diff --git a/src/client/src/tscLocal.c b/src/client/src/tscLocal.c
index 5ffdcd216780368e54903d413aa8c530b49136da..3835cda2a76967fafe850bd1c4943872ac4a7a89 100644
--- a/src/client/src/tscLocal.c
+++ b/src/client/src/tscLocal.c
@@ -26,7 +26,7 @@
 #include "tschemautil.h"
 #include "tname.h"
 
-static void tscSetLocalQueryResult(SSqlObj *pSql, const char *val, const char *columnName, size_t valueLength);
+static void tscSetLocalQueryResult(SSqlObj *pSql, const char *val, const char *columnName, int16_t type, size_t valueLength);
 
 static int32_t getToStringLength(const char *pData, int32_t length, int32_t type) {
   char buf[512] = {0};
@@ -275,22 +275,37 @@ static void tscProcessCurrentUser(SSqlObj *pSql) {
   SQueryInfo* pQueryInfo = tscGetQueryInfoDetail(&pSql->cmd, 0);
   
   SSqlExpr* pExpr = taosArrayGetP(pQueryInfo->exprList, 0);
-  tscSetLocalQueryResult(pSql, pSql->pTscObj->user, pExpr->aliasName, TSDB_USER_LEN);
+  pExpr->resBytes = TSDB_USER_LEN + TSDB_DATA_TYPE_BINARY;
+  pExpr->resType = TSDB_DATA_TYPE_BINARY;
+  
+  char* vx = calloc(1, pExpr->resBytes);
+  STR_WITH_MAXSIZE_TO_VARSTR(vx, pSql->pTscObj->user, TSDB_USER_LEN);
+  
+  tscSetLocalQueryResult(pSql, vx, pExpr->aliasName, pExpr->resType, pExpr->resBytes);
+  free(vx);
 }
 
 static void tscProcessCurrentDB(SSqlObj *pSql) {
   char db[TSDB_DB_NAME_LEN + 1] = {0};
   extractDBName(pSql->pTscObj->db, db);
   
-  // no use db is invoked before.
-  if (strlen(db) == 0) {
-    setNull(db, TSDB_DATA_TYPE_BINARY, TSDB_DB_NAME_LEN);
-  }
-  
   SQueryInfo* pQueryInfo = tscGetQueryInfoDetail(&pSql->cmd, 0);
   
   SSqlExpr* pExpr = taosArrayGetP(pQueryInfo->exprList, 0);
-  tscSetLocalQueryResult(pSql, db, pExpr->aliasName, TSDB_DB_NAME_LEN);
+  pExpr->resType = TSDB_DATA_TYPE_BINARY;
+  
+  size_t t = strlen(db);
+  pExpr->resBytes = TSDB_DB_NAME_LEN + VARSTR_HEADER_SIZE;
+  
+  char* vx = calloc(1, pExpr->resBytes);
+  if (t == 0) {
+    setVardataNull(vx, TSDB_DATA_TYPE_BINARY);
+  } else {
+    STR_WITH_SIZE_TO_VARSTR(vx, db, t);
+  }
+  
+  tscSetLocalQueryResult(pSql, vx, pExpr->aliasName, pExpr->resType, pExpr->resBytes);
+  free(vx);
 }
 
 static void tscProcessServerVer(SSqlObj *pSql) {
@@ -298,14 +313,32 @@ static void tscProcessServerVer(SSqlObj *pSql) {
   SQueryInfo* pQueryInfo = tscGetQueryInfoDetail(&pSql->cmd, 0);
   
   SSqlExpr* pExpr = taosArrayGetP(pQueryInfo->exprList, 0);
-  tscSetLocalQueryResult(pSql, v, pExpr->aliasName, tListLen(pSql->pTscObj->sversion));
+  pExpr->resType = TSDB_DATA_TYPE_BINARY;
+  
+  size_t t = strlen(v);
+  pExpr->resBytes = t + VARSTR_HEADER_SIZE;
+  
+  char* vx = calloc(1, pExpr->resBytes);
+  STR_WITH_SIZE_TO_VARSTR(vx, v, t);
+  tscSetLocalQueryResult(pSql, vx, pExpr->aliasName, pExpr->resType, pExpr->resBytes);
+  
+  tfree(vx);
 }
 
 static void tscProcessClientVer(SSqlObj *pSql) {
   SQueryInfo* pQueryInfo = tscGetQueryInfoDetail(&pSql->cmd, 0);
   
