics))) {
     fprintf(stderr, "%% Failed to start consuming topics: %s\n", tmq_err2str(err));
     return;
   }
 
   while (running) {
-    tmq_message_t *tmqmessage = tmq_consumer_poll(rk, 500);
+    tmq_message_t *tmqmessage = tmq_consumer_poll(tmq, 500);
     if (tmqmessage) {
       msg_process(tmqmessage);
       tmq_message_destroy(tmqmessage);
 
       if ((++msg_count % MIN_COMMIT_COUNT) == 0)
-        tmq_commit(rk, NULL, 0);
+        tmq_commit(tmq, NULL, 0);
     }
  }
 
-  err = tmq_consumer_close(rk);
+  err = tmq_consumer_close(tmq);
   if (err)
     fprintf(stderr, "%% Failed to close consumer: %s\n", tmq_err2str(err));
   else
diff --git a/include/common/tmsg.h b/include/common/tmsg.h
index 2be2b0466e9be5f98bf75a37eaedee0f97c3fa88..8a17d9d710d29513cadf4ecac470a72a14c4629e 100644
--- a/include/common/tmsg.h
+++ b/include/common/tmsg.h
@@ -154,8 +154,8 @@ typedef enum _mgmt_table {
 
 typedef struct {
   int32_t vgId;
-  char*   dbName;
-  char*   tableFullName;
+  char*   dbFName;
+  char*   tbName;
 } SBuildTableMetaInput;
 
 typedef struct {
@@ -697,8 +697,8 @@ typedef struct {
 
 typedef struct {
   SMsgHead header;
-  char     dbFname[TSDB_DB_FNAME_LEN];
-  char     tableFname[TSDB_TABLE_FNAME_LEN];
+  char     dbFName[TSDB_DB_FNAME_LEN];
+  char     tbName[TSDB_TABLE_NAME_LEN];
 } STableInfoReq;
 
 typedef struct {
@@ -723,9 +723,9 @@ typedef struct {
 } SVgroupsInfo;
 
 typedef struct {
-  char     tbFname[TSDB_TABLE_FNAME_LEN];  // table full name
-  char     stbFname[TSDB_TABLE_FNAME_LEN];
-  char     dbFname[TSDB_DB_FNAME_LEN];
+  char     tbName[TSDB_TABLE_NAME_LEN];
+  char     stbName[TSDB_TABLE_NAME_LEN];
+  char     dbFName[TSDB_DB_FNAME_LEN];
   int32_t  numOfTags;
   int32_t  numOfColumns;
   int8_t   precision;
diff --git a/include/common/ttokendef.h b/include/common/ttokendef.h
index b2a64bfac4013d5566b94e2e1ebb15e785205a07..98903f5617868bdc644319ebca59b1a8c4e0e3dc 100644
--- a/include/common/ttokendef.h
+++ b/include/common/ttokendef.h
@@ -273,12 +273,11 @@
 #define NEW_TK_SOFFSET                         64
 #define NEW_TK_LIMIT                           65
 #define NEW_TK_OFFSET                          66
-#define NEW_TK_NK_LR                           67
-#define NEW_TK_ASC                             68
-#define NEW_TK_DESC                            69
-#define NEW_TK_NULLS                           70
-#define NEW_TK_FIRST                           71
-#define NEW_TK_LAST                            72
+#define NEW_TK_ASC                             67
+#define NEW_TK_DESC                            68
+#define NEW_TK_NULLS                           69
+#define NEW_TK_FIRST                           70
+#define NEW_TK_LAST                            71
 
 #define TK_SPACE                          300
 #define TK_COMMENT                        301
diff --git a/include/libs/catalog/catalog.h b/include/libs/catalog/catalog.h
index 0b465b7b4e01f65d41fda565ca43f16c1e9b7853..c291ebd8fd3563761434f9ba03869271341ff432 100644
--- a/include/libs/catalog/catalog.h
+++ b/include/libs/catalog/catalog.h
@@ -49,17 +49,19 @@ typedef struct SCatalogCfg {
   uint32_t maxTblCacheNum;
   uint32_t maxDBCacheNum;
   uint32_t dbRentSec;
-  uint32_t stableRentSec;
+  uint32_t stbRentSec;
 } SCatalogCfg;
 
 typedef struct SSTableMetaVersion {
+  char     dbFName[TSDB_DB_FNAME_LEN];
+  char     stbName[TSDB_TABLE_NAME_LEN];
   uint64_t suid;
   int16_t  sversion;
   int16_t  tversion;  
 } SSTableMetaVersion;
 
 typedef struct SDbVgVersion {
-  char    dbName[TSDB_DB_FNAME_LEN];
+  char    dbFName[TSDB_DB_FNAME_LEN];
   int64_t dbId;
   int32_t vgVersion;
 } SDbVgVersion;
@@ -99,7 +101,9 @@ int32_t catalogGetDBVgroup(struct SCatalog* pCatalog, void *pTransporter, const
 
 int32_t catalogUpdateDBVgroup(struct SCatalog* pCatalog, const char* dbName, SDBVgroupInfo* dbInfo);
 
-int32_t catalogRemoveDBVgroup(struct SCatalog* pCatalog, SDbVgVersion* dbInfo);
+int32_t catalogRemoveDB(struct SCatalog* pCatalog, const char* dbName, uint64_t dbId);
+
+int32_t catalogRemoveSTableMeta(struct SCatalog* pCatalog, const char* dbName, const char* stbName, uint64_t suid);
 
 /**
  * Get a table's meta data. 
diff --git a/include/libs/qcom/query.h b/include/libs/qcom/query.h
index c7ca2d9e1d2fb120cac90b0ba7c586a1651447fd..2e4093590ddb05dbd14f8d3c26939c9185c0d54a 100644
--- a/include/libs/qcom/query.h
+++ b/include/libs/qcom/query.h
@@ -81,16 +81,15 @@ typedef struct STableMeta {
 } STableMeta;
 
 typedef struct SDBVgroupInfo {
-  SRWLatch  lock;
   uint64_t  dbId;
   int32_t   vgVersion;  
   int8_t    hashMethod;
-  SHashObj *vgInfo;  //key:vgId, value:SVgroupInfo
+  SHashObj *vgHash;  //key:vgId, value:SVgroupInfo
 } SDBVgroupInfo;
 
 typedef struct SUseDbOutput {
-  char db[TSDB_DB_FNAME_LEN];
-  SDBVgroupInfo dbVgroup;
+  char           db[TSDB_DB_FNAME_LEN];
+  SDBVgroupInfo *dbVgroup;
 } SUseDbOutput;
 
 enum {
@@ -103,8 +102,9 @@ enum {
 
 typedef struct STableMetaOutput {
   int32_t     metaType;
-  char        ctbFname[TSDB_TABLE_FNAME_LEN];
-  char        tbFname[TSDB_TABLE_FNAME_LEN];
+  char        dbFName[TSDB_DB_FNAME_LEN];
+  char        ctbName[TSDB_TABLE_NAME_LEN];
+  char        tbName[TSDB_TABLE_NAME_LEN];
   SCTableMeta ctbMeta;
   STableMeta *tbMeta;
 } STableMetaOutput;
diff --git a/include/nodes/nodes.h b/include/nodes/nodes.h
index 39638b37578f63006955ddf189b35c1b4a0b4770..ccb135aa0dcc42f096c1505596ac2d736baf151e 100644
--- a/include/nodes/nodes.h
+++ b/include/nodes/nodes.h
@@ -78,6 +78,11 @@ typedef struct SNodeList {
   SListCell* pTail;
 } SNodeList;
 
+typedef struct SNameStr {
+  int32_t len;
+  char* pName;
+} SNameStr;
+
 typedef struct SDataType {
   uint8_t type;
   uint8_t precision;
@@ -89,6 +94,7 @@ typedef struct SExprNode {
   ENodeType nodeType;
   SDataType resType;
   char aliasName[TSDB_COL_NAME_LEN];
+  SNodeList* pAssociationList;
 } SExprNode;
 
 typedef enum EColumnType {
@@ -102,7 +108,9 @@ typedef struct SColumnNode {
   EColumnType colType; // column or tag
   char dbName[TSDB_DB_NAME_LEN];
   char tableName[TSDB_TABLE_NAME_LEN];
+  char tableAlias[TSDB_TABLE_NAME_LEN];
   char colName[TSDB_COL_NAME_LEN];
+  SNode* pProjectRef;
 } SColumnNode;
 
 typedef struct SValueNode {
@@ -176,13 +184,16 @@ typedef struct SFunctionNode {
 
 typedef struct STableNode {
   ENodeType type;
+  char dbName[TSDB_DB_NAME_LEN];
   char tableName[TSDB_TABLE_NAME_LEN];
-  char tableAliasName[TSDB_COL_NAME_LEN];
+  char tableAlias[TSDB_TABLE_NAME_LEN];
 } STableNode;
 
+struct STableMeta;
+
 typedef struct SRealTableNode {
   STableNode table; // QUERY_NODE_REAL_TABLE
-  char dbName[TSDB_DB_NAME_LEN];
+  struct STableMeta* pMeta;
 } SRealTableNode;
 
 typedef struct STempTableNode {
@@ -273,7 +284,6 @@ typedef struct SFillNode {
 typedef struct SSelectStmt {
   ENodeType type; // QUERY_NODE_SELECT_STMT
   bool isDistinct;
-  bool isStar;
   SNodeList* pProjectionList; // SNode
   SNode* pFromTable;
   SNode* pWhere;
@@ -295,6 +305,8 @@ typedef struct SSetOperator {
   ESetOperatorType opType;
   SNode* pLeft;
   SNode* pRight;
+  SNodeList* pOrderByList; // SOrderByExprNode
+  SNode* pLimit;
 } SSetOperator;
 
 SNode* nodesMakeNode(ENodeType type);
@@ -306,8 +318,10 @@ void nodesDestroyList(SNodeList* pList);
 
 typedef bool (*FQueryNodeWalker)(SNode* pNode, void* pContext);
 
-bool nodesWalkNode(SNode* pNode, FQueryNodeWalker walker, void* pContext);
-bool nodesWalkList(SNodeList* pList, FQueryNodeWalker walker, void* pContext);
+void nodesWalkNode(SNode* pNode, FQueryNodeWalker walker, void* pContext);
+void nodesWalkList(SNodeList* pList, FQueryNodeWalker walker, void* pContext);
+void nodesWalkNodePostOrder(SNode* pNode, FQueryNodeWalker walker, void* pContext);
+void nodesWalkListPostOrder(SNodeList* pList, FQueryNodeWalker walker, void* pContext);
 
 bool nodesWalkStmt(SNode* pNode, FQueryNodeWalker walker, void* pContext);
 
diff --git a/include/util/taoserror.h b/include/util/taoserror.h
index 50af44a94c6370117b04b7d2eb273b9babd82a41..b5740b0118c1286a1d38a73575d3227c998f3e10 100644
--- a/include/util/taoserror.h
+++ b/include/util/taoserror.h
@@ -440,7 +440,10 @@ int32_t* taosGetErrno();
 #define TSDB_CODE_SCH_STATUS_ERROR              TAOS_DEF_ERROR_CODE(0, 0x2501)  //scheduler status error
 #define TSDB_CODE_SCH_INTERNAL_ERROR            TAOS_DEF_ERROR_CODE(0, 0x2502)  //scheduler internal error
 
-
+//parser
+#define TSDB_CODE_PARSER_INVALID_COLUMN         TAOS_DEF_ERROR_CODE(0, 0x2601)  //invalid column name
+#define TSDB_CODE_PARSER_TABLE_NOT_EXIST        TAOS_DEF_ERROR_CODE(0, 0x2602)  //table not exist
+#define TSDB_CODE_PARSER_AMBIGUOUS_COLUMN       TAOS_DEF_ERROR_CODE(0, 0x2603)  //ambiguous column
 
 #ifdef __cplusplus
 }
diff --git a/source/client/src/clientHb.c b/source/client/src/clientHb.c
index 7b8289aed2e39b7137a3a08b60281d1a02832962..d265ffaa94d9712bc2ea081d74bdfc8ffe1d5adc 100644
--- a/source/client/src/clientHb.c
+++ b/source/client/src/clientHb.c
@@ -41,19 +41,14 @@ static int32_t hbProcessDBInfoRsp(void *value, int32_t valueLen, struct SCatalog
     tscDebug("hb db rsp, db:%s, vgVersion:%d, uid:%"PRIx64, rsp->db, rsp->vgVersion, rsp->uid);
     
     if (rsp->vgVersion < 0) {
-      SDbVgVersion dbInfo;
-      strcpy(dbInfo.dbName, rsp->db);
-      dbInfo.dbId = rsp->uid;
-      dbInfo.vgVersion = rsp->vgVersion;
-      
-      code = catalogRemoveDBVgroup(pCatalog, &dbInfo);
+      code = catalogRemoveDB(pCatalog, rsp->db, rsp->uid);
     } else {
       SDBVgroupInfo vgInfo = {0};
       vgInfo.dbId = rsp->uid;
       vgInfo.vgVersion = rsp->vgVersion;
       vgInfo.hashMethod = rsp->hashMethod;
-      vgInfo.vgInfo = taosHashInit(rsp->vgNum, taosGetDefaultHashFunction(TSDB_DATA_TYPE_INT), true, HASH_ENTRY_LOCK);
-      if (NULL == vgInfo.vgInfo) {
+      vgInfo.vgHash = taosHashInit(rsp->vgNum, taosGetDefaultHashFunction(TSDB_DATA_TYPE_INT), true, HASH_ENTRY_LOCK);
+      if (NULL == vgInfo.vgHash) {
         tscError("hash init[%d] failed", rsp->vgNum);
         return TSDB_CODE_TSC_OUT_OF_MEMORY;
       }
@@ -67,16 +62,16 @@ static int32_t hbProcessDBInfoRsp(void *value, int32_t valueLen, struct SCatalog
           rsp->vgroupInfo[i].epset.eps[n].port = ntohs(rsp->vgroupInfo[i].epset.eps[n].port);
         }
 
-        if (0 != taosHashPut(vgInfo.vgInfo, &rsp->vgroupInfo[i].vgId, sizeof(rsp->vgroupInfo[i].vgId), &rsp->vgroupInfo[i], sizeof(rsp->vgroupInfo[i]))) {
+        if (0 != taosHashPut(vgInfo.vgHash, &rsp->vgroupInfo[i].vgId, sizeof(rsp->vgroupInfo[i].vgId), &rsp->vgroupInfo[i], sizeof(rsp->vgroupInfo[i]))) {
           tscError("hash push failed, errno:%d", errno);
-          taosHashCleanup(vgInfo.vgInfo);
+          taosHashCleanup(vgInfo.vgHash);
           return TSDB_CODE_TSC_OUT_OF_MEMORY;
         }
       }  
       
       code = catalogUpdateDBVgroup(pCatalog, rsp->db, &vgInfo);
       if (code) {
-        taosHashCleanup(vgInfo.vgInfo);
+        taosHashCleanup(vgInfo.vgHash);
       }
     }
 
@@ -90,6 +85,75 @@ static int32_t hbProcessDBInfoRsp(void *value, int32_t valueLen, struct SCatalog
   return TSDB_CODE_SUCCESS;
 }
 
+static int32_t hbProcessStbInfoRsp(void *value, int32_t valueLen, struct SCatalog *pCatalog) {
+  int32_t msgLen = 0;
+  int32_t code = 0;
+  int32_t schemaNum = 0;
+  
+  while (msgLen < valueLen) {
+    STableMetaRsp *rsp = (STableMetaRsp *)((char *)value + msgLen);
+
+    rsp->numOfColumns = ntohl(rsp->numOfColumns);
+    rsp->suid = be64toh(rsp->suid);
+    
+    if (rsp->numOfColumns < 0) {
+      schemaNum = 0;
+      
+      tscDebug("hb remove stb, db:%s, stb:%s", rsp->dbFName, rsp->stbName);
+
+      code = catalogRemoveSTableMeta(pCatalog, rsp->dbFName, rsp->stbName, rsp->suid);
+    } else {
+      rsp->numOfTags = ntohl(rsp->numOfTags);
+      
+      schemaNum = rsp->numOfColumns + rsp->numOfTags;
+/*      
+      rsp->vgNum = ntohl(rsp->vgNum);
+      rsp->uid = be64toh(rsp->uid);
+
+      SDBVgroupInfo vgInfo = {0};
+      vgInfo.dbId = rsp->uid;
+      vgInfo.vgVersion = rsp->vgVersion;
+      vgInfo.hashMethod = rsp->hashMethod;
+      vgInfo.vgHash = taosHashInit(rsp->vgNum, taosGetDefaultHashFunction(TSDB_DATA_TYPE_INT), true, HASH_ENTRY_LOCK);
+      if (NULL == vgInfo.vgHash) {
+        tscError("hash init[%d] failed", rsp->vgNum);
+        return TSDB_CODE_TSC_OUT_OF_MEMORY;
+      }
+
+      for (int32_t i = 0; i < rsp->vgNum; ++i) {
+        rsp->vgroupInfo[i].vgId = ntohl(rsp->vgroupInfo[i].vgId);
+        rsp->vgroupInfo[i].hashBegin = ntohl(rsp->vgroupInfo[i].hashBegin);
+        rsp->vgroupInfo[i].hashEnd = ntohl(rsp->vgroupInfo[i].hashEnd);
+
+        for (int32_t n = 0; n < rsp->vgroupInfo[i].epset.numOfEps; ++n) {
+          rsp->vgroupInfo[i].epset.eps[n].port = ntohs(rsp->vgroupInfo[i].epset.eps[n].port);
+        }
+
+        if (0 != taosHashPut(vgInfo.vgHash, &rsp->vgroupInfo[i].vgId, sizeof(rsp->vgroupInfo[i].vgId), &rsp->vgroupInfo[i], sizeof(rsp->vgroupInfo[i]))) {
+          tscError("hash push failed, errno:%d", errno);
+          taosHashCleanup(vgInfo.vgHash);
+          return TSDB_CODE_TSC_OUT_OF_MEMORY;
+        }
+      }  
+      
+      code = catalogUpdateDBVgroup(pCatalog, rsp->db, &vgInfo);
+      if (code) {
+        taosHashCleanup(vgInfo.vgHash);
+      }
+*/      
+    }
+
+    if (code) {
+      return code;
+    }
+
+    msgLen += sizeof(STableMetaRsp) + schemaNum * sizeof(SSchema);
+  }
+
+  return TSDB_CODE_SUCCESS;
+}
+
+
 static int32_t hbQueryHbRspHandle(struct SAppHbMgr *pAppHbMgr, SClientHbRsp* pRsp) {
   SHbConnInfo * info = taosHashGet(pAppHbMgr->connInfo, &pRsp->connKey, sizeof(SClientHbKey));
   if (NULL == info) {
@@ -122,9 +186,24 @@ static int32_t hbQueryHbRspHandle(struct SAppHbMgr *pAppHbMgr, SClientHbRsp* pRs
         hbProcessDBInfoRsp(kv->value, kv->valueLen, pCatalog);
         break;
       }
-      case HEARTBEAT_KEY_STBINFO:
+      case HEARTBEAT_KEY_STBINFO:{
+        if (kv->valueLen <= 0 || NULL == kv->value) {
+          tscError("invalid hb stb info, len:%d, value:%p", kv->valueLen, kv->value);
+          break;
+        }
+
+        int64_t *clusterId = (int64_t *)info->param;
+        struct SCatalog *pCatalog = NULL;
+        
+        int32_t code = catalogGetHandle(*clusterId, &pCatalog);
+        if (code != TSDB_CODE_SUCCESS) {
+          tscWarn("catalogGetHandle failed, clusterId:%"PRIx64", error:%s", *clusterId, tstrerror(code));
+          break;
+        }
 
+        hbProcessStbInfoRsp(kv->value, kv->valueLen, pCatalog);
         break;
+      }
       default:
         tscError("invalid hb key type:%d", kv->key);
         break;
@@ -157,7 +236,7 @@ static int32_t hbMqAsyncCallBack(void* param, const SDataBuf* pMsg, int32_t code
   tfree(param);
 
   if (rspNum) {
-    tscDebug("hb got %d rsp, %d empty rsp prior", rspNum, atomic_val_compare_exchange_32(&emptyRspNum, emptyRspNum, 0));
+    tscDebug("hb got %d rsp, %d empty rsp received before", rspNum, atomic_val_compare_exchange_32(&emptyRspNum, emptyRspNum, 0));
   } else {
     atomic_add_fetch_32(&emptyRspNum, 1);
   }
@@ -204,6 +283,37 @@ int32_t hbGetExpiredDBInfo(SClientHbKey *connKey, struct SCatalog *pCatalog, SCl
   return TSDB_CODE_SUCCESS;
 }
 
+int32_t hbGetExpiredStbInfo(SClientHbKey *connKey, struct SCatalog *pCatalog, SClientHbReq *req) {
+  SSTableMetaVersion *stbs = NULL;
+  uint32_t stbNum = 0;
+  int32_t code = 0;
+
+  code = catalogGetExpiredSTables(pCatalog, &stbs, &stbNum);
+  if (TSDB_CODE_SUCCESS != code) {
+    return code;
+  }
+
+  if (stbNum <= 0) {
+    return TSDB_CODE_SUCCESS;
+  }
+
+  for (int32_t i = 0; i < stbNum; ++i) {
+    SSTableMetaVersion *stb = &stbs[i];
+    stb->suid = htobe64(stb->suid);
+    stb->sversion = htons(stb->sversion);
+    stb->tversion = htons(stb->tversion);    
+  }
+
+  SKv kv = {.key = HEARTBEAT_KEY_STBINFO, .valueLen = sizeof(SSTableMetaVersion) * stbNum, .value = stbs};
+
+  tscDebug("hb got %d expired stb, valueLen:%d", stbNum, kv.valueLen);
+
+  taosHashPut(req->info, &kv.key, sizeof(kv.key), &kv, sizeof(kv));
+
+  return TSDB_CODE_SUCCESS;
+}
+
+
 int32_t hbQueryHbReqHandle(SClientHbKey *connKey, void* param, SClientHbReq *req) {
   int64_t *clusterId = (int64_t *)param;
   struct SCatalog *pCatalog = NULL;
@@ -219,6 +329,11 @@ int32_t hbQueryHbReqHandle(SClientHbKey *connKey, void* param, SClientHbReq *req
     return code;
   }
 
+  code = hbGetExpiredStbInfo(connKey, pCatalog, req);
+  if (TSDB_CODE_SUCCESS != code) {
+    return code;
+  }
+
 
   return TSDB_CODE_SUCCESS;
 }
@@ -389,7 +504,6 @@ static void hbStopThread() {
 }
 
 SAppHbMgr* appHbMgrInit(SAppInstInfo* pAppInstInfo, char *key) {
-  return NULL;
   hbMgrInit();
   SAppHbMgr* pAppHbMgr = malloc(sizeof(SAppHbMgr)); 
   if (pAppHbMgr == NULL) {
@@ -447,7 +561,6 @@ void appHbMgrCleanup(void) {
 }
 
 int hbMgrInit() {
-  return 0;
   // init once
   int8_t old = atomic_val_compare_exchange_8(&clientHbMgr.inited, 0, 1);
   if (old == 1) return 0;
@@ -504,7 +617,6 @@ int hbRegisterConnImpl(SAppHbMgr* pAppHbMgr, SClientHbKey connKey, SHbConnInfo *
 }
 
 int hbRegisterConn(SAppHbMgr* pAppHbMgr, int32_t connId, int64_t clusterId, int32_t hbType) {
-  return 0;
   SClientHbKey connKey = {.connId = connId, .hbType = HEARTBEAT_TYPE_QUERY};
   SHbConnInfo info = {0};
 
diff --git a/source/client/src/clientImpl.c b/source/client/src/clientImpl.c
index c60b89f78e840753d5d79cb59c6242d87589aed3..dfe7b12ce49aa870920f9bd05900b67b5f1767d8 100644
--- a/source/client/src/clientImpl.c
+++ b/source/client/src/clientImpl.c
@@ -105,11 +105,12 @@ TAOS *taos_connect_internal(const char *ip, const char *user, const char *pass,
   pthread_mutex_lock(&appInfo.mutex);
 
   pInst = taosHashGet(appInfo.pInstMap, key, strlen(key));
+  SAppInstInfo* p = NULL;
   if (pInst == NULL) {
-    SAppInstInfo* p = calloc(1, sizeof(struct SAppInstInfo));
+    p = calloc(1, sizeof(struct SAppInstInfo));
     p->mgmtEp       = epSet;
     p->pTransporter = openTransporter(user, secretEncrypt, tsNumOfCores);
-    /*p->pAppHbMgr = appHbMgrInit(p, key);*/
+    p->pAppHbMgr = appHbMgrInit(p, key);
     taosHashPut(appInfo.pInstMap, key, strlen(key), &p, POINTER_BYTES);
 
     pInst = &p;
diff --git a/source/client/src/clientMsgHandler.c b/source/client/src/clientMsgHandler.c
index 7e897287f654929af3b3f0bf8a809174196b89ba..8ab1880069dd015aab08015217ea3f925741e80b 100644
--- a/source/client/src/clientMsgHandler.c
+++ b/source/client/src/clientMsgHandler.c
@@ -76,7 +76,7 @@ int processConnectRsp(void* param, const SDataBuf* pMsg, int32_t code) {
 
   pTscObj->connType = HEARTBEAT_TYPE_QUERY;
 
-  /*hbRegisterConn(pTscObj->pAppInfo->pAppHbMgr, pConnect->connId, pConnect->clusterId, HEARTBEAT_TYPE_QUERY);*/
+  hbRegisterConn(pTscObj->pAppInfo->pAppHbMgr, pConnect->connId, pConnect->clusterId, HEARTBEAT_TYPE_QUERY);
 
   //  pRequest->body.resInfo.pRspMsg = pMsg->pData;
   tscDebug("0x%" PRIx64 " clusterId:%" PRId64 ", totalConn:%" PRId64, pRequest->requestId, pConnect->clusterId,
@@ -302,15 +302,12 @@ int32_t processDropDbRsp(void* param, const SDataBuf* pMsg, int32_t code) {
 
   SDropDbRsp *rsp = (SDropDbRsp *)pMsg->pData;
 
-  SDbVgVersion dbVer = {0};
   struct SCatalog *pCatalog = NULL;
-  
-  strncpy(dbVer.dbName, rsp->db, sizeof(dbVer.dbName));
-  dbVer.dbId = be64toh(rsp->uid);
+  rsp->uid = be64toh(rsp->uid);
 
   catalogGetHandle(pRequest->pTscObj->pAppInfo->clusterId, &pCatalog);
   
-  catalogRemoveDBVgroup(pCatalog, &dbVer);
+  catalogRemoveDB(pCatalog, rsp->db, rsp->uid);
 
   tsem_post(&pRequest->body.rspSem);
   return code;
diff --git a/source/client/test/CMakeLists.txt b/source/client/test/CMakeLists.txt
index 3614e4364ba77f020ce30c95be88ea0c4c7235d9..ee5109860e52968d487cad9ace18153443974f32 100644
--- a/source/client/test/CMakeLists.txt
+++ b/source/client/test/CMakeLists.txt
@@ -5,14 +5,26 @@ MESSAGE(STATUS "build parser unit test")
 SET(CMAKE_CXX_STANDARD 11)
 AUX_SOURCE_DIRECTORY(${CMAKE_CURRENT_SOURCE_DIR} SOURCE_LIST)
 
-ADD_EXECUTABLE(clientTest ${SOURCE_LIST})
+ADD_EXECUTABLE(clientTest clientTests.cpp)
 TARGET_LINK_LIBRARIES(
         clientTest
         PUBLIC os util common transport parser catalog scheduler function gtest taos qcom
 )
 
+ADD_EXECUTABLE(tmqTest tmqTest.cpp)
+TARGET_LINK_LIBRARIES(
+        tmqTest
+        PUBLIC os util common transport parser catalog scheduler function gtest taos qcom
+)
+
 TARGET_INCLUDE_DIRECTORIES(
         clientTest
         PUBLIC "${CMAKE_SOURCE_DIR}/include/libs/client/"
         PRIVATE "${CMAKE_SOURCE_DIR}/source/libs/client/inc"
 )
+
+TARGET_INCLUDE_DIRECTORIES(
+        tmqTest
+        PUBLIC "${CMAKE_SOURCE_DIR}/include/libs/client/"
+        PRIVATE "${CMAKE_SOURCE_DIR}/source/libs/client/inc"
+)
diff --git a/source/client/test/clientTests.cpp b/source/client/test/clientTests.cpp
index 553dacafddc41a08019b57401a43ef5f5df1caa6..1e68faa4f471e0467b0d6d2ba0ad9123a9918c16 100644
--- a/source/client/test/clientTests.cpp
+++ b/source/client/test/clientTests.cpp
@@ -564,119 +564,6 @@ TEST(testCase, insert_test) {
 }
 #endif
 
-TEST(testCase, create_topic_ctb_Test) {
-  TAOS* pConn = taos_connect("localhost", "root", "taosdata", NULL, 0);
-  assert(pConn != NULL);
-
-  TAOS_RES* pRes = taos_query(pConn, "use abc1");
-  if (taos_errno(pRes) != 0) {
-    printf("error in use db, reason:%s\n", taos_errstr(pRes));
-  }
-  //taos_free_result(pRes);
-
-  TAOS_FIELD* pFields = taos_fetch_fields(pRes);
-  ASSERT_TRUE(pFields == nullptr);
-
-  int32_t numOfFields = taos_num_fields(pRes);
-  ASSERT_EQ(numOfFields, 0);
-
-  taos_free_result(pRes);
-
-  char* sql = "select * from tu";
-  pRes = tmq_create_topic(pConn, "test_ctb_topic_1", sql, strlen(sql));
-  taos_free_result(pRes);
-  taos_close(pConn);
-}
-
-TEST(testCase, create_topic_stb_Test) {
-  TAOS* pConn = taos_connect("localhost", "root", "taosdata", NULL, 0);
-  assert(pConn != NULL);
-
-  TAOS_RES* pRes = taos_query(pConn, "use abc1");
-  if (taos_errno(pRes) != 0) {
-    printf("error in use db, reason:%s\n", taos_errstr(pRes));
-  }
-  //taos_free_result(pRes);
-
-  TAOS_FIELD* pFields = taos_fetch_fields(pRes);
-  ASSERT_TRUE(pFields == nullptr);
-
-  int32_t numOfFields = taos_num_fields(pRes);
-  ASSERT_EQ(numOfFields, 0);
-
-  taos_free_result(pRes);
-
-  char* sql = "select * from st1";
-  pRes = tmq_create_topic(pConn, "test_stb_topic_1", sql, strlen(sql));
-  taos_free_result(pRes);
-  taos_close(pConn);
-}
-
-#if 0
-TEST(testCase, tmq_subscribe_ctb_Test) {
-  TAOS* pConn = taos_connect("localhost", "root", "taosdata", NULL, 0);
-  assert(pConn != NULL);
-
-  TAOS_RES* pRes = taos_query(pConn, "use abc1");
-  if (taos_errno(pRes) != 0) {
-    printf("error in use db, reason:%s\n", taos_errstr(pRes));
-  }
-  taos_free_result(pRes);
-
-  tmq_conf_t* conf = tmq_conf_new();
-  tmq_conf_set(conf, "group.id", "tg1");
-  tmq_t* tmq = tmq_consumer_new(pConn, conf, NULL, 0);
-
-  tmq_list_t* topic_list = tmq_list_new();
-  tmq_list_append(topic_list, "test_ctb_topic_1");
-  tmq_subscribe(tmq, topic_list);
-
-  while (1) {
-    tmq_message_t* msg = tmq_consumer_poll(tmq, 1000);
-    tmq_message_destroy(msg);
-    //printf("get msg\n");
-    //if (msg == NULL) break;
-  }
-}
-#endif
-
-TEST(testCase, tmq_subscribe_stb_Test) {
-  TAOS* pConn = taos_connect("localhost", "root", "taosdata", NULL, 0);
-  assert(pConn != NULL);
-
-  TAOS_RES* pRes = taos_query(pConn, "use abc1");
-  if (taos_errno(pRes) != 0) {
-    printf("error in use db, reason:%s\n", taos_errstr(pRes));
-  }
-  taos_free_result(pRes);
-
-  tmq_conf_t* conf = tmq_conf_new();
-  tmq_conf_set(conf, "group.id", "tg2");
-  tmq_t* tmq = tmq_consumer_new(pConn, conf, NULL, 0);
-
-  tmq_list_t* topic_list = tmq_list_new();
-  tmq_list_append(topic_list, "test_stb_topic_1");
-  tmq_subscribe(tmq, topic_list);
-  
-  int cnt = 1;
-  while (1) {
-    tmq_message_t* msg = tmq_consumer_poll(tmq, 1000);
-    if (msg == NULL) continue;
-    tmqShowMsg(msg);
-    if (cnt++ % 10 == 0){
-      tmq_commit(tmq, NULL, 0);
-    }
-    //tmq_commit(tmq, NULL, 0);
-    tmq_message_destroy(msg);
-    //printf("get msg\n");
-  }
-}
-
-TEST(testCase, tmq_consume_Test) {
-}
-
-TEST(testCase, tmq_commit_TEST) {
-}
 
 #if 0
 TEST(testCase, projection_query_tables) {
diff --git a/source/client/test/tmqTest.cpp b/source/client/test/tmqTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..f767e7faef15d5bfd32230d4d4758a2dd057d580
--- /dev/null
+++ b/source/client/test/tmqTest.cpp
@@ -0,0 +1,154 @@
+/*
+ * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
+ *
+ * This program is free software: you can use, redistribute, and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3
+ * or later ("AGPL"), as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <gtest/gtest.h>
+
+#include <taoserror.h>
+#include <tglobal.h>
+#include <iostream>
+
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wwrite-strings"
+#pragma GCC diagnostic ignored "-Wunused-function"
+#pragma GCC diagnostic ignored "-Wunused-variable"
+#pragma GCC diagnostic ignored "-Wsign-compare"
+
+#include "../inc/clientInt.h"
+#include "taos.h"
+
+int main(int argc, char** argv) {
+  testing::InitGoogleTest(&argc, argv);
+  return RUN_ALL_TESTS();
+}
+
+TEST(testCase, driverInit_Test) {
+  taosInitGlobalCfg();
+//  taos_init();
+}
+
+TEST(testCase, create_topic_ctb_Test) {
+  TAOS* pConn = taos_connect("localhost", "root", "taosdata", NULL, 0);
+  assert(pConn != NULL);
+
+  TAOS_RES* pRes = taos_query(pConn, "use abc1");
+  if (taos_errno(pRes) != 0) {
+    printf("error in use db, reason:%s\n", taos_errstr(pRes));
+  }
+  //taos_free_result(pRes);
+
+  TAOS_FIELD* pFields = taos_fetch_fields(pRes);
+  ASSERT_TRUE(pFields == nullptr);
+
+  int32_t numOfFields = taos_num_fields(pRes);
+  ASSERT_EQ(numOfFields, 0);
+
+  taos_free_result(pRes);
+
+  char* sql = "select * from tu";
+  pRes = tmq_create_topic(pConn, "test_ctb_topic_1", sql, strlen(sql));
+  taos_free_result(pRes);
+  taos_close(pConn);
+}
+
+TEST(testCase, create_topic_stb_Test) {
+  TAOS* pConn = taos_connect("localhost", "root", "taosdata", NULL, 0);
+  assert(pConn != NULL);
+
+  TAOS_RES* pRes = taos_query(pConn, "use abc1");
+  if (taos_errno(pRes) != 0) {
+    printf("error in use db, reason:%s\n", taos_errstr(pRes));
+  }
+  //taos_free_result(pRes);
+
+  TAOS_FIELD* pFields = taos_fetch_fields(pRes);
+  ASSERT_TRUE(pFields == nullptr);
+
+  int32_t numOfFields = taos_num_fields(pRes);
+  ASSERT_EQ(numOfFields, 0);
+
+  taos_free_result(pRes);
+
+  char* sql = "select * from st1";
+  pRes = tmq_create_topic(pConn, "test_stb_topic_1", sql, strlen(sql));
+  taos_free_result(pRes);
+  taos_close(pConn);
+}
+
+#if 0
+TEST(testCase, tmq_subscribe_ctb_Test) {
+  TAOS* pConn = taos_connect("localhost", "root", "taosdata", NULL, 0);
+  assert(pConn != NULL);
+
+  TAOS_RES* pRes = taos_query(pConn, "use abc1");
+  if (taos_errno(pRes) != 0) {
+    printf("error in use db, reason:%s\n", taos_errstr(pRes));
+  }
+  taos_free_result(pRes);
+
+  tmq_conf_t* conf = tmq_conf_new();
+  tmq_conf_set(conf, "group.id", "tg1");
+  tmq_t* tmq = tmq_consumer_new(pConn, conf, NULL, 0);
+
+  tmq_list_t* topic_list = tmq_list_new();
+  tmq_list_append(topic_list, "test_ctb_topic_1");
+  tmq_subscribe(tmq, topic_list);
+
+  while (1) {
+    tmq_message_t* msg = tmq_consumer_poll(tmq, 1000);
+    tmq_message_destroy(msg);
+    //printf("get msg\n");
+    //if (msg == NULL) break;
+  }
+}
+
+TEST(testCase, tmq_subscribe_stb_Test) {
+  TAOS* pConn = taos_connect("localhost", "root", "taosdata", NULL, 0);
+  assert(pConn != NULL);
+
+  TAOS_RES* pRes = taos_query(pConn, "use abc1");
+  if (taos_errno(pRes) != 0) {
+    printf("error in use db, reason:%s\n", taos_errstr(pRes));
+  }
+  taos_free_result(pRes);
+
+  tmq_conf_t* conf = tmq_conf_new();
+  tmq_conf_set(conf, "group.id", "tg2");
+  tmq_t* tmq = tmq_consumer_new(pConn, conf, NULL, 0);
+
+  tmq_list_t* topic_list = tmq_list_new();
+  tmq_list_append(topic_list, "test_stb_topic_1");
+  tmq_subscribe(tmq, topic_list);
+  
+  int cnt = 1;
+  while (1) {
+    tmq_message_t* msg = tmq_consumer_poll(tmq, 1000);
+    if (msg == NULL) continue;
+    tmqShowMsg(msg);
+    if (cnt++ % 10 == 0){
+      tmq_commit(tmq, NULL, 0);
+    }
+    //tmq_commit(tmq, NULL, 0);
+    tmq_message_destroy(msg);
+    //printf("get msg\n");
+  }
+}
+
+TEST(testCase, tmq_consume_Test) {
+}
+
+TEST(testCase, tmq_commit_Test) {
+}
+
+#endif
diff --git a/source/dnode/mgmt/impl/test/sut/src/sut.cpp b/source/dnode/mgmt/impl/test/sut/src/sut.cpp
index c6e6c0006dd95e2e13ab02652d09dade8735dc4f..dc8390fba32953e427eb099efc6ddd698994809f 100644
--- a/source/dnode/mgmt/impl/test/sut/src/sut.cpp
+++ b/source/dnode/mgmt/impl/test/sut/src/sut.cpp
@@ -125,7 +125,7 @@ const char* Testbase::GetMetaName(int32_t index) {
 
 int32_t Testbase::GetMetaNum() { return pMeta->numOfColumns; }
 
-const char* Testbase::GetMetaTbName() { return pMeta->tbFname; }
+const char* Testbase::GetMetaTbName() { return pMeta->tbName; }
 
 void Testbase::SendShowRetrieveReq() {
   int32_t contLen = sizeof(SRetrieveTableReq);
@@ -144,7 +144,7 @@ void Testbase::SendShowRetrieveReq() {
   pos = 0;
 }
 
-const char* Testbase::GetShowName() { return pMeta->tbFname; }
+const char* Testbase::GetShowName() { return pMeta->tbName; }
 
 int8_t Testbase::GetShowInt8() {
   int8_t data = *((int8_t*)(pData + pos));
diff --git a/source/dnode/mnode/impl/inc/mndDef.h b/source/dnode/mnode/impl/inc/mndDef.h
index 69fdd9bd5fff092bcabbdfafd5bc131ef903102e..c9228ae78552b3c8ebd663629fe8ee981bf4c1e8 100644
--- a/source/dnode/mnode/impl/inc/mndDef.h
+++ b/source/dnode/mnode/impl/inc/mndDef.h
@@ -619,7 +619,7 @@ typedef struct SMqTopicObj {
   int64_t  createTime;
   int64_t  updateTime;
   uint64_t uid;
-  uint64_t dbUid;
+  int64_t  dbUid;
   int32_t  version;
   SRWLatch lock;
   int32_t  sqlLen;
diff --git a/source/dnode/mnode/impl/inc/mndStb.h b/source/dnode/mnode/impl/inc/mndStb.h
index 48847dc6a3d8879276f38ba02e90876325a00e20..0855b5bd4d2c178653ab3a22acccb27d8ae3893c 100644
--- a/source/dnode/mnode/impl/inc/mndStb.h
+++ b/source/dnode/mnode/impl/inc/mndStb.h
@@ -28,6 +28,9 @@ void    mndCleanupStb(SMnode *pMnode);
 SStbObj *mndAcquireStb(SMnode *pMnode, char *stbName);
 void mndReleaseStb(SMnode *pMnode, SStbObj *pStb);
 
+int32_t mndValidateStbInfo(SMnode *pMnode, SSTableMetaVersion *stbs, int32_t num, void **rsp, int32_t *rspLen);
+
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/source/dnode/mnode/impl/src/mndBnode.c b/source/dnode/mnode/impl/src/mndBnode.c
index 189cbfea6d725a207a790ef0f29805bf09e10873..c754494c2421d0dacfec7a1a54b058056093637a 100644
--- a/source/dnode/mnode/impl/src/mndBnode.c
+++ b/source/dnode/mnode/impl/src/mndBnode.c
@@ -426,7 +426,7 @@ static int32_t mndGetBnodeMeta(SMnodeMsg *pReq, SShowObj *pShow, STableMetaRsp *
 
   pShow->numOfRows = sdbGetSize(pSdb, SDB_BNODE);
   pShow->rowSize = pShow->offset[cols - 1] + pShow->bytes[cols - 1];
-  strcpy(pMeta->tbFname, mndShowStr(pShow->type));
+  strcpy(pMeta->tbName, mndShowStr(pShow->type));
 
   return 0;
 }
diff --git a/source/dnode/mnode/impl/src/mndCluster.c b/source/dnode/mnode/impl/src/mndCluster.c
index 5f806723696fb752542d91d6d19ab852e83b8295..a53298efb32c5ad6b5773c6008eb6cec982f0560 100644
--- a/source/dnode/mnode/impl/src/mndCluster.c
+++ b/source/dnode/mnode/impl/src/mndCluster.c
@@ -186,7 +186,7 @@ static int32_t mndGetClusterMeta(SMnodeMsg *pMsg, SShowObj *pShow, STableMetaRsp
   cols++;
 
   pMeta->numOfColumns = htonl(cols);
-  strcpy(pMeta->tbFname, mndShowStr(pShow->type));
+  strcpy(pMeta->tbName, mndShowStr(pShow->type));
   pShow->numOfColumns = cols;
 
   pShow->offset[0] = 0;
@@ -196,7 +196,7 @@ static int32_t mndGetClusterMeta(SMnodeMsg *pMsg, SShowObj *pShow, STableMetaRsp
 
   pShow->numOfRows = 1;
   pShow->rowSize = pShow->offset[cols - 1] + pShow->bytes[cols - 1];
-  strcpy(pMeta->tbFname, mndShowStr(pShow->type));
+  strcpy(pMeta->tbName, mndShowStr(pShow->type));
 
   return 0;
 }
diff --git a/source/dnode/mnode/impl/src/mndDb.c b/source/dnode/mnode/impl/src/mndDb.c
index 5e6f457a67dd70fbc09d3207fc09a50f1dcd4faf..1bfe8c9d9a329a04ee3916ddd209734d64d8dc6b 100644
--- a/source/dnode/mnode/impl/src/mndDb.c
+++ b/source/dnode/mnode/impl/src/mndDb.c
@@ -907,9 +907,9 @@ int32_t mndValidateDBInfo(SMnode *pMnode, SDbVgVersion *dbs, int32_t num, void *
 
     len = 0;
     
