qnode for policy 2/3

include/libs/catalog/catalog.h

@@ -87,7 +87,7 @@ typedef struct SMetaData {
   SArray* pUdfList;     // pRes = SFuncInfo*
   SArray* pIndex;       // pRes = SIndexInfo*
   SArray* pUser;        // pRes = bool*
-  SArray* pQnodeList;   // pRes = SQueryNodeAddr*
+  SArray* pQnodeList;   // pRes = SArray<SQueryNodeLoad>*
 } SMetaData;
 
 typedef struct SCatalogCfg {

include/libs/qcom/query.h

@@ -47,6 +47,10 @@ typedef enum {
   TARGET_TYPE_OTHER,
 } ETargetType;
 
+#define QUERY_POLICY_VNODE  1
+#define QUERY_POLICY_HYBRID 2
+#define QUERY_POLICY_QNODE  3
+
 typedef struct STableComInfo {
   uint8_t  numOfTags;     // the number of tags in schema
   uint8_t  precision;     // the number of precision

include/util/taoserror.h

@@ -128,6 +128,7 @@ int32_t* taosGetErrno();
 #define TSDB_CODE_TSC_STMT_TBNAME_ERROR         TAOS_DEF_ERROR_CODE(0, 0X0226)
 #define TSDB_CODE_TSC_STMT_CLAUSE_ERROR         TAOS_DEF_ERROR_CODE(0, 0X0227)
 #define TSDB_CODE_TSC_QUERY_KILLED              TAOS_DEF_ERROR_CODE(0, 0X0228)
+#define TSDB_CODE_TSC_NO_EXEC_NODE              TAOS_DEF_ERROR_CODE(0, 0X0229)
 
 // mnode-common
 #define TSDB_CODE_MND_APP_ERROR                 TAOS_DEF_ERROR_CODE(0, 0x0300)

source/client/inc/clientInt.h

@@ -22,6 +22,7 @@ extern "C" {
 
 #include "parser.h"
 #include "planner.h"
+#include "catalog.h"
 #include "query.h"
 #include "taos.h"
 #include "tcommon.h"
@@ -292,7 +293,7 @@ SRequestObj* launchQuery(STscObj* pTscObj, const char* sql, int sqlLen);
 
 int32_t parseSql(SRequestObj* pRequest, bool topicQuery, SQuery** pQuery, SStmtCallback* pStmtCb);
 
-int32_t getPlan(SRequestObj* pRequest, SQuery* pQuery, SQueryPlan** pPlan, SArray** pNodeList);
+int32_t getPlan(SRequestObj* pRequest, SQuery* pQuery, SQueryPlan** pPlan, SArray* pNodeList);
 
 int32_t buildRequest(STscObj* pTscObj, const char* sql, int sqlLen, SRequestObj** pRequest);
 
@@ -317,12 +318,13 @@ void hbMgrInitMqHbRspHandle();
 
 SRequestObj* launchQueryImpl(SRequestObj* pRequest, SQuery* pQuery, bool keepQuery, void** res);
 int32_t      scheduleQuery(SRequestObj* pRequest, SQueryPlan* pDag, SArray* pNodeList);
-void         launchAsyncQuery(SRequestObj* pRequest, SQuery* pQuery);
+void         launchAsyncQuery(SRequestObj* pRequest, SQuery* pQuery, SMetaData *pResultMeta);
 int32_t      refreshMeta(STscObj* pTscObj, SRequestObj* pRequest);
 int32_t      updateQnodeList(SAppInstInfo* pInfo, SArray* pNodeList);
 void         doAsyncQuery(SRequestObj* pRequest, bool forceUpdateMeta);
 int32_t      removeMeta(STscObj* pTscObj, SArray* tbList);// todo move to clientImpl.c and become a static function
 int32_t      handleAlterTbExecRes(void* res, struct SCatalog* pCatalog);// todo move to xxx
+bool         qnodeRequired(SRequestObj* pRequest);
 