   SSqlExpr* pExpr = taosArrayGetP(pQueryInfo->exprList, 0);
-  tscSetLocalQueryResult(pSql, version, pExpr->aliasName, strlen(version));
+  pExpr->resType = TSDB_DATA_TYPE_BINARY;
+  
+  size_t t = strlen(version);
+  pExpr->resBytes = t + VARSTR_HEADER_SIZE;
+  
+  char* v = calloc(1, pExpr->resBytes);
+  STR_WITH_SIZE_TO_VARSTR(v, version, t);
+  tscSetLocalQueryResult(pSql, v, pExpr->aliasName, pExpr->resType, pExpr->resBytes);
+  
+  tfree(v);
 }
 
 static void tscProcessServStatus(SSqlObj *pSql) {
@@ -325,10 +358,11 @@ static void tscProcessServStatus(SSqlObj *pSql) {
   SQueryInfo* pQueryInfo = tscGetQueryInfoDetail(&pSql->cmd, 0);
   
   SSqlExpr* pExpr = taosArrayGetP(pQueryInfo->exprList, 0);
-  tscSetLocalQueryResult(pSql, "1", pExpr->aliasName, 2);
+  int32_t val = 1;
+  tscSetLocalQueryResult(pSql, (char*) &val, pExpr->aliasName, TSDB_DATA_TYPE_INT, sizeof(int32_t));
 }
 
-void tscSetLocalQueryResult(SSqlObj *pSql, const char *val, const char *columnName, size_t valueLength) {
+void tscSetLocalQueryResult(SSqlObj *pSql, const char *val, const char *columnName, int16_t type, size_t valueLength) {
   SSqlCmd *pCmd = &pSql->cmd;
   SSqlRes *pRes = &pSql->res;
 
@@ -338,8 +372,10 @@ void tscSetLocalQueryResult(SSqlObj *pSql, const char *val, const char *columnNa
   pQueryInfo->order.order = TSDB_ORDER_ASC;
   
   tscFieldInfoClear(&pQueryInfo->fieldsInfo);
+  pQueryInfo->fieldsInfo.pFields = taosArrayInit(1, sizeof(TAOS_FIELD));
+  pQueryInfo->fieldsInfo.pSupportInfo = taosArrayInit(1, sizeof(SFieldSupInfo));
   
-  TAOS_FIELD f = tscCreateField(TSDB_DATA_TYPE_BINARY, columnName, valueLength);
+  TAOS_FIELD f = tscCreateField(type, columnName, valueLength);
   tscFieldInfoAppend(&pQueryInfo->fieldsInfo, &f);
   
   tscInitResObjForLocalQuery(pSql, 1, valueLength);
@@ -348,7 +384,7 @@ void tscSetLocalQueryResult(SSqlObj *pSql, const char *val, const char *columnNa
   SFieldSupInfo* pInfo = tscFieldInfoGetSupp(&pQueryInfo->fieldsInfo, 0);
   pInfo->pSqlExpr = taosArrayGetP(pQueryInfo->exprList, 0);
   
-  strncpy(pRes->data, val, pField->bytes);
+  memcpy(pRes->data, val, pField->bytes);
 }
 
 int tscProcessLocalCmd(SSqlObj *pSql) {
@@ -385,7 +421,7 @@ int tscProcessLocalCmd(SSqlObj *pSql) {
   // keep the code in local variable in order to avoid invalid read in case of async query
   int32_t code = pSql->res.code;
   if (code == TSDB_CODE_SUCCESS) {
-    (*pSql->fp)(pSql->param, pSql, 0);
+    (*pSql->fp)(pSql->param, pSql, code);
   } else {
     tscQueueAsyncRes(pSql);
   }
diff --git a/src/client/src/tscSQLParser.c b/src/client/src/tscSQLParser.c
index ba012f414e4fb5916b5f04292e2ff861533cd610..32ec0a0db12522abf2f78fe371f8ac2d452c6950 100644
--- a/src/client/src/tscSQLParser.c
+++ b/src/client/src/tscSQLParser.c
@@ -5395,20 +5395,15 @@ int32_t doLocalQueryProcess(SQueryInfo* pQueryInfo, SQuerySQL* pQuerySql) {
 