-    SDbObj *pDb = mndAcquireDb(pMnode, db->dbName);
+    SDbObj *pDb = mndAcquireDb(pMnode, db->dbFName);
     if (pDb == NULL) {
-      mInfo("db %s not exist", db->dbName);
+      mInfo("db %s not exist", db->dbFName);
       
       len = sizeof(SUseDbRsp);
     } else if (pDb->uid != db->dbId || db->vgVersion < pDb->vgVersion) {
@@ -929,7 +929,7 @@ int32_t mndValidateDBInfo(SMnode *pMnode, SDbVgVersion *dbs, int32_t num, void *
     }
     
     pRsp = (SUseDbRsp *)((char *)buf + bufOffset);
-    memcpy(pRsp->db, db->dbName, TSDB_DB_FNAME_LEN);
+    memcpy(pRsp->db, db->dbFName, TSDB_DB_FNAME_LEN);
     if (pDb) {
       int32_t vgNum = 0;
       mndBuildDBVgroupInfo(pDb, pMnode, pRsp->vgroupInfo, &vgNum);
@@ -1113,7 +1113,7 @@ static int32_t mndGetDbMeta(SMnodeMsg *pReq, SShowObj *pShow, STableMetaRsp *pMe
 
   pShow->numOfRows = sdbGetSize(pSdb, SDB_DB);
   pShow->rowSize = pShow->offset[cols - 1] + pShow->bytes[cols - 1];
-  strcpy(pMeta->tbFname, mndShowStr(pShow->type));
+  strcpy(pMeta->tbName, mndShowStr(pShow->type));
 
   return 0;
 }
diff --git a/source/dnode/mnode/impl/src/mndDnode.c b/source/dnode/mnode/impl/src/mndDnode.c
index 9a96bdb0dfa4049f75dffa9dd86c881eec863603..3b43cd8081ea5ddec4d85515d89afb0a1194826e 100644
--- a/source/dnode/mnode/impl/src/mndDnode.c
+++ b/source/dnode/mnode/impl/src/mndDnode.c
@@ -608,7 +608,7 @@ static int32_t mndGetConfigMeta(SMnodeMsg *pReq, SShowObj *pShow, STableMetaRsp
 
   pShow->numOfRows = TSDB_CONFIG_NUMBER;
   pShow->rowSize = pShow->offset[cols - 1] + pShow->bytes[cols - 1];
-  strcpy(pMeta->tbFname, mndShowStr(pShow->type));
+  strcpy(pMeta->tbName, mndShowStr(pShow->type));
 
   return 0;
 }
@@ -715,7 +715,7 @@ static int32_t mndGetDnodeMeta(SMnodeMsg *pReq, SShowObj *pShow, STableMetaRsp *
 
   pShow->numOfRows = sdbGetSize(pSdb, SDB_DNODE);
   pShow->rowSize = pShow->offset[cols - 1] + pShow->bytes[cols - 1];
-  strcpy(pMeta->tbFname, mndShowStr(pShow->type));
+  strcpy(pMeta->tbName, mndShowStr(pShow->type));
 
   return 0;
 }
diff --git a/source/dnode/mnode/impl/src/mndFunc.c b/source/dnode/mnode/impl/src/mndFunc.c
index 0e086fdb222a188e40302519426403a02bfa057a..b3fc0e1da0601c362a5c1e27798937e91ef335df 100644
--- a/source/dnode/mnode/impl/src/mndFunc.c
+++ b/source/dnode/mnode/impl/src/mndFunc.c
@@ -482,7 +482,7 @@ static int32_t mndGetFuncMeta(SMnodeMsg *pReq, SShowObj *pShow, STableMetaRsp *p
 
   pShow->numOfRows = sdbGetSize(pSdb, SDB_FUNC);
   pShow->rowSize = pShow->offset[cols - 1] + pShow->bytes[cols - 1];
-  strcpy(pMeta->tbFname, mndShowStr(pShow->type));
+  strcpy(pMeta->tbName, mndShowStr(pShow->type));
 
   return 0;
 }
diff --git a/source/dnode/mnode/impl/src/mndMnode.c b/source/dnode/mnode/impl/src/mndMnode.c
index a969c0162fc23dbf29ced4ebe2062cb524306d00..dde48853adebe124d95481856ec7ad48ad5772f7 100644
--- a/source/dnode/mnode/impl/src/mndMnode.c
+++ b/source/dnode/mnode/impl/src/mndMnode.c
@@ -624,7 +624,7 @@ static int32_t mndGetMnodeMeta(SMnodeMsg *pReq, SShowObj *pShow, STableMetaRsp *
 
   pShow->numOfRows = sdbGetSize(pSdb, SDB_MNODE);
   pShow->rowSize = pShow->offset[cols - 1] + pShow->bytes[cols - 1];
-  strcpy(pMeta->tbFname, mndShowStr(pShow->type));
+  strcpy(pMeta->tbName, mndShowStr(pShow->type));
 
   mndUpdateMnodeRole(pMnode);
   return 0;
diff --git a/source/dnode/mnode/impl/src/mndProfile.c b/source/dnode/mnode/impl/src/mndProfile.c
index d379d294abc09a9d70dcd8fcb7bc2012d268b116..d63ade4320f8976631d0d236610c2cb95a48fb77 100644
--- a/source/dnode/mnode/impl/src/mndProfile.c
+++ b/source/dnode/mnode/impl/src/mndProfile.c
@@ -18,6 +18,7 @@
 #include "mndProfile.h"
 //#include "mndConsumer.h"
 #include "mndDb.h"
+#include "mndStb.h"
 #include "mndMnode.h"
 #include "mndShow.h"
 //#include "mndTopic.h"
@@ -376,9 +377,16 @@ static int32_t mndProcessHeartBeatReq(SMnodeMsg *pReq) {
             }
             break;
           }
-          case HEARTBEAT_KEY_STBINFO:
-
+          case HEARTBEAT_KEY_STBINFO: {
+            void *rspMsg = NULL;
+            int32_t rspLen = 0;
+            mndValidateStbInfo(pMnode, (SSTableMetaVersion *)kv->value, kv->valueLen/sizeof(SSTableMetaVersion), &rspMsg, &rspLen);
+            if (rspMsg && rspLen > 0) {
+              SKv kv = {.key = HEARTBEAT_KEY_STBINFO, .valueLen = rspLen, .value = rspMsg};
+              taosArrayPush(hbRsp.info, &kv);
+            }
             break;
+          }
           default:
             mError("invalid kv key:%d", kv->key);
             hbRsp.status = TSDB_CODE_MND_APP_ERROR;
@@ -623,7 +631,7 @@ static int32_t mndGetConnsMeta(SMnodeMsg *pReq, SShowObj *pShow, STableMetaRsp *
 
   pShow->numOfRows = taosHashGetSize(pMgmt->cache->pHashTable);
   pShow->rowSize = pShow->offset[cols - 1] + pShow->bytes[cols - 1];
-  strcpy(pMeta->tbFname, mndShowStr(pShow->type));
+  strcpy(pMeta->tbName, mndShowStr(pShow->type));
 
   return 0;
 }
@@ -792,7 +800,7 @@ static int32_t mndGetQueryMeta(SMnodeMsg *pReq, SShowObj *pShow, STableMetaRsp *
 
   pShow->numOfRows = 1000000;
   pShow->rowSize = pShow->offset[cols - 1] + pShow->bytes[cols - 1];
-  strcpy(pMeta->tbFname, mndShowStr(pShow->type));
+  strcpy(pMeta->tbName, mndShowStr(pShow->type));
 
   return 0;
 }
diff --git a/source/dnode/mnode/impl/src/mndQnode.c b/source/dnode/mnode/impl/src/mndQnode.c
index 6077a95a7b21f88972c9869c9f2cf3043d8b00ba..e29ab5a5bdb3c9edd99470a40f00acf51bf3a0e3 100644
--- a/source/dnode/mnode/impl/src/mndQnode.c
+++ b/source/dnode/mnode/impl/src/mndQnode.c
@@ -426,7 +426,7 @@ static int32_t mndGetQnodeMeta(SMnodeMsg *pReq, SShowObj *pShow, STableMetaRsp *
 
   pShow->numOfRows = sdbGetSize(pSdb, SDB_QNODE);
   pShow->rowSize = pShow->offset[cols - 1] + pShow->bytes[cols - 1];
-  strcpy(pMeta->tbFname, mndShowStr(pShow->type));
+  strcpy(pMeta->tbName, mndShowStr(pShow->type));
 
   return 0;
 }
diff --git a/source/dnode/mnode/impl/src/mndSnode.c b/source/dnode/mnode/impl/src/mndSnode.c
index 7688ea76abd2f3cec2ec975cb5727391ef93e848..cbba6597193ac1fcdfdc1d74db6b99dd8c9e04ff 100644
--- a/source/dnode/mnode/impl/src/mndSnode.c
+++ b/source/dnode/mnode/impl/src/mndSnode.c
@@ -428,7 +428,7 @@ static int32_t mndGetSnodeMeta(SMnodeMsg *pReq, SShowObj *pShow, STableMetaRsp *
 
   pShow->numOfRows = sdbGetSize(pSdb, SDB_SNODE);
   pShow->rowSize = pShow->offset[cols - 1] + pShow->bytes[cols - 1];
-  strcpy(pMeta->tbFname, mndShowStr(pShow->type));
+  strcpy(pMeta->tbName, mndShowStr(pShow->type));
 
   return 0;
 }
diff --git a/source/dnode/mnode/impl/src/mndStb.c b/source/dnode/mnode/impl/src/mndStb.c
index 687e53e65ae1db3c3ef79b5a01c68d5ce56c2a29..ab0a3082ca8b24e5d76e8974961f5a436e933b62 100644
--- a/source/dnode/mnode/impl/src/mndStb.c
+++ b/source/dnode/mnode/impl/src/mndStb.c
@@ -769,20 +769,23 @@ static int32_t mndProcessStbMetaReq(SMnodeMsg *pReq) {
   SMnode        *pMnode = pReq->pMnode;
   STableInfoReq *pInfo = pReq->rpcMsg.pCont;
 
-  mDebug("stb:%s, start to retrieve meta", pInfo->tableFname);
+  char tbFName[TSDB_TABLE_FNAME_LEN] = {0};
+  snprintf(tbFName, sizeof(tbFName), "%s.%s", pInfo->dbFName, pInfo->tbName);
 
-  SDbObj *pDb = mndAcquireDbByStb(pMnode, pInfo->tableFname);
+  mDebug("stb:%s, start to retrieve meta", tbFName);
+
+  SDbObj *pDb = mndAcquireDb(pMnode, pInfo->dbFName);
   if (pDb == NULL) {
     terrno = TSDB_CODE_MND_DB_NOT_SELECTED;
-    mError("stb:%s, failed to retrieve meta since %s", pInfo->tableFname, terrstr());
+    mError("stb:%s, failed to retrieve meta since %s", tbFName, terrstr());
     return -1;
   }
 
-  SStbObj *pStb = mndAcquireStb(pMnode, pInfo->tableFname);
+  SStbObj *pStb = mndAcquireStb(pMnode, tbFName);
   if (pStb == NULL) {
     mndReleaseDb(pMnode, pDb);
     terrno = TSDB_CODE_MND_INVALID_STB;
-    mError("stb:%s, failed to get meta since %s", pInfo->tableFname, terrstr());
+    mError("stb:%s, failed to get meta since %s", tbFName, terrstr());
     return -1;
   }
 
@@ -796,11 +799,13 @@ static int32_t mndProcessStbMetaReq(SMnodeMsg *pReq) {
     mndReleaseDb(pMnode, pDb);
     mndReleaseStb(pMnode, pStb);
     terrno = TSDB_CODE_OUT_OF_MEMORY;
-    mError("stb:%s, failed to get meta since %s", pInfo->tableFname, terrstr());
+    mError("stb:%s, failed to get meta since %s", tbFName, terrstr());
     return -1;
   }
 
-  memcpy(pMeta->tbFname, pStb->name, TSDB_TABLE_FNAME_LEN);
+  strcpy(pMeta->dbFName, pStb->db);
+  strcpy(pMeta->tbName, pInfo->tbName);
+  strcpy(pMeta->stbName, pInfo->tbName);
   pMeta->numOfTags = htonl(pStb->numOfTags);
   pMeta->numOfColumns = htonl(pStb->numOfColumns);
   pMeta->precision = pDb->cfg.precision;
@@ -835,10 +840,113 @@ static int32_t mndProcessStbMetaReq(SMnodeMsg *pReq) {
   pReq->pCont = pMeta;
   pReq->contLen = contLen;
 
-  mDebug("stb:%s, meta is retrieved, cols:%d tags:%d", pInfo->tableFname, pStb->numOfColumns, pStb->numOfTags);
+  mDebug("stb:%s, meta is retrieved, cols:%d tags:%d", tbFName, pStb->numOfColumns, pStb->numOfTags);
   return 0;
 }
 
+int32_t mndValidateStbInfo(SMnode *pMnode, SSTableMetaVersion *stbs, int32_t num, void **rsp, int32_t *rspLen) {
+  SSdb *pSdb = pMnode->pSdb;
+  int32_t bufSize = num * (sizeof(STableMetaRsp) + 4 * sizeof(SSchema));  
+  void *buf = malloc(bufSize);
+  int32_t len = 0;
+  int32_t contLen = 0;
+  STableMetaRsp *pRsp = NULL;
+
+  for (int32_t i = 0; i < num; ++i) {
+    SSTableMetaVersion *stb = &stbs[i];
+    stb->suid = be64toh(stb->suid);
+    stb->sversion = ntohs(stb->sversion);
+    stb->tversion = ntohs(stb->tversion);
+
+    if ((contLen + sizeof(STableMetaRsp)) > bufSize) {
+      bufSize = contLen + (num -i) * (sizeof(STableMetaRsp) + 4 * sizeof(SSchema));
+      buf = realloc(buf, bufSize);
+    }
+
+    pRsp = (STableMetaRsp *)((char *)buf + contLen);
+
+    strcpy(pRsp->dbFName, stb->dbFName);
+    strcpy(pRsp->tbName, stb->stbName);
+    strcpy(pRsp->stbName, stb->stbName);
+    
+    mDebug("start to retrieve meta, db:%s, stb:%s", stb->dbFName, stb->stbName);
+    
+    SDbObj *pDb = mndAcquireDb(pMnode, stb->dbFName);
+    if (pDb == NULL) {
+      pRsp->numOfColumns = -1;
+      pRsp->suid = htobe64(stb->suid);
+      contLen += sizeof(STableMetaRsp);
+      mWarn("db:%s, failed to require db since %s", stb->dbFName, terrstr());
+      continue;
+    }
+
+    char tbFName[TSDB_TABLE_FNAME_LEN] = {0};
+    snprintf(tbFName, sizeof(tbFName), "%s.%s", stb->dbFName, stb->stbName);
+    
+    SStbObj *pStb = mndAcquireStb(pMnode, tbFName);
+    if (pStb == NULL) {
+      mndReleaseDb(pMnode, pDb);
+      pRsp->numOfColumns = -1;
+      pRsp->suid = htobe64(stb->suid);
+      contLen += sizeof(STableMetaRsp);
+      mWarn("stb:%s, failed to get meta since %s", tbFName, terrstr());
+      continue;
+    }
+    
+    taosRLockLatch(&pStb->lock);
+
+    if (stb->suid == pStb->uid && stb->sversion == pStb->version) {
+      taosRUnLockLatch(&pStb->lock);
+      mndReleaseDb(pMnode, pDb);
+      mndReleaseStb(pMnode, pStb);
+      continue;
+    }
+    
+    int32_t totalCols = pStb->numOfColumns + pStb->numOfTags;
+    int32_t len = totalCols * sizeof(SSchema);
+    
+    contLen += sizeof(STableMetaRsp) + len;
+    
+    if (contLen > bufSize) {
+      bufSize = contLen + (num -i - 1) * (sizeof(STableMetaRsp) + 4 * sizeof(SSchema));
+      buf = realloc(buf, bufSize);
+    }
+    
+    pRsp->numOfTags = htonl(pStb->numOfTags);
+    pRsp->numOfColumns = htonl(pStb->numOfColumns);
+    pRsp->precision = pDb->cfg.precision;
+    pRsp->tableType = TSDB_SUPER_TABLE;
+    pRsp->update = pDb->cfg.update;
+    pRsp->sversion = htonl(pStb->version);
+    pRsp->suid = htobe64(pStb->uid);
+    pRsp->tuid = htobe64(pStb->uid);
+    
+    for (int32_t i = 0; i < totalCols; ++i) {
+      SSchema *pSchema = &pRsp->pSchema[i];
+      SSchema *pSrcSchema = &pStb->pSchema[i];
+      memcpy(pSchema->name, pSrcSchema->name, TSDB_COL_NAME_LEN);
+      pSchema->type = pSrcSchema->type;
+      pSchema->colId = htonl(pSrcSchema->colId);
+      pSchema->bytes = htonl(pSrcSchema->bytes);
+    }
+    taosRUnLockLatch(&pStb->lock);
+    mndReleaseDb(pMnode, pDb);
+    mndReleaseStb(pMnode, pStb);
+  }
+
+  if (contLen > 0) {
+    *rsp = buf;
+    *rspLen = contLen;
+  } else {
+    *rsp = NULL;
+    tfree(buf);
+    *rspLen = 0;
+  }
+
+  return 0;
+}
+
+
 static int32_t mndGetNumOfStbs(SMnode *pMnode, char *dbName, int32_t *pNumOfStbs) {
   SSdb *pSdb = pMnode->pSdb;
 
@@ -911,7 +1019,7 @@ static int32_t mndGetStbMeta(SMnodeMsg *pReq, SShowObj *pShow, STableMetaRsp *pM
 
   pShow->numOfRows = sdbGetSize(pSdb, SDB_STB);
   pShow->rowSize = pShow->offset[cols - 1] + pShow->bytes[cols - 1];
-  strcpy(pMeta->tbFname, mndShowStr(pShow->type));
+  strcpy(pMeta->tbName, mndShowStr(pShow->type));
 
   return 0;
 }
diff --git a/source/dnode/mnode/impl/src/mndSubscribe.c b/source/dnode/mnode/impl/src/mndSubscribe.c
index 938a3eb89e61946447341855364e94f7e066715e..9352c0cd84af6faaa053f8f628625302a3b13b65 100644
--- a/source/dnode/mnode/impl/src/mndSubscribe.c
+++ b/source/dnode/mnode/impl/src/mndSubscribe.c
@@ -745,7 +745,7 @@ static int32_t mndProcessConsumerMetaMsg(SMnodeMsg *pMsg) {
   SMnode        *pMnode = pMsg->pMnode;
   STableInfoReq *pInfo = pMsg->rpcMsg.pCont;
 
-  mDebug("subscribe:%s, start to retrieve meta", pInfo->tableFname);
+  mDebug("subscribe:%s, start to retrieve meta", pInfo->tbName);
 
 #if 0
   SDbObj *pDb = mndAcquireDbByConsumer(pMnode, pInfo->tableFname);
@@ -876,7 +876,7 @@ static int32_t mndGetConsumerMeta(SMnodeMsg *pMsg, SShowObj *pShow, STableMetaRs
 
   pShow->numOfRows = sdbGetSize(pSdb, SDB_CONSUMER);
   pShow->rowSize = pShow->offset[cols - 1] + pShow->bytes[cols - 1];
-  strcpy(pMeta->tbFname, mndShowStr(pShow->type));
+  strcpy(pMeta->tbName, mndShowStr(pShow->type));
 
   return 0;
 }
diff --git a/source/dnode/mnode/impl/src/mndTopic.c b/source/dnode/mnode/impl/src/mndTopic.c
index 33def69a68e64a7be788a04cc0a3c4a06177334a..ea3cc7c2c6452856cbc2a01406177a281eaf1db9 100644
--- a/source/dnode/mnode/impl/src/mndTopic.c
+++ b/source/dnode/mnode/impl/src/mndTopic.c
@@ -338,7 +338,7 @@ static int32_t mndProcessTopicMetaMsg(SMnodeMsg *pMsg) {
   SMnode        *pMnode = pMsg->pMnode;
   STableInfoReq *pInfo = pMsg->rpcMsg.pCont;
 
-  mDebug("topic:%s, start to retrieve meta", pInfo->tableFname);
+  mDebug("topic:%s, start to retrieve meta", pInfo->tbName);
 
 #if 0
   SDbObj *pDb = mndAcquireDbByTopic(pMnode, pInfo->tableFname);
@@ -469,7 +469,7 @@ static int32_t mndGetTopicMeta(SMnodeMsg *pMsg, SShowObj *pShow, STableMetaRsp *
 
   pShow->numOfRows = sdbGetSize(pSdb, SDB_TOPIC);
   pShow->rowSize = pShow->offset[cols - 1] + pShow->bytes[cols - 1];
-  strcpy(pMeta->tbFname, mndShowStr(pShow->type));
+  strcpy(pMeta->tbName, mndShowStr(pShow->type));
 
   return 0;
 }
diff --git a/source/dnode/mnode/impl/src/mndUser.c b/source/dnode/mnode/impl/src/mndUser.c
index c36e1288938add3dc3e2b668afc6035991356bf4..3040cd8a289c1a87ba2f6d65df1c919bf284f438 100644
--- a/source/dnode/mnode/impl/src/mndUser.c
+++ b/source/dnode/mnode/impl/src/mndUser.c
@@ -474,7 +474,7 @@ static int32_t mndGetUserMeta(SMnodeMsg *pReq, SShowObj *pShow, STableMetaRsp *p
 
   pShow->numOfRows = sdbGetSize(pSdb, SDB_USER);
   pShow->rowSize = pShow->offset[cols - 1] + pShow->bytes[cols - 1];
-  strcpy(pMeta->tbFname, mndShowStr(pShow->type));
+  strcpy(pMeta->tbName, mndShowStr(pShow->type));
 
   return 0;
 }
diff --git a/source/dnode/mnode/impl/src/mndVgroup.c b/source/dnode/mnode/impl/src/mndVgroup.c
index 01d39ebdc21d86fc1e5ec506a4d9ca20b2cbabd0..33aa4ce07ca7d8caa671e1512048baf1cda01aa5 100644
--- a/source/dnode/mnode/impl/src/mndVgroup.c
+++ b/source/dnode/mnode/impl/src/mndVgroup.c
@@ -525,7 +525,7 @@ static int32_t mndGetVgroupMeta(SMnodeMsg *pReq, SShowObj *pShow, STableMetaRsp
   }
 
   pShow->rowSize = pShow->offset[cols - 1] + pShow->bytes[cols - 1];
-  strcpy(pMeta->tbFname, mndShowStr(pShow->type));
+  strcpy(pMeta->tbName, mndShowStr(pShow->type));
 
   return 0;
 }
@@ -638,7 +638,7 @@ static int32_t mndGetVnodeMeta(SMnodeMsg *pReq, SShowObj *pShow, STableMetaRsp *
   pShow->replica = dnodeId;
   pShow->numOfRows = mndGetVnodesNum(pMnode, dnodeId);
   pShow->rowSize = pShow->offset[cols - 1] + pShow->bytes[cols - 1];
-  strcpy(pMeta->tbFname, mndShowStr(pShow->type));
+  strcpy(pMeta->tbName, mndShowStr(pShow->type));
 
   return 0;
 }
diff --git a/source/dnode/mnode/impl/test/show/show.cpp b/source/dnode/mnode/impl/test/show/show.cpp
index bfdc0f42b638fe1b2ead423d0c922b4c222c609d..bc31630ffe6b3dc84d5362c0269d613c8492e34f 100644
--- a/source/dnode/mnode/impl/test/show/show.cpp
+++ b/source/dnode/mnode/impl/test/show/show.cpp
@@ -64,7 +64,7 @@ TEST_F(MndTestShow, 03_ShowMsg_Conn) {
   test.SendShowMetaReq(TSDB_MGMT_TABLE_CONNS, "");
 
   STableMetaRsp* pMeta = test.GetShowMeta();
-  EXPECT_STREQ(pMeta->tbFname, "show connections");
+  EXPECT_STREQ(pMeta->tbName, "show connections");
   EXPECT_EQ(pMeta->numOfTags, 0);
   EXPECT_EQ(pMeta->numOfColumns, 7);
   EXPECT_EQ(pMeta->precision, 0);
diff --git a/source/dnode/mnode/impl/test/stb/stb.cpp b/source/dnode/mnode/impl/test/stb/stb.cpp
index beb52d68c1349a2a987805ddf2a87e8fa1eac4ea..a0e246033420aba31808e95de6b8b7c3b866a7d6 100644
--- a/source/dnode/mnode/impl/test/stb/stb.cpp
+++ b/source/dnode/mnode/impl/test/stb/stb.cpp
@@ -126,7 +126,8 @@ TEST_F(MndTestStb, 01_Create_Show_Meta_Drop_Restart_Stb) {
     int32_t contLen = sizeof(STableInfoReq);
 
     STableInfoReq* pReq = (STableInfoReq*)rpcMallocCont(contLen);
-    strcpy(pReq->tableFname, "1.d1.stb");
+    strcpy(pReq->dbFName, "1.d1");
+    strcpy(pReq->tbName, "stb");
 
     SRpcMsg* pMsg = test.SendReq(TDMT_MND_STB_META, pReq, contLen);
     ASSERT_NE(pMsg, nullptr);
@@ -146,8 +147,9 @@ TEST_F(MndTestStb, 01_Create_Show_Meta_Drop_Restart_Stb) {
       pSchema->bytes = htonl(pSchema->bytes);
     }
 
-    EXPECT_STREQ(pRsp->tbFname, "1.d1.stb");
-    EXPECT_STREQ(pRsp->stbFname, "");
+    EXPECT_STREQ(pRsp->dbFName, "1.d1");
+    EXPECT_STREQ(pRsp->tbName, "stb");
+    EXPECT_STREQ(pRsp->stbName, "stb");
     EXPECT_EQ(pRsp->numOfColumns, 2);
     EXPECT_EQ(pRsp->numOfTags, 3);
     EXPECT_EQ(pRsp->precision, TSDB_TIME_PRECISION_MILLI);
diff --git a/source/dnode/vnode/src/vnd/vnodeQuery.c b/source/dnode/vnode/src/vnd/vnodeQuery.c
index 21f5d027add0740491799d9e6fedc8d6e51a3a3f..a45a9d5a7231310dae3b09fb7aafe65dc553a17f 100644
--- a/source/dnode/vnode/src/vnd/vnodeQuery.c
+++ b/source/dnode/vnode/src/vnd/vnodeQuery.c
@@ -84,7 +84,7 @@ static int vnodeGetTableMeta(SVnode *pVnode, SRpcMsg *pMsg) {
   int             msgLen = 0;
   int32_t         code = TSDB_CODE_VND_APP_ERROR;
 
-  pTbCfg = metaGetTbInfoByName(pVnode->pMeta, pReq->tableFname, &uid);
+  pTbCfg = metaGetTbInfoByName(pVnode->pMeta, pReq->tbName, &uid);
   if (pTbCfg == NULL) {
     code = TSDB_CODE_VND_TB_NOT_EXIST;
     goto _exit;
@@ -119,13 +119,13 @@ static int vnodeGetTableMeta(SVnode *pVnode, SRpcMsg *pMsg) {
     goto _exit;
   }
 
-  memcpy(pTbMetaMsg->dbFname, pReq->dbFname, sizeof(pTbMetaMsg->dbFname));
-  strcpy(pTbMetaMsg->tbFname, pTbCfg->name);
+  memcpy(pTbMetaMsg->dbFName, pReq->dbFName, sizeof(pTbMetaMsg->dbFName));
+  strcpy(pTbMetaMsg->tbName, pReq->tbName);
   if (pTbCfg->type == META_CHILD_TABLE) {
-    strcpy(pTbMetaMsg->stbFname, pStbCfg->name);
+    strcpy(pTbMetaMsg->stbName, pStbCfg->name);
     pTbMetaMsg->suid = htobe64(pTbCfg->ctbCfg.suid);
   } else if (pTbCfg->type == META_SUPER_TABLE) {
-    strcpy(pTbMetaMsg->stbFname, pTbCfg->name);
+    strcpy(pTbMetaMsg->stbName, pTbCfg->name);
     pTbMetaMsg->suid = htobe64(uid);
   }
   pTbMetaMsg->numOfTags = htonl(nTagCols);
diff --git a/source/libs/catalog/inc/catalogInt.h b/source/libs/catalog/inc/catalogInt.h
index 7128e143bfed56fbc6a517cd813a6c0fbfa6f8ab..9c041d76c7049710f55a46240c639e41c600bfea 100644
--- a/source/libs/catalog/inc/catalogInt.h
+++ b/source/libs/catalog/inc/catalogInt.h
@@ -27,7 +27,7 @@ extern "C" {
 #define CTG_DEFAULT_CACHE_CLUSTER_NUMBER 6
 #define CTG_DEFAULT_CACHE_VGROUP_NUMBER 100
 #define CTG_DEFAULT_CACHE_DB_NUMBER 20
-#define CTG_DEFAULT_CACHE_TABLEMETA_NUMBER 100000
+#define CTG_DEFAULT_CACHE_TABLEMETA_NUMBER 10000
 #define CTG_DEFAULT_RENT_SECOND 10
 #define CTG_DEFAULT_RENT_SLOT_SIZE 10
 
@@ -47,55 +47,52 @@ enum {
   CTG_RENT_STABLE,
 };
 
-typedef struct SCTGDebug {
+typedef struct SCtgDebug {
   int32_t lockDebug;
-} SCTGDebug;
+} SCtgDebug;
 
 
-typedef struct SVgroupListCache {
-  int32_t vgroupVersion;
-  SHashObj *cache;        // key:vgId, value:SVgroupInfo
-} SVgroupListCache;
+typedef struct SCtgTbMetaCache {
+  SRWLatch  stbLock;
+  SHashObj *cache;           //key:tbname, value:STableMeta
+  SHashObj *stbCache;        //key:suid, value:STableMeta*
+} SCtgTbMetaCache;
 
-typedef struct SDBVgroupCache {
-  SHashObj *cache;      //key:dbname, value:SDBVgroupInfo
-} SDBVgroupCache;
+typedef struct SCtgDBCache {
+  SRWLatch         vgLock;
+  int8_t           deleted;
+  SDBVgroupInfo   *vgInfo;  
+  SCtgTbMetaCache  tbCache;
+} SCtgDBCache;
 
-typedef struct STableMetaCache {
-  SRWLatch  stableLock;
-  SHashObj *cache;           //key:fulltablename, value:STableMeta
-  SHashObj *stableCache;     //key:suid, value:STableMeta*
-} STableMetaCache;
-
-typedef struct SRentSlotInfo {
+typedef struct SCtgRentSlot {
   SRWLatch lock;
   bool     needSort;
   SArray  *meta;  // element is SDbVgVersion or SSTableMetaVersion
-} SRentSlotInfo;
+} SCtgRentSlot;
 
-typedef struct SMetaRentMgmt {
+typedef struct SCtgRentMgmt {
   int8_t         type;
   uint16_t       slotNum;
   uint16_t       slotRIdx;
   int64_t        lastReadMsec;
-  SRentSlotInfo *slots;
-} SMetaRentMgmt;
+  SCtgRentSlot  *slots;
+} SCtgRentMgmt;
 
 typedef struct SCatalog {
-  uint64_t         clusterId;
-  SDBVgroupCache   dbCache;
-  STableMetaCache  tableCache;
-  SMetaRentMgmt    dbRent;
-  SMetaRentMgmt    stableRent;
+  uint64_t         clusterId;  
+  SHashObj        *dbCache;      //key:dbname, value:SCtgDBCache
+  SCtgRentMgmt     dbRent;
+  SCtgRentMgmt     stbRent;
 } SCatalog;
 
 typedef struct SCtgApiStat {
 
 } SCtgApiStat;
 
-typedef struct SCtgResourceStat {
+typedef struct SCtgRuntimeStat {
 
-} SCtgResourceStat;
+} SCtgRuntimeStat;
 
 typedef struct SCtgCacheStat {
 
@@ -103,7 +100,7 @@ typedef struct SCtgCacheStat {
 
 typedef struct SCatalogStat {
   SCtgApiStat      api;
-  SCtgResourceStat resource;
+  SCtgRuntimeStat  runtime;
   SCtgCacheStat    cache;
 } SCatalogStat;
 
diff --git a/source/libs/catalog/src/catalog.c b/source/libs/catalog/src/catalog.c
index 1b4d711aad2eccd98df8e32d1f2995279260df88..02773fe533d5c00a85bceefc8ffc315ee642a4f7 100644
--- a/source/libs/catalog/src/catalog.c
+++ b/source/libs/catalog/src/catalog.c
@@ -20,31 +20,106 @@
 
 SCatalogMgmt ctgMgmt = {0};
 
-SCTGDebug gCTGDebug = {0};
+SCtgDebug gCTGDebug = {0};
 
 
-int32_t ctgGetDBVgroupFromCache(struct SCatalog* pCatalog, const char *dbName, SDBVgroupInfo **dbInfo, bool *inCache) {
-  if (NULL == pCatalog->dbCache.cache) {
+void ctgFreeMetaRent(SCtgRentMgmt *mgmt) {
+  if (NULL == mgmt->slots) {
+    return;
+  }
+
+  for (int32_t i = 0; i < mgmt->slotNum; ++i) {
+    SCtgRentSlot *slot = &mgmt->slots[i];
+    if (slot->meta) {
+      taosArrayDestroy(slot->meta);
+      slot->meta = NULL;
+    }
+  }
+
+  tfree(mgmt->slots);
+}
+
+
+void ctgFreeTableMetaCache(SCtgTbMetaCache *table) {
+  CTG_LOCK(CTG_WRITE, &table->stbLock);
+  if (table->stbCache) {
+    taosHashCleanup(table->stbCache);
+    table->stbCache = NULL;
+  }
+  CTG_UNLOCK(CTG_WRITE, &table->stbLock);
+
+  if (table->cache) {
+    taosHashCleanup(table->cache);
+    table->cache = NULL;
+  }
+}
+
+void ctgFreeDbCache(SCtgDBCache *dbCache) {
+  if (NULL == dbCache) {
+    return;
+  }
+
+  atomic_store_8(&dbCache->deleted, 1);
+
+  SDBVgroupInfo *dbInfo = NULL;
+  if (dbCache->vgInfo) {
+    CTG_LOCK(CTG_WRITE, &dbCache->vgLock);
+
+    if (dbCache->vgInfo->vgHash) {
+      taosHashCleanup(dbCache->vgInfo->vgHash);
+      dbCache->vgInfo->vgHash = NULL;
+    }
+
+    tfree(dbCache->vgInfo);
+    CTG_UNLOCK(CTG_WRITE, &dbCache->vgLock);
+  }
+
+  ctgFreeTableMetaCache(&dbCache->tbCache);
+}
+
+
+void ctgFreeHandle(struct SCatalog* pCatalog) {
+  ctgFreeMetaRent(&pCatalog->dbRent);
+  ctgFreeMetaRent(&pCatalog->stbRent);
+  if (pCatalog->dbCache) {
+    void *pIter = taosHashIterate(pCatalog->dbCache, NULL);
+    while (pIter) {
+      SCtgDBCache *dbCache = pIter;
+
+      ctgFreeDbCache(dbCache);
+      
+      pIter = taosHashIterate(pCatalog->dbCache, pIter);
+    }  
+
+    taosHashCleanup(pCatalog->dbCache);
+  }
+  
+  free(pCatalog);
+}
+
+
+int32_t ctgGetDBVgroupFromCache(struct SCatalog* pCatalog, const char *dbName, SCtgDBCache **dbCache, bool *inCache) {
+  if (NULL == pCatalog->dbCache) {
     *inCache = false;
     ctgWarn("empty db cache, dbName:%s", dbName);
     return TSDB_CODE_SUCCESS;
   }
 
-  SDBVgroupInfo *info = NULL;
+  SCtgDBCache *cache = NULL;
 
   while (true) {
-    info = taosHashAcquire(pCatalog->dbCache.cache, dbName, strlen(dbName));
+    cache = taosHashAcquire(pCatalog->dbCache, dbName, strlen(dbName));
 
-    if (NULL == info) {
+    if (NULL == cache) {
       *inCache = false;
       ctgWarn("not in db vgroup cache, dbName:%s", dbName);
       return TSDB_CODE_SUCCESS;
     }
 
-    CTG_LOCK(CTG_READ, &info->lock);
-    if (NULL == info->vgInfo) {
-      CTG_UNLOCK(CTG_READ, &info->lock);
-      taosHashRelease(pCatalog->dbCache.cache, info);
+    CTG_LOCK(CTG_READ, &cache->vgLock);
+    if (NULL == cache->vgInfo) {
+      CTG_UNLOCK(CTG_READ, &cache->vgLock);
+      taosHashRelease(pCatalog->dbCache, cache);
       ctgWarn("db cache vgInfo is NULL, dbName:%s", dbName);
       
       continue;
@@ -53,7 +128,7 @@ int32_t ctgGetDBVgroupFromCache(struct SCatalog* pCatalog, const char *dbName, S
     break;
   }
 
-  *dbInfo = info;
+  *dbCache = cache;
   *inCache = true;
 
   ctgDebug("Got db vgroup from cache, dbName:%s", dbName);
@@ -98,48 +173,73 @@ int32_t ctgGetDBVgroupFromMnode(struct SCatalog* pCatalog, void *pRpc, const SEp
   return TSDB_CODE_SUCCESS;
 }
 
-int32_t ctgIsTableMetaExistInCache(struct SCatalog* pCatalog, const char* tbFullName, int32_t *exist) {
-  if (NULL == pCatalog->tableCache.cache) {
+int32_t ctgIsTableMetaExistInCache(struct SCatalog* pCatalog, char *dbFName, char* tbName, int32_t *exist) {
+  if (NULL == pCatalog->dbCache) {
     *exist = 0;
-    ctgWarn("empty tablemeta cache, tbName:%s", tbFullName);
+    ctgWarn("empty db cache, dbFName:%s, tbName:%s", dbFName, tbName);
     return TSDB_CODE_SUCCESS;
   }
 
-  size_t sz = 0;
-  STableMeta *tbMeta = taosHashGet(pCatalog->tableCache.cache, tbFullName, strlen(tbFullName));
+  SCtgDBCache *dbCache = taosHashAcquire(pCatalog->dbCache, dbFName, strlen(dbFName));
+  if (NULL == dbCache) {
+    *exist = 0;
+    ctgWarn("db not exist in cache, dbFName:%s", dbFName);
+    return TSDB_CODE_SUCCESS;
+  }
 
+
+  size_t sz = 0;
+  STableMeta *tbMeta = taosHashGet(dbCache->tbCache.cache, tbName, strlen(tbName));
   if (NULL == tbMeta) {
+    taosHashRelease(pCatalog->dbCache, dbCache);
+    
     *exist = 0;
-    ctgDebug("tablemeta not in cache, tbName:%s", tbFullName);
+    ctgDebug("tbmeta not in cache, dbFName:%s, tbName:%s", dbFName, tbName);
     return TSDB_CODE_SUCCESS;
   }
 
   *exist = 1;
+
+  taosHashRelease(pCatalog->dbCache, dbCache);
   
-  ctgDebug("tablemeta is in cache, tbName:%s", tbFullName);
+  ctgDebug("tbmeta is in cache, dbFName:%s, tbName:%s", dbFName, tbName);
   
   return TSDB_CODE_SUCCESS;
 }
 
 
 int32_t ctgGetTableMetaFromCache(struct SCatalog* pCatalog, const SName* pTableName, STableMeta** pTableMeta, int32_t *exist) {
-  if (NULL == pCatalog->tableCache.cache) {
+  if (NULL == pCatalog->dbCache) {
     *exist = 0;
-    ctgWarn("empty tablemeta cache, tbName:%s", pTableName->tname);
+    ctgWarn("empty tbmeta cache, tbName:%s", pTableName->tname);
     return TSDB_CODE_SUCCESS;
   }
 
-  char tbFullName[TSDB_TABLE_FNAME_LEN];
-  tNameExtractFullName(pTableName, tbFullName);
+  char db[TSDB_DB_FNAME_LEN] = {0};
+  tNameGetFullDbName(pTableName, db);
 
   *pTableMeta = NULL;
 
-  size_t sz = 0;
-  STableMeta *tbMeta = taosHashGetCloneExt(pCatalog->tableCache.cache, tbFullName, strlen(tbFullName), NULL, (void **)pTableMeta, &sz);
+  SCtgDBCache *dbCache = taosHashAcquire(pCatalog->dbCache, db, strlen(db));
+  if (NULL == dbCache) {
+    *exist = 0;
+    ctgWarn("no db cache, dbFName:%s, tbName:%s", db, pTableName->tname);
+    return TSDB_CODE_SUCCESS;
+  }
 
+  if (NULL == dbCache->tbCache.cache) {
+    *exist = 0;
+    taosHashRelease(pCatalog->dbCache, dbCache);
+    ctgWarn("empty tbmeta cache, dbFName:%s, tbName:%s", db, pTableName->tname);
+    return TSDB_CODE_SUCCESS;
+  }
+  
+  size_t sz = 0;
+  STableMeta *tbMeta = taosHashGetCloneExt(dbCache->tbCache.cache, pTableName->tname, strlen(pTableName->tname), NULL, (void **)pTableMeta, &sz);
   if (NULL == *pTableMeta) {
     *exist = 0;
-    ctgDebug("tablemeta not in cache, tbName:%s", tbFullName);
+    taosHashRelease(pCatalog->dbCache, dbCache);
+    ctgDebug("tbmeta not in cache, dbFName:%s, tbName:%s", db, pTableName->tname);
     return TSDB_CODE_SUCCESS;
   }
 
@@ -148,80 +248,91 @@ int32_t ctgGetTableMetaFromCache(struct SCatalog* pCatalog, const SName* pTableN
   tbMeta = *pTableMeta;
 
   if (tbMeta->tableType != TSDB_CHILD_TABLE) {
-    ctgDebug("Got tablemeta from cache, tbName:%s", tbFullName);
-
+    taosHashRelease(pCatalog->dbCache, dbCache);
+    ctgDebug("Got tbmeta from cache, type:%d, dbFName:%s, tbName:%s", tbMeta->tableType, db, pTableName->tname);
     return TSDB_CODE_SUCCESS;
   }
   
-  CTG_LOCK(CTG_READ, &pCatalog->tableCache.stableLock);
+  CTG_LOCK(CTG_READ, &dbCache->tbCache.stbLock);
   
-  STableMeta **stbMeta = taosHashGet(pCatalog->tableCache.stableCache, &tbMeta->suid, sizeof(tbMeta->suid));
+  STableMeta **stbMeta = taosHashGet(dbCache->tbCache.stbCache, &tbMeta->suid, sizeof(tbMeta->suid));
   if (NULL == stbMeta || NULL == *stbMeta) {
-    CTG_UNLOCK(CTG_READ, &pCatalog->tableCache.stableLock);
-    ctgError("stable not in stableCache, suid:%"PRIx64, tbMeta->suid);
+    CTG_UNLOCK(CTG_READ, &dbCache->tbCache.stbLock);
+    taosHashRelease(pCatalog->dbCache, dbCache);
+    ctgError("stable not in stbCache, suid:%"PRIx64, tbMeta->suid);
     tfree(*pTableMeta);
     *exist = 0;
     return TSDB_CODE_SUCCESS;
   }
 
   if ((*stbMeta)->suid != tbMeta->suid) {    
-    CTG_UNLOCK(CTG_READ, &pCatalog->tableCache.stableLock);
+    CTG_UNLOCK(CTG_READ, &dbCache->tbCache.stbLock);
+    taosHashRelease(pCatalog->dbCache, dbCache);
     tfree(*pTableMeta);
-    ctgError("stable suid in stableCache mis-match, expected suid:%"PRIx64 ",actual suid:%"PRIx64, tbMeta->suid, (*stbMeta)->suid);
+    ctgError("stable suid in stbCache mis-match, expected suid:%"PRIx64 ",actual suid:%"PRIx64, tbMeta->suid, (*stbMeta)->suid);
     CTG_ERR_RET(TSDB_CODE_CTG_INTERNAL_ERROR);
   }
 
   int32_t metaSize = sizeof(STableMeta) + ((*stbMeta)->tableInfo.numOfTags + (*stbMeta)->tableInfo.numOfColumns) * sizeof(SSchema);
   *pTableMeta = realloc(*pTableMeta, metaSize);
   if (NULL == *pTableMeta) {    
-    CTG_UNLOCK(CTG_READ, &pCatalog->tableCache.stableLock);
+    CTG_UNLOCK(CTG_READ, &dbCache->tbCache.stbLock);
+    taosHashRelease(pCatalog->dbCache, dbCache);
     ctgError("realloc size[%d] failed", metaSize);
     CTG_ERR_RET(TSDB_CODE_CTG_MEM_ERROR);
   }
 
   memcpy(&(*pTableMeta)->sversion, &(*stbMeta)->sversion, metaSize - sizeof(SCTableMeta));
 
-  CTG_UNLOCK(CTG_READ, &pCatalog->tableCache.stableLock);
+  CTG_UNLOCK(CTG_READ, &dbCache->tbCache.stbLock);
+
+  taosHashRelease(pCatalog->dbCache, dbCache);
 
-  ctgDebug("Got tablemeta from cache, tbName:%s", tbFullName);
+  ctgDebug("Got tbmeta from cache, dbFName:%s, tbName:%s", db, pTableName->tname);
   
   return TSDB_CODE_SUCCESS;
 }
 
 int32_t ctgGetTableTypeFromCache(struct SCatalog* pCatalog, const SName* pTableName, int32_t *tbType) {
-  if (NULL == pCatalog->tableCache.cache) {
-    ctgWarn("empty tablemeta cache, tbName:%s", pTableName->tname);  
+  if (NULL == pCatalog->dbCache) {
+    ctgWarn("empty db cache, tbName:%s", pTableName->tname);  
     return TSDB_CODE_SUCCESS;
   }
 
-  char tbFullName[TSDB_TABLE_FNAME_LEN];
-  tNameExtractFullName(pTableName, tbFullName);
+  char dbName[TSDB_DB_FNAME_LEN] = {0};
+  tNameGetFullDbName(pTableName, dbName);
 
-  size_t sz = 0;
-  STableMeta *pTableMeta = NULL;
-  
-  taosHashGetCloneExt(pCatalog->tableCache.cache, tbFullName, strlen(tbFullName), NULL, (void **)&pTableMeta, &sz);
+  SCtgDBCache *dbCache = taosHashAcquire(pCatalog->dbCache, dbName, strlen(dbName));
+  if (NULL == dbCache) {
+    ctgInfo("db not in cache, dbFName:%s", dbName);
+    return TSDB_CODE_SUCCESS;
+  }
 
+  STableMeta *pTableMeta = (STableMeta *)taosHashAcquire(dbCache->tbCache.cache, pTableName->tname, strlen(pTableName->tname));
   if (NULL == pTableMeta) {
-    ctgWarn("tablemeta not in cache, tbName:%s", tbFullName);  
-  
+    ctgWarn("tbmeta not in cache, dbFName:%s, tbName:%s", dbName, pTableName->tname);  
+    taosHashRelease(pCatalog->dbCache, dbCache);
+    
     return TSDB_CODE_SUCCESS;
   }
 
-  *tbType = pTableMeta->tableType;
+  *tbType = atomic_load_8(&pTableMeta->tableType);
 
-  ctgDebug("Got tabletype from cache, tbName:%s, type:%d", tbFullName, *tbType);  
+  taosHashRelease(dbCache->tbCache.cache, dbCache);
+  taosHashRelease(pCatalog->dbCache, dbCache);
+
+  ctgDebug("Got tbtype from cache, dbFName:%s, tbName:%s, type:%d", dbName, pTableName->tname, *tbType);  
   
   return TSDB_CODE_SUCCESS;
 }
 
-int32_t ctgGetTableMetaFromMnodeImpl(struct SCatalog* pCatalog, void *pTransporter, const SEpSet* pMgmtEps, char* tbFullName, STableMetaOutput* output) {
-  SBuildTableMetaInput bInput = {.vgId = 0, .dbName = NULL, .tableFullName = tbFullName};
+int32_t ctgGetTableMetaFromMnodeImpl(struct SCatalog* pCatalog, void *pTransporter, const SEpSet* pMgmtEps, char *dbFName, char* tbName, STableMetaOutput* output) {
+  SBuildTableMetaInput bInput = {.vgId = 0, .dbFName = dbFName, .tbName = tbName};
   char *msg = NULL;
   SEpSet *pVnodeEpSet = NULL;
   int32_t msgLen = 0;
 
-  ctgDebug("try to get table meta from mnode, tbName:%s", tbFullName);
+  ctgDebug("try to get table meta from mnode, dbFName:%s, tbName:%s", dbFName, tbName);
 
   int32_t code = queryBuildMsg[TMSG_INDEX(TDMT_MND_STB_META)](&bInput, &msg, 0, &msgLen);
   if (code) {
@@ -242,30 +353,30 @@ int32_t ctgGetTableMetaFromMnodeImpl(struct SCatalog* pCatalog, void *pTransport
   if (TSDB_CODE_SUCCESS != rpcRsp.code) {
     if (CTG_TABLE_NOT_EXIST(rpcRsp.code)) {
       SET_META_TYPE_NULL(output->metaType);
-      ctgDebug("stablemeta not exist in mnode, tbName:%s", tbFullName);
+      ctgDebug("stablemeta not exist in mnode, dbFName:%s, tbName:%s", dbFName, tbName);
       return TSDB_CODE_SUCCESS;
     }
     