 #ifdef __cplusplus
 }

source/client/src/clientImpl.c

@@ -307,6 +307,21 @@ int32_t updateQnodeList(SAppInstInfo* pInfo, SArray* pNodeList) {
   return TSDB_CODE_SUCCESS;
 }
 
+bool qnodeRequired(SRequestObj* pRequest) {
+  if (QUERY_POLICY_VNODE == tsQueryPolicy) {
+    return false;
+  }
+
+  SAppInstInfo* pInfo = pRequest->pTscObj->pAppInfo;
+  bool required = false;
+  
+  taosThreadMutexLock(&pInfo->qnodeMutex);
+  required = (NULL == pInfo->pQnodeList);
+  taosThreadMutexUnlock(&pInfo->qnodeMutex);
+
+  return required;
+}
+
 int32_t getQnodeList(SRequestObj* pRequest, SArray** pNodeList) {
   SAppInstInfo* pInfo = pRequest->pTscObj->pAppInfo;
   int32_t       code = 0;
@@ -337,7 +352,7 @@ int32_t getQnodeList(SRequestObj* pRequest, SArray** pNodeList) {
   return code;
 }
 
-int32_t getPlan(SRequestObj* pRequest, SQuery* pQuery, SQueryPlan** pPlan, SArray** pNodeList) {
+int32_t getPlan(SRequestObj* pRequest, SQuery* pQuery, SQueryPlan** pPlan, SArray* pNodeList) {
   pRequest->type = pQuery->msgType;
   SAppInstInfo* pAppInfo = getAppInfo(pRequest);
 
@@ -349,12 +364,7 @@ int32_t getPlan(SRequestObj* pRequest, SQuery* pQuery, SQueryPlan** pPlan, SArra
                       .pMsg = pRequest->msgBuf,
                       .msgLen = ERROR_MSG_BUF_DEFAULT_SIZE};
 
-  int32_t code = getQnodeList(pRequest, pNodeList);
-  if (TSDB_CODE_SUCCESS == code) {
-    code = qCreateQueryPlan(&cxt, pPlan, *pNodeList);
-  }
-
-  return code;
+  return qCreateQueryPlan(&cxt, pPlan, pNodeList);
 }
 
 void setResSchemaInfo(SReqResultInfo* pResInfo, const SSchema* pSchema, int32_t numOfCols) {
@@ -397,6 +407,195 @@ void setResPrecision(SReqResultInfo* pResInfo, int32_t precision) {
   pResInfo->precision = precision;
 }
 