   switch (index) {
     case 0:
-      pQueryInfo->command = TSDB_SQL_CURRENT_DB;
-      return TSDB_CODE_SUCCESS;
+      pQueryInfo->command = TSDB_SQL_CURRENT_DB;break;
     case 1:
-      pQueryInfo->command = TSDB_SQL_SERV_VERSION;
-      return TSDB_CODE_SUCCESS;
-    case 2:
-      pQueryInfo->command = TSDB_SQL_SERV_STATUS;
-      return TSDB_CODE_SUCCESS;
+      pQueryInfo->command = TSDB_SQL_SERV_VERSION;break;
+      case 2:
+      pQueryInfo->command = TSDB_SQL_SERV_STATUS;break;
     case 3:
-      pQueryInfo->command = TSDB_SQL_CLI_VERSION;
-      return TSDB_CODE_SUCCESS;
+      pQueryInfo->command = TSDB_SQL_CLI_VERSION;break;
     case 4:
-      pQueryInfo->command = TSDB_SQL_CURRENT_USER;
-      return TSDB_CODE_SUCCESS;
+      pQueryInfo->command = TSDB_SQL_CURRENT_USER;break;
     default: { return invalidSqlErrMsg(pQueryInfo->msg, msg3); }
   }
   
@@ -5418,6 +5413,8 @@ int32_t doLocalQueryProcess(SQueryInfo* pQueryInfo, SQuerySQL* pQuerySql) {
   
   const char* name = (pExprList->a[0].aliasName != NULL)? pExprList->a[0].aliasName:functionsInfo[index].name;
   strncpy(pExpr1->aliasName, name, tListLen(pExpr1->aliasName));
+  
+  return TSDB_CODE_SUCCESS;
 }
 
 // can only perform the parameters based on the macro definitation
diff --git a/src/client/src/tscSchemaUtil.c b/src/client/src/tscSchemaUtil.c
index ce36a73bfc0b681df3872e3b84309e05e9515b47..59415f842e8763373aa3d089130eca1d320f80c5 100644
--- a/src/client/src/tscSchemaUtil.c
+++ b/src/client/src/tscSchemaUtil.c
@@ -131,13 +131,6 @@ SSchema* tscGetTableColumnSchema(const STableMeta* pTableMeta, int32_t startCol)
   assert(pTableMeta != NULL);
   
   SSchema* pSchema = (SSchema*) pTableMeta->schema;
-#if 0
-  if (pTableMeta->tableType == TSDB_CHILD_TABLE) {
-    assert (pTableMeta->pSTable != NULL);
-    pSchema = pTableMeta->pSTable->schema;
-  }
-#endif
-
   return &pSchema[startCol];
 }
 
diff --git a/src/client/src/tscServer.c b/src/client/src/tscServer.c
index d8621f526b65a32835f8e0345e955eac1cb9eb41..d2e6e0ac3fa229449bf9ed3fe564367c5f0d75c9 100644
--- a/src/client/src/tscServer.c
+++ b/src/client/src/tscServer.c
@@ -1391,22 +1391,9 @@ int tscProcessDescribeTableRsp(SSqlObj *pSql) {
   return tscLocalResultCommonBuilder(pSql, numOfRes);
 }
 
-int tscProcessTagRetrieveRsp(SSqlObj *pSql) {
-//  SSqlCmd *pCmd = &pSql->cmd;
-
-//  SQueryInfo *    pQueryInfo = tscGetQueryInfoDetail(pCmd, pCmd->clauseIndex);
-//  STableMetaInfo *pTableMetaInfo = tscGetMetaInfo(pQueryInfo, 0);
-
-  int32_t numOfRes = 0;
-#if 0
-  if (tscSqlExprGet(pQueryInfo, 0)->functionId == TSDB_FUNC_TAGPRJ) {
-    numOfRes = pTableMetaInfo->pMetricMeta->numOfTables;
-  } else {
-    numOfRes = 1;  // for count function, there is only one output.
-  }
-  
-#endif
-
+int tscProcessLocalRetrieveRsp(SSqlObj *pSql) {
+  int32_t numOfRes = 1;
+  pSql->res.completed = true;
   return tscLocalResultCommonBuilder(pSql, numOfRes);
 }
 
@@ -2562,11 +2549,11 @@ void tscInitMsgsFp() {
   tscProcessMsgRsp[TSDB_SQL_RETRIEVE] = tscProcessRetrieveRspFromNode;  // rsp handled by same function.
   tscProcessMsgRsp[TSDB_SQL_DESCRIBE_TABLE] = tscProcessDescribeTableRsp;
 