-    ctgError("error rsp for stablemeta from mnode, code:%s, tbName:%s", tstrerror(rpcRsp.code), tbFullName);
+    ctgError("error rsp for stablemeta from mnode, code:%s, dbFName:%s, tbName:%s", tstrerror(rpcRsp.code), dbFName, tbName);
     CTG_ERR_RET(rpcRsp.code);
   }
 
   code = queryProcessMsgRsp[TMSG_INDEX(TDMT_MND_STB_META)](output, rpcRsp.pCont, rpcRsp.contLen);
   if (code) {
-    ctgError("Process mnode stablemeta rsp failed, code:%x, tbName:%s", code, tbFullName);
+    ctgError("Process mnode stablemeta rsp failed, code:%x, dbFName:%s, tbName:%s", code, dbFName, tbName);
     CTG_ERR_RET(code);
   }
 
-  ctgDebug("Got table meta from mnode, tbName:%s", tbFullName);
+  ctgDebug("Got table meta from mnode, dbFName:%s, tbName:%s", dbFName, tbName);
 
   return TSDB_CODE_SUCCESS;
 }
 
 int32_t ctgGetTableMetaFromMnode(struct SCatalog* pCatalog, void *pTransporter, const SEpSet* pMgmtEps, const SName* pTableName, STableMetaOutput* output) {
-  char tbFullName[TSDB_TABLE_FNAME_LEN];
-  tNameExtractFullName(pTableName, tbFullName);
+  char dbFName[TSDB_DB_FNAME_LEN];
+  tNameGetFullDbName(pTableName, dbFName);
 
-  return ctgGetTableMetaFromMnodeImpl(pCatalog, pTransporter, pMgmtEps, tbFullName, output);
+  return ctgGetTableMetaFromMnodeImpl(pCatalog, pTransporter, pMgmtEps, dbFName, (char *)pTableName->tname, output);
 }
 
 int32_t ctgGetTableMetaFromVnode(struct SCatalog* pCatalog, void *pTransporter, const SEpSet* pMgmtEps, const SName* pTableName, SVgroupInfo *vgroupInfo, STableMetaOutput* output) {
@@ -273,18 +384,18 @@ int32_t ctgGetTableMetaFromVnode(struct SCatalog* pCatalog, void *pTransporter,
     CTG_ERR_RET(TSDB_CODE_CTG_INVALID_INPUT);
   }
 
-  char dbFullName[TSDB_DB_FNAME_LEN];
-  tNameGetFullDbName(pTableName, dbFullName);
+  char dbFName[TSDB_DB_FNAME_LEN];
+  tNameGetFullDbName(pTableName, dbFName);
 
-  ctgDebug("try to get table meta from vnode, db:%s, tbName:%s", dbFullName, tNameGetTableName(pTableName));
+  ctgDebug("try to get table meta from vnode, dbFName:%s, tbName:%s", dbFName, tNameGetTableName(pTableName));
 
-  SBuildTableMetaInput bInput = {.vgId = vgroupInfo->vgId, .dbName = dbFullName, .tableFullName = (char *)tNameGetTableName(pTableName)};
+  SBuildTableMetaInput bInput = {.vgId = vgroupInfo->vgId, .dbFName = dbFName, .tbName = (char *)tNameGetTableName(pTableName)};
   char *msg = NULL;
   int32_t msgLen = 0;
 
   int32_t code = queryBuildMsg[TMSG_INDEX(TDMT_VND_TABLE_META)](&bInput, &msg, 0, &msgLen);
   if (code) {
-    ctgError("Build vnode tablemeta msg failed, code:%x, tbName:%s", code, tNameGetTableName(pTableName));
+    ctgError("Build vnode tablemeta msg failed, code:%x, dbFName:%s, tbName:%s", code, dbFName, tNameGetTableName(pTableName));
     CTG_ERR_RET(code);
   }
 
@@ -300,21 +411,21 @@ int32_t ctgGetTableMetaFromVnode(struct SCatalog* pCatalog, void *pTransporter,
   if (TSDB_CODE_SUCCESS != rpcRsp.code) {
     if (CTG_TABLE_NOT_EXIST(rpcRsp.code)) {
       SET_META_TYPE_NULL(output->metaType);
-      ctgDebug("tablemeta not exist in vnode, tbName:%s", tNameGetTableName(pTableName));
+      ctgDebug("tablemeta not exist in vnode, dbFName:%s, tbName:%s", dbFName, tNameGetTableName(pTableName));
       return TSDB_CODE_SUCCESS;
     }
   
-    ctgError("error rsp for table meta from vnode, code:%s, tbName:%s", tstrerror(rpcRsp.code), tNameGetTableName(pTableName));
+    ctgError("error rsp for table meta from vnode, code:%s, dbFName:%s, tbName:%s", tstrerror(rpcRsp.code), dbFName, tNameGetTableName(pTableName));
     CTG_ERR_RET(rpcRsp.code);
   }
 
   code = queryProcessMsgRsp[TMSG_INDEX(TDMT_VND_TABLE_META)](output, rpcRsp.pCont, rpcRsp.contLen);
   if (code) {
-    ctgError("Process vnode tablemeta rsp failed, code:%s, tbName:%s", tstrerror(code), tNameGetTableName(pTableName));
+    ctgError("Process vnode tablemeta rsp failed, code:%s, dbFName:%s, tbName:%s", tstrerror(code), dbFName, tNameGetTableName(pTableName));
     CTG_ERR_RET(code);
   }
 
-  ctgDebug("Got table meta from vnode, db:%s, tbName:%s", dbFullName, tNameGetTableName(pTableName));
+  ctgDebug("Got table meta from vnode, dbFName:%s, tbName:%s", dbFName, tNameGetTableName(pTableName));
   return TSDB_CODE_SUCCESS;
 }
 
@@ -334,7 +445,7 @@ int32_t ctgGetVgInfoFromDB(struct SCatalog *pCatalog, void *pRpc, const SEpSet *
   SVgroupInfo *vgInfo = NULL;
   SArray *vgList = NULL;
   int32_t code = 0;
-  int32_t vgNum = taosHashGetSize(dbInfo->vgInfo);
+  int32_t vgNum = taosHashGetSize(dbInfo->vgHash);
 
   vgList = taosArrayInit(vgNum, sizeof(SVgroupInfo));
   if (NULL == vgList) {
@@ -342,7 +453,7 @@ int32_t ctgGetVgInfoFromDB(struct SCatalog *pCatalog, void *pRpc, const SEpSet *
     CTG_ERR_RET(TSDB_CODE_CTG_MEM_ERROR);    
   }
 
-  void *pIter = taosHashIterate(dbInfo->vgInfo, NULL);
+  void *pIter = taosHashIterate(dbInfo->vgHash, NULL);
   while (pIter) {
     vgInfo = pIter;
 
@@ -351,7 +462,7 @@ int32_t ctgGetVgInfoFromDB(struct SCatalog *pCatalog, void *pRpc, const SEpSet *
       CTG_ERR_JRET(TSDB_CODE_CTG_MEM_ERROR);
     }
     
-    pIter = taosHashIterate(dbInfo->vgInfo, pIter);
+    pIter = taosHashIterate(dbInfo->vgHash, pIter);
     vgInfo = NULL;
   }
 
@@ -374,7 +485,7 @@ _return:
 int32_t ctgGetVgInfoFromHashValue(struct SCatalog *pCatalog, SDBVgroupInfo *dbInfo, const SName *pTableName, SVgroupInfo *pVgroup) {
   int32_t code = 0;
   
-  int32_t vgNum = taosHashGetSize(dbInfo->vgInfo);
+  int32_t vgNum = taosHashGetSize(dbInfo->vgHash);
   char db[TSDB_DB_FNAME_LEN] = {0};
   tNameGetFullDbName(pTableName, db);
 
@@ -386,40 +497,39 @@ int32_t ctgGetVgInfoFromHashValue(struct SCatalog *pCatalog, SDBVgroupInfo *dbIn
   tableNameHashFp fp = NULL;
   SVgroupInfo *vgInfo = NULL;
 
-  CTG_ERR_JRET(ctgGetHashFunction(dbInfo->hashMethod, &fp));
+  CTG_ERR_RET(ctgGetHashFunction(dbInfo->hashMethod, &fp));
 
   char tbFullName[TSDB_TABLE_FNAME_LEN];
   tNameExtractFullName(pTableName, tbFullName);
 
   uint32_t hashValue = (*fp)(tbFullName, (uint32_t)strlen(tbFullName));
 
-  void *pIter = taosHashIterate(dbInfo->vgInfo, NULL);
+  void *pIter = taosHashIterate(dbInfo->vgHash, NULL);
   while (pIter) {
     vgInfo = pIter;
     if (hashValue >= vgInfo->hashBegin && hashValue <= vgInfo->hashEnd) {
-      taosHashCancelIterate(dbInfo->vgInfo, pIter);
+      taosHashCancelIterate(dbInfo->vgHash, pIter);
       break;
     }
     
-    pIter = taosHashIterate(dbInfo->vgInfo, pIter);
+    pIter = taosHashIterate(dbInfo->vgHash, pIter);
     vgInfo = NULL;
   }
 
   if (NULL == vgInfo) {
-    ctgError("no hash range found for hash value [%u], db:%s, numOfVgId:%d", hashValue, db, taosHashGetSize(dbInfo->vgInfo));
-    CTG_ERR_JRET(TSDB_CODE_CTG_INTERNAL_ERROR);
+    ctgError("no hash range found for hash value [%u], db:%s, numOfVgId:%d", hashValue, db, taosHashGetSize(dbInfo->vgHash));
+    CTG_ERR_RET(TSDB_CODE_CTG_INTERNAL_ERROR);
   }
 
   *pVgroup = *vgInfo;
 
-_return:
   CTG_RET(code);
 }
 
 int32_t ctgSTableVersionCompare(const void* key1, const void* key2) {
-  if (((SSTableMetaVersion*)key1)->suid < ((SSTableMetaVersion*)key2)->suid) {
+  if (*(uint64_t *)key1 < ((SSTableMetaVersion*)key2)->suid) {
     return -1;
-  } else if (((SSTableMetaVersion*)key1)->suid > ((SSTableMetaVersion*)key2)->suid) {
+  } else if (*(uint64_t *)key1 > ((SSTableMetaVersion*)key2)->suid) {
     return 1;
   } else {
     return 0;
@@ -437,17 +547,17 @@ int32_t ctgDbVgVersionCompare(const void* key1, const void* key2) {
 }
 
 
-int32_t ctgMetaRentInit(SMetaRentMgmt *mgmt, uint32_t rentSec, int8_t type) {
+int32_t ctgMetaRentInit(SCtgRentMgmt *mgmt, uint32_t rentSec, int8_t type) {
   mgmt->slotRIdx = 0;
   mgmt->slotNum = rentSec / CTG_RENT_SLOT_SECOND;
   mgmt->type = type;
 
-  size_t msgSize = sizeof(SRentSlotInfo) * mgmt->slotNum;
+  size_t msgSize = sizeof(SCtgRentSlot) * mgmt->slotNum;
   
   mgmt->slots = calloc(1, msgSize);
   if (NULL == mgmt->slots) {
     qError("calloc %d failed", (int32_t)msgSize);
-    return TSDB_CODE_CTG_MEM_ERROR;
+    CTG_ERR_RET(TSDB_CODE_CTG_MEM_ERROR);
   }
 
   qDebug("meta rent initialized, type:%d, slotNum:%d", type, mgmt->slotNum);
@@ -456,10 +566,10 @@ int32_t ctgMetaRentInit(SMetaRentMgmt *mgmt, uint32_t rentSec, int8_t type) {
 }
 
 
-int32_t ctgMetaRentAdd(SMetaRentMgmt *mgmt, void *meta, int64_t id, int32_t size) {
+int32_t ctgMetaRentAdd(SCtgRentMgmt *mgmt, void *meta, int64_t id, int32_t size) {
   int16_t widx = abs(id % mgmt->slotNum);
 
-  SRentSlotInfo *slot = &mgmt->slots[widx];
+  SCtgRentSlot *slot = &mgmt->slots[widx];
   int32_t code = 0;
   
   CTG_LOCK(CTG_WRITE, &slot->lock);
@@ -486,10 +596,10 @@ _return:
   CTG_RET(code);
 }
 
-int32_t ctgMetaRentUpdate(SMetaRentMgmt *mgmt, void *meta, int64_t id, int32_t size, __compar_fn_t compare) {
+int32_t ctgMetaRentUpdate(SCtgRentMgmt *mgmt, void *meta, int64_t id, int32_t size, __compar_fn_t compare) {
   int16_t widx = abs(id % mgmt->slotNum);
 
-  SRentSlotInfo *slot = &mgmt->slots[widx];
+  SCtgRentSlot *slot = &mgmt->slots[widx];
   int32_t code = 0;
   
   CTG_LOCK(CTG_WRITE, &slot->lock);
@@ -526,10 +636,10 @@ _return:
   CTG_RET(code);
 }
 
-int32_t ctgMetaRentRemove(SMetaRentMgmt *mgmt, int64_t id, __compar_fn_t compare) {
+int32_t ctgMetaRentRemove(SCtgRentMgmt *mgmt, int64_t id, __compar_fn_t compare) {
   int16_t widx = abs(id % mgmt->slotNum);
 
-  SRentSlotInfo *slot = &mgmt->slots[widx];
+  SCtgRentSlot *slot = &mgmt->slots[widx];
   int32_t code = 0;
   
   CTG_LOCK(CTG_WRITE, &slot->lock);
@@ -562,14 +672,14 @@ _return:
 }
 
 
-int32_t ctgMetaRentGetImpl(SMetaRentMgmt *mgmt, void **res, uint32_t *num, int32_t size) {
+int32_t ctgMetaRentGetImpl(SCtgRentMgmt *mgmt, void **res, uint32_t *num, int32_t size) {
   int16_t ridx = atomic_add_fetch_16(&mgmt->slotRIdx, 1);
   if (ridx >= mgmt->slotNum) {
     ridx %= mgmt->slotNum;
     atomic_store_16(&mgmt->slotRIdx, ridx);
   }
 
-  SRentSlotInfo *slot = &mgmt->slots[ridx];
+  SCtgRentSlot *slot = &mgmt->slots[ridx];
   int32_t code = 0;
   
   CTG_LOCK(CTG_READ, &slot->lock);
@@ -608,7 +718,7 @@ _return:
   CTG_RET(code);
 }
 
-int32_t ctgMetaRentGet(SMetaRentMgmt *mgmt, void **res, uint32_t *num, int32_t size) {
+int32_t ctgMetaRentGet(SCtgRentMgmt *mgmt, void **res, uint32_t *num, int32_t size) {
   while (true) {
     int64_t msec = taosGetTimestampMs();
     int64_t lsec = atomic_load_64(&mgmt->lastReadMsec);
@@ -635,52 +745,79 @@ int32_t ctgMetaRentGet(SMetaRentMgmt *mgmt, void **res, uint32_t *num, int32_t s
 
 int32_t ctgUpdateTableMetaCache(struct SCatalog *pCatalog, STableMetaOutput *output) {
   int32_t code = 0;
+  SCtgDBCache *dbCache = NULL;
 
   if ((!CTG_IS_META_CTABLE(output->metaType)) && NULL == output->tbMeta) {
-    ctgError("no valid table meta got from meta rsp, tbName:%s", output->tbFname);
+    ctgError("no valid tbmeta got from meta rsp, dbFName:%s, tbName:%s", output->dbFName, output->tbName);
     CTG_ERR_RET(TSDB_CODE_CTG_INTERNAL_ERROR);
   }
 
-  if (NULL == pCatalog->tableCache.cache) {
+  if (NULL == pCatalog->dbCache) {
+    SHashObj *cache = taosHashInit(ctgMgmt.cfg.maxDBCacheNum, taosGetDefaultHashFunction(TSDB_DATA_TYPE_BINARY), true, HASH_ENTRY_LOCK);
+    if (NULL == cache) {
+      ctgError("taosHashInit %d failed", CTG_DEFAULT_CACHE_DB_NUMBER);
+      CTG_ERR_RET(TSDB_CODE_CTG_MEM_ERROR);
+    }
+
+    if (NULL != atomic_val_compare_exchange_ptr(&pCatalog->dbCache, NULL, cache)) {
+      taosHashCleanup(cache);
+    }
+  }
+
+  while (true) {
+    dbCache = (SCtgDBCache *)taosHashAcquire(pCatalog->dbCache, output->dbFName, strlen(output->dbFName));
+    if (dbCache) {
+      break;
+    }
+    
+    SCtgDBCache newDbCache = {0};
+
+    if (taosHashPut(pCatalog->dbCache, output->dbFName, strlen(output->dbFName), &newDbCache, sizeof(newDbCache))) {
+      ctgError("taosHashPut db to cache failed, db:%s", output->dbFName);
+      CTG_ERR_RET(TSDB_CODE_CTG_MEM_ERROR);
+    }
+  }
+
+  if (NULL == dbCache->tbCache.cache) {
     SHashObj *cache = taosHashInit(ctgMgmt.cfg.maxTblCacheNum, taosGetDefaultHashFunction(TSDB_DATA_TYPE_BINARY), true, HASH_ENTRY_LOCK);
     if (NULL == cache) {
       ctgError("taosHashInit failed, num:%d", ctgMgmt.cfg.maxTblCacheNum);
-      CTG_ERR_RET(TSDB_CODE_CTG_MEM_ERROR);
+      CTG_ERR_JRET(TSDB_CODE_CTG_MEM_ERROR);
     }
 
-    if (NULL != atomic_val_compare_exchange_ptr(&pCatalog->tableCache.cache, NULL, cache)) {
+    if (NULL != atomic_val_compare_exchange_ptr(&dbCache->tbCache.cache, NULL, cache)) {
       taosHashCleanup(cache);
     }
   }
 
-  if (NULL == pCatalog->tableCache.stableCache) {
+  if (NULL == dbCache->tbCache.stbCache) {
     SHashObj *cache = taosHashInit(ctgMgmt.cfg.maxTblCacheNum, taosGetDefaultHashFunction(TSDB_DATA_TYPE_UBIGINT), true, HASH_ENTRY_LOCK);
     if (NULL == cache) {
       ctgError("taosHashInit failed, num:%d", ctgMgmt.cfg.maxTblCacheNum);
-      CTG_ERR_RET(TSDB_CODE_CTG_MEM_ERROR);
+      CTG_ERR_JRET(TSDB_CODE_CTG_MEM_ERROR);
     }
 
-    if (NULL != atomic_val_compare_exchange_ptr(&pCatalog->tableCache.stableCache, NULL, cache)) {
+    if (NULL != atomic_val_compare_exchange_ptr(&dbCache->tbCache.stbCache, NULL, cache)) {
       taosHashCleanup(cache);
     }
   }
 
   if (CTG_IS_META_CTABLE(output->metaType) || CTG_IS_META_BOTH(output->metaType)) {
-    if (taosHashPut(pCatalog->tableCache.cache, output->ctbFname, strlen(output->ctbFname), &output->ctbMeta, sizeof(output->ctbMeta)) != 0) {
-      ctgError("taosHashPut ctablemeta to cache failed, ctbName:%s", output->ctbFname);
-      CTG_ERR_RET(TSDB_CODE_CTG_MEM_ERROR);
+    if (taosHashPut(dbCache->tbCache.cache, output->ctbName, strlen(output->ctbName), &output->ctbMeta, sizeof(output->ctbMeta)) != 0) {
+      ctgError("taosHashPut ctbmeta to cache failed, ctbName:%s", output->ctbName);
+      CTG_ERR_JRET(TSDB_CODE_CTG_MEM_ERROR);
     }
 
-    ctgDebug("update child tablemeta to cache, tbName:%s", output->ctbFname);
+    ctgDebug("ctbmeta updated to cache, ctbName:%s", output->ctbName);
   }
 
   if (CTG_IS_META_CTABLE(output->metaType)) {
-    return TSDB_CODE_SUCCESS;
+    goto _return;
   }
   
   if (CTG_IS_META_BOTH(output->metaType) && TSDB_SUPER_TABLE != output->tbMeta->tableType) {
     ctgError("table type error, expected:%d, actual:%d", TSDB_SUPER_TABLE, output->tbMeta->tableType);
-    CTG_ERR_RET(TSDB_CODE_CTG_INTERNAL_ERROR);
+    CTG_ERR_JRET(TSDB_CODE_CTG_INTERNAL_ERROR);
   }    
 
   int32_t tbSize = sizeof(*output->tbMeta) + sizeof(SSchema) * (output->tbMeta->tableInfo.numOfColumns + output->tbMeta->tableInfo.numOfTags);
@@ -688,45 +825,53 @@ int32_t ctgUpdateTableMetaCache(struct SCatalog *pCatalog, STableMetaOutput *out
   if (TSDB_SUPER_TABLE == output->tbMeta->tableType) {
     bool newAdded = false;
     SSTableMetaVersion metaRent = {.suid = output->tbMeta->suid, .sversion = output->tbMeta->sversion, .tversion = output->tbMeta->tversion};
+    strcpy(metaRent.dbFName, output->dbFName);
+    strcpy(metaRent.stbName, output->tbName);
     
-    CTG_LOCK(CTG_WRITE, &pCatalog->tableCache.stableLock);
-    if (taosHashPut(pCatalog->tableCache.cache, output->tbFname, strlen(output->tbFname), output->tbMeta, tbSize) != 0) {
-      CTG_UNLOCK(CTG_WRITE, &pCatalog->tableCache.stableLock);
-      ctgError("taosHashPut tablemeta to cache failed, tbName:%s", output->tbFname);
-      CTG_ERR_RET(TSDB_CODE_CTG_MEM_ERROR);
+    CTG_LOCK(CTG_WRITE, &dbCache->tbCache.stbLock);
+    if (taosHashPut(dbCache->tbCache.cache, output->tbName, strlen(output->tbName), output->tbMeta, tbSize) != 0) {
+      CTG_UNLOCK(CTG_WRITE, &dbCache->tbCache.stbLock);
+      ctgError("taosHashPut tablemeta to cache failed, dbFName:%s, tbName:%s", output->dbFName, output->tbName);
+      CTG_ERR_JRET(TSDB_CODE_CTG_MEM_ERROR);
     }
 
-    STableMeta *tbMeta = taosHashGet(pCatalog->tableCache.cache, output->tbFname, strlen(output->tbFname));
-    if (taosHashPutExt(pCatalog->tableCache.stableCache, &output->tbMeta->suid, sizeof(output->tbMeta->suid), &tbMeta, POINTER_BYTES, &newAdded) != 0) {
-      CTG_UNLOCK(CTG_WRITE, &pCatalog->tableCache.stableLock);
+    STableMeta *tbMeta = taosHashGet(dbCache->tbCache.cache, output->tbName, strlen(output->tbName));
+    if (taosHashPutExt(dbCache->tbCache.stbCache, &output->tbMeta->suid, sizeof(output->tbMeta->suid), &tbMeta, POINTER_BYTES, &newAdded) != 0) {
+      CTG_UNLOCK(CTG_WRITE, &dbCache->tbCache.stbLock);
       ctgError("taosHashPutExt stable to stable cache failed, suid:%"PRIx64, output->tbMeta->suid);
-      CTG_ERR_RET(TSDB_CODE_CTG_MEM_ERROR);
+      CTG_ERR_JRET(TSDB_CODE_CTG_MEM_ERROR);
     }
-    CTG_UNLOCK(CTG_WRITE, &pCatalog->tableCache.stableLock);
+    CTG_UNLOCK(CTG_WRITE, &dbCache->tbCache.stbLock);
 
     ctgDebug("update stable to cache, suid:%"PRIx64, output->tbMeta->suid);
 
     if (newAdded) {
-      CTG_ERR_RET(ctgMetaRentAdd(&pCatalog->stableRent, &metaRent, metaRent.suid, sizeof(SSTableMetaVersion)));
+      CTG_ERR_JRET(ctgMetaRentAdd(&pCatalog->stbRent, &metaRent, metaRent.suid, sizeof(SSTableMetaVersion)));
     } else {
-      CTG_ERR_RET(ctgMetaRentUpdate(&pCatalog->stableRent, &metaRent, metaRent.suid, sizeof(SSTableMetaVersion), ctgSTableVersionCompare));
+      CTG_ERR_JRET(ctgMetaRentUpdate(&pCatalog->stbRent, &metaRent, metaRent.suid, sizeof(SSTableMetaVersion), ctgSTableVersionCompare));
     }
   } else {
-    if (taosHashPut(pCatalog->tableCache.cache, output->tbFname, strlen(output->tbFname), output->tbMeta, tbSize) != 0) {
-      ctgError("taosHashPut tablemeta to cache failed, tbName:%s", output->tbFname);
-      CTG_ERR_RET(TSDB_CODE_CTG_MEM_ERROR);
+    if (taosHashPut(dbCache->tbCache.cache, output->tbName, strlen(output->tbName), output->tbMeta, tbSize) != 0) {
+      ctgError("taosHashPut tablemeta to cache failed, dbFName:%s, tbName:%s", output->dbFName, output->tbName);
+      CTG_ERR_JRET(TSDB_CODE_CTG_MEM_ERROR);
     }
   }
 
-  ctgDebug("update tablemeta to cache, tbName:%s", output->tbFname);
+  ctgDebug("update tablemeta to cache, dbFName:%s, tbName:%s", output->dbFName, output->tbName);
+
+_return:
+
+  if (dbCache) {
+    taosHashRelease(pCatalog->dbCache, dbCache);
+  }
 
   CTG_RET(code);
 }
 
-int32_t ctgGetDBVgroup(struct SCatalog* pCatalog, void *pRpc, const SEpSet* pMgmtEps, const char* dbName, bool forceUpdate, SDBVgroupInfo** dbInfo) {
+int32_t ctgGetDBVgroup(struct SCatalog* pCatalog, void *pRpc, const SEpSet* pMgmtEps, const char* dbName, bool forceUpdate, SCtgDBCache** dbCache) {
   bool inCache = false;
   if (!forceUpdate) {
-    CTG_ERR_RET(ctgGetDBVgroupFromCache(pCatalog, dbName, dbInfo, &inCache));
+    CTG_ERR_RET(ctgGetDBVgroupFromCache(pCatalog, dbName, dbCache, &inCache));
     if (inCache) {
       return TSDB_CODE_SUCCESS;
     }
@@ -742,8 +887,8 @@ int32_t ctgGetDBVgroup(struct SCatalog* pCatalog, void *pRpc, const SEpSet* pMgm
 
   while (true) {
     CTG_ERR_RET(ctgGetDBVgroupFromMnode(pCatalog, pRpc, pMgmtEps, &input, &DbOut));
-    CTG_ERR_RET(catalogUpdateDBVgroup(pCatalog, dbName, &DbOut.dbVgroup));
-    CTG_ERR_RET(ctgGetDBVgroupFromCache(pCatalog, dbName, dbInfo, &inCache));
+    CTG_ERR_RET(catalogUpdateDBVgroup(pCatalog, dbName, DbOut.dbVgroup));
+    CTG_ERR_RET(ctgGetDBVgroupFromCache(pCatalog, dbName, dbCache, &inCache));
 
     if (!inCache) {
       ctgWarn("can't get db vgroup from cache, will retry, db:%s", dbName);
@@ -757,66 +902,83 @@ int32_t ctgGetDBVgroup(struct SCatalog* pCatalog, void *pRpc, const SEpSet* pMgm
 }
 
 
-int32_t ctgValidateAndFreeDbInfo(struct SCatalog* pCatalog, const char* dbName, SDBVgroupInfo* dbInfo) {
-  SDBVgroupInfo *oldInfo = (SDBVgroupInfo *)taosHashAcquire(pCatalog->dbCache.cache, dbName, strlen(dbName));
-  if (oldInfo) {
-    CTG_LOCK(CTG_WRITE, &oldInfo->lock);
-    if (dbInfo->vgVersion <= oldInfo->vgVersion) {
-      ctgInfo("db vgVersion is not new, db:%s, vgVersion:%d, current:%d", dbName, dbInfo->vgVersion, oldInfo->vgVersion);
-      CTG_UNLOCK(CTG_WRITE, &oldInfo->lock);
-      taosHashRelease(pCatalog->dbCache.cache, oldInfo);
-      
-      return TSDB_CODE_SUCCESS;
-    }
-    
-    if (oldInfo->vgInfo) {
-      ctgInfo("cleanup db vgInfo, db:%s", dbName);
-      taosHashCleanup(oldInfo->vgInfo);
-      oldInfo->vgInfo = NULL;
-    }
-    
-    CTG_UNLOCK(CTG_WRITE, &oldInfo->lock);
+int32_t ctgValidateAndRemoveDb(struct SCatalog* pCatalog, const char* dbName, uint64_t dbId, bool *removed) {
+  *removed = false;
+
+  SCtgDBCache *dbCache = (SCtgDBCache *)taosHashAcquire(pCatalog->dbCache, dbName, strlen(dbName));
+  if (NULL == dbCache) {
+    ctgInfo("db not exist in dbCache, may be removed, db:%s", dbName);
+    return TSDB_CODE_SUCCESS;
+  }
+  
+  CTG_LOCK(CTG_WRITE, &dbCache->vgLock);
+  
+  if (NULL == dbCache->vgInfo) {
+    ctgInfo("db vgInfo not in dbCache, may be removed, db:%s, dbId:%"PRIx64, dbName, dbId);
+    CTG_UNLOCK(CTG_WRITE, &dbCache->vgLock);
+    taosHashRelease(pCatalog->dbCache, dbCache);
+    return TSDB_CODE_SUCCESS;
+  }
   
-    taosHashRelease(pCatalog->dbCache.cache, oldInfo);
+  if (dbCache->vgInfo->dbId != dbId) {
+    ctgInfo("db id already updated, db:%s, dbId:%"PRIx64 ", targetId:%"PRIx64, dbName, dbCache->vgInfo->dbId, dbId);
+    CTG_UNLOCK(CTG_WRITE, &dbCache->vgLock);
+    taosHashRelease(pCatalog->dbCache, dbCache);
+    return TSDB_CODE_SUCCESS;
+  }
+    
+  if (dbCache->vgInfo->vgHash) {
+    ctgInfo("cleanup db vgInfo, db:%s, dbId:%"PRIx64, dbName, dbId);
+    taosHashCleanup(dbCache->vgInfo->vgHash);
+    tfree(dbCache->vgInfo);
+  }
+
+  if (taosHashRemove(pCatalog->dbCache, dbName, strlen(dbName))) {
+    ctgError("taosHashRemove from dbCache failed, db:%s", dbName);
+    CTG_UNLOCK(CTG_WRITE, &dbCache->vgLock);      
+    taosHashRelease(pCatalog->dbCache, dbCache);
+    CTG_ERR_RET(TSDB_CODE_CTG_INTERNAL_ERROR);
   }
 
+  dbCache->deleted = true;
+  
+  CTG_UNLOCK(CTG_WRITE, &dbCache->vgLock);
+
+  ctgFreeTableMetaCache(&dbCache->tbCache);
+
+  taosHashRelease(pCatalog->dbCache, dbCache);
+
+  *removed = true;
+  
   return TSDB_CODE_SUCCESS;
 }
 
-int32_t ctgValidateAndRemoveDbInfo(struct SCatalog* pCatalog, SDbVgVersion* target, bool *removed) {
+int32_t ctgValidateAndRemoveStbMeta(struct SCatalog* pCatalog, const char* dbName, const char* stbName, uint64_t suid, bool *removed) {
   *removed = false;
 
-  SDBVgroupInfo *info = (SDBVgroupInfo *)taosHashAcquire(pCatalog->dbCache.cache, target->dbName, strlen(target->dbName));
-  if (NULL == info) {
-    ctgInfo("db not exist in dbCache, may be removed, db:%s", target->dbName);
+  SCtgDBCache *dbCache = (SCtgDBCache *)taosHashAcquire(pCatalog->dbCache, dbName, strlen(dbName));
+  if (NULL == dbCache) {
+    ctgInfo("db not exist in dbCache, may be removed, db:%s", dbName);
     return TSDB_CODE_SUCCESS;
   }
-  
-  CTG_LOCK(CTG_WRITE, &info->lock);
-  
-  if (info->dbId != target->dbId) {
-    ctgInfo("db id already updated, db:%s, dbId:%"PRIx64 ", targetId:%"PRIx64, target->dbName, info->dbId, target->dbId);
-    CTG_UNLOCK(CTG_WRITE, &info->lock);
-    taosHashRelease(pCatalog->dbCache.cache, info);
+
+  CTG_LOCK(CTG_WRITE, &dbCache->tbCache.stbLock);
+  if (taosHashRemove(dbCache->tbCache.stbCache, &suid, sizeof(suid))) {
+    CTG_UNLOCK(CTG_WRITE, &dbCache->tbCache.stbLock);
+    taosHashRelease(pCatalog->dbCache, dbCache);
+    ctgInfo("stb not exist in stbCache, may be removed, db:%s, stb:%s, suid:%"PRIx64, dbName, stbName, suid);
     return TSDB_CODE_SUCCESS;
   }
-    
-  if (info->vgInfo) {
-    ctgInfo("cleanup db vgInfo, db:%s", target->dbName);
-    taosHashCleanup(info->vgInfo);
-    info->vgInfo = NULL;
-  }
 
-  if (taosHashRemove(pCatalog->dbCache.cache, target->dbName, strlen(target->dbName))) {
-    ctgError("taosHashRemove from dbCache failed, db:%s", target->dbName);
-    CTG_UNLOCK(CTG_WRITE, &info->lock);      
-    taosHashRelease(pCatalog->dbCache.cache, info);
+  if (taosHashRemove(dbCache->tbCache.cache, stbName, strlen(stbName))) {
+    CTG_UNLOCK(CTG_WRITE, &dbCache->tbCache.stbLock);
+    taosHashRelease(pCatalog->dbCache, dbCache);
+    ctgError("stb not exist in cache, db:%s, stb:%s, suid:%"PRIx64, dbName, stbName, suid);
     CTG_ERR_RET(TSDB_CODE_CTG_INTERNAL_ERROR);
   }
+  CTG_UNLOCK(CTG_WRITE, &dbCache->tbCache.stbLock);
   
-  CTG_UNLOCK(CTG_WRITE, &info->lock);
-
-  taosHashRelease(pCatalog->dbCache.cache, info);
+  taosHashRelease(pCatalog->dbCache, dbCache);
 
   *removed = true;
   
@@ -824,6 +986,7 @@ int32_t ctgValidateAndRemoveDbInfo(struct SCatalog* pCatalog, SDbVgVersion* targ
 }
 
 
+
 int32_t ctgRenewTableMetaImpl(struct SCatalog* pCatalog, void *pTransporter, const SEpSet* pMgmtEps, const SName* pTableName, int32_t isSTable) {
   if (NULL == pCatalog || NULL == pTransporter || NULL == pMgmtEps || NULL == pTableName) {
     CTG_ERR_RET(TSDB_CODE_CTG_INVALID_INPUT);
@@ -839,7 +1002,7 @@ int32_t ctgRenewTableMetaImpl(struct SCatalog* pCatalog, void *pTransporter, con
   STableMetaOutput *output = &voutput;
 
   if (CTG_IS_STABLE(isSTable)) {
-    ctgDebug("will renew table meta, supposed to be stable, tbName:%s", tNameGetTableName(pTableName));
+    ctgDebug("will renew tbmeta, supposed to be stb, tbName:%s", tNameGetTableName(pTableName));
 
     // if get from mnode failed, will not try vnode
     CTG_ERR_JRET(ctgGetTableMetaFromMnode(pCatalog, pTransporter, pMgmtEps, pTableName, &moutput));
@@ -850,15 +1013,15 @@ int32_t ctgRenewTableMetaImpl(struct SCatalog* pCatalog, void *pTransporter, con
       output = &moutput;
     }
   } else {
-    ctgDebug("will renew table meta, not supposed to be stable, tbName:%s, isStable:%d", tNameGetTableName(pTableName), isSTable);
+    ctgDebug("will renew tbmeta, not supposed to be stb, tbName:%s, isStable:%d", tNameGetTableName(pTableName), isSTable);
 
     // if get from vnode failed or no table meta, will not try mnode
     CTG_ERR_JRET(ctgGetTableMetaFromVnode(pCatalog, pTransporter, pMgmtEps, pTableName, &vgroupInfo, &voutput));
 
     if (CTG_IS_META_TABLE(voutput.metaType) && TSDB_SUPER_TABLE == voutput.tbMeta->tableType) {
-      ctgDebug("will continue to renew table meta since got stable, tbName:%s, metaType:%d", tNameGetTableName(pTableName), voutput.metaType);
+      ctgDebug("will continue to renew tbmeta since got stb, tbName:%s, metaType:%d", tNameGetTableName(pTableName), voutput.metaType);
       
-      CTG_ERR_JRET(ctgGetTableMetaFromMnodeImpl(pCatalog, pTransporter, pMgmtEps, voutput.tbFname, &moutput));
+      CTG_ERR_JRET(ctgGetTableMetaFromMnodeImpl(pCatalog, pTransporter, pMgmtEps, voutput.dbFName, voutput.tbName, &moutput));
 
       voutput.metaType = moutput.metaType;
       
@@ -867,9 +1030,9 @@ int32_t ctgRenewTableMetaImpl(struct SCatalog* pCatalog, void *pTransporter, con
       moutput.tbMeta = NULL;
     } else if (CTG_IS_META_BOTH(voutput.metaType)) {
       int32_t exist = 0;
-      CTG_ERR_JRET(ctgIsTableMetaExistInCache(pCatalog, voutput.tbFname, &exist));
+      CTG_ERR_JRET(ctgIsTableMetaExistInCache(pCatalog, voutput.dbFName, voutput.tbName, &exist));
       if (0 == exist) {
-        CTG_ERR_JRET(ctgGetTableMetaFromMnodeImpl(pCatalog, pTransporter, pMgmtEps, voutput.tbFname, &moutput));
+        CTG_ERR_JRET(ctgGetTableMetaFromMnodeImpl(pCatalog, pTransporter, pMgmtEps, voutput.dbFName, voutput.tbName, &moutput));
 
         if (CTG_IS_META_NULL(moutput.metaType)) {
           SET_META_TYPE_NULL(voutput.metaType);
@@ -934,68 +1097,10 @@ int32_t ctgGetTableMeta(struct SCatalog* pCatalog, void *pRpc, const SEpSet* pMg
   return TSDB_CODE_SUCCESS;
 }
 
-void ctgFreeMetaRent(SMetaRentMgmt *mgmt) {
-  if (NULL == mgmt->slots) {
-    return;
-  }
-
-  for (int32_t i = 0; i < mgmt->slotNum; ++i) {
-    SRentSlotInfo *slot = &mgmt->slots[i];
-    if (slot->meta) {
-      taosArrayDestroy(slot->meta);
-      slot->meta = NULL;
-    }
-  }
-
-  tfree(mgmt->slots);
-}
-
-void ctgFreeDbCache(SDBVgroupCache *db) {
-  if (NULL == db->cache) {
-    return;
-  }
-
-  SDBVgroupInfo *dbInfo = NULL;
-  void *pIter = taosHashIterate(db->cache, NULL);
-  while (pIter) {
-    dbInfo = pIter;
-
-    if (dbInfo->vgInfo) {
-      taosHashCleanup(dbInfo->vgInfo);
-      dbInfo->vgInfo = NULL;
-    }
-    
-    pIter = taosHashIterate(db->cache, pIter);
-  }
-
-  taosHashCleanup(db->cache);
-  db->cache = NULL;
-}
-
-void ctgFreeTableMetaCache(STableMetaCache *table) {
-  if (table->stableCache) {
-    taosHashCleanup(table->stableCache);
-    table->stableCache = NULL;
-  }
-
-  if (table->cache) {
-    taosHashCleanup(table->cache);
-    table->cache = NULL;
-  }
-}
-
-void ctgFreeHandle(struct SCatalog* pCatalog) {
-  ctgFreeMetaRent(&pCatalog->dbRent);
-  ctgFreeMetaRent(&pCatalog->stableRent);
-  ctgFreeDbCache(&pCatalog->dbCache);
-  ctgFreeTableMetaCache(&pCatalog->tableCache);
-  
-  free(pCatalog);
-}
 
 int32_t catalogInit(SCatalogCfg *cfg) {
   if (ctgMgmt.pCluster) {
-    qError("catalog already init");
+    qError("catalog already initialized");
     CTG_ERR_RET(TSDB_CODE_CTG_INVALID_INPUT);
   }
 
@@ -1014,14 +1119,14 @@ int32_t catalogInit(SCatalogCfg *cfg) {
       ctgMgmt.cfg.dbRentSec = CTG_DEFAULT_RENT_SECOND;
     }
 
-    if (ctgMgmt.cfg.stableRentSec == 0) {
-      ctgMgmt.cfg.stableRentSec = CTG_DEFAULT_RENT_SECOND;
+    if (ctgMgmt.cfg.stbRentSec == 0) {
+      ctgMgmt.cfg.stbRentSec = CTG_DEFAULT_RENT_SECOND;
     }
   } else {
     ctgMgmt.cfg.maxDBCacheNum = CTG_DEFAULT_CACHE_DB_NUMBER;
     ctgMgmt.cfg.maxTblCacheNum = CTG_DEFAULT_CACHE_TABLEMETA_NUMBER;
     ctgMgmt.cfg.dbRentSec = CTG_DEFAULT_RENT_SECOND;
-    ctgMgmt.cfg.stableRentSec = CTG_DEFAULT_RENT_SECOND;
+    ctgMgmt.cfg.stbRentSec = CTG_DEFAULT_RENT_SECOND;
   }
 
   ctgMgmt.pCluster = taosHashInit(CTG_DEFAULT_CACHE_CLUSTER_NUMBER, taosGetDefaultHashFunction(TSDB_DATA_TYPE_BIGINT), false, HASH_ENTRY_LOCK);
@@ -1030,7 +1135,7 @@ int32_t catalogInit(SCatalogCfg *cfg) {
     CTG_ERR_RET(TSDB_CODE_CTG_INTERNAL_ERROR);
   }
 
-  qDebug("catalog initialized, maxDb:%u, maxTbl:%u, dbRentSec:%u, stableRentSec:%u", ctgMgmt.cfg.maxDBCacheNum, ctgMgmt.cfg.maxTblCacheNum, ctgMgmt.cfg.dbRentSec, ctgMgmt.cfg.stableRentSec);
+  qDebug("catalog initialized, maxDb:%u, maxTbl:%u, dbRentSec:%u, stbRentSec:%u", ctgMgmt.cfg.maxDBCacheNum, ctgMgmt.cfg.maxTblCacheNum, ctgMgmt.cfg.dbRentSec, ctgMgmt.cfg.stbRentSec);
 
   return TSDB_CODE_SUCCESS;
 }
@@ -1041,7 +1146,7 @@ int32_t catalogGetHandle(uint64_t clusterId, struct SCatalog** catalogHandle) {
   }
 
   if (NULL == ctgMgmt.pCluster) {
-    qError("cluster cache are not ready, clusterId:%"PRIx64, clusterId);
+    qError("catalog cluster cache are not ready, clusterId:%"PRIx64, clusterId);
     CTG_ERR_RET(TSDB_CODE_CTG_NOT_READY);
   }
 
@@ -1066,7 +1171,7 @@ int32_t catalogGetHandle(uint64_t clusterId, struct SCatalog** catalogHandle) {
     clusterCtg->clusterId = clusterId;
 
     CTG_ERR_JRET(ctgMetaRentInit(&clusterCtg->dbRent, ctgMgmt.cfg.dbRentSec, CTG_RENT_DB));
-    CTG_ERR_JRET(ctgMetaRentInit(&clusterCtg->stableRent, ctgMgmt.cfg.stableRentSec, CTG_RENT_STABLE));
+    CTG_ERR_JRET(ctgMetaRentInit(&clusterCtg->stbRent, ctgMgmt.cfg.stbRentSec, CTG_RENT_STABLE));
 
     code = taosHashPut(ctgMgmt.pCluster, &clusterId, sizeof(clusterId), &clusterCtg, POINTER_BYTES);
     if (code) {
@@ -1117,21 +1222,33 @@ int32_t catalogGetDBVgroupVersion(struct SCatalog* pCatalog, const char* dbName,
     CTG_ERR_RET(TSDB_CODE_CTG_INVALID_INPUT);
   }
 
-  if (NULL == pCatalog->dbCache.cache) {
+  if (NULL == pCatalog->dbCache) {
     *version = CTG_DEFAULT_INVALID_VERSION;
     ctgInfo("empty db cache, dbName:%s", dbName);
     return TSDB_CODE_SUCCESS;
   }
 
-  SDBVgroupInfo * dbInfo = taosHashAcquire(pCatalog->dbCache.cache, dbName, strlen(dbName));
-  if (NULL == dbInfo) {
+  SCtgDBCache *db = taosHashAcquire(pCatalog->dbCache, dbName, strlen(dbName));
+  if (NULL == db) {
     *version = CTG_DEFAULT_INVALID_VERSION;
     ctgInfo("db not in cache, dbName:%s", dbName);
     return TSDB_CODE_SUCCESS;
   }
 
-  *version = dbInfo->vgVersion;
-  taosHashRelease(pCatalog->dbCache.cache, dbInfo);
+  CTG_LOCK(CTG_READ, &db->vgLock);
+  
+  if (NULL == db->vgInfo) {
+    CTG_UNLOCK(CTG_READ, &db->vgLock);
+
+    *version = CTG_DEFAULT_INVALID_VERSION;
+    ctgInfo("db not in cache, dbName:%s", dbName);
+    return TSDB_CODE_SUCCESS;
+  }
+
+  *version = db->vgInfo->vgVersion;
+  CTG_UNLOCK(CTG_READ, &db->vgLock);
+  
+  taosHashRelease(pCatalog->dbCache, db);
 
   ctgDebug("Got db vgVersion from cache, dbName:%s, vgVersion:%d", dbName, *version);
 
@@ -1143,29 +1260,31 @@ int32_t catalogGetDBVgroup(struct SCatalog* pCatalog, void *pRpc, const SEpSet*
     CTG_ERR_RET(TSDB_CODE_CTG_INVALID_INPUT);
   }
 