+int32_t buildVnodePolicyNodeList(SRequestObj* pRequest, SArray** pNodeList, SArray* pMnodeList, SArray* pDbVgList) {
+  SArray* nodeList = taosArrayInit(4, sizeof(SQueryNodeLoad));
+
+  int32_t dbNum = taosArrayGetSize(pDbVgList);
+  for (int32_t i = 0; i < dbNum; ++i) {
+    SArray* pVg = taosArrayGetP(pDbVgList, i);
+    int32_t vgNum = taosArrayGetSize(pVg);
+    if (vgNum <= 0) {
+      continue;
+    }
+
+    for (int32_t j = 0; j < vgNum; ++j) {
+      SVgroupInfo* pInfo = taosArrayGet(pVg, j);
+      SQueryNodeLoad load = {0};
+      load.addr.nodeId = pInfo->vgId;
+      load.addr.epSet = pInfo->epSet;
+      
+      taosArrayPush(nodeList, &load);
+    }
+  }
+
+  int32_t vnodeNum = taosArrayGetSize(nodeList);
+  if (vnodeNum > 0) {
+    tscDebug("0x%" PRIx64 " vnode policy, use vnode list, num:%d", pRequest->requestId, vnodeNum);
+    goto _return;
+  }
+
+  int32_t mnodeNum = taosArrayGetSize(pMnodeList);
+  if (mnodeNum <= 0) {
+    tscDebug("0x%" PRIx64 " vnode policy, empty node list", pRequest->requestId);
+    goto _return;
+  }
+
+  void* pData = taosArrayGet(pMnodeList, 0);
+  taosArrayAddBatch(nodeList, pData, mnodeNum);
+
+  tscDebug("0x%" PRIx64 " vnode policy, use mnode list, num:%d", pRequest->requestId, mnodeNum);
+
+_return:
+
+  *pNodeList = nodeList;
+
+  return TSDB_CODE_SUCCESS;
+}
+
+int32_t buildQnodePolicyNodeList(SRequestObj* pRequest, SArray** pNodeList, SArray* pMnodeList, SArray* pQnodeList) {
+  SArray* nodeList = taosArrayInit(4, sizeof(SQueryNodeLoad));
+
+  int32_t qNodeNum = taosArrayGetSize(pQnodeList);
+  if (qNodeNum > 0) {
+    void* pData = taosArrayGet(pQnodeList, 0);
+    taosArrayAddBatch(nodeList, pData, qNodeNum);
+    tscDebug("0x%" PRIx64 " qnode policy, use qnode list, num:%d", pRequest->requestId, qNodeNum);
+    goto _return;
+  }
+
+  int32_t mnodeNum = taosArrayGetSize(pMnodeList);
+  if (mnodeNum <= 0) {
+    tscDebug("0x%" PRIx64 " qnode policy, empty node list", pRequest->requestId);
+    goto _return;
+  }
+
+  void* pData = taosArrayGet(pMnodeList, 0);
+  taosArrayAddBatch(nodeList, pData, mnodeNum);
+
+  tscDebug("0x%" PRIx64 " qnode policy, use mnode list, num:%d", pRequest->requestId, mnodeNum);
+
+_return:
+
+  *pNodeList = nodeList;
+
+  return TSDB_CODE_SUCCESS;
+}
+
+
+int32_t buildAsyncExecNodeList(SRequestObj* pRequest, SArray** pNodeList, SArray* pMnodeList, SMetaData *pResultMeta) {
+  SArray* pDbVgList = NULL;
+  SArray* pQnodeList = NULL;
+  int32_t code = 0;
+  
+  switch (tsQueryPolicy) {
+    case QUERY_POLICY_VNODE: {
+      if (pResultMeta) {
+        pDbVgList = taosArrayInit(4, POINTER_BYTES);
+        
+        int32_t dbNum = taosArrayGetSize(pResultMeta->pDbVgroup);
+        for (int32_t i = 0; i < dbNum; ++i) {
+          SMetaRes* pRes = taosArrayGet(pResultMeta->pDbVgroup, i);
+          if (pRes->code || NULL == pRes->pRes) {
+            continue;
+          }
+
+          taosArrayPush(pDbVgList, &pRes->pRes);
+        } 
+      }
+    
+      code = buildVnodePolicyNodeList(pRequest, pNodeList, pMnodeList, pDbVgList);
+      break;
+    }
+    case QUERY_POLICY_HYBRID:
+    case QUERY_POLICY_QNODE: {
+      if (pResultMeta && taosArrayGetSize(pResultMeta->pQnodeList) > 0) {
+        SMetaRes* pRes = taosArrayGet(pResultMeta->pQnodeList, 0);
+        if (pRes->code) {
+          pQnodeList = NULL;
+        } else {
+          pQnodeList = taosArrayDup((SArray*)pRes->pRes);
+        }
+      } else {
+        SAppInstInfo* pInst = pRequest->pTscObj->pAppInfo;
+        taosThreadMutexLock(&pInst->qnodeMutex);
+        if (pInst->pQnodeList) {
+          pQnodeList = taosArrayDup(pInst->pQnodeList);
+        }
+        taosThreadMutexUnlock(&pInst->qnodeMutex);
+      }
+      
+      code = buildQnodePolicyNodeList(pRequest, pNodeList, pMnodeList, pQnodeList);
+      break;
+    }
+    default:
+      tscError("unknown query policy: %d", tsQueryPolicy);
+      return TSDB_CODE_TSC_APP_ERROR;
+  }
+
+  taosArrayDestroy(pDbVgList);
+  taosArrayDestroy(pQnodeList);
+  
+  return code;
+}
+
+int32_t buildSyncExecNodeList(SRequestObj* pRequest, SArray** pNodeList, SArray* pMnodeList) {
+  SArray* pDbVgList = NULL;
+  SArray* pQnodeList = NULL;
+  int32_t code = 0;
+  
+  switch (tsQueryPolicy) {
+    case QUERY_POLICY_VNODE: {
+      int32_t dbNum = taosArrayGetSize(pRequest->dbList);
+      if (dbNum > 0) {
+        SCatalog* pCtg = NULL;
+        SAppInstInfo* pInst = pRequest->pTscObj->pAppInfo;
+        code = catalogGetHandle(pInst->clusterId, &pCtg);
+        if (code != TSDB_CODE_SUCCESS) {
+          goto _return;
+        }
+
+        pDbVgList = taosArrayInit(dbNum, POINTER_BYTES);   
+        SArray* pVgList = NULL;
+        for (int32_t i = 0; i < dbNum; ++i) {
+          char* dbFName = taosArrayGet(pRequest->dbList, i);
+          SRequestConnInfo conn = {.pTrans = pInst->pTransporter,
+                                   .requestId = pRequest->requestId,
+                                   .requestObjRefId = pRequest->self,
+                                   .mgmtEps = getEpSet_s(&pInst->mgmtEp)};    
+                                   
+          code = catalogGetDBVgInfo(pCtg, &conn, dbFName, &pVgList);
+          if (code) {
+            goto _return;
+          }
+        
+          taosArrayPush(pDbVgList, &pVgList);
+        } 
+      }
+    
+      code = buildVnodePolicyNodeList(pRequest, pNodeList, pMnodeList, pDbVgList);
+      break;
+    }
+    case QUERY_POLICY_HYBRID:
+    case QUERY_POLICY_QNODE: {
+      getQnodeList(pRequest, &pQnodeList);
+      
+      code = buildQnodePolicyNodeList(pRequest, pNodeList, pMnodeList, pQnodeList);
+      break;
+    }
+    default:
+      tscError("unknown query policy: %d", tsQueryPolicy);
+      return TSDB_CODE_TSC_APP_ERROR;
+  }
+
+_return:
+
+  taosArrayDestroy(pDbVgList);
+  taosArrayDestroy(pQnodeList);
+  
+  return code;
+}
+
+
 int32_t scheduleAsyncQuery(SRequestObj* pRequest, SQueryPlan* pDag, SArray* pNodeList) {
   tsem_init(&schdRspSem, 0, 0);
 