-  tscProcessMsgRsp[TSDB_SQL_CURRENT_DB] = tscProcessTagRetrieveRsp;
-  tscProcessMsgRsp[TSDB_SQL_CURRENT_USER] = tscProcessTagRetrieveRsp;
-  tscProcessMsgRsp[TSDB_SQL_SERV_VERSION] = tscProcessTagRetrieveRsp;
-  tscProcessMsgRsp[TSDB_SQL_CLI_VERSION] = tscProcessTagRetrieveRsp;
-  tscProcessMsgRsp[TSDB_SQL_SERV_STATUS] = tscProcessTagRetrieveRsp;
+  tscProcessMsgRsp[TSDB_SQL_CURRENT_DB]   = tscProcessLocalRetrieveRsp;
+  tscProcessMsgRsp[TSDB_SQL_CURRENT_USER] = tscProcessLocalRetrieveRsp;
+  tscProcessMsgRsp[TSDB_SQL_SERV_VERSION] = tscProcessLocalRetrieveRsp;
+  tscProcessMsgRsp[TSDB_SQL_CLI_VERSION]  = tscProcessLocalRetrieveRsp;
+  tscProcessMsgRsp[TSDB_SQL_SERV_STATUS]  = tscProcessLocalRetrieveRsp;
 
   tscProcessMsgRsp[TSDB_SQL_RETRIEVE_EMPTY_RESULT] = tscProcessEmptyResultRsp;
 
diff --git a/src/client/src/tscSql.c b/src/client/src/tscSql.c
index 3f6910f0079a15b3596e07347d9d2fb2127364fa..156e727d7e7fe714cae8a46140b80da0ca6ea7e2 100644
--- a/src/client/src/tscSql.c
+++ b/src/client/src/tscSql.c
@@ -413,10 +413,6 @@ int taos_fetch_block_impl(TAOS_RES *res, TAOS_ROW *rows) {
 
 static void waitForRetrieveRsp(void *param, TAOS_RES *tres, int numOfRows) {
   SSqlObj* pSql = (SSqlObj*) tres;
-  
-  if (numOfRows < 0) { // set the error code
-    pSql->res.code = -numOfRows;
-  }
   sem_post(&pSql->rspSem);
 }
 
@@ -444,7 +440,12 @@ TAOS_ROW taos_fetch_row(TAOS_RES *res) {
        pCmd->command == TSDB_SQL_FETCH ||
        pCmd->command == TSDB_SQL_SHOW ||
        pCmd->command == TSDB_SQL_SELECT ||
-       pCmd->command == TSDB_SQL_DESCRIBE_TABLE)) {
+       pCmd->command == TSDB_SQL_DESCRIBE_TABLE ||
+       pCmd->command == TSDB_SQL_SERV_STATUS ||
+       pCmd->command == TSDB_SQL_CURRENT_DB ||
+       pCmd->command == TSDB_SQL_SERV_VERSION ||
+       pCmd->command == TSDB_SQL_CLI_VERSION ||
+       pCmd->command == TSDB_SQL_CURRENT_USER )) {
     taos_fetch_rows_a(res, waitForRetrieveRsp, pSql->pTscObj);
     sem_wait(&pSql->rspSem);
   }
diff --git a/src/client/src/tscUtil.c b/src/client/src/tscUtil.c
index 1b9fec7211540062f56dc29b1fcf1fdf795b89f4..811d0920f9ed280317c28aaa63e132a6dd377e34 100644
--- a/src/client/src/tscUtil.c
+++ b/src/client/src/tscUtil.c
@@ -965,7 +965,8 @@ static SSqlExpr* doBuildSqlExpr(SQueryInfo* pQueryInfo, int16_t functionId, SCol
       SSchema* pSchema = tscGetTableTagSchema(pTableMetaInfo->pTableMeta);
       pExpr->colInfo.colId = pSchema[pColIndex->columnIndex].colId;
       strncpy(pExpr->colInfo.name, pSchema[pColIndex->columnIndex].name, TSDB_COL_NAME_LEN);
-    } else {
+    } else if (pTableMetaInfo->pTableMeta != NULL) {
+      // in handling select database/version/server_status(), the pTableMeta is NULL
       SSchema* pSchema = tscGetTableColumnSchema(pTableMetaInfo->pTableMeta, pColIndex->columnIndex);
       pExpr->colInfo.colId = pSchema->colId;
       strncpy(pExpr->colInfo.name, pSchema->name, TSDB_COL_NAME_LEN);
@@ -977,8 +978,12 @@ static SSqlExpr* doBuildSqlExpr(SQueryInfo* pQueryInfo, int16_t functionId, SCol
   pExpr->colInfo.colIndex = pColIndex->columnIndex;
   pExpr->resType       = type;
   pExpr->resBytes      = size;
-  pExpr->interBytes = interSize;
-  pExpr->uid           = pTableMetaInfo->pTableMeta->uid;
+  pExpr->interBytes    = interSize;
+  
+  if (pTableMetaInfo->pTableMeta) {
+    pExpr->uid = pTableMetaInfo->pTableMeta->uid;
+  }
+  
   
   return pExpr;
 }