-  SDBVgroupInfo* db   = NULL;
+  SCtgDBCache* dbCache   = NULL;
   SVgroupInfo *vgInfo = NULL;
 
   int32_t code = 0;
   SArray *vgList = NULL;
-  CTG_ERR_JRET(ctgGetDBVgroup(pCatalog, pRpc, pMgmtEps, dbName, forceUpdate, &db));
+  CTG_ERR_JRET(ctgGetDBVgroup(pCatalog, pRpc, pMgmtEps, dbName, forceUpdate, &dbCache));
 
-  vgList = taosArrayInit(taosHashGetSize(db->vgInfo), sizeof(SVgroupInfo));
+  int32_t vgNum = (int32_t)taosHashGetSize(dbCache->vgInfo->vgHash);
+  vgList = taosArrayInit(vgNum, sizeof(SVgroupInfo));
   if (NULL == vgList) {
-    ctgError("taosArrayInit %d failed", taosHashGetSize(db->vgInfo));
+    ctgError("taosArrayInit %d failed", vgNum);
     CTG_ERR_JRET(TSDB_CODE_CTG_MEM_ERROR);    
   }
 
-  void *pIter = taosHashIterate(db->vgInfo, NULL);
+  void *pIter = taosHashIterate(dbCache->vgInfo->vgHash, NULL);
   while (pIter) {
     vgInfo = pIter;
 
     if (NULL == taosArrayPush(vgList, vgInfo)) {
       ctgError("taosArrayPush failed, vgId:%d", vgInfo->vgId);
+      taosHashCancelIterate(dbCache->vgInfo->vgHash, pIter);
       CTG_ERR_JRET(TSDB_CODE_CTG_MEM_ERROR);
     }
     
-    pIter = taosHashIterate(db->vgInfo, pIter);
+    pIter = taosHashIterate(dbCache->vgInfo->vgHash, pIter);
     vgInfo = NULL;
   }
 
@@ -1173,9 +1292,10 @@ int32_t catalogGetDBVgroup(struct SCatalog* pCatalog, void *pRpc, const SEpSet*
   vgList = NULL;
 
 _return:
-  if (db) {
-    CTG_UNLOCK(CTG_READ, &db->lock);
-    taosHashRelease(pCatalog->dbCache.cache, db);
+
+  if (dbCache) {
+    CTG_UNLOCK(CTG_READ, &dbCache->vgLock);
+    taosHashRelease(pCatalog->dbCache, dbCache);
   }
 
   if (vgList) {
@@ -1194,80 +1314,143 @@ int32_t catalogUpdateDBVgroup(struct SCatalog* pCatalog, const char* dbName, SDB
     CTG_ERR_JRET(TSDB_CODE_CTG_INVALID_INPUT);
   }
 
-  if (NULL == dbInfo->vgInfo || dbInfo->vgVersion < 0 || taosHashGetSize(dbInfo->vgInfo) <= 0) {
-    ctgError("invalid db vgInfo, dbName:%s, vgInfo:%p, vgVersion:%d", dbName, dbInfo->vgInfo, dbInfo->vgVersion);
+  if (NULL == dbInfo->vgHash || dbInfo->vgVersion < 0 || taosHashGetSize(dbInfo->vgHash) <= 0) {
+    ctgError("invalid db vgInfo, dbName:%s, vgHash:%p, vgVersion:%d", dbName, dbInfo->vgHash, dbInfo->vgVersion);
     CTG_ERR_JRET(TSDB_CODE_CTG_MEM_ERROR);
   }
 
-  if (NULL == pCatalog->dbCache.cache) {
+  if (NULL == pCatalog->dbCache) {
     SHashObj *cache = taosHashInit(ctgMgmt.cfg.maxDBCacheNum, taosGetDefaultHashFunction(TSDB_DATA_TYPE_BINARY), true, HASH_ENTRY_LOCK);
     if (NULL == cache) {
       ctgError("taosHashInit %d failed", CTG_DEFAULT_CACHE_DB_NUMBER);
       CTG_ERR_JRET(TSDB_CODE_CTG_MEM_ERROR);
     }
 
-    if (NULL != atomic_val_compare_exchange_ptr(&pCatalog->dbCache.cache, NULL, cache)) {
+    if (NULL != atomic_val_compare_exchange_ptr(&pCatalog->dbCache, NULL, cache)) {
       taosHashCleanup(cache);
     }
-  } else {
-    CTG_ERR_JRET(ctgValidateAndFreeDbInfo(pCatalog, dbName, dbInfo));
   }
 
   bool newAdded = false;
-  
-  dbInfo->lock = 0;
-  if (taosHashPutExt(pCatalog->dbCache.cache, dbName, strlen(dbName), dbInfo, sizeof(*dbInfo), &newAdded) != 0) {
-    ctgError("taosHashPutExt db vgroup to cache failed, db:%s", dbName);
-    CTG_ERR_JRET(TSDB_CODE_CTG_MEM_ERROR);
+  SDbVgVersion vgVersion = {.dbId = dbInfo->dbId, .vgVersion = dbInfo->vgVersion};
+
+  SCtgDBCache *dbCache = (SCtgDBCache *)taosHashAcquire(pCatalog->dbCache, dbName, strlen(dbName));
+  if (dbCache) {
+    CTG_LOCK(CTG_WRITE, &dbCache->vgLock);
+    
+    if (NULL == dbCache->vgInfo) {
+      newAdded = true;
+
+      dbCache->vgInfo = dbInfo;
+    } else {
+      if (dbCache->vgInfo->dbId != dbInfo->dbId) {
+        ctgMetaRentRemove(&pCatalog->dbRent, dbCache->vgInfo->dbId, ctgDbVgVersionCompare);
+        newAdded = true;
+      } else if (dbInfo->vgVersion <= dbCache->vgInfo->vgVersion) {
+        ctgInfo("db vgVersion is old, db:%s, vgVersion:%d, current:%d", dbName, dbInfo->vgVersion, dbCache->vgInfo->vgVersion);
+        CTG_UNLOCK(CTG_WRITE, &dbCache->vgLock);
+        taosHashRelease(pCatalog->dbCache, dbCache);
+        
+        goto _return;
+      }
+      
+      if (dbCache->vgInfo->vgHash) {
+        ctgInfo("cleanup db vgHash, db:%s", dbName);
+        taosHashCleanup(dbCache->vgInfo->vgHash);
+        dbCache->vgInfo->vgHash = NULL;
+      }
+
+      tfree(dbCache->vgInfo);
+      dbCache->vgInfo = dbInfo;
+    }
+
+    CTG_UNLOCK(CTG_WRITE, &dbCache->vgLock);
+    taosHashRelease(pCatalog->dbCache, dbCache);
+  } else {
+    SCtgDBCache newDBCache = {0};
+    newDBCache.vgInfo = dbInfo;
+    
+    if (taosHashPut(pCatalog->dbCache, dbName, strlen(dbName), &newDBCache, sizeof(newDBCache)) != 0) {
+      ctgError("taosHashPut db & db vgroup to cache failed, db:%s", dbName);
+      CTG_ERR_JRET(TSDB_CODE_CTG_MEM_ERROR);
+    }
+
+    newAdded = true;
   }
 
-  dbInfo->vgInfo = NULL;
+  dbInfo = NULL;
 
-  SDbVgVersion vgVersion = {.dbId = dbInfo->dbId, .vgVersion = dbInfo->vgVersion};
-  strncpy(vgVersion.dbName, dbName, sizeof(vgVersion.dbName));
+  strncpy(vgVersion.dbFName, dbName, sizeof(vgVersion.dbFName));
   
   if (newAdded) {
-    CTG_ERR_JRET(ctgMetaRentAdd(&pCatalog->dbRent, &vgVersion, dbInfo->dbId, sizeof(SDbVgVersion)));
+    CTG_ERR_JRET(ctgMetaRentAdd(&pCatalog->dbRent, &vgVersion, vgVersion.dbId, sizeof(SDbVgVersion)));
   } else {
-    CTG_ERR_JRET(ctgMetaRentUpdate(&pCatalog->dbRent, &vgVersion, dbInfo->dbId, sizeof(SDbVgVersion), ctgDbVgVersionCompare));
+    CTG_ERR_JRET(ctgMetaRentUpdate(&pCatalog->dbRent, &vgVersion, vgVersion.dbId, sizeof(SDbVgVersion), ctgDbVgVersionCompare));
   }
   
-  ctgDebug("dbName:%s vgroup updated, vgVersion:%d", dbName, dbInfo->vgVersion);
+  ctgDebug("dbName:%s vgroup updated, vgVersion:%d", dbName, vgVersion.vgVersion);
 
 
 _return:
 
-  if (dbInfo && dbInfo->vgInfo) {
-    taosHashCleanup(dbInfo->vgInfo);
-    dbInfo->vgInfo = NULL;
+  if (dbInfo) {
+    taosHashCleanup(dbInfo->vgHash);
+    dbInfo->vgHash = NULL;
+    tfree(dbInfo);
   }
   
   CTG_RET(code);
 }
 
 
-int32_t catalogRemoveDBVgroup(struct SCatalog* pCatalog, SDbVgVersion* dbInfo) {
+int32_t catalogRemoveDB(struct SCatalog* pCatalog, const char* dbName, uint64_t dbId) {
   int32_t code = 0;
   bool removed = false;
   
-  if (NULL == pCatalog || NULL == dbInfo) {
+  if (NULL == pCatalog || NULL == dbName) {
     CTG_ERR_RET(TSDB_CODE_CTG_INVALID_INPUT);
   }
 
-  if (NULL == pCatalog->dbCache.cache) {
+  if (NULL == pCatalog->dbCache) {
     return TSDB_CODE_SUCCESS;
   }
   
-  CTG_ERR_RET(ctgValidateAndRemoveDbInfo(pCatalog, dbInfo, &removed));
+  CTG_ERR_RET(ctgValidateAndRemoveDb(pCatalog, dbName, dbId, &removed));
   if (!removed) {
     return TSDB_CODE_SUCCESS;
   }
   
-  ctgInfo("db removed from cache, db:%s", dbInfo->dbName);
+  ctgInfo("db removed from cache, db:%s, uid:%"PRIx64, dbName, dbId);
 
-  CTG_ERR_RET(ctgMetaRentRemove(&pCatalog->dbRent, dbInfo->dbId, ctgDbVgVersionCompare));
+  CTG_ERR_RET(ctgMetaRentRemove(&pCatalog->dbRent, dbId, ctgDbVgVersionCompare));
   
-  ctgDebug("db removed from rent, db:%s", dbInfo->dbName);
+  ctgDebug("db removed from rent, db:%s, uid:%"PRIx64, dbName, dbId);
+  
+  CTG_RET(code);
+}
+
+int32_t catalogRemoveSTableMeta(struct SCatalog* pCatalog, const char* dbName, const char* stbName, uint64_t suid) {
+  int32_t code = 0;
+  bool removed = false;
+  
+  if (NULL == pCatalog || NULL == dbName || NULL == stbName) {
+    CTG_ERR_RET(TSDB_CODE_CTG_INVALID_INPUT);
+  }
+
+  if (NULL == pCatalog->dbCache) {
+    return TSDB_CODE_SUCCESS;
+  }
+  
+  CTG_ERR_RET(ctgValidateAndRemoveStbMeta(pCatalog, dbName, stbName, suid, &removed));
+  if (!removed) {
+    return TSDB_CODE_SUCCESS;
+  }
+  
+  ctgInfo("stb removed from cache, db:%s, stbName:%s, suid:%"PRIx64, dbName, stbName, suid);
+
+  CTG_ERR_RET(ctgMetaRentRemove(&pCatalog->stbRent, suid, ctgSTableVersionCompare));
+  
+  ctgDebug("stb removed from rent, db:%s, stbName:%s, suid:%"PRIx64, dbName, stbName, suid);
   
   CTG_RET(code);
 }
@@ -1301,7 +1484,7 @@ int32_t catalogGetTableDistVgroup(struct SCatalog* pCatalog, void *pRpc, const S
   STableMeta *tbMeta = NULL;
   int32_t code = 0;
   SVgroupInfo vgroupInfo = {0};
-  SDBVgroupInfo* dbVgroup = NULL;
+  SCtgDBCache* dbCache = NULL;
   SArray *vgList = NULL;
 
   *pVgroupList = NULL;
@@ -1310,7 +1493,7 @@ int32_t catalogGetTableDistVgroup(struct SCatalog* pCatalog, void *pRpc, const S
 
   char db[TSDB_DB_FNAME_LEN] = {0};
   tNameGetFullDbName(pTableName, db);
-  CTG_ERR_JRET(ctgGetDBVgroup(pCatalog, pRpc, pMgmtEps, db, false, &dbVgroup));
+  CTG_ERR_JRET(ctgGetDBVgroup(pCatalog, pRpc, pMgmtEps, db, false, &dbCache));
 
   // REMOEV THIS ....
   if (0 == tbMeta->vgId) {
@@ -1323,10 +1506,10 @@ int32_t catalogGetTableDistVgroup(struct SCatalog* pCatalog, void *pRpc, const S
   // REMOVE THIS ....
 
   if (tbMeta->tableType == TSDB_SUPER_TABLE) {
-    CTG_ERR_JRET(ctgGetVgInfoFromDB(pCatalog, pRpc, pMgmtEps, dbVgroup, pVgroupList));
+    CTG_ERR_JRET(ctgGetVgInfoFromDB(pCatalog, pRpc, pMgmtEps, dbCache->vgInfo, pVgroupList));
   } else {
     int32_t vgId = tbMeta->vgId;
-    if (NULL == taosHashGetClone(dbVgroup->vgInfo, &vgId, sizeof(vgId), &vgroupInfo)) {
+    if (NULL == taosHashGetClone(dbCache->vgInfo->vgHash, &vgId, sizeof(vgId), &vgroupInfo)) {
       ctgError("table's vgId not found in vgroup list, vgId:%d, tbName:%s", vgId, tNameGetTableName(pTableName));
       CTG_ERR_JRET(TSDB_CODE_CTG_INTERNAL_ERROR);    
     }
@@ -1349,9 +1532,9 @@ int32_t catalogGetTableDistVgroup(struct SCatalog* pCatalog, void *pRpc, const S
 _return:
   tfree(tbMeta);
 
-  if (dbVgroup) {
-    CTG_UNLOCK(CTG_READ, &dbVgroup->lock);
-    taosHashRelease(pCatalog->dbCache.cache, dbVgroup);
+  if (dbCache) {
+    CTG_UNLOCK(CTG_READ, &dbCache->vgLock);
+    taosHashRelease(pCatalog->dbCache, dbCache);
   }
 
   if (vgList) {
@@ -1364,21 +1547,21 @@ _return:
 
 
 int32_t catalogGetTableHashVgroup(struct SCatalog *pCatalog, void *pTransporter, const SEpSet *pMgmtEps, const SName *pTableName, SVgroupInfo *pVgroup) {
-  SDBVgroupInfo* dbInfo = NULL;
+  SCtgDBCache* dbCache = NULL;
   int32_t code = 0;
 
   char db[TSDB_DB_FNAME_LEN] = {0};
   tNameGetFullDbName(pTableName, db);
 
-  CTG_ERR_RET(ctgGetDBVgroup(pCatalog, pTransporter, pMgmtEps, db, false, &dbInfo));
+  CTG_ERR_RET(ctgGetDBVgroup(pCatalog, pTransporter, pMgmtEps, db, false, &dbCache));
 
-  CTG_ERR_JRET(ctgGetVgInfoFromHashValue(pCatalog, dbInfo, pTableName, pVgroup));
+  CTG_ERR_JRET(ctgGetVgInfoFromHashValue(pCatalog, dbCache->vgInfo, pTableName, pVgroup));
 
 _return:
 
-  if (dbInfo) {
-    CTG_UNLOCK(CTG_READ, &dbInfo->lock);  
-    taosHashRelease(pCatalog->dbCache.cache, dbInfo);
+  if (dbCache) {
+    CTG_UNLOCK(CTG_READ, &dbCache->vgLock);  
+    taosHashRelease(pCatalog->dbCache, dbCache);
   }
 
   CTG_RET(code);
@@ -1422,6 +1605,7 @@ int32_t catalogGetAllMeta(struct SCatalog* pCatalog, void *pTransporter, const S
   return TSDB_CODE_SUCCESS;
 
 _return:  
+
   if (pRsp->pTableMeta) {
     int32_t aSize = taosArrayGetSize(pRsp->pTableMeta);
     for (int32_t i = 0; i < aSize; ++i) {
@@ -1451,7 +1635,7 @@ int32_t catalogGetExpiredSTables(struct SCatalog* pCatalog, SSTableMetaVersion *
     CTG_ERR_RET(TSDB_CODE_CTG_INVALID_INPUT);
   }
 
-  CTG_RET(ctgMetaRentGet(&pCatalog->stableRent, (void **)stables, num, sizeof(SSTableMetaVersion)));
+  CTG_RET(ctgMetaRentGet(&pCatalog->stbRent, (void **)stables, num, sizeof(SSTableMetaVersion)));
 }
 
 int32_t catalogGetExpiredDBs(struct SCatalog* pCatalog, SDbVgVersion **dbs, uint32_t *num) {
diff --git a/source/libs/catalog/test/catalogTests.cpp b/source/libs/catalog/test/catalogTests.cpp
index c6e5e359bfff039914ee7850bb78fb3634e5976b..751fa72347973ede04f3e72765f018dc01cfb2ae 100644
--- a/source/libs/catalog/test/catalogTests.cpp
+++ b/source/libs/catalog/test/catalogTests.cpp
@@ -128,15 +128,14 @@ void ctgTestBuildCTableMetaOutput(STableMetaOutput *output) {
   strcpy(sn.dbname, "db1");
   strcpy(sn.tname, ctgTestSTablename);
 
-  char tbFullName[TSDB_TABLE_FNAME_LEN];
-  tNameExtractFullName(&cn, tbFullName);
+  char db[TSDB_DB_FNAME_LEN] = {0};
+  tNameGetFullDbName(&cn, db);
 
+  strcpy(output->dbFName, db);
   SET_META_TYPE_BOTH_TABLE(output->metaType);
 
-  strcpy(output->ctbFname, tbFullName);
-
-  tNameExtractFullName(&cn, tbFullName);
-  strcpy(output->tbFname, tbFullName);
+  strcpy(output->ctbName, cn.tname);
+  strcpy(output->tbName, sn.tname);
 
   output->ctbMeta.vgId = 9;
   output->ctbMeta.tableType = TSDB_CHILD_TABLE;
@@ -175,10 +174,11 @@ void ctgTestBuildCTableMetaOutput(STableMetaOutput *output) {
   strcpy(s->name, "tag1s");
 }
 
-void ctgTestBuildDBVgroup(SDBVgroupInfo *dbVgroup) {
+void ctgTestBuildDBVgroup(SDBVgroupInfo **pdbVgroup) {
   static int32_t vgVersion = ctgTestVgVersion + 1;
   int32_t        vgNum = 0;
   SVgroupInfo    vgInfo = {0};
+  SDBVgroupInfo *dbVgroup = (SDBVgroupInfo *)calloc(1, sizeof(SDBVgroupInfo));
 
   dbVgroup->vgVersion = vgVersion++;
 
@@ -186,7 +186,7 @@ void ctgTestBuildDBVgroup(SDBVgroupInfo *dbVgroup) {
 
   dbVgroup->hashMethod = 0;
   dbVgroup->dbId = ctgTestDbId;
-  dbVgroup->vgInfo = taosHashInit(ctgTestVgNum, taosGetDefaultHashFunction(TSDB_DATA_TYPE_INT), true, HASH_ENTRY_LOCK);
+  dbVgroup->vgHash = taosHashInit(ctgTestVgNum, taosGetDefaultHashFunction(TSDB_DATA_TYPE_INT), true, HASH_ENTRY_LOCK);
 
   vgNum = ctgTestGetVgNumFromVgVersion(dbVgroup->vgVersion);
   uint32_t hashUnit = UINT32_MAX / vgNum;
@@ -203,8 +203,10 @@ void ctgTestBuildDBVgroup(SDBVgroupInfo *dbVgroup) {
       addr->port = htons(n + 22);
     }
 
-    taosHashPut(dbVgroup->vgInfo, &vgInfo.vgId, sizeof(vgInfo.vgId), &vgInfo, sizeof(vgInfo));
+    taosHashPut(dbVgroup->vgHash, &vgInfo.vgId, sizeof(vgInfo.vgId), &vgInfo, sizeof(vgInfo));
   }
+
+  *pdbVgroup = dbVgroup;
 }
 
 void ctgTestPrepareDbVgroups(void *shandle, SEpSet *pEpSet, SRpcMsg *pMsg, SRpcMsg *pRsp) {
@@ -250,7 +252,8 @@ void ctgTestPrepareTableMeta(void *shandle, SEpSet *pEpSet, SRpcMsg *pMsg, SRpcM
   pRsp->contLen = sizeof(STableMetaRsp) + (ctgTestColNum + ctgTestTagNum) * sizeof(SSchema);
   pRsp->pCont = calloc(1, pRsp->contLen);
   rspMsg = (STableMetaRsp *)pRsp->pCont;
-  sprintf(rspMsg->tbFname, "%s.%s", ctgTestDbname, ctgTestTablename);
+  strcpy(rspMsg->dbFName, ctgTestDbname);
+  strcpy(rspMsg->tbName, ctgTestTablename);
   rspMsg->numOfTags = 0;
   rspMsg->numOfColumns = htonl(ctgTestColNum);
   rspMsg->precision = 1;
@@ -285,8 +288,9 @@ void ctgTestPrepareCTableMeta(void *shandle, SEpSet *pEpSet, SRpcMsg *pMsg, SRpc
   pRsp->contLen = sizeof(STableMetaRsp) + (ctgTestColNum + ctgTestTagNum) * sizeof(SSchema);
   pRsp->pCont = calloc(1, pRsp->contLen);
   rspMsg = (STableMetaRsp *)pRsp->pCont;
-  sprintf(rspMsg->tbFname, "%s.%s", ctgTestDbname, ctgTestCTablename);
-  sprintf(rspMsg->stbFname, "%s.%s", ctgTestDbname, ctgTestSTablename);
+  strcpy(rspMsg->dbFName, ctgTestDbname);
+  strcpy(rspMsg->tbName, ctgTestCTablename);
+  strcpy(rspMsg->stbName, ctgTestSTablename);
   rspMsg->numOfTags = htonl(ctgTestTagNum);
   rspMsg->numOfColumns = htonl(ctgTestColNum);
   rspMsg->precision = 1;
@@ -327,8 +331,9 @@ void ctgTestPrepareSTableMeta(void *shandle, SEpSet *pEpSet, SRpcMsg *pMsg, SRpc
   pRsp->contLen = sizeof(STableMetaRsp) + (ctgTestColNum + ctgTestTagNum) * sizeof(SSchema);
   pRsp->pCont = calloc(1, pRsp->contLen);
   rspMsg = (STableMetaRsp *)pRsp->pCont;
-  sprintf(rspMsg->tbFname, "%s.%s", ctgTestDbname, ctgTestSTablename);
-  sprintf(rspMsg->stbFname, "%s.%s", ctgTestDbname, ctgTestSTablename);
+  strcpy(rspMsg->dbFName, ctgTestDbname);
+  strcpy(rspMsg->tbName, ctgTestSTablename);  
+  strcpy(rspMsg->stbName, ctgTestSTablename);  
   rspMsg->numOfTags = htonl(ctgTestTagNum);
   rspMsg->numOfColumns = htonl(ctgTestColNum);
   rspMsg->precision = 1;
@@ -370,8 +375,9 @@ void ctgTestPrepareMultiSTableMeta(void *shandle, SEpSet *pEpSet, SRpcMsg *pMsg,
   pRsp->contLen = sizeof(STableMetaRsp) + (ctgTestColNum + ctgTestTagNum) * sizeof(SSchema);
   pRsp->pCont = calloc(1, pRsp->contLen);
   rspMsg = (STableMetaRsp *)pRsp->pCont;
-  sprintf(rspMsg->tbFname, "%s.%s_%d", ctgTestDbname, ctgTestSTablename, idx);
-  sprintf(rspMsg->stbFname, "%s.%s_%d", ctgTestDbname, ctgTestSTablename, idx);
+  strcpy(rspMsg->dbFName, ctgTestDbname);
+  sprintf(rspMsg->tbName, "%s_%d", ctgTestSTablename, idx);
+  sprintf(rspMsg->stbName, "%s_%d", ctgTestSTablename, idx);
   rspMsg->numOfTags = htonl(ctgTestTagNum);
   rspMsg->numOfColumns = htonl(ctgTestColNum);
   rspMsg->precision = 1;
@@ -589,12 +595,12 @@ void *ctgTestGetDbVgroupThread(void *param) {
 void *ctgTestSetDbVgroupThread(void *param) {
   struct SCatalog *pCtg = (struct SCatalog *)param;
   int32_t          code = 0;
-  SDBVgroupInfo    dbVgroup = {0};
+  SDBVgroupInfo    *dbVgroup = NULL;
   int32_t          n = 0;
 
   while (!ctgTestStop) {
     ctgTestBuildDBVgroup(&dbVgroup);
-    code = catalogUpdateDBVgroup(pCtg, ctgTestDbname, &dbVgroup);
+    code = catalogUpdateDBVgroup(pCtg, ctgTestDbname, dbVgroup);
     if (code) {
       assert(0);
     }
@@ -669,6 +675,7 @@ void *ctgTestSetCtableMetaThread(void *param) {
   return NULL;
 }
 
+
 TEST(tableMeta, normalTable) {
   struct SCatalog *pCtg = NULL;
   void            *mockPointer = (void *)0x1;
@@ -741,7 +748,7 @@ TEST(tableMeta, normalTable) {
     }
 
     if (stbNum) {
-      printf("got expired stb,suid:%" PRId64 "\n", stb->suid);
+      printf("got expired stb,suid:%" PRId64 ",dbFName:%s, stbName:%s\n", stb->suid, stb->dbFName, stb->stbName);
       free(stb);
       stb = NULL;
     } else {
@@ -837,7 +844,7 @@ TEST(tableMeta, childTableCase) {
     }
 
     if (stbNum) {
-      printf("got expired stb,suid:%" PRId64 "\n", stb->suid);
+      printf("got expired stb,suid:%" PRId64 ",dbFName:%s, stbName:%s\n", stb->suid, stb->dbFName, stb->stbName);      
       free(stb);
       stb = NULL;
     } else {
@@ -938,7 +945,8 @@ TEST(tableMeta, superTableCase) {
     }
 
     if (stbNum) {
-      printf("got expired stb,suid:%" PRId64 "\n", stb->suid);
+      printf("got expired stb,suid:%" PRId64 ",dbFName:%s, stbName:%s\n", stb->suid, stb->dbFName, stb->stbName);
+      
       free(stb);
       stb = NULL;
     } else {
@@ -1062,9 +1070,11 @@ TEST(dbVgroup, getSetDbVgroupCase) {
   void            *mockPointer = (void *)0x1;
   SVgroupInfo      vgInfo = {0};
   SVgroupInfo     *pvgInfo = NULL;
-  SDBVgroupInfo    dbVgroup = {0};
+  SDBVgroupInfo    *dbVgroup = NULL;
   SArray          *vgList = NULL;
 
+  ctgTestInitLogFile();
+
   ctgTestSetPrepareDbVgroupsAndNormalMeta();
 
   initQueryModuleMsgHandle();
@@ -1099,7 +1109,7 @@ TEST(dbVgroup, getSetDbVgroupCase) {
   taosArrayDestroy(vgList);
 
   ctgTestBuildDBVgroup(&dbVgroup);
-  code = catalogUpdateDBVgroup(pCtg, ctgTestDbname, &dbVgroup);
+  code = catalogUpdateDBVgroup(pCtg, ctgTestDbname, dbVgroup);
   ASSERT_EQ(code, 0);
 
   code = catalogGetTableHashVgroup(pCtg, mockPointer, (const SEpSet *)mockPointer, &n, &vgInfo);
@@ -1169,6 +1179,7 @@ TEST(multiThread, getSetDbVgroupCase) {
   catalogDestroy();
 }
 
+
 TEST(multiThread, ctableMeta) {
   struct SCatalog *pCtg = NULL;
   void            *mockPointer = (void *)0x1;
@@ -1178,6 +1189,8 @@ TEST(multiThread, ctableMeta) {
   SArray          *vgList = NULL;
   ctgTestStop = false;
 
+  ctgTestInitLogFile();
+
   ctgTestSetPrepareDbVgroupsAndChildMeta();
 
   initQueryModuleMsgHandle();
@@ -1212,11 +1225,13 @@ TEST(multiThread, ctableMeta) {
   }
 
   ctgTestStop = true;
-  sleep(1);
+  sleep(2);
 
   catalogDestroy();
 }
 
+
+
 TEST(rentTest, allRent) {
   struct SCatalog *pCtg = NULL;
   void            *mockPointer = (void *)0x1;
@@ -1229,6 +1244,8 @@ TEST(rentTest, allRent) {
   SSTableMetaVersion *stable = NULL;
   uint32_t            num = 0;
 
+  ctgTestInitLogFile();
+
   ctgTestSetPrepareDbVgroupsAndMultiSuperMeta();
 
   initQueryModuleMsgHandle();
@@ -1273,7 +1290,7 @@ TEST(rentTest, allRent) {
     printf("%d - expired stableNum:%d\n", i, num);
     if (stable) {
       for (int32_t n = 0; n < num; ++n) {
-        printf("suid:%" PRId64 ", sversion:%d, tversion:%d\n", stable[n].suid, stable[n].sversion, stable[n].tversion);
+        printf("suid:%" PRId64 ", dbFName:%s, stbName:%s, sversion:%d, tversion:%d\n", stable[n].suid, stable[n].dbFName, stable[n].stbName, stable[n].sversion, stable[n].tversion);
       }
       free(stable);
       stable = NULL;
@@ -1291,4 +1308,4 @@ int main(int argc, char **argv) {
   return RUN_ALL_TESTS();
 }
 
-#pragma GCC diagnostic pop
\ No newline at end of file
+#pragma GCC diagnostic pop
diff --git a/source/libs/parser/inc/astCreateFuncs.h b/source/libs/parser/inc/astCreateFuncs.h
index c31160a27e2a747ba64609989f40f851bc75cf97..15f0792d5c15a9e8c44f599329cebcf08524b4b1 100644
--- a/source/libs/parser/inc/astCreateFuncs.h
+++ b/source/libs/parser/inc/astCreateFuncs.h
@@ -30,7 +30,7 @@ extern SToken nil_token;
 SNodeList* createNodeList(SAstCreateContext* pCxt, SNode* pNode);
 SNodeList* addNodeToList(SAstCreateContext* pCxt, SNodeList* pList, SNode* pNode);
 
-SNode* createColumnNode(SAstCreateContext* pCxt, const SToken* pTableName, const SToken* pColumnName);
+SNode* createColumnNode(SAstCreateContext* pCxt, const SToken* pTableAlias, const SToken* pColumnName);
 SNode* createValueNode(SAstCreateContext* pCxt, int32_t dataType, const SToken* pLiteral);
 SNode* createDurationValueNode(SAstCreateContext* pCxt, const SToken* pLiteral);
 SNode* addMinusSign(SAstCreateContext* pCxt, SNode* pNode);
diff --git a/source/libs/parser/inc/new_sql.y b/source/libs/parser/inc/new_sql.y
index 451aaddc9e0954fdd39d6259d0305ed3b931791a..6616b80d179035e3d7f4fb23b73e17199a3355b1 100644
--- a/source/libs/parser/inc/new_sql.y
+++ b/source/libs/parser/inc/new_sql.y
@@ -187,7 +187,7 @@ table_reference(A) ::= joined_table(B).
 table_primary(A) ::= table_name(B) alias_opt(C).                                  { PARSER_TRACE; A = createRealTableNode(pCxt, NULL, &B, &C); }
 table_primary(A) ::= db_name(B) NK_DOT table_name(C) alias_opt(D).                { PARSER_TRACE; A = createRealTableNode(pCxt, &B, &C, &D); }
 table_primary(A) ::= subquery(B) alias_opt(C).                                    { PARSER_TRACE; A = createTempTableNode(pCxt, B, &C); }
-table_primary ::= parenthesized_joined_table.
+table_primary(A) ::= parenthesized_joined_table(B).                               { PARSER_TRACE; A = B; }
 
 %type alias_opt                                                                   { SToken }
 %destructor alias_opt                                                             { PARSER_DESTRUCTOR_TRACE; }
@@ -297,9 +297,9 @@ query_expression_body(A) ::=
   query_expression_body(B) UNION ALL query_expression_body(D).                    { PARSER_TRACE; A = createSetOperator(pCxt, SET_OP_TYPE_UNION_ALL, B, D); }
 
 query_primary(A) ::= query_specification(B).                                      { PARSER_TRACE; A = B; }
-query_primary(A) ::=
-  NK_LP query_expression_body(B) 
-    order_by_clause_opt limit_clause_opt slimit_clause_opt NK_RP.                 { PARSER_TRACE; A = B;}
+//query_primary(A) ::=
+//  NK_LP query_expression_body(B) 
+//    order_by_clause_opt slimit_clause_opt limit_clause_opt NK_RP.                 { PARSER_TRACE; A = B;}
 
 %type order_by_clause_opt                                                         { SNodeList* }
 %destructor order_by_clause_opt                                                   { PARSER_DESTRUCTOR_TRACE; nodesDestroyList($$); }
@@ -317,7 +317,7 @@ limit_clause_opt(A) ::= LIMIT NK_INTEGER(B) OFFSET NK_INTEGER(C).
 limit_clause_opt(A) ::= LIMIT NK_INTEGER(C) NK_COMMA NK_INTEGER(B).               { PARSER_TRACE; A = createLimitNode(pCxt, &B, &C); }
 
 /************************************************ subquery ************************************************************/
-subquery(A) ::= NK_LR query_expression(B) NK_RP.                                  { PARSER_TRACE; A = B; }
+subquery(A) ::= NK_LP query_expression(B) NK_RP.                                  { PARSER_TRACE; A = B; }
 
 /************************************************ search_condition ****************************************************/
 search_condition(A) ::= boolean_value_expression(B).                              { PARSER_TRACE; A = B; }
diff --git a/source/libs/parser/inc/parserImpl.h b/source/libs/parser/inc/parserImpl.h
index 57012e2fd67736912d08aeb4735d8a91499254c0..183075d4657e07a3e6ea0a78abee8b51f9504bd1 100644
--- a/source/libs/parser/inc/parserImpl.h
+++ b/source/libs/parser/inc/parserImpl.h
@@ -28,6 +28,7 @@ typedef struct SQuery {
 } SQuery;
 
 int32_t doParse(SParseContext* pParseCxt, SQuery* pQuery);
+int32_t doTranslate(SParseContext* pParseCxt, SQuery* pQuery);
 
 #ifdef __cplusplus
 }
diff --git a/source/libs/parser/src/astCreateFuncs.c b/source/libs/parser/src/astCreateFuncs.c
index f054649e1a5af6871ebf1cbf23412201d2f06520..6091961ed53e5e4ceabb014a5fa07138ef487d5f 100644
--- a/source/libs/parser/src/astCreateFuncs.c
+++ b/source/libs/parser/src/astCreateFuncs.c
@@ -60,14 +60,14 @@ SNodeList* addNodeToList(SAstCreateContext* pCxt, SNodeList* pList, SNode* pNode
   return nodesListAppend(pList, pNode);
 }
 
-SNode* createColumnNode(SAstCreateContext* pCxt, const SToken* pTableName, const SToken* pColumnName) {
-  if (!checkTableName(pCxt, pTableName) || !checkColumnName(pCxt, pColumnName)) {
+SNode* createColumnNode(SAstCreateContext* pCxt, const SToken* pTableAlias, const SToken* pColumnName) {
+  if (!checkTableName(pCxt, pTableAlias) || !checkColumnName(pCxt, pColumnName)) {
     return NULL;
   }
   SColumnNode* col = (SColumnNode*)nodesMakeNode(QUERY_NODE_COLUMN);
   CHECK_OUT_OF_MEM(col);
-  if (NULL != pTableName) {
-    strncpy(col->tableName, pTableName->z, pTableName->n);
+  if (NULL != pTableAlias) {
+    strncpy(col->tableAlias, pTableAlias->z, pTableAlias->n);
   }
   strncpy(col->colName, pColumnName->z, pColumnName->n);
   return (SNode*)col;
@@ -150,7 +150,14 @@ SNode* createRealTableNode(SAstCreateContext* pCxt, const SToken* pDbName, const
   SRealTableNode* realTable = (SRealTableNode*)nodesMakeNode(QUERY_NODE_REAL_TABLE);
   CHECK_OUT_OF_MEM(realTable);
   if (NULL != pDbName) {
-    strncpy(realTable->dbName, pDbName->z, pDbName->n);
+    strncpy(realTable->table.dbName, pDbName->z, pDbName->n);
+  } else {
+    strcpy(realTable->table.dbName, pCxt->pQueryCxt->db);
+  }
+  if (NULL != pTableAlias && TK_NIL != pTableAlias->type) {
+    strncpy(realTable->table.tableAlias, pTableAlias->z, pTableAlias->n);
+  } else {
+    strncpy(realTable->table.tableAlias, pTableName->z, pTableName->n);
   }
   strncpy(realTable->table.tableName, pTableName->z, pTableName->n);
   return (SNode*)realTable;
@@ -160,6 +167,9 @@ SNode* createTempTableNode(SAstCreateContext* pCxt, SNode* pSubquery, const STok
   STempTableNode* tempTable = (STempTableNode*)nodesMakeNode(QUERY_NODE_TEMP_TABLE);
   CHECK_OUT_OF_MEM(tempTable);
   tempTable->pSubquery = pSubquery;
+  if (NULL != pTableAlias && TK_NIL != pTableAlias->type) {
+    strncpy(tempTable->table.tableAlias, pTableAlias->z, pTableAlias->n);
+  }
   return (SNode*)tempTable;
 }
 
@@ -288,9 +298,6 @@ SNode* createSelectStmt(SAstCreateContext* pCxt, bool isDistinct, SNodeList* pPr
   SSelectStmt* select = (SSelectStmt*)nodesMakeNode(QUERY_NODE_SELECT_STMT);
   CHECK_OUT_OF_MEM(select);
   select->isDistinct = isDistinct;
-  if (NULL == pProjectionList) {
-    select->isStar = true;
-  }
   select->pProjectionList = pProjectionList;
   select->pFromTable = pTable;
   return (SNode*)select;
diff --git a/source/libs/parser/src/astTranslate.c b/source/libs/parser/src/astTranslate.c
deleted file mode 100644
index ff68c4b22c110abd8d087604dcc8baefc31aabb7..0000000000000000000000000000000000000000
--- a/source/libs/parser/src/astTranslate.c
+++ /dev/null
@@ -1,18 +0,0 @@
-/*
- * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
- *
- * This program is free software: you can use, redistribute, and/or modify
- * it under the terms of the GNU Affero General Public License, version 3
- * or later ("AGPL"), as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.
- *
- * You should have received a copy of the GNU Affero General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-// int32_t doTranslate() {
-
-// }
diff --git a/source/libs/parser/src/new_sql.c b/source/libs/parser/src/new_sql.c
index 20f82c150aec158ce3f577b3aa2f2d38073cd401..8ce36a6425d3cf7712a155274df431aced84d22b 100644
--- a/source/libs/parser/src/new_sql.c
+++ b/source/libs/parser/src/new_sql.c
@@ -109,21 +109,21 @@
 #endif
 /************* Begin control #defines *****************************************/
 #define YYCODETYPE unsigned char
-#define YYNOCODE 125
+#define YYNOCODE 124
 #define YYACTIONTYPE unsigned short int
 #define NewParseTOKENTYPE  SToken 
 typedef union {
   int yyinit;
   NewParseTOKENTYPE yy0;
-  EOperatorType yy40;
-  EFillMode yy44;
-  SToken yy79;
-  ENullOrder yy107;
-  EJoinType yy162;
-  SNodeList* yy174;
-  EOrder yy188;
-  SNode* yy212;
-  bool yy237;
+  EOrder yy10;
+  EFillMode yy14;
+  SNode* yy168;
+  ENullOrder yy177;
+  SNodeList* yy192;
+  bool yy209;
+  EOperatorType yy228;
+  EJoinType yy229;
+  SToken yy241;
 } YYMINORTYPE;
 #ifndef YYSTACKDEPTH
 #define YYSTACKDEPTH 100
@@ -138,17 +138,17 @@ typedef union {
 #define NewParseCTX_PARAM
 #define NewParseCTX_FETCH
 #define NewParseCTX_STORE
-#define YYNSTATE             149
-#define YYNRULE              135
-#define YYNTOKEN             73
-#define YY_MAX_SHIFT         148
-#define YY_MIN_SHIFTREDUCE   245
-#define YY_MAX_SHIFTREDUCE   379
-#define YY_ERROR_ACTION      380
-#define YY_ACCEPT_ACTION     381
-#define YY_NO_ACTION         382
-#define YY_MIN_REDUCE        383
-#define YY_MAX_REDUCE        517
+#define YYNSTATE             143
+#define YYNRULE              134
+#define YYNTOKEN             72
+#define YY_MAX_SHIFT         142
+#define YY_MIN_SHIFTREDUCE   238
+#define YY_MAX_SHIFTREDUCE   371
+#define YY_ERROR_ACTION      372
+#define YY_ACCEPT_ACTION     373
+#define YY_NO_ACTION         374
+#define YY_MIN_REDUCE        375
+#define YY_MAX_REDUCE        508
 /************* End control #defines *******************************************/
 #define YY_NLOOKAHEAD ((int)(sizeof(yy_lookahead)/sizeof(yy_lookahead[0])))
 