@@ -658,12 +857,16 @@ SRequestObj* launchQueryImpl(SRequestObj* pRequest, SQuery* pQuery, bool keepQue
       code = execDdlQuery(pRequest, pQuery);
       break;
     case QUERY_EXEC_MODE_SCHEDULE: {
-      SArray* pNodeList = NULL;
-      code = getPlan(pRequest, pQuery, &pRequest->body.pDag, &pNodeList);
+      SArray* pMnodeList = taosArrayInit(4, sizeof(SQueryNodeLoad));
+      code = getPlan(pRequest, pQuery, &pRequest->body.pDag, pMnodeList);
       if (TSDB_CODE_SUCCESS == code) {
+        SArray* pNodeList = NULL;
+        buildSyncExecNodeList(pRequest, &pNodeList, pMnodeList);
+        
         code = scheduleQuery(pRequest, pRequest->body.pDag, pNodeList);
+        taosArrayDestroy(pNodeList);
       }
-      taosArrayDestroy(pNodeList);
+      taosArrayDestroy(pMnodeList);
       break;
     }
     case QUERY_EXEC_MODE_EMPTY_RESULT:
@@ -712,7 +915,7 @@ SRequestObj* launchQuery(STscObj* pTscObj, const char* sql, int sqlLen) {
   return launchQueryImpl(pRequest, pQuery, false, NULL);
 }
 