@@ -215,199 +215,202 @@ typedef union {
 **  yy_default[]       Default action for each state.
 **
 *********** Begin parsing tables **********************************************/
-#define YY_ACTTAB_COUNT (656)
+#define YY_ACTTAB_COUNT (705)
 static const YYACTIONTYPE yy_action[] = {
- /*     0 */   392,  390,   94,  494,   20,   67,  393,  390,   27,   25,
- /*    10 */    23,   22,   21,  400,  390,  321,   52,  131,  414,  144,
- /*    20 */   492,   74,   46,  401,  266,  403,   19,   89,   98,  119,
- /*    30 */   284,  285,  286,  287,  288,  289,  290,  292,  293,  294,
- /*    40 */    27,   25,   23,   22,   21,   23,   22,   21,  346,  465,
- /*    50 */   463,  247,  248,  249,  250,  145,  253,  320,   19,   89,
- /*    60 */    98,  132,  284,  285,  286,  287,  288,  289,  290,  292,
- /*    70 */   293,  294,   26,   24,  110,  344,  345,  347,  348,  247,
- /*    80 */   248,  249,  250,  145,  253,  260,  103,    6,  400,  390,
- /*    90 */   494,    8,  143,  414,  144,    3,  317,   41,  401,  111,
- /*   100 */   403,  439,   36,   53,   70,   96,  435,  492,  400,  390,
- /*   110 */   143,  414,  143,  414,  144,  469,  114,   41,  401,  128,
- /*   120 */   403,  439,  450,  148,   54,   96,  435,  450,  143,  414,
- /*   130 */   494,   34,   63,   36,  118,  490,  400,  390,  137,  448,
- /*   140 */   143,  414,  144,  493,  447,   41,  401,  492,  403,  439,
- /*   150 */    26,   24,  322,   96,  435,   54,   17,  247,  248,  249,
- /*   160 */   250,  145,  253,  454,  103,   28,  291,  400,  390,  295,
- /*   170 */   136,  143,  414,  144,    5,    4,   41,  401,  329,  403,
- /*   180 */   439,  138,  400,  390,  438,  435,  143,  414,  144,  415,
- /*   190 */   258,   41,  401,   76,  403,  439,  120,  115,  113,  123,
- /*   200 */   435,  400,  390,  377,  378,  143,  414,  144,   78,   34,
- /*   210 */    40,  401,   42,  403,  439,  343,  400,  390,   88,  435,
- /*   220 */   131,  414,  144,   26,   24,   46,  401,    7,  403,  134,
- /*   230 */   247,  248,  249,  250,  145,  253,  112,  103,    6,  476,
- /*   240 */    27,   25,   23,   22,   21,  109,   72,   26,   24,  130,
- /*   250 */    31,  140,  104,  462,  247,  248,  249,  250,  145,  253,
- /*   260 */   450,  103,   28,  400,  390,   55,  253,  143,  414,  144,
- /*   270 */   107,   57,   41,  401,   60,  403,  439,  446,  124,  108,
- /*   280 */   281,  436,   34,  400,  390,  475,   95,  143,  414,  144,
- /*   290 */     5,    4,   47,  401,   34,  403,  141,   59,  400,  390,
- /*   300 */   374,  375,  143,  414,  144,    2,   34,   86,  401,  105,
- /*   310 */   403,  400,  390,  302,  456,  143,  414,  144,   16,  122,
- /*   320 */    86,  401,  121,  403,   27,   25,   23,   22,   21,  133,
- /*   330 */   508,  400,  390,   62,  106,  143,  414,  144,   49,    1,
- /*   340 */    86,  401,   97,  403,  400,  390,   64,  317,  143,  414,
- /*   350 */   144,   13,   29,   47,  401,  296,  403,  400,  390,  421,
- /*   360 */   257,  143,  414,  144,   44,  260,   86,  401,  102,  403,
- /*   370 */   451,  400,  390,   30,   65,  143,  414,  144,  261,   29,
- /*   380 */    83,  401,  264,  403,  400,  390,  510,  466,  143,  414,
- /*   390 */   144,  509,  139,   80,  401,   99,  403,  400,  390,  135,
- /*   400 */   142,  143,  414,  144,  258,   77,   84,  401,  397,  403,
- /*   410 */   395,  400,  390,   75,  491,  143,  414,  144,   10,   29,
- /*   420 */    81,  401,   11,  403,  400,  390,   35,   56,  143,  414,
- /*   430 */   144,  340,   58,   85,  401,  342,  403,  400,  390,  336,
- /*   440 */    48,  143,  414,  144,   61,   38,  411,  401,  335,  403,
- /*   450 */   116,  400,  390,  117,   39,  143,  414,  144,  395,   12,
- /*   460 */   410,  401,    4,  403,  400,  390,  282,  315,  143,  414,
- /*   470 */   144,  314,   32,  409,  401,   69,  403,  400,  390,   33,
- /*   480 */   394,  143,  414,  144,   51,  368,   92,  401,   14,  403,
- /*   490 */     9,  400,  390,   37,  357,  143,  414,  144,  363,   79,
- /*   500 */    91,  401,  362,  403,  400,  390,  100,  367,  143,  414,
- /*   510 */   144,  366,  101,   93,  401,  251,  403,  400,  390,  384,
- /*   520 */   383,  143,  414,  144,   15,  147,   90,  401,  382,  403,
- /*   530 */   382,  400,  390,  382,  382,  143,  414,  144,  382,  382,
- /*   540 */    82,  401,  382,  403,  400,  390,  382,  382,  143,  414,
- /*   550 */   144,  382,  382,   87,  401,  382,  403,  127,   45,  382,
- /*   560 */   382,  382,  127,   45,  382,  382,   43,  382,  382,  382,
- /*   570 */   382,   43,  382,  382,  129,   66,  444,  445,  382,  444,
- /*   580 */    68,  444,  126,  382,  125,  382,  382,  127,   45,  382,
- /*   590 */   382,  382,  127,   45,  382,  382,   43,  382,  382,  382,
- /*   600 */   382,   43,  382,  381,  146,   50,  444,  445,  382,  444,
- /*   610 */    71,  444,  445,  382,  444,   27,   25,   23,   22,   21,
- /*   620 */    27,   25,   23,   22,   21,  382,  382,  382,  382,  261,
- /*   630 */   382,  382,   18,  494,  382,  382,  266,  382,   27,   25,
- /*   640 */    23,   22,   21,  382,  382,  382,   53,  382,   73,  382,
- /*   650 */   492,   27,   25,   23,   22,   21,
+ /*     0 */   384,  382,   89,   22,   64,  385,  382,  458,   29,   27,
+ /*    10 */    25,   24,   23,  392,  382,  137,  406,  126,  406,  138,
+ /*    20 */    71,  109,   44,  393,  259,  395,   21,   84,   93,  142,
+ /*    30 */   277,  278,  279,  280,  281,  282,  283,  285,  286,  287,
+ /*    40 */    29,   27,   25,   24,   23,   25,   24,   23,  125,    9,
+ /*    50 */   456,  240,  241,  242,  243,  139,  246,  106,   21,   84,
+ /*    60 */    93,   51,  277,  278,  279,  280,  281,  282,  283,  285,
+ /*    70 */   286,  287,  127,  392,  382,  137,  406,  137,  406,  138,
+ /*    80 */   315,  113,   38,  393,  114,  395,  431,  253,   28,   26,
+ /*    90 */    83,  427,  487,  443,  131,  240,  241,  242,  243,  139,
+ /*   100 */   246,  487,   98,    1,  340,  486,   67,   10,   51,  485,
+ /*   110 */   440,  392,  382,   60,   50,  137,  406,  138,  485,  123,
+ /*   120 */    39,  393,  314,  395,  431,   51,  125,    9,   91,  427,
+ /*   130 */   105,  338,  339,  341,  342,  392,  382,  132,  462,  137,
+ /*   140 */   406,  138,    4,  311,   39,  393,  407,  395,  431,   51,
+ /*   150 */   443,  443,   91,  427,   29,   27,   25,   24,   23,  323,
+ /*   160 */   392,  382,  483,   73,  137,  406,  138,  439,  438,   39,
+ /*   170 */   393,  251,  395,  431,  389,   18,  387,   91,  427,    7,
+ /*   180 */     6,   29,   27,   25,   24,   23,  134,  447,  127,  392,
+ /*   190 */   382,    7,    6,  137,  406,  138,   28,   26,   77,  393,
+ /*   200 */     8,  395,  295,  240,  241,  242,  243,  139,  246,  107,
+ /*   210 */    98,    1,   28,   26,  469,   10,  104,  487,   52,  240,
+ /*   220 */   241,  242,  243,  139,  246,  246,   98,    5,  102,   40,
+ /*   230 */    50,  135,  337,   19,  485,  392,  382,  130,  468,  137,
+ /*   240 */   406,  138,  103,  284,   39,  393,  288,  395,  431,   51,
+ /*   250 */    56,   54,  430,  427,   57,  370,  371,   29,   27,   25,
+ /*   260 */    24,   23,   30,  392,  382,  289,   90,  137,  406,  138,
+ /*   270 */     3,  254,   39,  393,  117,  395,  431,   28,   26,  316,
+ /*   280 */   118,  427,   47,  449,  240,  241,  242,  243,  139,  246,
+ /*   290 */    70,   98,    5,  101,  392,  382,  129,  127,  126,  406,
+ /*   300 */   138,  122,   43,   44,  393,  119,  395,  274,   30,   59,
+ /*   310 */    41,  257,    2,   29,   27,   25,   24,   23,   61,   65,
+ /*   320 */   436,  121,   15,  120,   69,  311,  487,   20,  413,  250,
+ /*   330 */    99,  455,   42,   29,   27,   25,   24,   23,  253,   50,
+ /*   340 */    28,   26,  444,  485,   31,   62,  254,  240,  241,  242,
+ /*   350 */   243,  139,  246,  459,   98,    1,  392,  382,   94,  502,
+ /*   360 */   137,  406,  138,  136,  484,   39,  393,   72,  395,  431,
+ /*   370 */    28,   26,  367,  368,  428,  133,  251,  240,  241,  242,
+ /*   380 */   243,  139,  246,   13,   98,    5,   29,   27,   25,   24,
+ /*   390 */    23,  115,  110,  108,  392,  382,   12,   30,  137,  406,
+ /*   400 */   138,   53,  259,   45,  393,  334,  395,   55,   34,  336,
+ /*   410 */   330,   46,   58,   35,  392,  382,  373,  140,  137,  406,
+ /*   420 */   138,  329,  111,   81,  393,  100,  395,  392,  382,  112,
+ /*   430 */   387,  137,  406,  138,   36,    6,   81,  393,  116,  395,
+ /*   440 */   128,  500,   14,  392,  382,  275,  487,  137,  406,  138,
+ /*   450 */   309,  308,   81,  393,   92,  395,  392,  382,   33,   50,
+ /*   460 */   137,  406,  138,  485,   66,   45,  393,   32,  395,  392,
+ /*   470 */   382,  386,   49,  137,  406,  138,  361,   16,   81,  393,
+ /*   480 */    97,  395,   37,   11,  356,  355,   74,   95,  360,  392,
+ /*   490 */   382,  359,   96,  137,  406,  138,  244,   17,   78,  393,
+ /*   500 */   376,  395,  375,  501,  374,  141,  392,  382,  374,  374,
+ /*   510 */   137,  406,  138,  374,  374,   75,  393,  374,  395,  392,
+ /*   520 */   382,  374,  374,  137,  406,  138,  374,  374,   79,  393,
+ /*   530 */   374,  395,  392,  382,  374,  374,  137,  406,  138,  374,
+ /*   540 */   374,   76,  393,  374,  395,  392,  382,  374,  374,  137,
+ /*   550 */   406,  138,  374,  374,   80,  393,  374,  395,  374,  374,
+ /*   560 */   374,  374,  374,  374,  392,  382,  374,  374,  137,  406,
+ /*   570 */   138,  374,  374,  403,  393,  374,  395,  374,  392,  382,
+ /*   580 */   374,  374,  137,  406,  138,  374,  374,  402,  393,  374,
+ /*   590 */   395,  392,  382,  374,  374,  137,  406,  138,  374,  374,
+ /*   600 */   401,  393,  374,  395,  392,  382,  374,  374,  137,  406,
+ /*   610 */   138,  374,  374,   87,  393,  374,  395,  392,  382,  374,
+ /*   620 */   374,  137,  406,  138,  374,  374,   86,  393,  374,  395,
+ /*   630 */   392,  382,  374,  374,  137,  406,  138,  374,  374,   88,
+ /*   640 */   393,  374,  395,  392,  382,  374,  374,  137,  406,  138,
+ /*   650 */   374,  374,   85,  393,  374,  395,  374,  392,  382,  374,
+ /*   660 */   374,  137,  406,  138,  374,  374,   82,  393,  374,  395,
+ /*   670 */   122,   43,  374,  374,  374,  122,   43,  374,  374,   41,
+ /*   680 */   374,  374,  122,   43,   41,  374,  374,  124,   63,  436,
+ /*   690 */   437,   41,  441,   48,  436,  437,  374,  441,  374,  374,
+ /*   700 */    68,  436,  437,  374,  441,
 };
 static const YYCODETYPE yy_lookahead[] = {
- /*     0 */    75,   76,   77,  103,   89,   90,   75,   76,    8,    9,
- /*    10 */    10,   11,   12,   75,   76,    4,  116,   79,   80,   81,
- /*    20 */   120,  123,   84,   85,   24,   87,   26,   27,   28,   22,
+ /*     0 */    74,   75,   76,   88,   89,   74,   75,   82,    8,    9,
+ /*    10 */    10,   11,   12,   74,   75,   78,   79,   78,   79,   80,
+ /*    20 */   122,   84,   83,   84,   24,   86,   26,   27,   28,   13,
  /*    30 */    30,   31,   32,   33,   34,   35,   36,   37,   38,   39,
- /*    40 */     8,    9,   10,   11,   12,   10,   11,   12,   29,   83,
- /*    50 */   112,   15,   16,   17,   18,   19,   20,   46,   26,   27,
- /*    60 */    28,   74,   30,   31,   32,   33,   34,   35,   36,   37,
- /*    70 */    38,   39,    8,    9,   55,   56,   57,   58,   59,   15,
- /*    80 */    16,   17,   18,   19,   20,   22,   22,   23,   75,   76,
- /*    90 */   103,   27,   79,   80,   81,   43,   44,   84,   85,  115,
- /*   100 */    87,   88,   23,  116,   41,   92,   93,  120,   75,   76,
- /*   110 */    79,   80,   79,   80,   81,  102,   85,   84,   85,  101,
- /*   120 */    87,   88,   82,   13,   45,   92,   93,   82,   79,   80,
- /*   130 */   103,   67,  108,   23,   85,  102,   75,   76,   21,   99,
- /*   140 */    79,   80,   81,  116,   99,   84,   85,  120,   87,   88,
- /*   150 */     8,    9,   10,   92,   93,   45,   26,   15,   16,   17,
- /*   160 */    18,   19,   20,  102,   22,   23,   36,   75,   76,   39,
- /*   170 */     3,   79,   80,   81,    1,    2,   84,   85,   10,   87,
- /*   180 */    88,   64,   75,   76,   92,   93,   79,   80,   81,   80,
- /*   190 */    22,   84,   85,  117,   87,   88,   50,   51,   52,   92,
- /*   200 */    93,   75,   76,   71,   72,   79,   80,   81,  117,   67,
- /*   210 */    84,   85,   21,   87,   88,   24,   75,   76,   92,   93,
- /*   220 */    79,   80,   81,    8,    9,   84,   85,  104,   87,   62,
- /*   230 */    15,   16,   17,   18,   19,   20,   54,   22,   23,  114,
- /*   240 */     8,    9,   10,   11,   12,   53,  105,    8,    9,   22,
- /*   250 */    23,   21,  111,  112,   15,   16,   17,   18,   19,   20,
- /*   260 */    82,   22,   23,   75,   76,  113,   20,   79,   80,   81,
- /*   270 */    76,   21,   84,   85,   24,   87,   88,   99,   27,   76,
- /*   280 */    29,   93,   67,   75,   76,  114,   76,   79,   80,   81,
- /*   290 */     1,    2,   84,   85,   67,   87,   66,  113,   75,   76,
- /*   300 */    68,   69,   79,   80,   81,   61,   67,   84,   85,   86,
- /*   310 */    87,   75,   76,   24,  110,   79,   80,   81,    2,   60,
- /*   320 */    84,   85,   86,   87,    8,    9,   10,   11,   12,  121,
- /*   330 */   122,   75,   76,  109,   48,   79,   80,   81,  107,   47,
- /*   340 */    84,   85,   86,   87,   75,   76,  106,   44,   79,   80,
- /*   350 */    81,   23,   21,   84,   85,   24,   87,   75,   76,   91,
- /*   360 */    22,   79,   80,   81,   79,   22,   84,   85,   86,   87,
- /*   370 */    82,   75,   76,   40,   94,   79,   80,   81,   22,   21,
- /*   380 */    84,   85,   24,   87,   75,   76,  124,   83,   79,   80,
- /*   390 */    81,  122,   63,   84,   85,   70,   87,   75,   76,  118,
- /*   400 */    65,   79,   80,   81,   22,  118,   84,   85,   23,   87,
- /*   410 */    25,   75,   76,  119,  119,   79,   80,   81,   21,   21,
- /*   420 */    84,   85,   49,   87,   75,   76,   21,   24,   79,   80,
- /*   430 */    81,   24,   23,   84,   85,   24,   87,   75,   76,   24,
- /*   440 */    23,   79,   80,   81,   23,   23,   84,   85,   24,   87,
- /*   450 */    15,   75,   76,   21,   23,   79,   80,   81,   25,   49,
- /*   460 */    84,   85,    2,   87,   75,   76,   29,   24,   79,   80,
- /*   470 */    81,   24,   42,   84,   85,   25,   87,   75,   76,   21,
- /*   480 */    25,   79,   80,   81,   25,   24,   84,   85,   21,   87,
- /*   490 */    49,   75,   76,    4,   24,   79,   80,   81,   15,   25,
- /*   500 */    84,   85,   15,   87,   75,   76,   15,   15,   79,   80,
- /*   510 */    81,   15,   15,   84,   85,   17,   87,   75,   76,    0,
- /*   520 */     0,   79,   80,   81,   23,   14,   84,   85,  125,   87,
- /*   530 */   125,   75,   76,  125,  125,   79,   80,   81,  125,  125,
- /*   540 */    84,   85,  125,   87,   75,   76,  125,  125,   79,   80,
- /*   550 */    81,  125,  125,   84,   85,  125,   87,   78,   79,  125,
- /*   560 */   125,  125,   78,   79,  125,  125,   87,  125,  125,  125,
- /*   570 */   125,   87,  125,  125,   95,   96,   97,   98,  125,  100,
- /*   580 */    96,   97,   98,  125,  100,  125,  125,   78,   79,  125,
- /*   590 */   125,  125,   78,   79,  125,  125,   87,  125,  125,  125,
- /*   600 */   125,   87,  125,   73,   74,   96,   97,   98,  125,  100,
- /*   610 */    96,   97,   98,  125,  100,    8,    9,   10,   11,   12,
- /*   620 */     8,    9,   10,   11,   12,  125,  125,  125,  125,   22,
- /*   630 */   125,  125,    2,  103,  125,  125,   24,  125,    8,    9,
- /*   640 */    10,   11,   12,  125,  125,  125,  116,  125,   41,  125,
- /*   650 */   120,    8,    9,   10,   11,   12,  125,  125,  125,  125,
- /*   660 */   125,  125,  125,  125,  125,  125,  125,  125,  125,  125,
- /*   670 */   125,  125,  125,  125,  125,  125,  125,  125,  125,  125,
- /*   680 */   125,  125,  125,  125,  125,  125,  125,  125,  125,  125,
- /*   690 */   125,  125,  125,  125,  125,  125,  125,  125,  125,  125,
- /*   700 */   125,  125,  125,  125,  125,  125,  125,  125,  125,  125,
- /*   710 */   125,  125,  125,  125,  125,  125,  125,  125,  125,  125,
- /*   720 */   125,  125,  125,  125,  125,
+ /*    40 */     8,    9,   10,   11,   12,   10,   11,   12,   22,   23,
+ /*    50 */   111,   15,   16,   17,   18,   19,   20,  114,   26,   27,
+ /*    60 */    28,   45,   30,   31,   32,   33,   34,   35,   36,   37,
+ /*    70 */    38,   39,   73,   74,   75,   78,   79,   78,   79,   80,
+ /*    80 */     4,   84,   83,   84,   22,   86,   87,   22,    8,    9,
+ /*    90 */    91,   92,  102,   81,   21,   15,   16,   17,   18,   19,
+ /*   100 */    20,  102,   22,   23,   29,  115,   41,   27,   45,  119,
+ /*   110 */    98,   74,   75,  107,  115,   78,   79,   80,  119,  100,
+ /*   120 */    83,   84,   46,   86,   87,   45,   22,   23,   91,   92,
+ /*   130 */    55,   56,   57,   58,   59,   74,   75,   64,  101,   78,
+ /*   140 */    79,   80,   43,   44,   83,   84,   79,   86,   87,   45,
+ /*   150 */    81,   81,   91,   92,    8,    9,   10,   11,   12,   10,
+ /*   160 */    74,   75,  101,  116,   78,   79,   80,   98,   98,   83,
+ /*   170 */    84,   22,   86,   87,   23,    2,   25,   91,   92,    1,
+ /*   180 */     2,    8,    9,   10,   11,   12,   21,  101,   73,   74,
+ /*   190 */    75,    1,    2,   78,   79,   80,    8,    9,   83,   84,
+ /*   200 */   103,   86,   24,   15,   16,   17,   18,   19,   20,   54,
+ /*   210 */    22,   23,    8,    9,  113,   27,   53,  102,  112,   15,
+ /*   220 */    16,   17,   18,   19,   20,   20,   22,   23,   75,   21,
+ /*   230 */   115,   66,   24,   26,  119,   74,   75,    3,  113,   78,
+ /*   240 */    79,   80,   75,   36,   83,   84,   39,   86,   87,   45,
+ /*   250 */   112,   21,   91,   92,   24,   70,   71,    8,    9,   10,
+ /*   260 */    11,   12,   21,   74,   75,   24,   75,   78,   79,   80,
+ /*   270 */    61,   22,   83,   84,   60,   86,   87,    8,    9,   10,
+ /*   280 */    91,   92,  106,  109,   15,   16,   17,   18,   19,   20,
+ /*   290 */    41,   22,   23,   48,   74,   75,   62,   73,   78,   79,
+ /*   300 */    80,   77,   78,   83,   84,   27,   86,   29,   21,  108,
+ /*   310 */    86,   24,   47,    8,    9,   10,   11,   12,  105,   95,
+ /*   320 */    96,   97,   23,   99,  104,   44,  102,    2,   90,   22,
+ /*   330 */   110,  111,   78,    8,    9,   10,   11,   12,   22,  115,
+ /*   340 */     8,    9,   81,  119,   40,   93,   22,   15,   16,   17,
+ /*   350 */    18,   19,   20,   82,   22,   23,   74,   75,   69,  123,
+ /*   360 */    78,   79,   80,   65,  118,   83,   84,  117,   86,   87,
+ /*   370 */     8,    9,   67,   68,   92,   63,   22,   15,   16,   17,
+ /*   380 */    18,   19,   20,   49,   22,   23,    8,    9,   10,   11,
+ /*   390 */    12,   50,   51,   52,   74,   75,   21,   21,   78,   79,
+ /*   400 */    80,   24,   24,   83,   84,   24,   86,   23,   21,   24,
+ /*   410 */    24,   23,   23,   23,   74,   75,   72,   73,   78,   79,
+ /*   420 */    80,   24,   15,   83,   84,   85,   86,   74,   75,   21,
+ /*   430 */    25,   78,   79,   80,   23,    2,   83,   84,   85,   86,
+ /*   440 */   120,  121,   49,   74,   75,   29,  102,   78,   79,   80,
+ /*   450 */    24,   24,   83,   84,   85,   86,   74,   75,   21,  115,
+ /*   460 */    78,   79,   80,  119,   25,   83,   84,   42,   86,   74,
+ /*   470 */    75,   25,   25,   78,   79,   80,   24,   21,   83,   84,
+ /*   480 */    85,   86,    4,   49,   15,   15,   25,   15,   15,   74,
+ /*   490 */    75,   15,   15,   78,   79,   80,   17,   23,   83,   84,
+ /*   500 */     0,   86,    0,  121,  124,   14,   74,   75,  124,  124,
+ /*   510 */    78,   79,   80,  124,  124,   83,   84,  124,   86,   74,
+ /*   520 */    75,  124,  124,   78,   79,   80,  124,  124,   83,   84,
+ /*   530 */   124,   86,   74,   75,  124,  124,   78,   79,   80,  124,
+ /*   540 */   124,   83,   84,  124,   86,   74,   75,  124,  124,   78,
+ /*   550 */    79,   80,  124,  124,   83,   84,  124,   86,  124,  124,
+ /*   560 */   124,  124,  124,  124,   74,   75,  124,  124,   78,   79,
+ /*   570 */    80,  124,  124,   83,   84,  124,   86,  124,   74,   75,
+ /*   580 */   124,  124,   78,   79,   80,  124,  124,   83,   84,  124,
+ /*   590 */    86,   74,   75,  124,  124,   78,   79,   80,  124,  124,
+ /*   600 */    83,   84,  124,   86,   74,   75,  124,  124,   78,   79,
+ /*   610 */    80,  124,  124,   83,   84,  124,   86,   74,   75,  124,
+ /*   620 */   124,   78,   79,   80,  124,  124,   83,   84,  124,   86,
+ /*   630 */    74,   75,  124,  124,   78,   79,   80,  124,  124,   83,
+ /*   640 */    84,  124,   86,   74,   75,  124,  124,   78,   79,   80,
+ /*   650 */   124,  124,   83,   84,  124,   86,  124,   74,   75,  124,
+ /*   660 */   124,   78,   79,   80,  124,  124,   83,   84,  124,   86,
+ /*   670 */    77,   78,  124,  124,  124,   77,   78,  124,  124,   86,
+ /*   680 */   124,  124,   77,   78,   86,  124,  124,   94,   95,   96,
+ /*   690 */    97,   86,   99,   95,   96,   97,  124,   99,  124,  124,
+ /*   700 */    95,   96,   97,  124,   99,
 };
-#define YY_SHIFT_COUNT    (148)
+#define YY_SHIFT_COUNT    (142)
 #define YY_SHIFT_MIN      (0)
-#define YY_SHIFT_MAX      (643)
+#define YY_SHIFT_MAX      (502)
 static const unsigned short int yy_shift_ofst[] = {
- /*     0 */   110,   64,   64,   64,   64,   64,   64,  142,  215,  239,
- /*    10 */   239,  239,  239,  239,  239,  239,  239,  239,  239,  239,
- /*    20 */   239,  239,  239,  239,  239,  239,  239,  239,  239,  239,
- /*    30 */   227,  227,  227,  227,   79,   36,   79,   79,    7,    7,
- /*    40 */     0,   32,   36,   63,   63,   63,  607,  232,   19,  146,
- /*    50 */    52,  168,  167,  167,   11,  182,  192,  246,  246,  182,
- /*    60 */   192,  246,  244,  259,  286,  292,  303,  328,  303,  338,
- /*    70 */   343,  303,  333,  356,  325,  329,  335,  335,  329,  382,
- /*    80 */   316,  630,  612,  643,  643,  643,  643,  643,  289,  130,
- /*    90 */    35,   35,   35,   35,  191,  250,  173,  331,  251,  132,
- /*   100 */   117,  230,  358,  385,  397,  398,  373,  403,  407,  409,
- /*   110 */   405,  411,  417,  421,  415,  422,  424,  435,  432,  433,
- /*   120 */   431,  398,  410,  460,  437,  443,  447,  450,  430,  458,
- /*   130 */   455,  459,  461,  467,  441,  470,  489,  483,  487,  491,
- /*   140 */   492,  496,  497,  474,  501,  498,  519,  520,  511,
+ /*     0 */    16,   80,  188,  188,  188,  204,  188,  188,  269,  104,
+ /*    10 */   332,  362,  362,  362,  362,  362,  362,  362,  362,  362,
+ /*    20 */   362,  362,  362,  362,  362,  362,  362,  362,  362,  362,
+ /*    30 */   362,   26,   26,   26,   36,   62,   62,   63,    0,   32,
+ /*    40 */    36,   65,   65,   65,  249,  305,   75,  341,   99,  149,
+ /*    50 */   234,   76,  155,  163,  205,  205,  155,  163,  205,  209,
+ /*    60 */   214,  245,  265,  281,  299,  281,  307,  316,  281,  304,
+ /*    70 */   324,  289,  298,  312,  354,  173,  325,  378,  146,  146,
+ /*    80 */   146,  146,  146,  178,  207,   35,   35,   35,   35,  208,
+ /*    90 */   230,  190,  241,  278,  185,   73,  165,  287,  151,  375,
+ /*   100 */   376,  334,  377,  381,  384,  387,  385,  388,  389,  386,
+ /*   110 */   390,  397,  407,  408,  405,  411,  376,  393,  433,  416,
+ /*   120 */   426,  427,  439,  425,  437,  446,  447,  452,  456,  434,
+ /*   130 */   478,  469,  470,  472,  473,  476,  477,  461,  474,  479,
+ /*   140 */   500,  502,  491,
 };
-#define YY_REDUCE_COUNT (79)
+#define YY_REDUCE_COUNT (74)
 #define YY_REDUCE_MIN   (-102)
-#define YY_REDUCE_MAX   (530)
+#define YY_REDUCE_MAX   (605)
 static const short yy_reduce_ofst[] = {
- /*     0 */   530,   13,   33,   61,   92,  107,  126,  141,  188,  208,
- /*    10 */   -62,  223,  236,  256,  269,  282,  296,  309,  322,  336,
- /*    20 */   349,  362,  376,  389,  402,  416,  429,  442,  456,  469,
- /*    30 */   479,  484,  509,  514,  -13,  -75, -100,   27,   31,   49,
- /*    40 */   -85,  -85,  -69,   40,   45,  178,  -34, -102,  -16,   24,
- /*    50 */    18,  109,   76,   91,  123,  125,  152,  194,  203,  171,
- /*    60 */   184,  210,  204,  224,  231,  240,   18,  268,   18,  285,
- /*    70 */   288,   18,  280,  304,  262,  281,  294,  295,  287,  109,
+ /*     0 */   344,   -1,   37,   61,   86,  115,  161,  189,  220,  224,
+ /*    10 */   282,  320,  -61,  340,  353,  369,  382,  395,  415,  432,
+ /*    20 */   445,  458,  471,  490,  504,  517,  530,  543,  556,  569,
+ /*    30 */   583,  593,  598,  605,  -74,  -63,   -3,  -10,  -85,  -85,
+ /*    40 */   -69,   12,   69,   70,  -75, -102,  -57,    6,   19,   67,
+ /*    50 */    47,   97,  101,  106,  153,  167,  125,  138,  191,  174,
+ /*    60 */   201,  176,  213,   19,  238,   19,  254,  261,   19,  252,
+ /*    70 */   271,  236,  246,  250,   67,
 };
 static const YYACTIONTYPE yy_default[] = {
- /*     0 */   380,  380,  380,  380,  380,  380,  380,  380,  380,  380,
- /*    10 */   380,  380,  380,  380,  380,  380,  380,  380,  380,  380,
- /*    20 */   380,  380,  380,  380,  380,  380,  380,  380,  380,  380,
- /*    30 */   380,  380,  380,  380,  380,  380,  380,  380,  380,  380,
- /*    40 */   380,  380,  380,  449,  449,  449,  464,  511,  380,  472,
- /*    50 */   380,  380,  496,  496,  457,  479,  477,  380,  380,  479,
- /*    60 */   477,  380,  489,  487,  470,  468,  442,  380,  380,  380,
- /*    70 */   380,  443,  380,  380,  514,  498,  502,  502,  498,  380,
- /*    80 */   380,  380,  380,  418,  417,  416,  412,  413,  380,  380,
- /*    90 */   407,  408,  406,  405,  380,  380,  507,  380,  380,  380,
- /*   100 */   499,  503,  380,  396,  461,  471,  380,  380,  380,  380,
- /*   110 */   380,  380,  380,  380,  380,  380,  380,  380,  380,  396,
- /*   120 */   380,  488,  380,  437,  380,  517,  445,  380,  380,  441,
- /*   130 */   395,  380,  380,  497,  380,  380,  380,  380,  380,  380,
- /*   140 */   380,  380,  380,  380,  380,  380,  380,  380,  380,
+ /*     0 */   372,  372,  372,  372,  372,  372,  372,  372,  372,  372,
+ /*    10 */   372,  372,  372,  372,  372,  372,  372,  372,  372,  372,
+ /*    20 */   372,  372,  372,  372,  372,  372,  372,  372,  372,  372,
+ /*    30 */   372,  372,  372,  372,  372,  372,  372,  372,  372,  372,
+ /*    40 */   372,  442,  442,  442,  457,  503,  372,  465,  372,  372,
+ /*    50 */   488,  450,  472,  470,  372,  372,  472,  470,  372,  482,
+ /*    60 */   480,  463,  461,  434,  372,  372,  372,  372,  435,  372,
+ /*    70 */   372,  506,  494,  490,  372,  372,  372,  372,  410,  409,
+ /*    80 */   408,  404,  405,  372,  372,  399,  400,  398,  397,  372,
+ /*    90 */   372,  499,  372,  372,  372,  491,  495,  372,  388,  454,
+ /*   100 */   464,  372,  372,  372,  372,  372,  372,  372,  372,  372,
+ /*   110 */   372,  372,  372,  372,  388,  372,  481,  372,  429,  372,
+ /*   120 */   441,  437,  372,  372,  433,  387,  372,  372,  489,  372,
+ /*   130 */   372,  372,  372,  372,  372,  372,  372,  372,  372,  372,
+ /*   140 */   372,  372,  372,
 };
 /********** End of lemon-generated parsing tables *****************************/
 
@@ -581,64 +584,63 @@ static const char *const yyTokenName[] = {
   /*   64 */ "SOFFSET",
   /*   65 */ "LIMIT",
   /*   66 */ "OFFSET",
-  /*   67 */ "NK_LR",
-  /*   68 */ "ASC",
-  /*   69 */ "DESC",
-  /*   70 */ "NULLS",
-  /*   71 */ "FIRST",
-  /*   72 */ "LAST",
-  /*   73 */ "cmd",
-  /*   74 */ "query_expression",
-  /*   75 */ "literal",
-  /*   76 */ "duration_literal",
-  /*   77 */ "literal_list",
-  /*   78 */ "db_name",
-  /*   79 */ "table_name",
-  /*   80 */ "column_name",
-  /*   81 */ "function_name",
-  /*   82 */ "table_alias",
-  /*   83 */ "column_alias",
-  /*   84 */ "expression",
-  /*   85 */ "column_reference",
-  /*   86 */ "expression_list",
-  /*   87 */ "subquery",
-  /*   88 */ "predicate",
-  /*   89 */ "compare_op",
-  /*   90 */ "in_op",
-  /*   91 */ "in_predicate_value",
-  /*   92 */ "boolean_value_expression",
-  /*   93 */ "boolean_primary",
-  /*   94 */ "from_clause",
-  /*   95 */ "table_reference_list",
-  /*   96 */ "table_reference",
-  /*   97 */ "table_primary",
-  /*   98 */ "joined_table",
-  /*   99 */ "alias_opt",
-  /*  100 */ "parenthesized_joined_table",
-  /*  101 */ "join_type",
-  /*  102 */ "search_condition",
-  /*  103 */ "query_specification",
-  /*  104 */ "set_quantifier_opt",
-  /*  105 */ "select_list",
-  /*  106 */ "where_clause_opt",
-  /*  107 */ "partition_by_clause_opt",
-  /*  108 */ "twindow_clause_opt",
-  /*  109 */ "group_by_clause_opt",
-  /*  110 */ "having_clause_opt",
-  /*  111 */ "select_sublist",
-  /*  112 */ "select_item",
-  /*  113 */ "sliding_opt",
-  /*  114 */ "fill_opt",
-  /*  115 */ "fill_mode",
-  /*  116 */ "query_expression_body",
-  /*  117 */ "order_by_clause_opt",
-  /*  118 */ "slimit_clause_opt",
-  /*  119 */ "limit_clause_opt",
-  /*  120 */ "query_primary",
-  /*  121 */ "sort_specification_list",
-  /*  122 */ "sort_specification",
-  /*  123 */ "ordering_specification_opt",
-  /*  124 */ "null_ordering_opt",
+  /*   67 */ "ASC",
+  /*   68 */ "DESC",
+  /*   69 */ "NULLS",
+  /*   70 */ "FIRST",
+  /*   71 */ "LAST",
+  /*   72 */ "cmd",
+  /*   73 */ "query_expression",
+  /*   74 */ "literal",
+  /*   75 */ "duration_literal",
+  /*   76 */ "literal_list",
+  /*   77 */ "db_name",
+  /*   78 */ "table_name",
+  /*   79 */ "column_name",
+  /*   80 */ "function_name",
+  /*   81 */ "table_alias",
+  /*   82 */ "column_alias",
+  /*   83 */ "expression",
+  /*   84 */ "column_reference",
+  /*   85 */ "expression_list",
+  /*   86 */ "subquery",
+  /*   87 */ "predicate",
+  /*   88 */ "compare_op",
+  /*   89 */ "in_op",
+  /*   90 */ "in_predicate_value",
+  /*   91 */ "boolean_value_expression",
+  /*   92 */ "boolean_primary",
+  /*   93 */ "from_clause",
+  /*   94 */ "table_reference_list",
+  /*   95 */ "table_reference",
+  /*   96 */ "table_primary",
+  /*   97 */ "joined_table",
+  /*   98 */ "alias_opt",
+  /*   99 */ "parenthesized_joined_table",
+  /*  100 */ "join_type",
+  /*  101 */ "search_condition",
+  /*  102 */ "query_specification",
+  /*  103 */ "set_quantifier_opt",
+  /*  104 */ "select_list",
+  /*  105 */ "where_clause_opt",
+  /*  106 */ "partition_by_clause_opt",
+  /*  107 */ "twindow_clause_opt",
+  /*  108 */ "group_by_clause_opt",
+  /*  109 */ "having_clause_opt",
+  /*  110 */ "select_sublist",
+  /*  111 */ "select_item",
+  /*  112 */ "sliding_opt",
+  /*  113 */ "fill_opt",
+  /*  114 */ "fill_mode",
+  /*  115 */ "query_expression_body",
+  /*  116 */ "order_by_clause_opt",
+  /*  117 */ "slimit_clause_opt",
+  /*  118 */ "limit_clause_opt",
+  /*  119 */ "query_primary",
+  /*  120 */ "sort_specification_list",
+  /*  121 */ "sort_specification",
+  /*  122 */ "ordering_specification_opt",
+  /*  123 */ "null_ordering_opt",
 };
 #endif /* defined(YYCOVERAGE) || !defined(NDEBUG) */
 
@@ -712,53 +714,53 @@ static const char *const yyRuleName[] = {
  /*  63 */ "table_primary ::= table_name alias_opt",
  /*  64 */ "table_primary ::= db_name NK_DOT table_name alias_opt",
  /*  65 */ "table_primary ::= subquery alias_opt",
- /*  66 */ "alias_opt ::=",
- /*  67 */ "alias_opt ::= table_alias",
- /*  68 */ "alias_opt ::= AS table_alias",
- /*  69 */ "parenthesized_joined_table ::= NK_LP joined_table NK_RP",
- /*  70 */ "parenthesized_joined_table ::= NK_LP parenthesized_joined_table NK_RP",
- /*  71 */ "joined_table ::= table_reference join_type JOIN table_reference ON search_condition",
- /*  72 */ "join_type ::= INNER",
- /*  73 */ "query_specification ::= SELECT set_quantifier_opt select_list from_clause where_clause_opt partition_by_clause_opt twindow_clause_opt group_by_clause_opt having_clause_opt",
- /*  74 */ "set_quantifier_opt ::=",
- /*  75 */ "set_quantifier_opt ::= DISTINCT",
- /*  76 */ "set_quantifier_opt ::= ALL",
- /*  77 */ "select_list ::= NK_STAR",
- /*  78 */ "select_list ::= select_sublist",
- /*  79 */ "select_sublist ::= select_item",
- /*  80 */ "select_sublist ::= select_sublist NK_COMMA select_item",
- /*  81 */ "select_item ::= expression",
- /*  82 */ "select_item ::= expression column_alias",
- /*  83 */ "select_item ::= expression AS column_alias",
- /*  84 */ "select_item ::= table_name NK_DOT NK_STAR",
- /*  85 */ "where_clause_opt ::=",
- /*  86 */ "where_clause_opt ::= WHERE search_condition",
- /*  87 */ "partition_by_clause_opt ::=",
- /*  88 */ "partition_by_clause_opt ::= PARTITION BY expression_list",
- /*  89 */ "twindow_clause_opt ::=",
- /*  90 */ "twindow_clause_opt ::= SESSION NK_LP column_reference NK_COMMA NK_INTEGER NK_RP",
- /*  91 */ "twindow_clause_opt ::= STATE_WINDOW NK_LP column_reference NK_RP",
- /*  92 */ "twindow_clause_opt ::= INTERVAL NK_LP duration_literal NK_RP sliding_opt fill_opt",
- /*  93 */ "twindow_clause_opt ::= INTERVAL NK_LP duration_literal NK_COMMA duration_literal NK_RP sliding_opt fill_opt",
- /*  94 */ "sliding_opt ::=",
- /*  95 */ "sliding_opt ::= SLIDING NK_LP duration_literal NK_RP",
- /*  96 */ "fill_opt ::=",
- /*  97 */ "fill_opt ::= FILL NK_LP fill_mode NK_RP",
- /*  98 */ "fill_opt ::= FILL NK_LP VALUE NK_COMMA literal_list NK_RP",
- /*  99 */ "fill_mode ::= NONE",
- /* 100 */ "fill_mode ::= PREV",
- /* 101 */ "fill_mode ::= NULL",
- /* 102 */ "fill_mode ::= LINEAR",
- /* 103 */ "fill_mode ::= NEXT",
- /* 104 */ "group_by_clause_opt ::=",
- /* 105 */ "group_by_clause_opt ::= GROUP BY expression_list",
- /* 106 */ "having_clause_opt ::=",
- /* 107 */ "having_clause_opt ::= HAVING search_condition",
- /* 108 */ "query_expression ::= query_expression_body order_by_clause_opt slimit_clause_opt limit_clause_opt",
- /* 109 */ "query_expression_body ::= query_primary",
- /* 110 */ "query_expression_body ::= query_expression_body UNION ALL query_expression_body",
- /* 111 */ "query_primary ::= query_specification",
- /* 112 */ "query_primary ::= NK_LP query_expression_body order_by_clause_opt limit_clause_opt slimit_clause_opt NK_RP",
+ /*  66 */ "table_primary ::= parenthesized_joined_table",
+ /*  67 */ "alias_opt ::=",
+ /*  68 */ "alias_opt ::= table_alias",
+ /*  69 */ "alias_opt ::= AS table_alias",
+ /*  70 */ "parenthesized_joined_table ::= NK_LP joined_table NK_RP",
+ /*  71 */ "parenthesized_joined_table ::= NK_LP parenthesized_joined_table NK_RP",
+ /*  72 */ "joined_table ::= table_reference join_type JOIN table_reference ON search_condition",
+ /*  73 */ "join_type ::= INNER",
+ /*  74 */ "query_specification ::= SELECT set_quantifier_opt select_list from_clause where_clause_opt partition_by_clause_opt twindow_clause_opt group_by_clause_opt having_clause_opt",
+ /*  75 */ "set_quantifier_opt ::=",
+ /*  76 */ "set_quantifier_opt ::= DISTINCT",
+ /*  77 */ "set_quantifier_opt ::= ALL",
+ /*  78 */ "select_list ::= NK_STAR",
+ /*  79 */ "select_list ::= select_sublist",
+ /*  80 */ "select_sublist ::= select_item",
+ /*  81 */ "select_sublist ::= select_sublist NK_COMMA select_item",
+ /*  82 */ "select_item ::= expression",
+ /*  83 */ "select_item ::= expression column_alias",
+ /*  84 */ "select_item ::= expression AS column_alias",
+ /*  85 */ "select_item ::= table_name NK_DOT NK_STAR",
+ /*  86 */ "where_clause_opt ::=",
+ /*  87 */ "where_clause_opt ::= WHERE search_condition",
+ /*  88 */ "partition_by_clause_opt ::=",
+ /*  89 */ "partition_by_clause_opt ::= PARTITION BY expression_list",
+ /*  90 */ "twindow_clause_opt ::=",
+ /*  91 */ "twindow_clause_opt ::= SESSION NK_LP column_reference NK_COMMA NK_INTEGER NK_RP",
+ /*  92 */ "twindow_clause_opt ::= STATE_WINDOW NK_LP column_reference NK_RP",
+ /*  93 */ "twindow_clause_opt ::= INTERVAL NK_LP duration_literal NK_RP sliding_opt fill_opt",
+ /*  94 */ "twindow_clause_opt ::= INTERVAL NK_LP duration_literal NK_COMMA duration_literal NK_RP sliding_opt fill_opt",
+ /*  95 */ "sliding_opt ::=",
+ /*  96 */ "sliding_opt ::= SLIDING NK_LP duration_literal NK_RP",
+ /*  97 */ "fill_opt ::=",
+ /*  98 */ "fill_opt ::= FILL NK_LP fill_mode NK_RP",
+ /*  99 */ "fill_opt ::= FILL NK_LP VALUE NK_COMMA literal_list NK_RP",
+ /* 100 */ "fill_mode ::= NONE",
+ /* 101 */ "fill_mode ::= PREV",
+ /* 102 */ "fill_mode ::= NULL",
+ /* 103 */ "fill_mode ::= LINEAR",
+ /* 104 */ "fill_mode ::= NEXT",
+ /* 105 */ "group_by_clause_opt ::=",
+ /* 106 */ "group_by_clause_opt ::= GROUP BY expression_list",
+ /* 107 */ "having_clause_opt ::=",
+ /* 108 */ "having_clause_opt ::= HAVING search_condition",
+ /* 109 */ "query_expression ::= query_expression_body order_by_clause_opt slimit_clause_opt limit_clause_opt",
+ /* 110 */ "query_expression_body ::= query_primary",
+ /* 111 */ "query_expression_body ::= query_expression_body UNION ALL query_expression_body",
+ /* 112 */ "query_primary ::= query_specification",
  /* 113 */ "order_by_clause_opt ::=",
  /* 114 */ "order_by_clause_opt ::= ORDER BY sort_specification_list",
  /* 115 */ "slimit_clause_opt ::=",
@@ -769,7 +771,7 @@ static const char *const yyRuleName[] = {
  /* 120 */ "limit_clause_opt ::= LIMIT NK_INTEGER",
  /* 121 */ "limit_clause_opt ::= LIMIT NK_INTEGER OFFSET NK_INTEGER",
  /* 122 */ "limit_clause_opt ::= LIMIT NK_INTEGER NK_COMMA NK_INTEGER",
- /* 123 */ "subquery ::= NK_LR query_expression NK_RP",
+ /* 123 */ "subquery ::= NK_LP query_expression NK_RP",
  /* 124 */ "search_condition ::= boolean_value_expression",
  /* 125 */ "sort_specification_list ::= sort_specification",
  /* 126 */ "sort_specification_list ::= sort_specification_list NK_COMMA sort_specification",
@@ -780,7 +782,6 @@ static const char *const yyRuleName[] = {
  /* 131 */ "null_ordering_opt ::=",
  /* 132 */ "null_ordering_opt ::= NULLS FIRST",
  /* 133 */ "null_ordering_opt ::= NULLS LAST",
- /* 134 */ "table_primary ::= parenthesized_joined_table",
 };
 #endif /* NDEBUG */
 
@@ -907,90 +908,90 @@ static void yy_destructor(
     */
 /********* Begin destructor definitions ***************************************/
       /* Default NON-TERMINAL Destructor */
-    case 73: /* cmd */
-    case 74: /* query_expression */
-    case 75: /* literal */
-    case 76: /* duration_literal */
-    case 84: /* expression */
-    case 85: /* column_reference */
-    case 87: /* subquery */
-    case 88: /* predicate */
-    case 91: /* in_predicate_value */
-    case 92: /* boolean_value_expression */
-    case 93: /* boolean_primary */
-    case 94: /* from_clause */
-    case 95: /* table_reference_list */
-    case 96: /* table_reference */
-    case 97: /* table_primary */
-    case 98: /* joined_table */
-    case 100: /* parenthesized_joined_table */
-    case 102: /* search_condition */
-    case 103: /* query_specification */
-    case 106: /* where_clause_opt */
-    case 108: /* twindow_clause_opt */
-    case 110: /* having_clause_opt */
-    case 112: /* select_item */
-    case 113: /* sliding_opt */
-    case 114: /* fill_opt */
-    case 116: /* query_expression_body */
-    case 118: /* slimit_clause_opt */
-    case 119: /* limit_clause_opt */
-    case 120: /* query_primary */
-    case 122: /* sort_specification */
+    case 72: /* cmd */
+    case 73: /* query_expression */
+    case 74: /* literal */
+    case 75: /* duration_literal */
+    case 83: /* expression */
+    case 84: /* column_reference */
+    case 86: /* subquery */
+    case 87: /* predicate */
+    case 90: /* in_predicate_value */
+    case 91: /* boolean_value_expression */
+    case 92: /* boolean_primary */
+    case 93: /* from_clause */
+    case 94: /* table_reference_list */
+    case 95: /* table_reference */
+    case 96: /* table_primary */
+    case 97: /* joined_table */
+    case 99: /* parenthesized_joined_table */
+    case 101: /* search_condition */
+    case 102: /* query_specification */
+    case 105: /* where_clause_opt */
+    case 107: /* twindow_clause_opt */
+    case 109: /* having_clause_opt */
+    case 111: /* select_item */
+    case 112: /* sliding_opt */
+    case 113: /* fill_opt */
+    case 115: /* query_expression_body */
+    case 117: /* slimit_clause_opt */
+    case 118: /* limit_clause_opt */
+    case 119: /* query_primary */
+    case 121: /* sort_specification */
 {
- PARSER_DESTRUCTOR_TRACE; nodesDestroyNode((yypminor->yy212)); 
+ PARSER_DESTRUCTOR_TRACE; nodesDestroyNode((yypminor->yy168)); 
 }
       break;
-    case 77: /* literal_list */
-    case 86: /* expression_list */
-    case 105: /* select_list */
-    case 107: /* partition_by_clause_opt */
-    case 109: /* group_by_clause_opt */
-    case 111: /* select_sublist */
-    case 117: /* order_by_clause_opt */
-    case 121: /* sort_specification_list */
+    case 76: /* literal_list */
+    case 85: /* expression_list */
+    case 104: /* select_list */
+    case 106: /* partition_by_clause_opt */
+    case 108: /* group_by_clause_opt */
+    case 110: /* select_sublist */
+    case 116: /* order_by_clause_opt */
+    case 120: /* sort_specification_list */
 {
- PARSER_DESTRUCTOR_TRACE; nodesDestroyList((yypminor->yy174)); 
+ PARSER_DESTRUCTOR_TRACE; nodesDestroyList((yypminor->yy192)); 
 }
       break;
-    case 78: /* db_name */
-    case 79: /* table_name */
-    case 80: /* column_name */
-    case 81: /* function_name */
-    case 82: /* table_alias */
-    case 83: /* column_alias */
-    case 99: /* alias_opt */
+    case 77: /* db_name */
+    case 78: /* table_name */
+    case 79: /* column_name */
+    case 80: /* function_name */
+    case 81: /* table_alias */
+    case 82: /* column_alias */
+    case 98: /* alias_opt */
 {
  PARSER_DESTRUCTOR_TRACE; 
 }
       break;
-    case 89: /* compare_op */
-    case 90: /* in_op */
+    case 88: /* compare_op */
+    case 89: /* in_op */
 {
  PARSER_DESTRUCTOR_TRACE; 
 }
       break;
-    case 101: /* join_type */
+    case 100: /* join_type */
 {
  PARSER_DESTRUCTOR_TRACE; 
 }
       break;
-    case 104: /* set_quantifier_opt */
+    case 103: /* set_quantifier_opt */
 {
  PARSER_DESTRUCTOR_TRACE; 
 }
       break;
-    case 115: /* fill_mode */
+    case 114: /* fill_mode */
 {
  PARSER_DESTRUCTOR_TRACE; 
 }
       break;
-    case 123: /* ordering_specification_opt */
+    case 122: /* ordering_specification_opt */
 {
  PARSER_DESTRUCTOR_TRACE; 
 }
       break;
-    case 124: /* null_ordering_opt */
+    case 123: /* null_ordering_opt */
 {
  PARSER_DESTRUCTOR_TRACE; 
 }
@@ -1289,141 +1290,140 @@ static const struct {
   YYCODETYPE lhs;       /* Symbol on the left-hand side of the rule */
   signed char nrhs;     /* Negative of the number of RHS symbols in the rule */
 } yyRuleInfo[] = {
-  {   73,   -2 }, /* (0) cmd ::= SHOW DATABASES */
-  {   73,   -1 }, /* (1) cmd ::= query_expression */
-  {   75,   -1 }, /* (2) literal ::= NK_INTEGER */
-  {   75,   -1 }, /* (3) literal ::= NK_FLOAT */
-  {   75,   -1 }, /* (4) literal ::= NK_STRING */
-  {   75,   -1 }, /* (5) literal ::= NK_BOOL */
-  {   75,   -2 }, /* (6) literal ::= TIMESTAMP NK_STRING */
-  {   75,   -1 }, /* (7) literal ::= duration_literal */
-  {   76,   -1 }, /* (8) duration_literal ::= NK_VARIABLE */
-  {   77,   -1 }, /* (9) literal_list ::= literal */
-  {   77,   -3 }, /* (10) literal_list ::= literal_list NK_COMMA literal */
-  {   78,   -1 }, /* (11) db_name ::= NK_ID */
-  {   79,   -1 }, /* (12) table_name ::= NK_ID */
-  {   80,   -1 }, /* (13) column_name ::= NK_ID */
-  {   81,   -1 }, /* (14) function_name ::= NK_ID */
-  {   82,   -1 }, /* (15) table_alias ::= NK_ID */
-  {   83,   -1 }, /* (16) column_alias ::= NK_ID */
-  {   84,   -1 }, /* (17) expression ::= literal */
-  {   84,   -1 }, /* (18) expression ::= column_reference */
-  {   84,   -4 }, /* (19) expression ::= function_name NK_LP expression_list NK_RP */
-  {   84,   -1 }, /* (20) expression ::= subquery */
-  {   84,   -3 }, /* (21) expression ::= NK_LP expression NK_RP */
-  {   84,   -2 }, /* (22) expression ::= NK_PLUS expression */
-  {   84,   -2 }, /* (23) expression ::= NK_MINUS expression */
-  {   84,   -3 }, /* (24) expression ::= expression NK_PLUS expression */
-  {   84,   -3 }, /* (25) expression ::= expression NK_MINUS expression */
-  {   84,   -3 }, /* (26) expression ::= expression NK_STAR expression */
-  {   84,   -3 }, /* (27) expression ::= expression NK_SLASH expression */
-  {   84,   -3 }, /* (28) expression ::= expression NK_REM expression */
-  {   86,   -1 }, /* (29) expression_list ::= expression */
-  {   86,   -3 }, /* (30) expression_list ::= expression_list NK_COMMA expression */
-  {   85,   -1 }, /* (31) column_reference ::= column_name */
-  {   85,   -3 }, /* (32) column_reference ::= table_name NK_DOT column_name */
-  {   88,   -3 }, /* (33) predicate ::= expression compare_op expression */
-  {   88,   -5 }, /* (34) predicate ::= expression BETWEEN expression AND expression */
-  {   88,   -6 }, /* (35) predicate ::= expression NOT BETWEEN expression AND expression */
-  {   88,   -3 }, /* (36) predicate ::= expression IS NULL */
-  {   88,   -4 }, /* (37) predicate ::= expression IS NOT NULL */
-  {   88,   -3 }, /* (38) predicate ::= expression in_op in_predicate_value */
-  {   89,   -1 }, /* (39) compare_op ::= NK_LT */
-  {   89,   -1 }, /* (40) compare_op ::= NK_GT */
-  {   89,   -1 }, /* (41) compare_op ::= NK_LE */
-  {   89,   -1 }, /* (42) compare_op ::= NK_GE */
-  {   89,   -1 }, /* (43) compare_op ::= NK_NE */
-  {   89,   -1 }, /* (44) compare_op ::= NK_EQ */
-  {   89,   -1 }, /* (45) compare_op ::= LIKE */
-  {   89,   -2 }, /* (46) compare_op ::= NOT LIKE */
-  {   89,   -1 }, /* (47) compare_op ::= MATCH */
-  {   89,   -1 }, /* (48) compare_op ::= NMATCH */
-  {   90,   -1 }, /* (49) in_op ::= IN */
-  {   90,   -2 }, /* (50) in_op ::= NOT IN */
-  {   91,   -3 }, /* (51) in_predicate_value ::= NK_LP expression_list NK_RP */
-  {   92,   -1 }, /* (52) boolean_value_expression ::= boolean_primary */
-  {   92,   -2 }, /* (53) boolean_value_expression ::= NOT boolean_primary */
-  {   92,   -3 }, /* (54) boolean_value_expression ::= boolean_value_expression OR boolean_value_expression */
-  {   92,   -3 }, /* (55) boolean_value_expression ::= boolean_value_expression AND boolean_value_expression */
-  {   93,   -1 }, /* (56) boolean_primary ::= predicate */
-  {   93,   -3 }, /* (57) boolean_primary ::= NK_LP boolean_value_expression NK_RP */
-  {   94,   -2 }, /* (58) from_clause ::= FROM table_reference_list */
-  {   95,   -1 }, /* (59) table_reference_list ::= table_reference */
-  {   95,   -3 }, /* (60) table_reference_list ::= table_reference_list NK_COMMA table_reference */
-  {   96,   -1 }, /* (61) table_reference ::= table_primary */
-  {   96,   -1 }, /* (62) table_reference ::= joined_table */
-  {   97,   -2 }, /* (63) table_primary ::= table_name alias_opt */
-  {   97,   -4 }, /* (64) table_primary ::= db_name NK_DOT table_name alias_opt */
-  {   97,   -2 }, /* (65) table_primary ::= subquery alias_opt */
-  {   99,    0 }, /* (66) alias_opt ::= */
-  {   99,   -1 }, /* (67) alias_opt ::= table_alias */
-  {   99,   -2 }, /* (68) alias_opt ::= AS table_alias */
-  {  100,   -3 }, /* (69) parenthesized_joined_table ::= NK_LP joined_table NK_RP */
-  {  100,   -3 }, /* (70) parenthesized_joined_table ::= NK_LP parenthesized_joined_table NK_RP */
-  {   98,   -6 }, /* (71) joined_table ::= table_reference join_type JOIN table_reference ON search_condition */
-  {  101,   -1 }, /* (72) join_type ::= INNER */
-  {  103,   -9 }, /* (73) query_specification ::= SELECT set_quantifier_opt select_list from_clause where_clause_opt partition_by_clause_opt twindow_clause_opt group_by_clause_opt having_clause_opt */
-  {  104,    0 }, /* (74) set_quantifier_opt ::= */
-  {  104,   -1 }, /* (75) set_quantifier_opt ::= DISTINCT */
-  {  104,   -1 }, /* (76) set_quantifier_opt ::= ALL */
-  {  105,   -1 }, /* (77) select_list ::= NK_STAR */
-  {  105,   -1 }, /* (78) select_list ::= select_sublist */
-  {  111,   -1 }, /* (79) select_sublist ::= select_item */
-  {  111,   -3 }, /* (80) select_sublist ::= select_sublist NK_COMMA select_item */
-  {  112,   -1 }, /* (81) select_item ::= expression */
-  {  112,   -2 }, /* (82) select_item ::= expression column_alias */
-  {  112,   -3 }, /* (83) select_item ::= expression AS column_alias */
-  {  112,   -3 }, /* (84) select_item ::= table_name NK_DOT NK_STAR */
-  {  106,    0 }, /* (85) where_clause_opt ::= */
-  {  106,   -2 }, /* (86) where_clause_opt ::= WHERE search_condition */
-  {  107,    0 }, /* (87) partition_by_clause_opt ::= */
-  {  107,   -3 }, /* (88) partition_by_clause_opt ::= PARTITION BY expression_list */
-  {  108,    0 }, /* (89) twindow_clause_opt ::= */
-  {  108,   -6 }, /* (90) twindow_clause_opt ::= SESSION NK_LP column_reference NK_COMMA NK_INTEGER NK_RP */
-  {  108,   -4 }, /* (91) twindow_clause_opt ::= STATE_WINDOW NK_LP column_reference NK_RP */
-  {  108,   -6 }, /* (92) twindow_clause_opt ::= INTERVAL NK_LP duration_literal NK_RP sliding_opt fill_opt */
-  {  108,   -8 }, /* (93) twindow_clause_opt ::= INTERVAL NK_LP duration_literal NK_COMMA duration_literal NK_RP sliding_opt fill_opt */
-  {  113,    0 }, /* (94) sliding_opt ::= */
-  {  113,   -4 }, /* (95) sliding_opt ::= SLIDING NK_LP duration_literal NK_RP */
-  {  114,    0 }, /* (96) fill_opt ::= */
-  {  114,   -4 }, /* (97) fill_opt ::= FILL NK_LP fill_mode NK_RP */
-  {  114,   -6 }, /* (98) fill_opt ::= FILL NK_LP VALUE NK_COMMA literal_list NK_RP */
-  {  115,   -1 }, /* (99) fill_mode ::= NONE */
-  {  115,   -1 }, /* (100) fill_mode ::= PREV */
-  {  115,   -1 }, /* (101) fill_mode ::= NULL */
-  {  115,   -1 }, /* (102) fill_mode ::= LINEAR */
-  {  115,   -1 }, /* (103) fill_mode ::= NEXT */
-  {  109,    0 }, /* (104) group_by_clause_opt ::= */
-  {  109,   -3 }, /* (105) group_by_clause_opt ::= GROUP BY expression_list */
-  {  110,    0 }, /* (106) having_clause_opt ::= */
-  {  110,   -2 }, /* (107) having_clause_opt ::= HAVING search_condition */
-  {   74,   -4 }, /* (108) query_expression ::= query_expression_body order_by_clause_opt slimit_clause_opt limit_clause_opt */
-  {  116,   -1 }, /* (109) query_expression_body ::= query_primary */
-  {  116,   -4 }, /* (110) query_expression_body ::= query_expression_body UNION ALL query_expression_body */
-  {  120,   -1 }, /* (111) query_primary ::= query_specification */
-  {  120,   -6 }, /* (112) query_primary ::= NK_LP query_expression_body order_by_clause_opt limit_clause_opt slimit_clause_opt NK_RP */
-  {  117,    0 }, /* (113) order_by_clause_opt ::= */
-  {  117,   -3 }, /* (114) order_by_clause_opt ::= ORDER BY sort_specification_list */
-  {  118,    0 }, /* (115) slimit_clause_opt ::= */
-  {  118,   -2 }, /* (116) slimit_clause_opt ::= SLIMIT NK_INTEGER */
-  {  118,   -4 }, /* (117) slimit_clause_opt ::= SLIMIT NK_INTEGER SOFFSET NK_INTEGER */
-  {  118,   -4 }, /* (118) slimit_clause_opt ::= SLIMIT NK_INTEGER NK_COMMA NK_INTEGER */
-  {  119,    0 }, /* (119) limit_clause_opt ::= */
-  {  119,   -2 }, /* (120) limit_clause_opt ::= LIMIT NK_INTEGER */
-  {  119,   -4 }, /* (121) limit_clause_opt ::= LIMIT NK_INTEGER OFFSET NK_INTEGER */
-  {  119,   -4 }, /* (122) limit_clause_opt ::= LIMIT NK_INTEGER NK_COMMA NK_INTEGER */
-  {   87,   -3 }, /* (123) subquery ::= NK_LR query_expression NK_RP */
-  {  102,   -1 }, /* (124) search_condition ::= boolean_value_expression */
-  {  121,   -1 }, /* (125) sort_specification_list ::= sort_specification */
-  {  121,   -3 }, /* (126) sort_specification_list ::= sort_specification_list NK_COMMA sort_specification */
-  {  122,   -3 }, /* (127) sort_specification ::= expression ordering_specification_opt null_ordering_opt */
-  {  123,    0 }, /* (128) ordering_specification_opt ::= */
-  {  123,   -1 }, /* (129) ordering_specification_opt ::= ASC */
-  {  123,   -1 }, /* (130) ordering_specification_opt ::= DESC */
-  {  124,    0 }, /* (131) null_ordering_opt ::= */
-  {  124,   -2 }, /* (132) null_ordering_opt ::= NULLS FIRST */
-  {  124,   -2 }, /* (133) null_ordering_opt ::= NULLS LAST */
-  {   97,   -1 }, /* (134) table_primary ::= parenthesized_joined_table */
+  {   72,   -2 }, /* (0) cmd ::= SHOW DATABASES */
+  {   72,   -1 }, /* (1) cmd ::= query_expression */
+  {   74,   -1 }, /* (2) literal ::= NK_INTEGER */
+  {   74,   -1 }, /* (3) literal ::= NK_FLOAT */
+  {   74,   -1 }, /* (4) literal ::= NK_STRING */
+  {   74,   -1 }, /* (5) literal ::= NK_BOOL */
+  {   74,   -2 }, /* (6) literal ::= TIMESTAMP NK_STRING */
+  {   74,   -1 }, /* (7) literal ::= duration_literal */
+  {   75,   -1 }, /* (8) duration_literal ::= NK_VARIABLE */
+  {   76,   -1 }, /* (9) literal_list ::= literal */
+  {   76,   -3 }, /* (10) literal_list ::= literal_list NK_COMMA literal */
+  {   77,   -1 }, /* (11) db_name ::= NK_ID */
+  {   78,   -1 }, /* (12) table_name ::= NK_ID */
+  {   79,   -1 }, /* (13) column_name ::= NK_ID */
+  {   80,   -1 }, /* (14) function_name ::= NK_ID */
+  {   81,   -1 }, /* (15) table_alias ::= NK_ID */
+  {   82,   -1 }, /* (16) column_alias ::= NK_ID */
+  {   83,   -1 }, /* (17) expression ::= literal */
+  {   83,   -1 }, /* (18) expression ::= column_reference */
+  {   83,   -4 }, /* (19) expression ::= function_name NK_LP expression_list NK_RP */
+  {   83,   -1 }, /* (20) expression ::= subquery */
+  {   83,   -3 }, /* (21) expression ::= NK_LP expression NK_RP */
+  {   83,   -2 }, /* (22) expression ::= NK_PLUS expression */
+  {   83,   -2 }, /* (23) expression ::= NK_MINUS expression */
+  {   83,   -3 }, /* (24) expression ::= expression NK_PLUS expression */
+  {   83,   -3 }, /* (25) expression ::= expression NK_MINUS expression */
+  {   83,   -3 }, /* (26) expression ::= expression NK_STAR expression */
+  {   83,   -3 }, /* (27) expression ::= expression NK_SLASH expression */
+  {   83,   -3 }, /* (28) expression ::= expression NK_REM expression */
+  {   85,   -1 }, /* (29) expression_list ::= expression */
+  {   85,   -3 }, /* (30) expression_list ::= expression_list NK_COMMA expression */
+  {   84,   -1 }, /* (31) column_reference ::= column_name */
+  {   84,   -3 }, /* (32) column_reference ::= table_name NK_DOT column_name */
+  {   87,   -3 }, /* (33) predicate ::= expression compare_op expression */
+  {   87,   -5 }, /* (34) predicate ::= expression BETWEEN expression AND expression */
+  {   87,   -6 }, /* (35) predicate ::= expression NOT BETWEEN expression AND expression */
+  {   87,   -3 }, /* (36) predicate ::= expression IS NULL */
+  {   87,   -4 }, /* (37) predicate ::= expression IS NOT NULL */
+  {   87,   -3 }, /* (38) predicate ::= expression in_op in_predicate_value */
+  {   88,   -1 }, /* (39) compare_op ::= NK_LT */
+  {   88,   -1 }, /* (40) compare_op ::= NK_GT */
+  {   88,   -1 }, /* (41) compare_op ::= NK_LE */
+  {   88,   -1 }, /* (42) compare_op ::= NK_GE */
+  {   88,   -1 }, /* (43) compare_op ::= NK_NE */
+  {   88,   -1 }, /* (44) compare_op ::= NK_EQ */
+  {   88,   -1 }, /* (45) compare_op ::= LIKE */
+  {   88,   -2 }, /* (46) compare_op ::= NOT LIKE */
+  {   88,   -1 }, /* (47) compare_op ::= MATCH */
+  {   88,   -1 }, /* (48) compare_op ::= NMATCH */
+  {   89,   -1 }, /* (49) in_op ::= IN */
+  {   89,   -2 }, /* (50) in_op ::= NOT IN */
+  {   90,   -3 }, /* (51) in_predicate_value ::= NK_LP expression_list NK_RP */
+  {   91,   -1 }, /* (52) boolean_value_expression ::= boolean_primary */
+  {   91,   -2 }, /* (53) boolean_value_expression ::= NOT boolean_primary */
+  {   91,   -3 }, /* (54) boolean_value_expression ::= boolean_value_expression OR boolean_value_expression */
+  {   91,   -3 }, /* (55) boolean_value_expression ::= boolean_value_expression AND boolean_value_expression */
+  {   92,   -1 }, /* (56) boolean_primary ::= predicate */
+  {   92,   -3 }, /* (57) boolean_primary ::= NK_LP boolean_value_expression NK_RP */
+  {   93,   -2 }, /* (58) from_clause ::= FROM table_reference_list */
+  {   94,   -1 }, /* (59) table_reference_list ::= table_reference */
+  {   94,   -3 }, /* (60) table_reference_list ::= table_reference_list NK_COMMA table_reference */
+  {   95,   -1 }, /* (61) table_reference ::= table_primary */
+  {   95,   -1 }, /* (62) table_reference ::= joined_table */
+  {   96,   -2 }, /* (63) table_primary ::= table_name alias_opt */
+  {   96,   -4 }, /* (64) table_primary ::= db_name NK_DOT table_name alias_opt */
+  {   96,   -2 }, /* (65) table_primary ::= subquery alias_opt */
+  {   96,   -1 }, /* (66) table_primary ::= parenthesized_joined_table */
+  {   98,    0 }, /* (67) alias_opt ::= */
+  {   98,   -1 }, /* (68) alias_opt ::= table_alias */
+  {   98,   -2 }, /* (69) alias_opt ::= AS table_alias */
+  {   99,   -3 }, /* (70) parenthesized_joined_table ::= NK_LP joined_table NK_RP */
+  {   99,   -3 }, /* (71) parenthesized_joined_table ::= NK_LP parenthesized_joined_table NK_RP */
+  {   97,   -6 }, /* (72) joined_table ::= table_reference join_type JOIN table_reference ON search_condition */
+  {  100,   -1 }, /* (73) join_type ::= INNER */
+  {  102,   -9 }, /* (74) query_specification ::= SELECT set_quantifier_opt select_list from_clause where_clause_opt partition_by_clause_opt twindow_clause_opt group_by_clause_opt having_clause_opt */
+  {  103,    0 }, /* (75) set_quantifier_opt ::= */
+  {  103,   -1 }, /* (76) set_quantifier_opt ::= DISTINCT */
+  {  103,   -1 }, /* (77) set_quantifier_opt ::= ALL */
+  {  104,   -1 }, /* (78) select_list ::= NK_STAR */
+  {  104,   -1 }, /* (79) select_list ::= select_sublist */
+  {  110,   -1 }, /* (80) select_sublist ::= select_item */
+  {  110,   -3 }, /* (81) select_sublist ::= select_sublist NK_COMMA select_item */
+  {  111,   -1 }, /* (82) select_item ::= expression */
+  {  111,   -2 }, /* (83) select_item ::= expression column_alias */
+  {  111,   -3 }, /* (84) select_item ::= expression AS column_alias */
+  {  111,   -3 }, /* (85) select_item ::= table_name NK_DOT NK_STAR */
+  {  105,    0 }, /* (86) where_clause_opt ::= */
+  {  105,   -2 }, /* (87) where_clause_opt ::= WHERE search_condition */
+  {  106,    0 }, /* (88) partition_by_clause_opt ::= */
+  {  106,   -3 }, /* (89) partition_by_clause_opt ::= PARTITION BY expression_list */
+  {  107,    0 }, /* (90) twindow_clause_opt ::= */
+  {  107,   -6 }, /* (91) twindow_clause_opt ::= SESSION NK_LP column_reference NK_COMMA NK_INTEGER NK_RP */
+  {  107,   -4 }, /* (92) twindow_clause_opt ::= STATE_WINDOW NK_LP column_reference NK_RP */
+  {  107,   -6 }, /* (93) twindow_clause_opt ::= INTERVAL NK_LP duration_literal NK_RP sliding_opt fill_opt */
+  {  107,   -8 }, /* (94) twindow_clause_opt ::= INTERVAL NK_LP duration_literal NK_COMMA duration_literal NK_RP sliding_opt fill_opt */
+  {  112,    0 }, /* (95) sliding_opt ::= */
+  {  112,   -4 }, /* (96) sliding_opt ::= SLIDING NK_LP duration_literal NK_RP */
+  {  113,    0 }, /* (97) fill_opt ::= */
+  {  113,   -4 }, /* (98) fill_opt ::= FILL NK_LP fill_mode NK_RP */
+  {  113,   -6 }, /* (99) fill_opt ::= FILL NK_LP VALUE NK_COMMA literal_list NK_RP */
+  {  114,   -1 }, /* (100) fill_mode ::= NONE */
+  {  114,   -1 }, /* (101) fill_mode ::= PREV */
+  {  114,   -1 }, /* (102) fill_mode ::= NULL */
+  {  114,   -1 }, /* (103) fill_mode ::= LINEAR */
+  {  114,   -1 }, /* (104) fill_mode ::= NEXT */
+  {  108,    0 }, /* (105) group_by_clause_opt ::= */
+  {  108,   -3 }, /* (106) group_by_clause_opt ::= GROUP BY expression_list */
+  {  109,    0 }, /* (107) having_clause_opt ::= */
+  {  109,   -2 }, /* (108) having_clause_opt ::= HAVING search_condition */
+  {   73,   -4 }, /* (109) query_expression ::= query_expression_body order_by_clause_opt slimit_clause_opt limit_clause_opt */
+  {  115,   -1 }, /* (110) query_expression_body ::= query_primary */
+  {  115,   -4 }, /* (111) query_expression_body ::= query_expression_body UNION ALL query_expression_body */
+  {  119,   -1 }, /* (112) query_primary ::= query_specification */
+  {  116,    0 }, /* (113) order_by_clause_opt ::= */
+  {  116,   -3 }, /* (114) order_by_clause_opt ::= ORDER BY sort_specification_list */
+  {  117,    0 }, /* (115) slimit_clause_opt ::= */
+  {  117,   -2 }, /* (116) slimit_clause_opt ::= SLIMIT NK_INTEGER */
+  {  117,   -4 }, /* (117) slimit_clause_opt ::= SLIMIT NK_INTEGER SOFFSET NK_INTEGER */
+  {  117,   -4 }, /* (118) slimit_clause_opt ::= SLIMIT NK_INTEGER NK_COMMA NK_INTEGER */
+  {  118,    0 }, /* (119) limit_clause_opt ::= */
+  {  118,   -2 }, /* (120) limit_clause_opt ::= LIMIT NK_INTEGER */
+  {  118,   -4 }, /* (121) limit_clause_opt ::= LIMIT NK_INTEGER OFFSET NK_INTEGER */
+  {  118,   -4 }, /* (122) limit_clause_opt ::= LIMIT NK_INTEGER NK_COMMA NK_INTEGER */
+  {   86,   -3 }, /* (123) subquery ::= NK_LP query_expression NK_RP */
+  {  101,   -1 }, /* (124) search_condition ::= boolean_value_expression */
+  {  120,   -1 }, /* (125) sort_specification_list ::= sort_specification */
+  {  120,   -3 }, /* (126) sort_specification_list ::= sort_specification_list NK_COMMA sort_specification */
+  {  121,   -3 }, /* (127) sort_specification ::= expression ordering_specification_opt null_ordering_opt */
+  {  122,    0 }, /* (128) ordering_specification_opt ::= */
+  {  122,   -1 }, /* (129) ordering_specification_opt ::= ASC */
+  {  122,   -1 }, /* (130) ordering_specification_opt ::= DESC */
+  {  123,    0 }, /* (131) null_ordering_opt ::= */
+  {  123,   -2 }, /* (132) null_ordering_opt ::= NULLS FIRST */
+  {  123,   -2 }, /* (133) null_ordering_opt ::= NULLS LAST */
 };
 
 static void yy_accept(yyParser*);  /* Forward Declaration */
@@ -1514,26 +1514,26 @@ static YYACTIONTYPE yy_reduce(
 { PARSER_TRACE; createShowStmt(pCxt, SHOW_TYPE_DATABASE); }
         break;
       case 1: /* cmd ::= query_expression */
-{ PARSER_TRACE; pCxt->pRootNode = yymsp[0].minor.yy212; }
+{ PARSER_TRACE; pCxt->pRootNode = yymsp[0].minor.yy168; }
         break;
       case 2: /* literal ::= NK_INTEGER */
-{ PARSER_TRACE; yylhsminor.yy212 = createValueNode(pCxt, TSDB_DATA_TYPE_BIGINT, &yymsp[0].minor.yy0); }
-  yymsp[0].minor.yy212 = yylhsminor.yy212;
+{ PARSER_TRACE; yylhsminor.yy168 = createValueNode(pCxt, TSDB_DATA_TYPE_BIGINT, &yymsp[0].minor.yy0); }
+  yymsp[0].minor.yy168 = yylhsminor.yy168;
         break;
       case 3: /* literal ::= NK_FLOAT */
-{ PARSER_TRACE; yylhsminor.yy212 = createValueNode(pCxt, TSDB_DATA_TYPE_DOUBLE, &yymsp[0].minor.yy0); }
-  yymsp[0].minor.yy212 = yylhsminor.yy212;
+{ PARSER_TRACE; yylhsminor.yy168 = createValueNode(pCxt, TSDB_DATA_TYPE_DOUBLE, &yymsp[0].minor.yy0); }
+  yymsp[0].minor.yy168 = yylhsminor.yy168;
         break;
       case 4: /* literal ::= NK_STRING */
-{ PARSER_TRACE; yylhsminor.yy212 = createValueNode(pCxt, TSDB_DATA_TYPE_BINARY, &yymsp[0].minor.yy0); }
-  yymsp[0].minor.yy212 = yylhsminor.yy212;
+{ PARSER_TRACE; yylhsminor.yy168 = createValueNode(pCxt, TSDB_DATA_TYPE_BINARY, &yymsp[0].minor.yy0); }
+  yymsp[0].minor.yy168 = yylhsminor.yy168;
         break;
       case 5: /* literal ::= NK_BOOL */
-{ PARSER_TRACE; yylhsminor.yy212 = createValueNode(pCxt, TSDB_DATA_TYPE_BOOL, &yymsp[0].minor.yy0); }
-  yymsp[0].minor.yy212 = yylhsminor.yy212;
+{ PARSER_TRACE; yylhsminor.yy168 = createValueNode(pCxt, TSDB_DATA_TYPE_BOOL, &yymsp[0].minor.yy0); }
+  yymsp[0].minor.yy168 = yylhsminor.yy168;
         break;
       case 6: /* literal ::= TIMESTAMP NK_STRING */
-{ PARSER_TRACE; yymsp[-1].minor.yy212 = createValueNode(pCxt, TSDB_DATA_TYPE_TIMESTAMP, &yymsp[0].minor.yy0); }
+{ PARSER_TRACE; yymsp[-1].minor.yy168 = createValueNode(pCxt, TSDB_DATA_TYPE_TIMESTAMP, &yymsp[0].minor.yy0); }
         break;
       case 7: /* literal ::= duration_literal */
       case 17: /* expression ::= literal */ yytestcase(yyruleno==17);
@@ -1544,30 +1544,31 @@ static YYACTIONTYPE yy_reduce(
       case 59: /* table_reference_list ::= table_reference */ yytestcase(yyruleno==59);
       case 61: /* table_reference ::= table_primary */ yytestcase(yyruleno==61);
       case 62: /* table_reference ::= joined_table */ yytestcase(yyruleno==62);
-      case 81: /* select_item ::= expression */ yytestcase(yyruleno==81);
-      case 109: /* query_expression_body ::= query_primary */ yytestcase(yyruleno==109);
-      case 111: /* query_primary ::= query_specification */ yytestcase(yyruleno==111);
+      case 66: /* table_primary ::= parenthesized_joined_table */ yytestcase(yyruleno==66);
+      case 82: /* select_item ::= expression */ yytestcase(yyruleno==82);
+      case 110: /* query_expression_body ::= query_primary */ yytestcase(yyruleno==110);
+      case 112: /* query_primary ::= query_specification */ yytestcase(yyruleno==112);
       case 124: /* search_condition ::= boolean_value_expression */ yytestcase(yyruleno==124);
-{ PARSER_TRACE; yylhsminor.yy212 = yymsp[0].minor.yy212; }
-  yymsp[0].minor.yy212 = yylhsminor.yy212;
+{ PARSER_TRACE; yylhsminor.yy168 = yymsp[0].minor.yy168; }
+  yymsp[0].minor.yy168 = yylhsminor.yy168;
         break;
       case 8: /* duration_literal ::= NK_VARIABLE */
-{ PARSER_TRACE; yylhsminor.yy212 = createDurationValueNode(pCxt, &yymsp[0].minor.yy0); }
-  yymsp[0].minor.yy212 = yylhsminor.yy212;
+{ PARSER_TRACE; yylhsminor.yy168 = createDurationValueNode(pCxt, &yymsp[0].minor.yy0); }
+  yymsp[0].minor.yy168 = yylhsminor.yy168;
         break;
       case 9: /* literal_list ::= literal */
       case 29: /* expression_list ::= expression */ yytestcase(yyruleno==29);
-      case 79: /* select_sublist ::= select_item */ yytestcase(yyruleno==79);
+      case 80: /* select_sublist ::= select_item */ yytestcase(yyruleno==80);
       case 125: /* sort_specification_list ::= sort_specification */ yytestcase(yyruleno==125);
-{ PARSER_TRACE; yylhsminor.yy174 = createNodeList(pCxt, yymsp[0].minor.yy212); }
-  yymsp[0].minor.yy174 = yylhsminor.yy174;
+{ PARSER_TRACE; yylhsminor.yy192 = createNodeList(pCxt, yymsp[0].minor.yy168); }
+  yymsp[0].minor.yy192 = yylhsminor.yy192;
         break;
       case 10: /* literal_list ::= literal_list NK_COMMA literal */
       case 30: /* expression_list ::= expression_list NK_COMMA expression */ yytestcase(yyruleno==30);
-      case 80: /* select_sublist ::= select_sublist NK_COMMA select_item */ yytestcase(yyruleno==80);
+      case 81: /* select_sublist ::= select_sublist NK_COMMA select_item */ yytestcase(yyruleno==81);
       case 126: /* sort_specification_list ::= sort_specification_list NK_COMMA sort_specification */ yytestcase(yyruleno==126);
-{ PARSER_TRACE; yylhsminor.yy174 = addNodeToList(pCxt, yymsp[-2].minor.yy174, yymsp[0].minor.yy212); }
-  yymsp[-2].minor.yy174 = yylhsminor.yy174;
+{ PARSER_TRACE; yylhsminor.yy192 = addNodeToList(pCxt, yymsp[-2].minor.yy192, yymsp[0].minor.yy168); }
+  yymsp[-2].minor.yy192 = yylhsminor.yy192;
         break;
       case 11: /* db_name ::= NK_ID */
       case 12: /* table_name ::= NK_ID */ yytestcase(yyruleno==12);
@@ -1575,313 +1576,301 @@ static YYACTIONTYPE yy_reduce(
       case 14: /* function_name ::= NK_ID */ yytestcase(yyruleno==14);
       case 15: /* table_alias ::= NK_ID */ yytestcase(yyruleno==15);
       case 16: /* column_alias ::= NK_ID */ yytestcase(yyruleno==16);
-{ PARSER_TRACE; yylhsminor.yy79 = yymsp[0].minor.yy0; }
-  yymsp[0].minor.yy79 = yylhsminor.yy79;
+{ PARSER_TRACE; yylhsminor.yy241 = yymsp[0].minor.yy0; }
+  yymsp[0].minor.yy241 = yylhsminor.yy241;
         break;
       case 19: /* expression ::= function_name NK_LP expression_list NK_RP */
-{ PARSER_TRACE; yylhsminor.yy212 = createFunctionNode(pCxt, &yymsp[-3].minor.yy79, yymsp[-1].minor.yy174); }
-  yymsp[-3].minor.yy212 = yylhsminor.yy212;
+{ PARSER_TRACE; yylhsminor.yy168 = createFunctionNode(pCxt, &yymsp[-3].minor.yy241, yymsp[-1].minor.yy192); }
+  yymsp[-3].minor.yy168 = yylhsminor.yy168;
         break;
       case 21: /* expression ::= NK_LP expression NK_RP */
       case 57: /* boolean_primary ::= NK_LP boolean_value_expression NK_RP */ yytestcase(yyruleno==57);
-      case 69: /* parenthesized_joined_table ::= NK_LP joined_table NK_RP */ yytestcase(yyruleno==69);
-      case 70: /* parenthesized_joined_table ::= NK_LP parenthesized_joined_table NK_RP */ yytestcase(yyruleno==70);
-      case 123: /* subquery ::= NK_LR query_expression NK_RP */ yytestcase(yyruleno==123);
-{ PARSER_TRACE; yymsp[-2].minor.yy212 = yymsp[-1].minor.yy212; }
+      case 70: /* parenthesized_joined_table ::= NK_LP joined_table NK_RP */ yytestcase(yyruleno==70);
+      case 71: /* parenthesized_joined_table ::= NK_LP parenthesized_joined_table NK_RP */ yytestcase(yyruleno==71);
+      case 123: /* subquery ::= NK_LP query_expression NK_RP */ yytestcase(yyruleno==123);
+{ PARSER_TRACE; yymsp[-2].minor.yy168 = yymsp[-1].minor.yy168; }
         break;
       case 22: /* expression ::= NK_PLUS expression */
       case 58: /* from_clause ::= FROM table_reference_list */ yytestcase(yyruleno==58);
-      case 86: /* where_clause_opt ::= WHERE search_condition */ yytestcase(yyruleno==86);
-      case 107: /* having_clause_opt ::= HAVING search_condition */ yytestcase(yyruleno==107);
-{ PARSER_TRACE; yymsp[-1].minor.yy212 = yymsp[0].minor.yy212; }
+      case 87: /* where_clause_opt ::= WHERE search_condition */ yytestcase(yyruleno==87);
+      case 108: /* having_clause_opt ::= HAVING search_condition */ yytestcase(yyruleno==108);
+{ PARSER_TRACE; yymsp[-1].minor.yy168 = yymsp[0].minor.yy168; }
         break;
       case 23: /* expression ::= NK_MINUS expression */
-{ PARSER_TRACE; yymsp[-1].minor.yy212 = createOperatorNode(pCxt, OP_TYPE_SUB, yymsp[0].minor.yy212, NULL); }
+{ PARSER_TRACE; yymsp[-1].minor.yy168 = createOperatorNode(pCxt, OP_TYPE_SUB, yymsp[0].minor.yy168, NULL); }
         break;
       case 24: /* expression ::= expression NK_PLUS expression */
-{ PARSER_TRACE; yylhsminor.yy212 = createOperatorNode(pCxt, OP_TYPE_ADD, yymsp[-2].minor.yy212, yymsp[0].minor.yy212); }
-  yymsp[-2].minor.yy212 = yylhsminor.yy212;
+{ PARSER_TRACE; yylhsminor.yy168 = createOperatorNode(pCxt, OP_TYPE_ADD, yymsp[-2].minor.yy168, yymsp[0].minor.yy168); }
+  yymsp[-2].minor.yy168 = yylhsminor.yy168;
         break;
       case 25: /* expression ::= expression NK_MINUS expression */
-{ PARSER_TRACE; yylhsminor.yy212 = createOperatorNode(pCxt, OP_TYPE_SUB, yymsp[-2].minor.yy212, yymsp[0].minor.yy212); }
-  yymsp[-2].minor.yy212 = yylhsminor.yy212;
+{ PARSER_TRACE; yylhsminor.yy168 = createOperatorNode(pCxt, OP_TYPE_SUB, yymsp[-2].minor.yy168, yymsp[0].minor.yy168); }
+  yymsp[-2].minor.yy168 = yylhsminor.yy168;
         break;
       case 26: /* expression ::= expression NK_STAR expression */
-{ PARSER_TRACE; yylhsminor.yy212 = createOperatorNode(pCxt, OP_TYPE_MULTI, yymsp[-2].minor.yy212, yymsp[0].minor.yy212); }
-  yymsp[-2].minor.yy212 = yylhsminor.yy212;
+{ PARSER_TRACE; yylhsminor.yy168 = createOperatorNode(pCxt, OP_TYPE_MULTI, yymsp[-2].minor.yy168, yymsp[0].minor.yy168); }
+  yymsp[-2].minor.yy168 = yylhsminor.yy168;
         break;
       case 27: /* expression ::= expression NK_SLASH expression */
-{ PARSER_TRACE; yylhsminor.yy212 = createOperatorNode(pCxt, OP_TYPE_DIV, yymsp[-2].minor.yy212, yymsp[0].minor.yy212); }
-  yymsp[-2].minor.yy212 = yylhsminor.yy212;
+{ PARSER_TRACE; yylhsminor.yy168 = createOperatorNode(pCxt, OP_TYPE_DIV, yymsp[-2].minor.yy168, yymsp[0].minor.yy168); }
+  yymsp[-2].minor.yy168 = yylhsminor.yy168;
         break;
       case 28: /* expression ::= expression NK_REM expression */
-{ PARSER_TRACE; yylhsminor.yy212 = createOperatorNode(pCxt, OP_TYPE_MOD, yymsp[-2].minor.yy212, yymsp[0].minor.yy212); }
-  yymsp[-2].minor.yy212 = yylhsminor.yy212;
+{ PARSER_TRACE; yylhsminor.yy168 = createOperatorNode(pCxt, OP_TYPE_MOD, yymsp[-2].minor.yy168, yymsp[0].minor.yy168); }
+  yymsp[-2].minor.yy168 = yylhsminor.yy168;
         break;
       case 31: /* column_reference ::= column_name */
-{ PARSER_TRACE; yylhsminor.yy212 = createColumnNode(pCxt, NULL, &yymsp[0].minor.yy79); }
-  yymsp[0].minor.yy212 = yylhsminor.yy212;
+{ PARSER_TRACE; yylhsminor.yy168 = createColumnNode(pCxt, NULL, &yymsp[0].minor.yy241); }
+  yymsp[0].minor.yy168 = yylhsminor.yy168;
         break;
       case 32: /* column_reference ::= table_name NK_DOT column_name */
-{ PARSER_TRACE; yylhsminor.yy212 = createColumnNode(pCxt, &yymsp[-2].minor.yy79, &yymsp[0].minor.yy79); }
-  yymsp[-2].minor.yy212 = yylhsminor.yy212;
+{ PARSER_TRACE; yylhsminor.yy168 = createColumnNode(pCxt, &yymsp[-2].minor.yy241, &yymsp[0].minor.yy241); }
+  yymsp[-2].minor.yy168 = yylhsminor.yy168;
         break;
       case 33: /* predicate ::= expression compare_op expression */
       case 38: /* predicate ::= expression in_op in_predicate_value */ yytestcase(yyruleno==38);
-{ PARSER_TRACE; yylhsminor.yy212 = createOperatorNode(pCxt, yymsp[-1].minor.yy40, yymsp[-2].minor.yy212, yymsp[0].minor.yy212); }
-  yymsp[-2].minor.yy212 = yylhsminor.yy212;
+{ PARSER_TRACE; yylhsminor.yy168 = createOperatorNode(pCxt, yymsp[-1].minor.yy228, yymsp[-2].minor.yy168, yymsp[0].minor.yy168); }
+  yymsp[-2].minor.yy168 = yylhsminor.yy168;
         break;
       case 34: /* predicate ::= expression BETWEEN expression AND expression */
-{ PARSER_TRACE; yylhsminor.yy212 = createBetweenAnd(pCxt, yymsp[-4].minor.yy212, yymsp[-2].minor.yy212, yymsp[0].minor.yy212); }
-  yymsp[-4].minor.yy212 = yylhsminor.yy212;
+{ PARSER_TRACE; yylhsminor.yy168 = createBetweenAnd(pCxt, yymsp[-4].minor.yy168, yymsp[-2].minor.yy168, yymsp[0].minor.yy168); }
+  yymsp[-4].minor.yy168 = yylhsminor.yy168;
         break;
       case 35: /* predicate ::= expression NOT BETWEEN expression AND expression */
-{ PARSER_TRACE; yylhsminor.yy212 = createNotBetweenAnd(pCxt, yymsp[-2].minor.yy212, yymsp[-5].minor.yy212, yymsp[0].minor.yy212); }
-  yymsp[-5].minor.yy212 = yylhsminor.yy212;
+{ PARSER_TRACE; yylhsminor.yy168 = createNotBetweenAnd(pCxt, yymsp[-2].minor.yy168, yymsp[-5].minor.yy168, yymsp[0].minor.yy168); }
+  yymsp[-5].minor.yy168 = yylhsminor.yy168;
         break;
       case 36: /* predicate ::= expression IS NULL */
-{ PARSER_TRACE; yylhsminor.yy212 = createIsNullCondNode(pCxt, yymsp[-2].minor.yy212, true); }
-  yymsp[-2].minor.yy212 = yylhsminor.yy212;
+{ PARSER_TRACE; yylhsminor.yy168 = createIsNullCondNode(pCxt, yymsp[-2].minor.yy168, true); }
+  yymsp[-2].minor.yy168 = yylhsminor.yy168;
         break;
       case 37: /* predicate ::= expression IS NOT NULL */
-{ PARSER_TRACE; yylhsminor.yy212 = createIsNullCondNode(pCxt, yymsp[-3].minor.yy212, false); }
-  yymsp[-3].minor.yy212 = yylhsminor.yy212;
+{ PARSER_TRACE; yylhsminor.yy168 = createIsNullCondNode(pCxt, yymsp[-3].minor.yy168, false); }
+  yymsp[-3].minor.yy168 = yylhsminor.yy168;
         break;
       case 39: /* compare_op ::= NK_LT */
-{ PARSER_TRACE; yymsp[0].minor.yy40 = OP_TYPE_LOWER_THAN; }
+{ PARSER_TRACE; yymsp[0].minor.yy228 = OP_TYPE_LOWER_THAN; }
         break;
       case 40: /* compare_op ::= NK_GT */
-{ PARSER_TRACE; yymsp[0].minor.yy40 = OP_TYPE_GREATER_THAN; }
+{ PARSER_TRACE; yymsp[0].minor.yy228 = OP_TYPE_GREATER_THAN; }
         break;
       case 41: /* compare_op ::= NK_LE */
-{ PARSER_TRACE; yymsp[0].minor.yy40 = OP_TYPE_LOWER_EQUAL; }
+{ PARSER_TRACE; yymsp[0].minor.yy228 = OP_TYPE_LOWER_EQUAL; }
         break;
       case 42: /* compare_op ::= NK_GE */
-{ PARSER_TRACE; yymsp[0].minor.yy40 = OP_TYPE_GREATER_EQUAL; }
+{ PARSER_TRACE; yymsp[0].minor.yy228 = OP_TYPE_GREATER_EQUAL; }
         break;
       case 43: /* compare_op ::= NK_NE */
-{ PARSER_TRACE; yymsp[0].minor.yy40 = OP_TYPE_NOT_EQUAL; }
+{ PARSER_TRACE; yymsp[0].minor.yy228 = OP_TYPE_NOT_EQUAL; }
         break;
       case 44: /* compare_op ::= NK_EQ */
-{ PARSER_TRACE; yymsp[0].minor.yy40 = OP_TYPE_EQUAL; }
+{ PARSER_TRACE; yymsp[0].minor.yy228 = OP_TYPE_EQUAL; }
         break;
       case 45: /* compare_op ::= LIKE */
-{ PARSER_TRACE; yymsp[0].minor.yy40 = OP_TYPE_LIKE; }
+{ PARSER_TRACE; yymsp[0].minor.yy228 = OP_TYPE_LIKE; }
         break;
       case 46: /* compare_op ::= NOT LIKE */
-{ PARSER_TRACE; yymsp[-1].minor.yy40 = OP_TYPE_NOT_LIKE; }
+{ PARSER_TRACE; yymsp[-1].minor.yy228 = OP_TYPE_NOT_LIKE; }
         break;
       case 47: /* compare_op ::= MATCH */
-{ PARSER_TRACE; yymsp[0].minor.yy40 = OP_TYPE_MATCH; }
+{ PARSER_TRACE; yymsp[0].minor.yy228 = OP_TYPE_MATCH; }
         break;
       case 48: /* compare_op ::= NMATCH */
-{ PARSER_TRACE; yymsp[0].minor.yy40 = OP_TYPE_NMATCH; }
+{ PARSER_TRACE; yymsp[0].minor.yy228 = OP_TYPE_NMATCH; }
         break;
       case 49: /* in_op ::= IN */
-{ PARSER_TRACE; yymsp[0].minor.yy40 = OP_TYPE_IN; }
+{ PARSER_TRACE; yymsp[0].minor.yy228 = OP_TYPE_IN; }
         break;
       case 50: /* in_op ::= NOT IN */
-{ PARSER_TRACE; yymsp[-1].minor.yy40 = OP_TYPE_NOT_IN; }
+{ PARSER_TRACE; yymsp[-1].minor.yy228 = OP_TYPE_NOT_IN; }
         break;
       case 51: /* in_predicate_value ::= NK_LP expression_list NK_RP */
-{ PARSER_TRACE; yymsp[-2].minor.yy212 = createNodeListNode(pCxt, yymsp[-1].minor.yy174); }
+{ PARSER_TRACE; yymsp[-2].minor.yy168 = createNodeListNode(pCxt, yymsp[-1].minor.yy192); }
         break;
       case 53: /* boolean_value_expression ::= NOT boolean_primary */
-{ PARSER_TRACE; yymsp[-1].minor.yy212 = createLogicConditionNode(pCxt, LOGIC_COND_TYPE_NOT, yymsp[0].minor.yy212, NULL); }
+{ PARSER_TRACE; yymsp[-1].minor.yy168 = createLogicConditionNode(pCxt, LOGIC_COND_TYPE_NOT, yymsp[0].minor.yy168, NULL); }
         break;
       case 54: /* boolean_value_expression ::= boolean_value_expression OR boolean_value_expression */
-{ PARSER_TRACE; yylhsminor.yy212 = createLogicConditionNode(pCxt, LOGIC_COND_TYPE_OR, yymsp[-2].minor.yy212, yymsp[0].minor.yy212); }
-  yymsp[-2].minor.yy212 = yylhsminor.yy212;
+{ PARSER_TRACE; yylhsminor.yy168 = createLogicConditionNode(pCxt, LOGIC_COND_TYPE_OR, yymsp[-2].minor.yy168, yymsp[0].minor.yy168); }
+  yymsp[-2].minor.yy168 = yylhsminor.yy168;
         break;
       case 55: /* boolean_value_expression ::= boolean_value_expression AND boolean_value_expression */
-{ PARSER_TRACE; yylhsminor.yy212 = createLogicConditionNode(pCxt, LOGIC_COND_TYPE_AND, yymsp[-2].minor.yy212, yymsp[0].minor.yy212); }
-  yymsp[-2].minor.yy212 = yylhsminor.yy212;
+{ PARSER_TRACE; yylhsminor.yy168 = createLogicConditionNode(pCxt, LOGIC_COND_TYPE_AND, yymsp[-2].minor.yy168, yymsp[0].minor.yy168); }
+  yymsp[-2].minor.yy168 = yylhsminor.yy168;
         break;
       case 60: /* table_reference_list ::= table_reference_list NK_COMMA table_reference */
-{ PARSER_TRACE; yylhsminor.yy212 = createJoinTableNode(pCxt, JOIN_TYPE_INNER, yymsp[-2].minor.yy212, yymsp[0].minor.yy212, NULL); }
-  yymsp[-2].minor.yy212 = yylhsminor.yy212;
+{ PARSER_TRACE; yylhsminor.yy168 = createJoinTableNode(pCxt, JOIN_TYPE_INNER, yymsp[-2].minor.yy168, yymsp[0].minor.yy168, NULL); }
+  yymsp[-2].minor.yy168 = yylhsminor.yy168;
         break;
       case 63: /* table_primary ::= table_name alias_opt */
-{ PARSER_TRACE; yylhsminor.yy212 = createRealTableNode(pCxt, NULL, &yymsp[-1].minor.yy79, &yymsp[0].minor.yy79); }
-  yymsp[-1].minor.yy212 = yylhsminor.yy212;
+{ PARSER_TRACE; yylhsminor.yy168 = createRealTableNode(pCxt, NULL, &yymsp[-1].minor.yy241, &yymsp[0].minor.yy241); }
+  yymsp[-1].minor.yy168 = yylhsminor.yy168;
         break;
       case 64: /* table_primary ::= db_name NK_DOT table_name alias_opt */
-{ PARSER_TRACE; yylhsminor.yy212 = createRealTableNode(pCxt, &yymsp[-3].minor.yy79, &yymsp[-1].minor.yy79, &yymsp[0].minor.yy79); }
-  yymsp[-3].minor.yy212 = yylhsminor.yy212;
+{ PARSER_TRACE; yylhsminor.yy168 = createRealTableNode(pCxt, &yymsp[-3].minor.yy241, &yymsp[-1].minor.yy241, &yymsp[0].minor.yy241); }
+  yymsp[-3].minor.yy168 = yylhsminor.yy168;
         break;
       case 65: /* table_primary ::= subquery alias_opt */
-{ PARSER_TRACE; yylhsminor.yy212 = createTempTableNode(pCxt, yymsp[-1].minor.yy212, &yymsp[0].minor.yy79); }
-  yymsp[-1].minor.yy212 = yylhsminor.yy212;
+{ PARSER_TRACE; yylhsminor.yy168 = createTempTableNode(pCxt, yymsp[-1].minor.yy168, &yymsp[0].minor.yy241); }
+  yymsp[-1].minor.yy168 = yylhsminor.yy168;
         break;
-      case 66: /* alias_opt ::= */
-{ PARSER_TRACE; yymsp[1].minor.yy79 = nil_token;  }
+      case 67: /* alias_opt ::= */
+{ PARSER_TRACE; yymsp[1].minor.yy241 = nil_token;  }
         break;
-      case 67: /* alias_opt ::= table_alias */
-{ PARSER_TRACE; yylhsminor.yy79 = yymsp[0].minor.yy79; }
-  yymsp[0].minor.yy79 = yylhsminor.yy79;
+      case 68: /* alias_opt ::= table_alias */
+{ PARSER_TRACE; yylhsminor.yy241 = yymsp[0].minor.yy241; }
+  yymsp[0].minor.yy241 = yylhsminor.yy241;
         break;
-      case 68: /* alias_opt ::= AS table_alias */
-{ PARSER_TRACE; yymsp[-1].minor.yy79 = yymsp[0].minor.yy79; }
+      case 69: /* alias_opt ::= AS table_alias */
+{ PARSER_TRACE; yymsp[-1].minor.yy241 = yymsp[0].minor.yy241; }
         break;
-      case 71: /* joined_table ::= table_reference join_type JOIN table_reference ON search_condition */
-{ PARSER_TRACE; yylhsminor.yy212 = createJoinTableNode(pCxt, yymsp[-4].minor.yy162, yymsp[-5].minor.yy212, yymsp[-2].minor.yy212, yymsp[0].minor.yy212); }
-  yymsp[-5].minor.yy212 = yylhsminor.yy212;
+      case 72: /* joined_table ::= table_reference join_type JOIN table_reference ON search_condition */
+{ PARSER_TRACE; yylhsminor.yy168 = createJoinTableNode(pCxt, yymsp[-4].minor.yy229, yymsp[-5].minor.yy168, yymsp[-2].minor.yy168, yymsp[0].minor.yy168); }
+  yymsp[-5].minor.yy168 = yylhsminor.yy168;
         break;
-      case 72: /* join_type ::= INNER */
-{ PARSER_TRACE; yymsp[0].minor.yy162 = JOIN_TYPE_INNER; }
+      case 73: /* join_type ::= INNER */
+{ PARSER_TRACE; yymsp[0].minor.yy229 = JOIN_TYPE_INNER; }
         break;
-      case 73: /* query_specification ::= SELECT set_quantifier_opt select_list from_clause where_clause_opt partition_by_clause_opt twindow_clause_opt group_by_clause_opt having_clause_opt */
+      case 74: /* query_specification ::= SELECT set_quantifier_opt select_list from_clause where_clause_opt partition_by_clause_opt twindow_clause_opt group_by_clause_opt having_clause_opt */
 { 
                                                                                     PARSER_TRACE;
-                                                                                    yymsp[-8].minor.yy212 = createSelectStmt(pCxt, yymsp[-7].minor.yy237, yymsp[-6].minor.yy174, yymsp[-5].minor.yy212);
-                                                                                    yymsp[-8].minor.yy212 = addWhereClause(pCxt, yymsp[-8].minor.yy212, yymsp[-4].minor.yy212);
-                                                                                    yymsp[-8].minor.yy212 = addPartitionByClause(pCxt, yymsp[-8].minor.yy212, yymsp[-3].minor.yy174);
-                                                                                    yymsp[-8].minor.yy212 = addWindowClauseClause(pCxt, yymsp[-8].minor.yy212, yymsp[-2].minor.yy212);
-                                                                                    yymsp[-8].minor.yy212 = addGroupByClause(pCxt, yymsp[-8].minor.yy212, yymsp[-1].minor.yy174);
-                                                                                    yymsp[-8].minor.yy212 = addHavingClause(pCxt, yymsp[-8].minor.yy212, yymsp[0].minor.yy212);
+                                                                                    yymsp[-8].minor.yy168 = createSelectStmt(pCxt, yymsp[-7].minor.yy209, yymsp[-6].minor.yy192, yymsp[-5].minor.yy168);
+                                                                                    yymsp[-8].minor.yy168 = addWhereClause(pCxt, yymsp[-8].minor.yy168, yymsp[-4].minor.yy168);
+                                                                                    yymsp[-8].minor.yy168 = addPartitionByClause(pCxt, yymsp[-8].minor.yy168, yymsp[-3].minor.yy192);
+                                                                                    yymsp[-8].minor.yy168 = addWindowClauseClause(pCxt, yymsp[-8].minor.yy168, yymsp[-2].minor.yy168);
+                                                                                    yymsp[-8].minor.yy168 = addGroupByClause(pCxt, yymsp[-8].minor.yy168, yymsp[-1].minor.yy192);
+                                                                                    yymsp[-8].minor.yy168 = addHavingClause(pCxt, yymsp[-8].minor.yy168, yymsp[0].minor.yy168);
                                                                                   }
         break;
-      case 74: /* set_quantifier_opt ::= */
-{ PARSER_TRACE; yymsp[1].minor.yy237 = false; }
+      case 75: /* set_quantifier_opt ::= */
+{ PARSER_TRACE; yymsp[1].minor.yy209 = false; }
         break;
-      case 75: /* set_quantifier_opt ::= DISTINCT */
-{ PARSER_TRACE; yymsp[0].minor.yy237 = true; }
+      case 76: /* set_quantifier_opt ::= DISTINCT */
+{ PARSER_TRACE; yymsp[0].minor.yy209 = true; }
         break;
-      case 76: /* set_quantifier_opt ::= ALL */
-{ PARSER_TRACE; yymsp[0].minor.yy237 = false; }
+      case 77: /* set_quantifier_opt ::= ALL */
+{ PARSER_TRACE; yymsp[0].minor.yy209 = false; }
         break;
-      case 77: /* select_list ::= NK_STAR */
-{ PARSER_TRACE; yymsp[0].minor.yy174 = NULL; }
+      case 78: /* select_list ::= NK_STAR */
+{ PARSER_TRACE; yymsp[0].minor.yy192 = NULL; }
         break;
-      case 78: /* select_list ::= select_sublist */
-{ PARSER_TRACE; yylhsminor.yy174 = yymsp[0].minor.yy174; }
-  yymsp[0].minor.yy174 = yylhsminor.yy174;
+      case 79: /* select_list ::= select_sublist */
+{ PARSER_TRACE; yylhsminor.yy192 = yymsp[0].minor.yy192; }
+  yymsp[0].minor.yy192 = yylhsminor.yy192;
         break;
-      case 82: /* select_item ::= expression column_alias */
-{ PARSER_TRACE; yylhsminor.yy212 = setProjectionAlias(pCxt, yymsp[-1].minor.yy212, &yymsp[0].minor.yy79); }
-  yymsp[-1].minor.yy212 = yylhsminor.yy212;
+      case 83: /* select_item ::= expression column_alias */
+{ PARSER_TRACE; yylhsminor.yy168 = setProjectionAlias(pCxt, yymsp[-1].minor.yy168, &yymsp[0].minor.yy241); }
+  yymsp[-1].minor.yy168 = yylhsminor.yy168;
         break;
-      case 83: /* select_item ::= expression AS column_alias */
-{ PARSER_TRACE; yylhsminor.yy212 = setProjectionAlias(pCxt, yymsp[-2].minor.yy212, &yymsp[0].minor.yy79); }
-  yymsp[-2].minor.yy212 = yylhsminor.yy212;
+      case 84: /* select_item ::= expression AS column_alias */
+{ PARSER_TRACE; yylhsminor.yy168 = setProjectionAlias(pCxt, yymsp[-2].minor.yy168, &yymsp[0].minor.yy241); }
+  yymsp[-2].minor.yy168 = yylhsminor.yy168;
         break;
-      case 84: /* select_item ::= table_name NK_DOT NK_STAR */
-{ PARSER_TRACE; yylhsminor.yy212 = createColumnNode(pCxt, &yymsp[-2].minor.yy79, &yymsp[0].minor.yy0); }
-  yymsp[-2].minor.yy212 = yylhsminor.yy212;
+      case 85: /* select_item ::= table_name NK_DOT NK_STAR */
+{ PARSER_TRACE; yylhsminor.yy168 = createColumnNode(pCxt, &yymsp[-2].minor.yy241, &yymsp[0].minor.yy0); }
+  yymsp[-2].minor.yy168 = yylhsminor.yy168;
         break;
-      case 85: /* where_clause_opt ::= */
-      case 89: /* twindow_clause_opt ::= */ yytestcase(yyruleno==89);
-      case 94: /* sliding_opt ::= */ yytestcase(yyruleno==94);
-      case 96: /* fill_opt ::= */ yytestcase(yyruleno==96);
-      case 106: /* having_clause_opt ::= */ yytestcase(yyruleno==106);
+      case 86: /* where_clause_opt ::= */
+      case 90: /* twindow_clause_opt ::= */ yytestcase(yyruleno==90);
+      case 95: /* sliding_opt ::= */ yytestcase(yyruleno==95);
+      case 97: /* fill_opt ::= */ yytestcase(yyruleno==97);
+      case 107: /* having_clause_opt ::= */ yytestcase(yyruleno==107);
       case 115: /* slimit_clause_opt ::= */ yytestcase(yyruleno==115);
       case 119: /* limit_clause_opt ::= */ yytestcase(yyruleno==119);
-{ PARSER_TRACE; yymsp[1].minor.yy212 = NULL; }
+{ PARSER_TRACE; yymsp[1].minor.yy168 = NULL; }
         break;
-      case 87: /* partition_by_clause_opt ::= */
-      case 104: /* group_by_clause_opt ::= */ yytestcase(yyruleno==104);
+      case 88: /* partition_by_clause_opt ::= */
+      case 105: /* group_by_clause_opt ::= */ yytestcase(yyruleno==105);
       case 113: /* order_by_clause_opt ::= */ yytestcase(yyruleno==113);
-{ PARSER_TRACE; yymsp[1].minor.yy174 = NULL; }
+{ PARSER_TRACE; yymsp[1].minor.yy192 = NULL; }
         break;
-      case 88: /* partition_by_clause_opt ::= PARTITION BY expression_list */
-      case 105: /* group_by_clause_opt ::= GROUP BY expression_list */ yytestcase(yyruleno==105);
+      case 89: /* partition_by_clause_opt ::= PARTITION BY expression_list */
+      case 106: /* group_by_clause_opt ::= GROUP BY expression_list */ yytestcase(yyruleno==106);
       case 114: /* order_by_clause_opt ::= ORDER BY sort_specification_list */ yytestcase(yyruleno==114);
-{ PARSER_TRACE; yymsp[-2].minor.yy174 = yymsp[0].minor.yy174; }
+{ PARSER_TRACE; yymsp[-2].minor.yy192 = yymsp[0].minor.yy192; }
         break;
-      case 90: /* twindow_clause_opt ::= SESSION NK_LP column_reference NK_COMMA NK_INTEGER NK_RP */
-{ PARSER_TRACE; yymsp[-5].minor.yy212 = createSessionWindowNode(pCxt, yymsp[-3].minor.yy212, &yymsp[-1].minor.yy0); }
+      case 91: /* twindow_clause_opt ::= SESSION NK_LP column_reference NK_COMMA NK_INTEGER NK_RP */
+{ PARSER_TRACE; yymsp[-5].minor.yy168 = createSessionWindowNode(pCxt, yymsp[-3].minor.yy168, &yymsp[-1].minor.yy0); }
         break;
-      case 91: /* twindow_clause_opt ::= STATE_WINDOW NK_LP column_reference NK_RP */
-{ PARSER_TRACE; yymsp[-3].minor.yy212 = createStateWindowNode(pCxt, yymsp[-1].minor.yy212); }
+      case 92: /* twindow_clause_opt ::= STATE_WINDOW NK_LP column_reference NK_RP */
+{ PARSER_TRACE; yymsp[-3].minor.yy168 = createStateWindowNode(pCxt, yymsp[-1].minor.yy168); }
         break;
-      case 92: /* twindow_clause_opt ::= INTERVAL NK_LP duration_literal NK_RP sliding_opt fill_opt */
-{ PARSER_TRACE; yymsp[-5].minor.yy212 = createIntervalWindowNode(pCxt, yymsp[-3].minor.yy212, NULL, yymsp[-1].minor.yy212, yymsp[0].minor.yy212); }
+      case 93: /* twindow_clause_opt ::= INTERVAL NK_LP duration_literal NK_RP sliding_opt fill_opt */
+{ PARSER_TRACE; yymsp[-5].minor.yy168 = createIntervalWindowNode(pCxt, yymsp[-3].minor.yy168, NULL, yymsp[-1].minor.yy168, yymsp[0].minor.yy168); }
         break;
-      case 93: /* twindow_clause_opt ::= INTERVAL NK_LP duration_literal NK_COMMA duration_literal NK_RP sliding_opt fill_opt */
-{ PARSER_TRACE; yymsp[-7].minor.yy212 = createIntervalWindowNode(pCxt, yymsp[-5].minor.yy212, yymsp[-3].minor.yy212, yymsp[-1].minor.yy212, yymsp[0].minor.yy212); }
+      case 94: /* twindow_clause_opt ::= INTERVAL NK_LP duration_literal NK_COMMA duration_literal NK_RP sliding_opt fill_opt */
+{ PARSER_TRACE; yymsp[-7].minor.yy168 = createIntervalWindowNode(pCxt, yymsp[-5].minor.yy168, yymsp[-3].minor.yy168, yymsp[-1].minor.yy168, yymsp[0].minor.yy168); }
         break;
-      case 95: /* sliding_opt ::= SLIDING NK_LP duration_literal NK_RP */
-{ PARSER_TRACE; yymsp[-3].minor.yy212 = yymsp[-1].minor.yy212; }
+      case 96: /* sliding_opt ::= SLIDING NK_LP duration_literal NK_RP */
+{ PARSER_TRACE; yymsp[-3].minor.yy168 = yymsp[-1].minor.yy168; }
         break;
-      case 97: /* fill_opt ::= FILL NK_LP fill_mode NK_RP */
-{ PARSER_TRACE; yymsp[-3].minor.yy212 = createFillNode(pCxt, yymsp[-1].minor.yy44, NULL); }
+      case 98: /* fill_opt ::= FILL NK_LP fill_mode NK_RP */
+{ PARSER_TRACE; yymsp[-3].minor.yy168 = createFillNode(pCxt, yymsp[-1].minor.yy14, NULL); }
         break;
-      case 98: /* fill_opt ::= FILL NK_LP VALUE NK_COMMA literal_list NK_RP */
-{ PARSER_TRACE; yymsp[-5].minor.yy212 = createFillNode(pCxt, FILL_MODE_VALUE, createNodeListNode(pCxt, yymsp[-1].minor.yy174)); }
+      case 99: /* fill_opt ::= FILL NK_LP VALUE NK_COMMA literal_list NK_RP */
+{ PARSER_TRACE; yymsp[-5].minor.yy168 = createFillNode(pCxt, FILL_MODE_VALUE, createNodeListNode(pCxt, yymsp[-1].minor.yy192)); }
         break;
-      case 99: /* fill_mode ::= NONE */
-{ PARSER_TRACE; yymsp[0].minor.yy44 = FILL_MODE_NONE; }
+      case 100: /* fill_mode ::= NONE */
+{ PARSER_TRACE; yymsp[0].minor.yy14 = FILL_MODE_NONE; }
         break;
-      case 100: /* fill_mode ::= PREV */
-{ PARSER_TRACE; yymsp[0].minor.yy44 = FILL_MODE_PREV; }
+      case 101: /* fill_mode ::= PREV */
+{ PARSER_TRACE; yymsp[0].minor.yy14 = FILL_MODE_PREV; }
         break;
-      case 101: /* fill_mode ::= NULL */
-{ PARSER_TRACE; yymsp[0].minor.yy44 = FILL_MODE_NULL; }
+      case 102: /* fill_mode ::= NULL */
+{ PARSER_TRACE; yymsp[0].minor.yy14 = FILL_MODE_NULL; }
         break;
-      case 102: /* fill_mode ::= LINEAR */
-{ PARSER_TRACE; yymsp[0].minor.yy44 = FILL_MODE_LINEAR; }
+      case 103: /* fill_mode ::= LINEAR */
+{ PARSER_TRACE; yymsp[0].minor.yy14 = FILL_MODE_LINEAR; }
         break;
-      case 103: /* fill_mode ::= NEXT */
-{ PARSER_TRACE; yymsp[0].minor.yy44 = FILL_MODE_NEXT; }
+      case 104: /* fill_mode ::= NEXT */
+{ PARSER_TRACE; yymsp[0].minor.yy14 = FILL_MODE_NEXT; }
         break;
-      case 108: /* query_expression ::= query_expression_body order_by_clause_opt slimit_clause_opt limit_clause_opt */
+      case 109: /* query_expression ::= query_expression_body order_by_clause_opt slimit_clause_opt limit_clause_opt */
 { 
                                                                                     PARSER_TRACE;
-                                                                                    yylhsminor.yy212 = addOrderByClause(pCxt, yymsp[-3].minor.yy212, yymsp[-2].minor.yy174);
-                                                                                    yylhsminor.yy212 = addSlimitClause(pCxt, yylhsminor.yy212, yymsp[-1].minor.yy212);
-                                                                                    yylhsminor.yy212 = addLimitClause(pCxt, yylhsminor.yy212, yymsp[0].minor.yy212);
+                                                                                    yylhsminor.yy168 = addOrderByClause(pCxt, yymsp[-3].minor.yy168, yymsp[-2].minor.yy192);
+                                                                                    yylhsminor.yy168 = addSlimitClause(pCxt, yylhsminor.yy168, yymsp[-1].minor.yy168);
+                                                                                    yylhsminor.yy168 = addLimitClause(pCxt, yylhsminor.yy168, yymsp[0].minor.yy168);
                                                                                   }
-  yymsp[-3].minor.yy212 = yylhsminor.yy212;
+  yymsp[-3].minor.yy168 = yylhsminor.yy168;
         break;
-      case 110: /* query_expression_body ::= query_expression_body UNION ALL query_expression_body */
-{ PARSER_TRACE; yylhsminor.yy212 = createSetOperator(pCxt, SET_OP_TYPE_UNION_ALL, yymsp[-3].minor.yy212, yymsp[0].minor.yy212); }
-  yymsp[-3].minor.yy212 = yylhsminor.yy212;
-        break;
-      case 112: /* query_primary ::= NK_LP query_expression_body order_by_clause_opt limit_clause_opt slimit_clause_opt NK_RP */
-{ PARSER_TRACE; yymsp[-5].minor.yy212 = yymsp[-4].minor.yy212;}
-  yy_destructor(yypParser,117,&yymsp[-3].minor);
-  yy_destructor(yypParser,119,&yymsp[-2].minor);
-  yy_destructor(yypParser,118,&yymsp[-1].minor);
+      case 111: /* query_expression_body ::= query_expression_body UNION ALL query_expression_body */
+{ PARSER_TRACE; yylhsminor.yy168 = createSetOperator(pCxt, SET_OP_TYPE_UNION_ALL, yymsp[-3].minor.yy168, yymsp[0].minor.yy168); }
+  yymsp[-3].minor.yy168 = yylhsminor.yy168;
         break;
       case 116: /* slimit_clause_opt ::= SLIMIT NK_INTEGER */
       case 120: /* limit_clause_opt ::= LIMIT NK_INTEGER */ yytestcase(yyruleno==120);
-{ PARSER_TRACE; yymsp[-1].minor.yy212 = createLimitNode(pCxt, &yymsp[0].minor.yy0, NULL); }
+{ PARSER_TRACE; yymsp[-1].minor.yy168 = createLimitNode(pCxt, &yymsp[0].minor.yy0, NULL); }
         break;
       case 117: /* slimit_clause_opt ::= SLIMIT NK_INTEGER SOFFSET NK_INTEGER */
       case 121: /* limit_clause_opt ::= LIMIT NK_INTEGER OFFSET NK_INTEGER */ yytestcase(yyruleno==121);
-{ PARSER_TRACE; yymsp[-3].minor.yy212 = createLimitNode(pCxt, &yymsp[-2].minor.yy0, &yymsp[0].minor.yy0); }
+{ PARSER_TRACE; yymsp[-3].minor.yy168 = createLimitNode(pCxt, &yymsp[-2].minor.yy0, &yymsp[0].minor.yy0); }
         break;
       case 118: /* slimit_clause_opt ::= SLIMIT NK_INTEGER NK_COMMA NK_INTEGER */
       case 122: /* limit_clause_opt ::= LIMIT NK_INTEGER NK_COMMA NK_INTEGER */ yytestcase(yyruleno==122);
-{ PARSER_TRACE; yymsp[-3].minor.yy212 = createLimitNode(pCxt, &yymsp[0].minor.yy0, &yymsp[-2].minor.yy0); }
+{ PARSER_TRACE; yymsp[-3].minor.yy168 = createLimitNode(pCxt, &yymsp[0].minor.yy0, &yymsp[-2].minor.yy0); }
         break;
       case 127: /* sort_specification ::= expression ordering_specification_opt null_ordering_opt */
-{ PARSER_TRACE; yylhsminor.yy212 = createOrderByExprNode(pCxt, yymsp[-2].minor.yy212, yymsp[-1].minor.yy188, yymsp[0].minor.yy107); }
-  yymsp[-2].minor.yy212 = yylhsminor.yy212;
+{ PARSER_TRACE; yylhsminor.yy168 = createOrderByExprNode(pCxt, yymsp[-2].minor.yy168, yymsp[-1].minor.yy10, yymsp[0].minor.yy177); }
+  yymsp[-2].minor.yy168 = yylhsminor.yy168;
         break;
       case 128: /* ordering_specification_opt ::= */
-{ PARSER_TRACE; yymsp[1].minor.yy188 = ORDER_ASC; }
+{ PARSER_TRACE; yymsp[1].minor.yy10 = ORDER_ASC; }
         break;
       case 129: /* ordering_specification_opt ::= ASC */
-{ PARSER_TRACE; yymsp[0].minor.yy188 = ORDER_ASC; }
+{ PARSER_TRACE; yymsp[0].minor.yy10 = ORDER_ASC; }
         break;
       case 130: /* ordering_specification_opt ::= DESC */
-{ PARSER_TRACE; yymsp[0].minor.yy188 = ORDER_DESC; }
+{ PARSER_TRACE; yymsp[0].minor.yy10 = ORDER_DESC; }
         break;
       case 131: /* null_ordering_opt ::= */
-{ PARSER_TRACE; yymsp[1].minor.yy107 = NULL_ORDER_DEFAULT; }
+{ PARSER_TRACE; yymsp[1].minor.yy177 = NULL_ORDER_DEFAULT; }
         break;
       case 132: /* null_ordering_opt ::= NULLS FIRST */
-{ PARSER_TRACE; yymsp[-1].minor.yy107 = NULL_ORDER_FIRST; }
+{ PARSER_TRACE; yymsp[-1].minor.yy177 = NULL_ORDER_FIRST; }
         break;
       case 133: /* null_ordering_opt ::= NULLS LAST */
-{ PARSER_TRACE; yymsp[-1].minor.yy107 = NULL_ORDER_LAST; }
-        break;
-      case 134: /* table_primary ::= parenthesized_joined_table */
-{  yy_destructor(yypParser,100,&yymsp[0].minor);
-{
-}
-}
+{ PARSER_TRACE; yymsp[-1].minor.yy177 = NULL_ORDER_LAST; }
         break;
       default:
         break;
diff --git a/source/libs/parser/src/parserImpl.c b/source/libs/parser/src/parserImpl.c
index fdedafcbb49e596be898c446bbe4aa4e15fd488c..7182bcfedfa13b9eabc94e827cc668148788dd50 100644
--- a/source/libs/parser/src/parserImpl.c
+++ b/source/libs/parser/src/parserImpl.c
@@ -15,8 +15,9 @@
 
 #include "parserImpl.h"
 
-#include "ttoken.h"
 #include "astCreateContext.h"
+#include "parserInt.h"
+#include "ttoken.h"
 
 typedef void* (*FMalloc)(size_t);
 typedef void (*FFree)(void*);
@@ -24,9 +25,85 @@ typedef void (*FFree)(void*);
 extern void* NewParseAlloc(FMalloc);
 extern void NewParse(void*, int, SToken, void*);
 extern void NewParseFree(void*, FFree);
+extern void NewParseTrace(FILE*, char*);
+
+static uint32_t toNewTokenId(uint32_t tokenId) {
+// #define                                1
+// #define NEW_TK_AND                              2
+// #define NEW_TK_UNION                            3
+// #define NEW_TK_ALL                              4
+// #define NEW_TK_MINUS                            5
+// #define NEW_TK_EXCEPT                           6
+// #define NEW_TK_INTERSECT                        7
+// #define NEW_TK_NK_PLUS                          8
+// #define NEW_TK_NK_MINUS                         9
+// #define NEW_TK_NK_STAR                         10
+// #define NEW_TK_NK_SLASH                        11
+// #define NEW_TK_NK_REM                          12
+// #define NEW_TK_SHOW                            13
+// #define NEW_TK_DATABASES                       14
+// #define NEW_TK_NK_INTEGER                      15
+// #define NEW_TK_NK_FLOAT                        16
+// #define NEW_TK_NK_STRING                       17
+// #define NEW_TK_NK_BOOL                         18
+// #define NEW_TK_TIMESTAMP                       19
+// #define NEW_TK_NK_VARIABLE                     20
+// #define NEW_TK_NK_COMMA                        21
+// #define NEW_TK_NK_ID                           22
+// #define NEW_TK_NK_LP                           23
+// #define NEW_TK_NK_RP                           24
+// #define NEW_TK_NK_DOT                          25
+// #define NEW_TK_BETWEEN                         26
+// #define NEW_TK_NOT                             27
+// #define NEW_TK_IS                              28
+// #define NEW_TK_NULL                            29
+// #define NEW_TK_NK_LT                           30
+// #define NEW_TK_NK_GT                           31
+// #define NEW_TK_NK_LE                           32
+// #define NEW_TK_NK_GE                           33
+// #define NEW_TK_NK_NE                           34
+// #define                            35
+// #define NEW_TK_LIKE                            36
+// #define NEW_TK_MATCH                           37
+// #define NEW_TK_NMATCH                          38
+// #define NEW_TK_IN                              39
+// #define NEW_TK_FROM                            40
+// #define NEW_TK_AS                              41
+// #define NEW_TK_JOIN                            42
+// #define NEW_TK_ON                              43
+// #define NEW_TK_INNER                           44
+// #define NEW_TK_SELECT                          45
+// #define NEW_TK_DISTINCT                        46
+// #define                            47
+// #define NEW_TK_PARTITION                       48
+// #define NEW_TK_BY                              49
+// #define NEW_TK_SESSION                         50
+// #define NEW_TK_STATE_WINDOW                    51
+// #define NEW_TK_INTERVAL                        52
+// #define NEW_TK_SLIDING                         53
+// #define NEW_TK_FILL                            54
+// #define NEW_TK_VALUE                           55
+// #define NEW_TK_NONE                            56
+// #define NEW_TK_PREV                            57
+// #define NEW_TK_LINEAR                          58
+// #define NEW_TK_NEXT                            59
+// #define NEW_TK_GROUP                           60
+// #define NEW_TK_HAVING                          61
+// #define NEW_TK_ORDER                           62
+// #define NEW_TK_SLIMIT                          63
+// #define NEW_TK_SOFFSET                         64
+// #define NEW_TK_LIMIT                           65
+// #define NEW_TK_OFFSET                          66
+// #define NEW_TK_NK_LR                           67
+// #define NEW_TK_ASC                             68
+// #define NEW_TK_DESC                            69
+// #define NEW_TK_NULLS                           70
+// #define NEW_TK_FIRST                           71
+// #define NEW_TK_LAST                            72
 
-uint32_t toNewTokenId(uint32_t tokenId) {
   switch (tokenId) {
+    case TK_OR:
+      return NEW_TK_OR;
     case TK_UNION:
       return NEW_TK_UNION;
     case TK_ALL:
@@ -53,10 +130,14 @@ uint32_t toNewTokenId(uint32_t tokenId) {
       return NEW_TK_NK_COMMA;
     case TK_DOT:
       return NEW_TK_NK_DOT;
+    case TK_EQ:
+      return NEW_TK_NK_EQ;
     case TK_SELECT:
       return NEW_TK_SELECT;
     case TK_DISTINCT:
       return NEW_TK_DISTINCT;
+    case TK_WHERE:
+      return NEW_TK_WHERE;
     case TK_AS:
       return NEW_TK_AS;
     case TK_FROM:
@@ -69,11 +150,15 @@ uint32_t toNewTokenId(uint32_t tokenId) {
       return NEW_TK_ASC;
     case TK_DESC:
       return NEW_TK_DESC;
+    case TK_SPACE:
+      break;
+    default:
+      printf("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!tokenId = %d\n", tokenId);
   }
   return tokenId;
 }
 
-uint32_t getToken(const char* z, uint32_t* tokenId) {
+static uint32_t getToken(const char* z, uint32_t* tokenId) {
   uint32_t n = tGetToken(z, tokenId);
   *tokenId = toNewTokenId(*tokenId);
   return n;
@@ -124,6 +209,7 @@ int32_t doParse(SParseContext* pParseCxt, SQuery* pQuery) {
 
       default:
         NewParse(pParser, t0.type, t0, &cxt);
+        // NewParseTrace(stdout, "");
         if (!cxt.valid) {
           goto abort_parse;
         }
@@ -137,3 +223,359 @@ abort_parse:
   pQuery->pRoot = cxt.pRootNode;
   return cxt.valid ? TSDB_CODE_SUCCESS : TSDB_CODE_FAILED;
 }
+
+// typedef struct SNamespace {
+//   int16_t level; // todo for correlated subquery
+//   char dbName[TSDB_DB_NAME_LEN];
+//   char tableAlias[TSDB_TABLE_NAME_LEN];
+//   SHashObj* pColHash; // key is colname, value is index of STableMeta.schema
+//   STableMeta* pMeta;
+// } SNamespace;
+
+typedef enum ESqlClause {
+  SQL_CLAUSE_FROM = 1,
+  SQL_CLAUSE_WHERE
+} ESqlClause;
+
+typedef struct STranslateContext {
+  SParseContext* pParseCxt;
+  int32_t errCode;
+  SMsgBuf msgBuf;
+  SArray* pNsLevel; // element is SArray*, the element of this subarray is STableNode*
+  int32_t currLevel;
+  ESqlClause currClause;
+} STranslateContext;
+
+static int32_t translateSubquery(STranslateContext* pCxt, SNode* pNode);
+
+static char* getSyntaxErrFormat(int32_t errCode) {
+  switch (errCode) {
+    case TSDB_CODE_PARSER_INVALID_COLUMN:
+      return "Invalid column name : %s";
+    case TSDB_CODE_PARSER_TABLE_NOT_EXIST:
+      return "Table does not exist : %s";
+    case TSDB_CODE_PARSER_AMBIGUOUS_COLUMN:
+      return "Column ambiguously defined : %s";
+    default:
+      return "Unknown error";
+  }
+}
+
+static int32_t generateSyntaxErrMsg(STranslateContext* pCxt, int32_t errCode, const char* additionalInfo) {
+  snprintf(pCxt->msgBuf.buf, pCxt->msgBuf.len, getSyntaxErrFormat(errCode), additionalInfo);
+  pCxt->errCode = errCode;
+  return errCode;
+}
+
+static int32_t addNamespace(STranslateContext* pCxt, void* pTable) {
+  size_t currTotalLevel = taosArrayGetSize(pCxt->pNsLevel);
+  if (currTotalLevel > pCxt->currLevel) {
+    SArray* pTables = taosArrayGetP(pCxt->pNsLevel, pCxt->currLevel);
+    taosArrayPush(pTables, &pTable);
+  } else {
+    do {
+      SArray* pTables = taosArrayInit(TARRAY_MIN_SIZE, POINTER_BYTES);
+      if (pCxt->currLevel == currTotalLevel) {
+        taosArrayPush(pTables, &pTable);
+      }
+      taosArrayPush(pCxt->pNsLevel, &pTables);
+      ++currTotalLevel;
+    } while (currTotalLevel <= pCxt->currLevel);
+  }
+  return TSDB_CODE_SUCCESS;
+}
+
+static SName* toName(int32_t acctId, const SRealTableNode* pRealTable, SName* pName) {
+  pName->type = TSDB_TABLE_NAME_T;
+  pName->acctId = acctId;
+  strcpy(pName->dbname, pRealTable->table.dbName);
+  strcpy(pName->tname, pRealTable->table.tableName);
+  return pName;
+}
+
+static bool belongTable(const char* currentDb, const SColumnNode* pCol, const STableNode* pTable) {
+  int cmp = 0;
+  if ('\0' != pCol->dbName[0]) {
+    cmp = strcmp(pCol->dbName, pTable->dbName);
+  } else {
+    cmp = strcmp(currentDb, pTable->dbName);
+  }
+  if (0 == cmp) {
+    cmp = strcmp(pCol->tableAlias, pTable->tableAlias);
+  }
+  return (0 == cmp);
+}
+
+static SNodeList* getProjectList(SNode* pNode) {
+  if (QUERY_NODE_SELECT_STMT == nodeType(pNode)) {
+    return ((SSelectStmt*)pNode)->pProjectionList;
+  }
+  return NULL;
+}
+
+static void setColumnInfoBySchema(const STableNode* pTable, const SSchema* pColSchema, SColumnNode* pCol) {
+  strcpy(pCol->dbName, pTable->dbName);
+  strcpy(pCol->tableAlias, pTable->tableAlias);
+  strcpy(pCol->tableName, pTable->tableName);
+  strcpy(pCol->colName, pColSchema->name);
+  if ('\0' == pCol->node.aliasName[0]) {
+    strcpy(pCol->node.aliasName, pColSchema->name);
+  }
+  pCol->colId = pColSchema->colId;
+  pCol->colType = pColSchema->type;
+  pCol->node.resType.bytes = pColSchema->bytes;
+}
+
+static void setColumnInfoByExpr(const STableNode* pTable, SExprNode* pExpr, SColumnNode* pCol) {
+  pCol->pProjectRef = (SNode*)pExpr;
+  pExpr->pAssociationList = nodesListAppend(pExpr->pAssociationList, (SNode*)pCol);
+  strcpy(pCol->tableAlias, pTable->tableAlias);
+  strcpy(pCol->colName, pExpr->aliasName);
+  pCol->node.resType = pExpr->resType;
+}
+
+static int32_t createColumnNodeByTable(const STableNode* pTable, SNodeList* pList) {
+  if (QUERY_NODE_REAL_TABLE == nodeType(pTable)) {
+    const STableMeta* pMeta = ((SRealTableNode*)pTable)->pMeta;
+    int32_t nums = pMeta->tableInfo.numOfTags + pMeta->tableInfo.numOfColumns;
+    for (int32_t i = 0; i < nums; ++i) {
+      SColumnNode* pCol = (SColumnNode*)nodesMakeNode(QUERY_NODE_COLUMN);
+      setColumnInfoBySchema(pTable, pMeta->schema + i, pCol);
+      nodesListAppend(pList, (SNode*)pCol);
+    }
+  } else {
+    SNodeList* pProjectList = getProjectList(((STempTableNode*)pTable)->pSubquery);
+    SNode* pNode;
+    FOREACH(pNode, pProjectList) {
+      SColumnNode* pCol = (SColumnNode*)nodesMakeNode(QUERY_NODE_COLUMN);
+      setColumnInfoByExpr(pTable, (SExprNode*)pNode, pCol);
+      nodesListAppend(pList, (SNode*)pCol);
+    }
+  }
+}
+
+static bool findAndSetColumn(SColumnNode* pCol, const STableNode* pTable) {
+  bool found = false;
+  if (QUERY_NODE_REAL_TABLE == nodeType(pTable)) {
+    const STableMeta* pMeta = ((SRealTableNode*)pTable)->pMeta;
+    int32_t nums = pMeta->tableInfo.numOfTags + pMeta->tableInfo.numOfColumns;
+    for (int32_t i = 0; i < nums; ++i) {
+      if (0 == strcmp(pCol->colName, pMeta->schema[i].name)) {
+        setColumnInfoBySchema(pTable, pMeta->schema + i, pCol);
+        found = true;
+        break;
+      }
+    }
+  } else {
+    SNodeList* pProjectList = getProjectList(((STempTableNode*)pTable)->pSubquery);
+    SNode* pNode;
+    FOREACH(pNode, pProjectList) {
+      SExprNode* pExpr = (SExprNode*)pNode;
+      if (0 == strcmp(pCol->colName, pExpr->aliasName)) {
+        setColumnInfoByExpr(pTable, pExpr, pCol);
+        found = true;
+        break;
+      }
+    }
+  }
+  return found;
+}
+
+static bool translateColumnWithPrefix(STranslateContext* pCxt, SColumnNode* pCol) {
+  SArray* pTables = taosArrayGetP(pCxt->pNsLevel, pCxt->currLevel);
+  size_t nums = taosArrayGetSize(pTables);
+  for (size_t i = 0; i < nums; ++i) {
+    STableNode* pTable = taosArrayGetP(pTables, i);
+    if (belongTable(pCxt->pParseCxt->db, pCol, pTable)) {
+      if (findAndSetColumn(pCol, pTable)) {
+        break;
+      }
+      generateSyntaxErrMsg(pCxt, TSDB_CODE_PARSER_INVALID_COLUMN, pCol->colName);
+      return false;
+    }
+  }
+  return true;
+}
+
+static bool translateColumnWithoutPrefix(STranslateContext* pCxt, SColumnNode* pCol) {
+  SArray* pTables = taosArrayGetP(pCxt->pNsLevel, pCxt->currLevel);
+  size_t nums = taosArrayGetSize(pTables);
+  bool found = false;
+  for (size_t i = 0; i < nums; ++i) {
+    STableNode* pTable = taosArrayGetP(pTables, i);
+    if (findAndSetColumn(pCol, pTable)) {
+      if (found) {
+        generateSyntaxErrMsg(pCxt, TSDB_CODE_PARSER_AMBIGUOUS_COLUMN, pCol->colName);
+        return false;
+      }
+      found = true;
+    }
+  }
+  if (!found) {
+    generateSyntaxErrMsg(pCxt, TSDB_CODE_PARSER_INVALID_COLUMN, pCol->colName);
+    return false;
+  }
+  return true;
+}
+
+static bool translateColumn(STranslateContext* pCxt, SColumnNode* pCol) {
+  if ('\0' != pCol->tableAlias[0]) {
+    return translateColumnWithPrefix(pCxt, pCol);
+  }
+  return translateColumnWithoutPrefix(pCxt, pCol);
+}
+
+// check literal format
+static bool translateValue(STranslateContext* pCxt, SValueNode* pVal) {
+  return true;
+}
+
+static bool translateOperator(STranslateContext* pCxt, SOperatorNode* pOp) {
+  return true;
+}
+
+static bool translateFunction(STranslateContext* pCxt, SFunctionNode* pFunc) {
+  return true;
+}
+
+static bool doTranslateExpr(SNode* pNode, void* pContext) {
+  STranslateContext* pCxt = (STranslateContext*)pContext;
+  switch (nodeType(pNode)) {
+    case QUERY_NODE_COLUMN:
+      return translateColumn(pCxt, (SColumnNode*)pNode);
+    case QUERY_NODE_VALUE:
+      return translateValue(pCxt, (SValueNode*)pNode);
+    case QUERY_NODE_OPERATOR:
+      return translateOperator(pCxt, (SOperatorNode*)pNode);
+    case QUERY_NODE_FUNCTION:
+      return translateFunction(pCxt, (SFunctionNode*)pNode);
+    case QUERY_NODE_TEMP_TABLE:
+      return translateSubquery(pCxt, ((STempTableNode*)pNode)->pSubquery);
+    default:
+      break;
+  }
+  return true;
+}
+
+static int32_t translateExpr(STranslateContext* pCxt, SNode* pNode) {
+  nodesWalkNodePostOrder(pNode, doTranslateExpr, pCxt);
+  return pCxt->errCode;
+}
+
+static int32_t translateExprList(STranslateContext* pCxt, SNodeList* pList) {
+  nodesWalkListPostOrder(pList, doTranslateExpr, pCxt);
+  return pCxt->errCode;
+}
+
+static int32_t translateTable(STranslateContext* pCxt, SNode* pTable) {
+  int32_t code = TSDB_CODE_SUCCESS;
+  switch (nodeType(pTable)) {
+    case QUERY_NODE_REAL_TABLE: {
+      SRealTableNode* pRealTable = (SRealTableNode*)pTable;
+      SName name;
+      code = catalogGetTableMeta(pCxt->pParseCxt->pCatalog, pCxt->pParseCxt->pTransporter, &(pCxt->pParseCxt->mgmtEpSet),
+          toName(pCxt->pParseCxt->acctId, pRealTable, &name), &(pRealTable->pMeta));
+      if (TSDB_CODE_SUCCESS != code) {
+        return generateSyntaxErrMsg(pCxt, TSDB_CODE_PARSER_TABLE_NOT_EXIST, pRealTable->table.tableName);
+      }
+      code = addNamespace(pCxt, pRealTable);
+      break;
+    }
+    case QUERY_NODE_TEMP_TABLE: {
+      STempTableNode* pTempTable = (STempTableNode*)pTable;
+      code = translateSubquery(pCxt, pTempTable->pSubquery);
+      if (TSDB_CODE_SUCCESS == code) {
+        code = addNamespace(pCxt, pTempTable);
+      }
+      break;
+    }
+    case QUERY_NODE_JOIN_TABLE: {
+      SJoinTableNode* pJoinTable = (SJoinTableNode*)pTable;
+      code = translateTable(pCxt, pJoinTable->pLeft);
+      if (TSDB_CODE_SUCCESS == code) {
+        code = translateTable(pCxt, pJoinTable->pRight);
+      }
+      if (TSDB_CODE_SUCCESS == code) {
+        code = translateExpr(pCxt, pJoinTable->pOnCond);
+      }
+      break;
+    }
+    default:
+      break;
+  }
+  return code;
+}
+
+static int32_t translateFrom(STranslateContext* pCxt, SNode* pTable) {
+  pCxt->currClause = SQL_CLAUSE_FROM;
+  return translateTable(pCxt, pTable);
+}
+
+static int32_t translateStar(STranslateContext* pCxt, SSelectStmt* pSelect, bool* pIsSelectStar) {
+  if (NULL == pSelect->pProjectionList) { // select * ...
+    SArray* pTables = taosArrayGetP(pCxt->pNsLevel, pCxt->currLevel);
+    size_t nums = taosArrayGetSize(pTables);
+    pSelect->pProjectionList = nodesMakeList();
+    for (size_t i = 0; i < nums; ++i) {
+      STableNode* pTable = taosArrayGetP(pTables, i);
+      createColumnNodeByTable(pTable, pSelect->pProjectionList);
+    }
+    *pIsSelectStar = true;
+  } else {
+
+  }
+  return TSDB_CODE_SUCCESS;
+}
+
+static int32_t translateSelect(STranslateContext* pCxt, SSelectStmt* pSelect) {
+  int32_t code = TSDB_CODE_SUCCESS;
+  code = translateFrom(pCxt, pSelect->pFromTable);
+  if (TSDB_CODE_SUCCESS == code) {
+    code = translateExpr(pCxt, pSelect->pWhere);
+  }
+  if (TSDB_CODE_SUCCESS == code) {
+    code = translateExprList(pCxt, pSelect->pGroupByList);
+  }
+  bool isSelectStar = false;
+  if (TSDB_CODE_SUCCESS == code) {
+    code = translateStar(pCxt, pSelect, &isSelectStar);
+  }
+  if (TSDB_CODE_SUCCESS == code && !isSelectStar) {
+    code = translateExprList(pCxt, pSelect->pProjectionList);
+  }
+  // printf("%s:%d code = %d\n", __FUNCTION__, __LINE__, code);
+  return code;
+}
+
+static int32_t translateQuery(STranslateContext* pCxt, SNode* pNode) {
+  int32_t code = TSDB_CODE_SUCCESS;
+  switch (nodeType(pNode)) {
+    case QUERY_NODE_SELECT_STMT:
+      code = translateSelect(pCxt, (SSelectStmt*)pNode);
+      break;
+    default:
+      break;
+  }
+  return code;
+}
+
+static int32_t translateSubquery(STranslateContext* pCxt, SNode* pNode) {
+  ++(pCxt->currLevel);
+  ESqlClause currClause = pCxt->currClause;
+  int32_t code = translateQuery(pCxt, pNode);
+  --(pCxt->currLevel);
+  pCxt->currClause = currClause;
+  return code;
+}
+
+int32_t doTranslate(SParseContext* pParseCxt, SQuery* pQuery) {
+  STranslateContext cxt = {
+    .pParseCxt = pParseCxt,
+    .errCode = TSDB_CODE_SUCCESS,
+    .msgBuf = { .buf = pParseCxt->pMsg, .len = pParseCxt->msgLen },
+    .pNsLevel = taosArrayInit(TARRAY_MIN_SIZE, POINTER_BYTES),
+    .currLevel = 0,
+    .currClause = 0
+  };
+  return translateQuery(&cxt, pQuery->pRoot);
+}
diff --git a/source/libs/parser/test/newParserTest.cpp b/source/libs/parser/test/newParserTest.cpp
index 706deb443c3c54bddd389d860ed3a6f41af21ae1..973a6aff1ebaf0a40a4e31473c8758fcf019b4b5 100644
--- a/source/libs/parser/test/newParserTest.cpp
+++ b/source/libs/parser/test/newParserTest.cpp
@@ -38,46 +38,149 @@ protected:
 
   }
 
-  bool run(int32_t expectCode = TSDB_CODE_SUCCESS) {
+  bool run(int32_t parseCode = TSDB_CODE_SUCCESS, int32_t translateCode = TSDB_CODE_SUCCESS) {
     int32_t code = doParse(&cxt_, &query_);
+    // cout << "doParse return " << code << endl;
     if (code != TSDB_CODE_SUCCESS) {
       cout << "sql:[" << cxt_.pSql << "] code:" << tstrerror(code) << ", msg:" << errMagBuf_ << endl;
-      return (code == expectCode);
+      return (TSDB_CODE_SUCCESS != parseCode);
+    }
+    if (TSDB_CODE_SUCCESS != parseCode) {
+      return false;
+    }
+    code = doTranslate(&cxt_, &query_);
+    // cout << "doTranslate return " << code << endl;
+    if (code != TSDB_CODE_SUCCESS) {
+      cout << "sql:[" << cxt_.pSql << "] code:" << tstrerror(code) << ", msg:" << errMagBuf_ << endl;
+      return (TSDB_CODE_SUCCESS != translateCode);
     }
     if (NULL != query_.pRoot && QUERY_NODE_SELECT_STMT == nodeType(query_.pRoot)) {
-      SSelectStmt* select = (SSelectStmt*)query_.pRoot;
-      string sql("SELECT ");
-      if (select->isDistinct) {
-        sql.append("DISTINCT ");
-      }
-      if (nullptr == select->pProjectionList) {
-        sql.append("* ");
-      } else {
-        nodeListToSql(select->pProjectionList, sql);
-      }
-      sql.append("FROM ");
-      tableToSql(select->pFromTable, sql);
-      cout << sql << endl;
+      string sql;
+      selectToSql(query_.pRoot, sql);
+      cout << "input sql : [" << cxt_.pSql << "]" << endl;
+      cout << "output sql : [" << sql << "]" << endl;
     }
-    return (code == expectCode);
+    return (TSDB_CODE_SUCCESS == translateCode);
   }
 
 private:
   static const int max_err_len = 1024;
   static const int max_sql_len = 1024 * 1024;
 
+  void selectToSql(const SNode* node, string& sql) {
+    SSelectStmt* select = (SSelectStmt*)node;
+    sql.append("SELECT ");
+    if (select->isDistinct) {
+      sql.append("DISTINCT ");
+    }
+    if (nullptr == select->pProjectionList) {
+      sql.append("* ");
+    } else {
+      nodeListToSql(select->pProjectionList, sql);
+      sql.append(" ");
+    }
+    sql.append("FROM ");
+    tableToSql(select->pFromTable, sql);
+    if (nullptr != select->pWhere) {
+      sql.append(" WHERE ");
+      nodeToSql(select->pWhere, sql);
+    }
+  }
+
   void tableToSql(const SNode* node, string& sql) {
     const STableNode* table = (const STableNode*)node;
     switch (nodeType(node)) {
       case QUERY_NODE_REAL_TABLE: {
         SRealTableNode* realTable = (SRealTableNode*)table;
-        if ('\0' != realTable->dbName[0]) {
-          sql.append(realTable->dbName);
+        if ('\0' != realTable->table.dbName[0]) {
+          sql.append(realTable->table.dbName);
           sql.append(".");
         }
         sql.append(realTable->table.tableName);
         break;
       }
+      case QUERY_NODE_TEMP_TABLE: {
+        STempTableNode* tempTable = (STempTableNode*)table;
+        sql.append("(");
+        selectToSql(tempTable->pSubquery, sql);
+        sql.append(") ");
+        sql.append(tempTable->table.tableAlias);
+        break;
+      }
+      case QUERY_NODE_JOIN_TABLE: {
+        SJoinTableNode* joinTable = (SJoinTableNode*)table;
+        tableToSql(joinTable->pLeft, sql);
+        sql.append(" JOIN ");
+        tableToSql(joinTable->pRight, sql);
+        if (nullptr != joinTable->pOnCond) {
+          sql.append(" ON ");
+          nodeToSql(joinTable->pOnCond, sql);
+        }
+        break;
+      }
+      default:
+        break;
+    }
+  }
+
+  string opTypeToSql(EOperatorType type) {
+    switch (type) {
+      case OP_TYPE_ADD:
+        return " + ";
+      case OP_TYPE_SUB:
+        return " - ";
+      case OP_TYPE_MULTI:
+      case OP_TYPE_DIV:
+      case OP_TYPE_MOD:
+      case OP_TYPE_GREATER_THAN:
+      case OP_TYPE_GREATER_EQUAL:
+      case OP_TYPE_LOWER_THAN:
+      case OP_TYPE_LOWER_EQUAL:
+      case OP_TYPE_EQUAL:
+        return " = ";
+      case OP_TYPE_NOT_EQUAL:
+      case OP_TYPE_IN:
+      case OP_TYPE_NOT_IN:
+      case OP_TYPE_LIKE:
+      case OP_TYPE_NOT_LIKE:
+      case OP_TYPE_MATCH:
+      case OP_TYPE_NMATCH:
+      case OP_TYPE_JSON_GET_VALUE:
+      case OP_TYPE_JSON_CONTAINS:
+      default:
+        break;
+    }
+    return " unknown operator ";
+  }
+
+  void nodeToSql(const SNode* node, string& sql) {
+    if (nullptr == node) {
+      return;
+    }
+
+    switch (nodeType(node)) {
+      case QUERY_NODE_COLUMN: {
+        SColumnNode* pCol = (SColumnNode*)node;
+        if ('\0' != pCol->dbName[0]) {
+          sql.append(pCol->dbName);
+          sql.append(".");
+        }
+        if ('\0' != pCol->tableAlias[0]) {
+          sql.append(pCol->tableAlias);
+          sql.append(".");
+        }
+        sql.append(pCol->colName);
+        break;
+      }
+      case QUERY_NODE_VALUE:
+        break;
+      case QUERY_NODE_OPERATOR: {
+        SOperatorNode* pOp = (SOperatorNode*)node;
+        nodeToSql(pOp->pLeft, sql);
+        sql.append(opTypeToSql(pOp->opType));
+        nodeToSql(pOp->pRight, sql);
+        break;
+      }
       default:
         break;
     }
@@ -91,13 +194,8 @@ private:
         sql.append(", ");
       }
       firstNode = false;
-      switch (nodeType(node)) {
-        case QUERY_NODE_COLUMN:
-          sql.append(((SColumnNode*)node)->colName);
-          break;
-      }
+      nodeToSql(node, sql);
     }
-    sql.append(" ");
   }
 
   void reset() {
@@ -125,10 +223,13 @@ TEST_F(NewParserTest, selectStar) {
   bind("SELECT * FROM test.t1");
   ASSERT_TRUE(run());
 
-  bind("SELECT ts FROM t1");
+  bind("SELECT ts, c1 FROM t1");
   ASSERT_TRUE(run());
 
-  bind("SELECT ts, tag1, c1 FROM t1");
+  bind("SELECT ts, t.c1 FROM (SELECT * FROM t1) t");
+  ASSERT_TRUE(run());
+
+  bind("SELECT * FROM t1 tt1, t1 tt2 WHERE tt1.c1 = tt2.c1");
   ASSERT_TRUE(run());
 }
 
@@ -147,3 +248,16 @@ TEST_F(NewParserTest, syntaxError) {
   bind("SELECT * FROM test.t1 t WHER");
   ASSERT_TRUE(run(TSDB_CODE_FAILED));
 }
+
+TEST_F(NewParserTest, semanticError) {
+  setDatabase("root", "test");
+
+  bind("SELECT * FROM t10");
+  ASSERT_TRUE(run(TSDB_CODE_SUCCESS, TSDB_CODE_FAILED));
+
+  bind("SELECT c1, c3 FROM t1");
+  ASSERT_TRUE(run(TSDB_CODE_SUCCESS, TSDB_CODE_FAILED));
+
+  bind("SELECT c2 FROM t1 tt1, t1 tt2 WHERE tt1.c1 = tt2.c1");
+  ASSERT_TRUE(run(TSDB_CODE_SUCCESS, TSDB_CODE_FAILED));
+}
diff --git a/source/libs/qcom/src/querymsg.c b/source/libs/qcom/src/querymsg.c
index 38ce005094207b351154e368898570987295824c..e7b3d08bc5885f81bb1c62d7c157e85cf81489c6 100644
--- a/source/libs/qcom/src/querymsg.c
+++ b/source/libs/qcom/src/querymsg.c
@@ -45,11 +45,11 @@ int32_t queryBuildTableMetaReqMsg(void* input, char **msg, int32_t msgSize, int3
 
   bMsg->header.vgId = htonl(bInput->vgId);
 
-  if (bInput->dbName) {
-    tstrncpy(bMsg->dbFname, bInput->dbName, tListLen(bMsg->dbFname));
+  if (bInput->dbFName) {
+    tstrncpy(bMsg->dbFName, bInput->dbFName, tListLen(bMsg->dbFName));
   }
 
-  tstrncpy(bMsg->tableFname, bInput->tableFullName, tListLen(bMsg->tableFname));
+  tstrncpy(bMsg->tbName, bInput->tbName, tListLen(bMsg->tbName));
 
   *msgLen = (int32_t)sizeof(*bMsg);
   return TSDB_CODE_SUCCESS;
@@ -113,12 +113,19 @@ int32_t queryProcessUseDBRsp(void* output, char *msg, int32_t msgSize) {
     return TSDB_CODE_TSC_VALUE_OUT_OF_RANGE;
   }
 
-  pOut->dbVgroup.vgVersion = pRsp->vgVersion;
-  pOut->dbVgroup.hashMethod = pRsp->hashMethod;
-  pOut->dbVgroup.dbId = pRsp->uid;
-  pOut->dbVgroup.vgInfo = taosHashInit(pRsp->vgNum, taosGetDefaultHashFunction(TSDB_DATA_TYPE_INT), true, HASH_ENTRY_LOCK);
-  if (NULL == pOut->dbVgroup.vgInfo) {
-    qError("hash init[%d] failed", pRsp->vgNum);
+  pOut->dbVgroup = calloc(1, sizeof(SDBVgroupInfo));
+  if (NULL == pOut->dbVgroup) {
+    qError("calloc %d failed", (int32_t)sizeof(SDBVgroupInfo));
+    return TSDB_CODE_TSC_OUT_OF_MEMORY;
+  }
+
+  pOut->dbVgroup->vgVersion = pRsp->vgVersion;
+  pOut->dbVgroup->hashMethod = pRsp->hashMethod;
+  pOut->dbVgroup->dbId = pRsp->uid;
+  pOut->dbVgroup->vgHash = taosHashInit(pRsp->vgNum, taosGetDefaultHashFunction(TSDB_DATA_TYPE_INT), true, HASH_ENTRY_LOCK);
+  if (NULL == pOut->dbVgroup->vgHash) {
+    qError("taosHashInit %d failed", pRsp->vgNum);
+    tfree(pOut->dbVgroup);
     return TSDB_CODE_TSC_OUT_OF_MEMORY;
   }
 
@@ -131,8 +138,8 @@ int32_t queryProcessUseDBRsp(void* output, char *msg, int32_t msgSize) {
       pRsp->vgroupInfo[i].epset.eps[n].port = ntohs(pRsp->vgroupInfo[i].epset.eps[n].port);
     }
 
-    if (0 != taosHashPut(pOut->dbVgroup.vgInfo, &pRsp->vgroupInfo[i].vgId, sizeof(pRsp->vgroupInfo[i].vgId), &pRsp->vgroupInfo[i], sizeof(pRsp->vgroupInfo[i]))) {
-      qError("hash push failed");
+    if (0 != taosHashPut(pOut->dbVgroup->vgHash, &pRsp->vgroupInfo[i].vgId, sizeof(pRsp->vgroupInfo[i].vgId), &pRsp->vgroupInfo[i], sizeof(pRsp->vgroupInfo[i]))) {
+      qError("taosHashPut failed");
       goto _return;
     }
   }
@@ -142,8 +149,10 @@ int32_t queryProcessUseDBRsp(void* output, char *msg, int32_t msgSize) {
   return code;
 
 _return:
+
   if (pOut) {
-    tfree(pOut->dbVgroup.vgInfo);
+    taosHashCleanup(pOut->dbVgroup->vgHash);
+    tfree(pOut->dbVgroup);
   }
   
   return code;
@@ -248,16 +257,13 @@ int32_t queryProcessTableMetaRsp(void* output, char *msg, int32_t msgSize) {
     return TSDB_CODE_TSC_INVALID_VALUE;
   }
 
+  strcpy(pOut->dbFName, pMetaMsg->dbFName);
+
   if (pMetaMsg->tableType == TSDB_CHILD_TABLE) {
     SET_META_TYPE_BOTH_TABLE(pOut->metaType);
 
-    if (pMetaMsg->dbFname[0]) {
-      snprintf(pOut->ctbFname, sizeof(pOut->ctbFname), "%s.%s", pMetaMsg->dbFname, pMetaMsg->tbFname);
-      snprintf(pOut->tbFname, sizeof(pOut->tbFname), "%s.%s", pMetaMsg->dbFname, pMetaMsg->stbFname);
-    } else {
-      memcpy(pOut->ctbFname, pMetaMsg->tbFname, sizeof(pOut->ctbFname));
-      memcpy(pOut->tbFname, pMetaMsg->stbFname, sizeof(pOut->tbFname));
-    }
+    strcpy(pOut->ctbName, pMetaMsg->tbName);
+    strcpy(pOut->tbName, pMetaMsg->stbName);
     
     pOut->ctbMeta.vgId = pMetaMsg->vgId;
     pOut->ctbMeta.tableType = pMetaMsg->tableType;
@@ -268,11 +274,7 @@ int32_t queryProcessTableMetaRsp(void* output, char *msg, int32_t msgSize) {
   } else {
     SET_META_TYPE_TABLE(pOut->metaType);
     
-    if (pMetaMsg->dbFname[0]) {
-      snprintf(pOut->tbFname, sizeof(pOut->tbFname), "%s.%s", pMetaMsg->dbFname, pMetaMsg->tbFname);
-    } else {
-      memcpy(pOut->tbFname, pMetaMsg->tbFname, sizeof(pOut->tbFname));
-    }
+    strcpy(pOut->tbName, pMetaMsg->tbName);
     
     code = queryCreateTableMetaFromMsg(pMetaMsg, (pMetaMsg->tableType == TSDB_SUPER_TABLE), &pOut->tbMeta);
   }
@@ -291,4 +293,4 @@ void initQueryModuleMsgHandle() {
   queryProcessMsgRsp[TMSG_INDEX(TDMT_MND_USE_DB)] = queryProcessUseDBRsp;
 }
 
-#pragma GCC diagnostic pop
\ No newline at end of file
+#pragma GCC diagnostic pop
diff --git a/source/libs/qworker/src/qworker.c b/source/libs/qworker/src/qworker.c
index 8705bc23b9c123ea0ac9c95266f4686f7474f66b..cebe8178d9303e330bbbd21a211fe34c95ed3b2a 100644
--- a/source/libs/qworker/src/qworker.c
+++ b/source/libs/qworker/src/qworker.c
@@ -561,7 +561,7 @@ int32_t qwGetResFromSink(QW_FPARAMS_DEF, SQWTaskCtx *ctx, int32_t *dataLen, void
       
       QW_ERR_RET(qwUpdateTaskStatus(QW_FPARAMS(), JOB_TASK_STATUS_SUCCEED));
 
-      QW_ERR_RET(qwMallocFetchRsp(len, &rsp));      
+      QW_ERR_RET(qwMallocFetchRsp(len, &rsp));
       *rspMsg = rsp;
       *dataLen = 0;
       
@@ -573,7 +573,7 @@ int32_t qwGetResFromSink(QW_FPARAMS_DEF, SQWTaskCtx *ctx, int32_t *dataLen, void
     QW_TASK_DLOG("no res data in sink, need response later, queryEnd:%d", queryEnd);
 
     return TSDB_CODE_SUCCESS;
-  }  
+  }
 
 
   // Got data from sink
diff --git a/source/libs/scheduler/inc/schedulerInt.h b/source/libs/scheduler/inc/schedulerInt.h
index f5e3ef996360aa68726e06d819cde941b5873ea4..94c833307f898462bd33c8b72f92b814c6eebecd 100644
--- a/source/libs/scheduler/inc/schedulerInt.h
+++ b/source/libs/scheduler/inc/schedulerInt.h
@@ -132,7 +132,7 @@ typedef struct SSchJob {
   SQueryProfileSummary summary;
 } SSchJob;
 
-#define SCH_TASK_READY_TO_LUNCH(task) (atomic_load_32(&(task)->childReady) >= taosArrayGetSize((task)->children))
+#define SCH_TASK_READY_TO_LUNCH(readyNum, task) ((readyNum) >= taosArrayGetSize((task)->children))
 
 #define SCH_IS_DATA_SRC_TASK(task) ((task)->plan->type == QUERY_TYPE_SCAN)
 #define SCH_TASK_NEED_WAIT_ALL(task) ((task)->plan->type == QUERY_TYPE_MODIFY)
diff --git a/source/libs/scheduler/src/scheduler.c b/source/libs/scheduler/src/scheduler.c
index 25137beed99027107b427965d957bf0c2db8ed01..1b6d871274d5f3a6d35b74d039daec576c96ac75 100644
--- a/source/libs/scheduler/src/scheduler.c
+++ b/source/libs/scheduler/src/scheduler.c
@@ -773,14 +773,14 @@ int32_t schProcessOnTaskSuccess(SSchJob *pJob, SSchTask *pTask) {
     SSchTask *par = *(SSchTask **)taosArrayGet(pTask->parents, i);
     pErrTask = par;
     
-    atomic_add_fetch_32(&par->childReady, 1);
+    int32_t readyNum = atomic_add_fetch_32(&par->childReady, 1);
 
     SCH_LOCK(SCH_WRITE, &par->lock);
     SDownstreamSource source = {.taskId = pTask->taskId, .schedId = schMgmt.sId, .addr = pTask->succeedAddr};
     qSetSubplanExecutionNode(par->plan, pTask->plan->id.templateId, &source);
     SCH_UNLOCK(SCH_WRITE, &par->lock);
     
-    if (SCH_TASK_READY_TO_LUNCH(par)) {
+    if (SCH_TASK_READY_TO_LUNCH(readyNum, par)) {
       SCH_ERR_RET(schLaunchTask(pJob, par));
     }
   }
@@ -1409,7 +1409,7 @@ int32_t schedulerAsyncExecJob(void *transport, SArray *pNodeList, SQueryDag* pDa
 }
 
 int32_t schedulerConvertDagToTaskList(SQueryDag* pDag, SArray **pTasks) {
-  if (NULL == pDag || pDag->numOfSubplans <= 0 || taosArrayGetSize(pDag->pSubplans) <= 0) {
+  if (NULL == pDag || pDag->numOfSubplans <= 0 || taosArrayGetSize(pDag->pSubplans) == 0) {
     SCH_ERR_RET(TSDB_CODE_QRY_INVALID_INPUT);
   }
 
@@ -1454,7 +1454,6 @@ int32_t schedulerConvertDagToTaskList(SQueryDag* pDag, SArray **pTasks) {
     }
     
     SSubQueryMsg* pMsg = calloc(1, msgSize);
-    memcpy(pMsg->msg, msg, msgLen);
     
     pMsg->header.vgId = tInfo.addr.nodeId;
     
@@ -1464,6 +1463,7 @@ int32_t schedulerConvertDagToTaskList(SQueryDag* pDag, SArray **pTasks) {
     pMsg->taskType = TASK_TYPE_PERSISTENT;
     pMsg->phyLen   = msgLen;
     pMsg->sqlLen   = 0;
+    memcpy(pMsg->msg, msg, msgLen);
     /*memcpy(pMsg->msg, ((SSubQueryMsg*)msg)->msg, msgLen);*/
 
     tInfo.msg = pMsg;
diff --git a/source/libs/transport/inc/transComm.h b/source/libs/transport/inc/transComm.h
index f4fe0b1f79fb905f2f0ef6616b6fcfd3066fb729..082c89fed498e243d71d569823f07d3d99cd3d6c 100644
--- a/source/libs/transport/inc/transComm.h
+++ b/source/libs/transport/inc/transComm.h
@@ -213,6 +213,12 @@ typedef struct SConnBuffer {
 
 typedef void (*AsyncCB)(uv_async_t* handle);
 
+typedef struct {
+  void*           pThrd;
+  queue           qmsg;
+  pthread_mutex_t mtx;  // protect qmsg;
+} SAsyncItem;
+
 typedef struct {
   int         index;
   int         nAsync;
@@ -221,7 +227,7 @@ typedef struct {
 
 SAsyncPool* transCreateAsyncPool(uv_loop_t* loop, void* arg, AsyncCB cb);
 void        transDestroyAsyncPool(SAsyncPool* pool);
-int         transSendAsync(SAsyncPool* pool);
+int         transSendAsync(SAsyncPool* pool, queue* mq);
 
 int transInitBuffer(SConnBuffer* buf);
 int transClearBuffer(SConnBuffer* buf);
diff --git a/source/libs/transport/src/transCli.c b/source/libs/transport/src/transCli.c
index 5037de1407e3b9ff6d2a6feeda201b5cb702839a..24ff5e956a190bfa5cff1179623e3a8c9dba1ac5 100644
--- a/source/libs/transport/src/transCli.c
+++ b/source/libs/transport/src/transCli.c
@@ -432,14 +432,15 @@ static void clientHandleReq(SCliMsg* pMsg, SCliThrdObj* pThrd) {
   }
 }
 static void clientAsyncCb(uv_async_t* handle) {
-  SCliThrdObj* pThrd = handle->data;
+  SAsyncItem*  item = handle->data;
+  SCliThrdObj* pThrd = item->pThrd;
   SCliMsg*     pMsg = NULL;
   queue        wq;
 
   // batch process to avoid to lock/unlock frequently
-  pthread_mutex_lock(&pThrd->msgMtx);
-  QUEUE_MOVE(&pThrd->msg, &wq);
-  pthread_mutex_unlock(&pThrd->msgMtx);
+  pthread_mutex_lock(&item->mtx);
+  QUEUE_MOVE(&item->qmsg, &wq);
+  pthread_mutex_unlock(&item->mtx);
 
   int count = 0;
   while (!QUEUE_IS_EMPTY(&wq)) {
@@ -548,11 +549,11 @@ static void clientSendQuit(SCliThrdObj* thrd) {
   SCliMsg* msg = calloc(1, sizeof(SCliMsg));
   msg->ctx = NULL;  //
 
-  pthread_mutex_lock(&thrd->msgMtx);
-  QUEUE_PUSH(&thrd->msg, &msg->q);
-  pthread_mutex_unlock(&thrd->msgMtx);
+  // pthread_mutex_lock(&thrd->msgMtx);
+  // QUEUE_PUSH(&thrd->msg, &msg->q);
+  // pthread_mutex_unlock(&thrd->msgMtx);
 
-  transSendAsync(thrd->asyncPool);
+  transSendAsync(thrd->asyncPool, &msg->q);
   // uv_async_send(thrd->cliAsync);
 }
 void taosCloseClient(void* arg) {
@@ -598,14 +599,14 @@ void rpcSendRequest(void* shandle, const SEpSet* pEpSet, SRpcMsg* pMsg, int64_t*
 
   SCliThrdObj* thrd = ((SClientObj*)pRpc->tcphandle)->pThreadObj[index % pRpc->numOfThreads];
 
-  pthread_mutex_lock(&thrd->msgMtx);
-  QUEUE_PUSH(&thrd->msg, &cliMsg->q);
-  pthread_mutex_unlock(&thrd->msgMtx);
+  // pthread_mutex_lock(&thrd->msgMtx);
+  // QUEUE_PUSH(&thrd->msg, &cliMsg->q);
+  // pthread_mutex_unlock(&thrd->msgMtx);
 
-  int start = taosGetTimestampUs();
-  transSendAsync(thrd->asyncPool);
+  // int start = taosGetTimestampUs();
+  transSendAsync(thrd->asyncPool, &(cliMsg->q));
   // uv_async_send(thrd->cliAsync);
-  int end = taosGetTimestampUs() - start;
+  // int end = taosGetTimestampUs() - start;
   // tError("client sent to rpc, time cost: %d", (int)end);
 }
 #endif
diff --git a/source/libs/transport/src/transComm.c b/source/libs/transport/src/transComm.c
index 47eabd4320a8c8f6930cd3098694daee4a52ad3d..d0e504a0a1ee7a7643f7a575bdc6b04db83d59bb 100644
--- a/source/libs/transport/src/transComm.c
+++ b/source/libs/transport/src/transComm.c
@@ -247,7 +247,7 @@ int transDestroyBuffer(SConnBuffer* buf) {
 }
 
 SAsyncPool* transCreateAsyncPool(uv_loop_t* loop, void* arg, AsyncCB cb) {
-  static int sz = 20;
+  static int sz = 10;
 
   SAsyncPool* pool = calloc(1, sizeof(SAsyncPool));
   pool->index = 0;
@@ -257,24 +257,46 @@ SAsyncPool* transCreateAsyncPool(uv_loop_t* loop, void* arg, AsyncCB cb) {
   for (int i = 0; i < pool->nAsync; i++) {
     uv_async_t* async = &(pool->asyncs[i]);
     uv_async_init(loop, async, cb);
-    async->data = arg;
+
+    SAsyncItem* item = calloc(1, sizeof(SAsyncItem));
+    item->pThrd = arg;
+    QUEUE_INIT(&item->qmsg);
+    pthread_mutex_init(&item->mtx, NULL);
+
+    async->data = item;
   }
   return pool;
 }
 void transDestroyAsyncPool(SAsyncPool* pool) {
   for (int i = 0; i < pool->nAsync; i++) {
     uv_async_t* async = &(pool->asyncs[i]);
+
+    SAsyncItem* item = async->data;
+    pthread_mutex_destroy(&item->mtx);
+    free(item);
   }
   free(pool->asyncs);
   free(pool);
 }
-int transSendAsync(SAsyncPool* pool) {
+int transSendAsync(SAsyncPool* pool, queue* q) {
   int idx = pool->index;
   idx = idx % pool->nAsync;
   // no need mutex here
   if (pool->index++ > pool->nAsync) {
     pool->index = 0;
   }
-  return uv_async_send(&(pool->asyncs[idx]));
+  uv_async_t* async = &(pool->asyncs[idx]);
+  SAsyncItem* item = async->data;
+
+  int64_t st = taosGetTimestampUs();
+  pthread_mutex_lock(&item->mtx);
+  QUEUE_PUSH(&item->qmsg, q);
+  pthread_mutex_unlock(&item->mtx);
+  int64_t el = taosGetTimestampUs() - st;
+  if (el > 50) {
+    // tInfo("lock and unlock cost: %d", (int)el);
+  }
+
+  return uv_async_send(async);
 }
 #endif
diff --git a/source/libs/transport/src/transSrv.c b/source/libs/transport/src/transSrv.c
index 826b91dc029fbec23bf26c4d370a0b50eca9e571..a005b31fe4a505c847f5889159b067d91b64b7ee 100644
--- a/source/libs/transport/src/transSrv.c
+++ b/source/libs/transport/src/transSrv.c
@@ -376,13 +376,15 @@ static void destroySmsg(SSrvMsg* smsg) {
   free(smsg);
 }
 void uvWorkerAsyncCb(uv_async_t* handle) {
-  SWorkThrdObj* pThrd = handle->data;
+  SAsyncItem*   item = handle->data;
+  SWorkThrdObj* pThrd = item->pThrd;
   SSrvConn*     conn = NULL;
   queue         wq;
   // batch process to avoid to lock/unlock frequently
-  pthread_mutex_lock(&pThrd->msgMtx);
-  QUEUE_MOVE(&pThrd->msg, &wq);
-  pthread_mutex_unlock(&pThrd->msgMtx);
+  pthread_mutex_lock(&item->mtx);
+  QUEUE_MOVE(&item->qmsg, &wq);
+  pthread_mutex_unlock(&item->mtx);
+  // pthread_mutex_unlock(&mtx);
 
   while (!QUEUE_IS_EMPTY(&wq)) {
     queue* head = QUEUE_HEAD(&wq);
@@ -539,7 +541,7 @@ static bool addHandleToAcceptloop(void* arg) {
     tError("failed to bind: %s", uv_err_name(err));
     return false;
   }
-  if ((err = uv_listen((uv_stream_t*)&srv->server, 128, uvOnAcceptCb)) != 0) {
+  if ((err = uv_listen((uv_stream_t*)&srv->server, 512, uvOnAcceptCb)) != 0) {
     tError("failed to listen: %s", uv_err_name(err));
     return false;
   }
@@ -671,12 +673,12 @@ void destroyWorkThrd(SWorkThrdObj* pThrd) {
 void sendQuitToWorkThrd(SWorkThrdObj* pThrd) {
   SSrvMsg* srvMsg = calloc(1, sizeof(SSrvMsg));
 
-  pthread_mutex_lock(&pThrd->msgMtx);
-  QUEUE_PUSH(&pThrd->msg, &srvMsg->q);
-  pthread_mutex_unlock(&pThrd->msgMtx);
+  // pthread_mutex_lock(&pThrd->msgMtx);
+  // QUEUE_PUSH(&pThrd->msg, &srvMsg->q);
+  // pthread_mutex_unlock(&pThrd->msgMtx);
   tDebug("send quit msg to work thread");
 
-  transSendAsync(pThrd->asyncPool);
+  transSendAsync(pThrd->asyncPool, &srvMsg->q);
   // uv_async_send(pThrd->workerAsync);
 }
 
@@ -712,12 +714,12 @@ void rpcSendResponse(const SRpcMsg* pMsg) {
   srvMsg->pConn = pConn;
   srvMsg->msg = *pMsg;
 
-  pthread_mutex_lock(&pThrd->msgMtx);
-  QUEUE_PUSH(&pThrd->msg, &srvMsg->q);
-  pthread_mutex_unlock(&pThrd->msgMtx);
+  // pthread_mutex_lock(&pThrd->msgMtx);
+  // QUEUE_PUSH(&pThrd->msg, &srvMsg->q);
+  // pthread_mutex_unlock(&pThrd->msgMtx);
 
   tDebug("conn %p start to send resp", pConn);
-  transSendAsync(pThrd->asyncPool);
+  transSendAsync(pThrd->asyncPool, &srvMsg->q);
   // uv_async_send(pThrd->workerAsync);
 }
 
diff --git a/source/nodes/src/nodesTraverseFuncs.c b/source/nodes/src/nodesTraverseFuncs.c
index ffe40073e65d8f4d08c371676394b88d7ffe4ac1..444ff7cbcf5f21c98c734603343a9eb1938b8d65 100644
--- a/source/nodes/src/nodesTraverseFuncs.c
+++ b/source/nodes/src/nodesTraverseFuncs.c
@@ -15,68 +15,101 @@
 
 #include "nodes.h"
 
-typedef bool (*FQueryNodeWalker)(SNode* pNode, void* pContext);
+typedef enum ETraversalOrder {
+  TRAVERSAL_PREORDER = 1,
+  TRAVERSAL_POSTORDER
+} ETraversalOrder;
 
-bool nodesWalkNodeList(SNodeList* pNodeList, FQueryNodeWalker walker, void* pContext) {
-  SNode* node;
-  FOREACH(node, pNodeList) {
-    if (!nodesWalkNode(node, walker, pContext)) {
-      return false;
-    }
-  }
-  return true;
-}
+static bool walkList(SNodeList* pNodeList, ETraversalOrder order, FQueryNodeWalker walker, void* pContext);
 
-bool nodesWalkNode(SNode* pNode, FQueryNodeWalker walker, void* pContext) {
+static bool walkNode(SNode* pNode, ETraversalOrder order, FQueryNodeWalker walker, void* pContext) {
   if (NULL == pNode) {
     return true;
   }
 
-  if (!walker(pNode, pContext)) {
+  if (TRAVERSAL_PREORDER == order && !walker(pNode, pContext)) {
     return false;
   }
 
+  bool res = true;
   switch (nodeType(pNode)) {
     case QUERY_NODE_COLUMN:
     case QUERY_NODE_VALUE:
     case QUERY_NODE_LIMIT:
       // these node types with no subnodes
-      return true;
+      break;
     case QUERY_NODE_OPERATOR: {
       SOperatorNode* pOpNode = (SOperatorNode*)pNode;
-      if (!nodesWalkNode(pOpNode->pLeft, walker, pContext)) {
-        return false;
+      res = walkNode(pOpNode->pLeft, order, walker, pContext);
+      if (res) {
+        res = walkNode(pOpNode->pRight, order, walker, pContext);
       }
-      return nodesWalkNode(pOpNode->pRight, walker, pContext);
+      break;
     }
     case QUERY_NODE_LOGIC_CONDITION:
-      return nodesWalkNodeList(((SLogicConditionNode*)pNode)->pParameterList, walker, pContext);
+      res = walkList(((SLogicConditionNode*)pNode)->pParameterList, order, walker, pContext);
+      break;
     case QUERY_NODE_IS_NULL_CONDITION:
-      return nodesWalkNode(((SIsNullCondNode*)pNode)->pExpr, walker, pContext);
+      res = walkNode(((SIsNullCondNode*)pNode)->pExpr, order, walker, pContext);
+      break;
     case QUERY_NODE_FUNCTION:
-      return nodesWalkNodeList(((SFunctionNode*)pNode)->pParameterList, walker, pContext);
+      res = walkList(((SFunctionNode*)pNode)->pParameterList, order, walker, pContext);
+      break;
     case QUERY_NODE_REAL_TABLE:
     case QUERY_NODE_TEMP_TABLE:
-      return true; // todo
+      break; // todo
     case QUERY_NODE_JOIN_TABLE: {
       SJoinTableNode* pJoinTableNode = (SJoinTableNode*)pNode;
-      if (!nodesWalkNode(pJoinTableNode->pLeft, walker, pContext)) {
-        return false;
+      res = walkNode(pJoinTableNode->pLeft, order, walker, pContext);
+      if (res) {
+        res = walkNode(pJoinTableNode->pRight, order, walker, pContext);
       }
-      if (!nodesWalkNode(pJoinTableNode->pRight, walker, pContext)) {
-        return false;
+      if (res) {
+        res = walkNode(pJoinTableNode->pOnCond, order, walker, pContext);
       }
-      return nodesWalkNode(pJoinTableNode->pOnCond, walker, pContext);
+      break;
     }
     case QUERY_NODE_GROUPING_SET:
-      return nodesWalkNodeList(((SGroupingSetNode*)pNode)->pParameterList, walker, pContext);
+      res = walkList(((SGroupingSetNode*)pNode)->pParameterList, order, walker, pContext);
+      break;
     case QUERY_NODE_ORDER_BY_EXPR:
-      return nodesWalkNode(((SOrderByExprNode*)pNode)->pExpr, walker, pContext);
+      res = walkNode(((SOrderByExprNode*)pNode)->pExpr, order, walker, pContext);
+      break;
     default:
       break;
   }
 
-  return false;
+  if (res && TRAVERSAL_POSTORDER == order) {
+    res = walker(pNode, pContext);
+  }
+
+  return res;
+}
+
+static bool walkList(SNodeList* pNodeList, ETraversalOrder order, FQueryNodeWalker walker, void* pContext) {
+  SNode* node;
+  FOREACH(node, pNodeList) {
+    if (!walkNode(node, order, walker, pContext)) {
+      return false;
+    }
+  }
+  return true;
+}
+
+void nodesWalkNode(SNode* pNode, FQueryNodeWalker walker, void* pContext) {
+  (void)walkNode(pNode, TRAVERSAL_PREORDER, walker, pContext);
+}
+
+void nodesWalkList(SNodeList* pNodeList, FQueryNodeWalker walker, void* pContext) {
+  (void)walkList(pNodeList, TRAVERSAL_PREORDER, walker, pContext);
+}
+
+void nodesWalkNodePostOrder(SNode* pNode, FQueryNodeWalker walker, void* pContext) {
+  (void)walkNode(pNode, TRAVERSAL_POSTORDER, walker, pContext);
+}
+
+void nodesWalkListPostOrder(SNodeList* pList, FQueryNodeWalker walker, void* pContext) {
+  (void)walkList(pList, TRAVERSAL_PREORDER, walker, pContext);
 }
 
 bool nodesWalkStmt(SNode* pNode, FQueryNodeWalker walker, void* pContext) {
diff --git a/tests/parallel_test/Jenkinsfile b/tests/parallel_test/Jenkinsfile
new file mode 100644
index 0000000000000000000000000000000000000000..fc2b3562c15a3babf7bc3a5820e65ec8e162e6d7
--- /dev/null
+++ b/tests/parallel_test/Jenkinsfile
@@ -0,0 +1,200 @@
+import hudson.model.Result
+import hudson.model.*;
+import jenkins.model.CauseOfInterruption
+node {
+}
+
+def skipbuild=0
+def win_stop=0
+
+def abortPreviousBuilds() {
+  def currentJobName = env.JOB_NAME
+  def currentBuildNumber = env.BUILD_NUMBER.toInteger()
+  def jobs = Jenkins.instance.getItemByFullName(currentJobName)
+  def builds = jobs.getBuilds()
+
+  for (build in builds) {
+    if (!build.isBuilding()) {
+      continue;
+    }
+
+    if (currentBuildNumber == build.getNumber().toInteger()) {
+      continue;
+    }
+
+    build.doKill()    //doTerm(),doKill(),doTerm()
+  }
+}
+//  abort previous build
+abortPreviousBuilds()
+def abort_previous(){
+  def buildNumber = env.BUILD_NUMBER as int
+  if (buildNumber > 1) milestone(buildNumber - 1)
+  milestone(buildNumber)
+}
+def pre_test(){
+    sh'hostname'
+    sh '''
+    sudo rmtaos || echo "taosd has not installed"
+    '''
+    sh '''
+    killall -9 taosd ||echo "no taosd running"
+    killall -9 gdb || echo "no gdb running"
+    killall -9 python3.8 || echo "no python program running"
+    cd ${WKC}
+    '''
+    script {
+      if (env.CHANGE_TARGET == 'master') {
+        sh '''
+        cd ${WKC}
+        git checkout master
+        '''
+        }
+      else if(env.CHANGE_TARGET == '2.0'){
+        sh '''
+        cd ${WKC}
+        git checkout 2.0
+        '''
+      }
+      else if(env.CHANGE_TARGET == '3.0'){
+        sh '''
+        cd ${WKC}
+        git checkout 3.0
+        '''
+      } 
+      else{
+        sh '''
+        cd ${WKC}
+        git checkout develop
+        '''
+      }
+    }
+    sh'''
+    cd ${WKC}
+    git pull >/dev/null
+    git fetch origin +refs/pull/${CHANGE_ID}/merge
+    git checkout -qf FETCH_HEAD
+    export TZ=Asia/Harbin
+    date
+    rm -rf debug
+    mkdir debug
+    cd debug
+    cmake .. > /dev/null
+    make -j4> /dev/null
+
+    '''
+    return 1
+}
+
+pipeline {
+  agent none
+  options { skipDefaultCheckout() } 
+  environment{
+      WK = '/var/lib/jenkins/workspace/TDinternal'
+      WKC= '/var/lib/jenkins/workspace/TDengine'
+  }
+  stages {
+      stage('pre_build'){
+          agent{label 'slave3_0'}
+          options { skipDefaultCheckout() } 
+          when {
+              changeRequest()
+          }
+          steps {
+            script{
+              abort_previous()
+              abortPreviousBuilds()
+            }
+            timeout(time: 45, unit: 'MINUTES'){
+              pre_test()
+              sh'''
+              cd ${WKC}/tests
+              ./test-all.sh b1fq
+              '''
+              sh'''
+              cd ${WKC}/debug
+              ctest
+              '''
+            }
+          }
+      }
+  }
+  post {  
+        success {
+            emailext (
+                subject: "PR-result: Job '${env.JOB_NAME} [${env.BUILD_NUMBER}]' SUCCESS",
+                body: """<!DOCTYPE html>
+                <html>
+                <head>
+                <meta charset="UTF-8">
+                </head>
+                <body leftmargin="8" marginwidth="0" topmargin="8" marginheight="4" offset="0">
+                    <table width="95%" cellpadding="0" cellspacing="0" style="font-size: 16pt; font-family: Tahoma, Arial, Helvetica, sans-serif">
+                        <tr>
+                            <td><br />
+                                <b><font color="#0B610B"><font size="6">构建信息</font></font></b>
+                                <hr size="2" width="100%" align="center" /></td>
+                        </tr>
+                        <tr>
+                            <td>
+                                <ul>
+                                <div style="font-size:18px">
+                                    <li>构建名称>>分支：${env.BRANCH_NAME}</li>
+                                    <li>构建结果：<span style="color:green"> Successful </span></li>
+                                    <li>构建编号：${BUILD_NUMBER}</li>
+                                    <li>触发用户：${env.CHANGE_AUTHOR}</li>
+                                    <li>提交信息：${env.CHANGE_TITLE}</li>
+                                    <li>构建地址：<a href=${BUILD_URL}>${BUILD_URL}</a></li>
+                                    <li>构建日志：<a href=${BUILD_URL}console>${BUILD_URL}console</a></li>
+                                    
+                                </div>
+                                </ul>
+                            </td>
+                        </tr>
+                    </table></font>
+                </body>
+                </html>""",
+                to: "${env.CHANGE_AUTHOR_EMAIL}",
+                from: "support@taosdata.com"
+            )
+        }
+        failure {
+            emailext (
+                subject: "PR-result: Job '${env.JOB_NAME} [${env.BUILD_NUMBER}]' FAIL",
+                body: """<!DOCTYPE html>
+                <html>
+                <head>
+                <meta charset="UTF-8">
+                </head>
+                <body leftmargin="8" marginwidth="0" topmargin="8" marginheight="4" offset="0">
+                    <table width="95%" cellpadding="0" cellspacing="0" style="font-size: 16pt; font-family: Tahoma, Arial, Helvetica, sans-serif">
+                        <tr>
+                            <td><br />
+                                <b><font color="#0B610B"><font size="6">构建信息</font></font></b>
+                                <hr size="2" width="100%" align="center" /></td>
+                        </tr>
+                        <tr>
+                            <td>
+                                <ul>
+                                <div style="font-size:18px">
+                                    <li>构建名称>>分支：${env.BRANCH_NAME}</li>
+                                    <li>构建结果：<span style="color:red"> Failure </span></li>
+                                    <li>构建编号：${BUILD_NUMBER}</li>
+                                    <li>触发用户：${env.CHANGE_AUTHOR}</li>
+                                    <li>提交信息：${env.CHANGE_TITLE}</li>
+                                    <li>构建地址：<a href=${BUILD_URL}>${BUILD_URL}</a></li>
+                                    <li>构建日志：<a href=${BUILD_URL}console>${BUILD_URL}console</a></li>
+                                    
+                                </div>
+                                </ul>
+                            </td>
+                        </tr>
+                    </table></font>
+                </body>
+                </html>""",
+                to: "${env.CHANGE_AUTHOR_EMAIL}",
+                from: "support@taosdata.com"
+            )
+        }
+    } 
+}