-void launchAsyncQuery(SRequestObj* pRequest, SQuery* pQuery) {
+void launchAsyncQuery(SRequestObj* pRequest, SQuery* pQuery, SMetaData *pResultMeta) {
   int32_t code = 0;
 
   switch (pQuery->execMode) {
@@ -723,7 +926,7 @@ void launchAsyncQuery(SRequestObj* pRequest, SQuery* pQuery) {
       code = asyncExecDdlQuery(pRequest, pQuery);
       break;
     case QUERY_EXEC_MODE_SCHEDULE: {
-      SArray* pNodeList = taosArrayInit(4, sizeof(SQueryNodeLoad));
+      SArray* pMnodeList = taosArrayInit(4, sizeof(SQueryNodeLoad));
 
       pRequest->type = pQuery->msgType;
 
@@ -736,13 +939,16 @@ void launchAsyncQuery(SRequestObj* pRequest, SQuery* pQuery) {
                           .msgLen = ERROR_MSG_BUF_DEFAULT_SIZE};
 
       SAppInstInfo* pAppInfo = getAppInfo(pRequest);
-      code = qCreateQueryPlan(&cxt, &pRequest->body.pDag, pNodeList);
+      code = qCreateQueryPlan(&cxt, &pRequest->body.pDag, pMnodeList);
       if (code) {
         tscError("0x%" PRIx64 " failed to create query plan, code:%s 0x%" PRIx64, pRequest->self, tstrerror(code),
                  pRequest->requestId);
       }
 
       if (TSDB_CODE_SUCCESS == code) {
+        SArray* pNodeList = NULL;
+        buildAsyncExecNodeList(pRequest, &pNodeList, pMnodeList, pResultMeta);
+        
         SRequestConnInfo conn = {
             .pTrans = pAppInfo->pTransporter, .requestId = pRequest->requestId, .requestObjRefId = pRequest->self};
         SSchedulerReq req = {.pConn = &conn,
@@ -754,6 +960,7 @@ void launchAsyncQuery(SRequestObj* pRequest, SQuery* pQuery) {
                              .cbParam = pRequest,
                              .reqKilled = &pRequest->killed};
         code = schedulerAsyncExecJob(&req, &pRequest->body.queryJob);
+        taosArrayDestroy(pNodeList);
       } else {
         tscError("0x%" PRIx64 " failed to create query plan, code:%s 0x%" PRIx64, pRequest->self, tstrerror(code),
                  pRequest->requestId);
@@ -761,7 +968,7 @@ void launchAsyncQuery(SRequestObj* pRequest, SQuery* pQuery) {
       }
 
       // todo not to be released here
-      taosArrayDestroy(pNodeList);
+      taosArrayDestroy(pMnodeList);
       break;
     }
     case QUERY_EXEC_MODE_EMPTY_RESULT:

source/client/src/clientMain.c

@@ -702,7 +702,7 @@ void retrieveMetaCallback(SMetaData *pResultMeta, void *param, int32_t code) {
     TSWAP(pRequest->tableList, (pQuery)->pTableList);
 
     destorySqlParseWrapper(pWrapper);
-    launchAsyncQuery(pRequest, pQuery);
+    launchAsyncQuery(pRequest, pQuery, pResultMeta);
   } else {
     destorySqlParseWrapper(pWrapper);
     tscDebug("error happens, code:%d", code);
@@ -808,7 +808,7 @@ void doAsyncQuery(SRequestObj *pRequest, bool updateMetaForce) {
 
   SQuery *pQuery = NULL;
 
-  SCatalogReq catalogReq = {.forceUpdate = updateMetaForce};
+  SCatalogReq catalogReq = {.forceUpdate = updateMetaForce, .qNodeRequired = qnodeRequired(pRequest)};
   code = qParseSqlSyntax(pCxt, &pQuery, &catalogReq);
   if (code != TSDB_CODE_SUCCESS) {
     goto _error;

source/client/src/clientSml.c

@@ -2274,7 +2274,7 @@ static int32_t smlInsertData(SSmlHandle *info) {
   //  info->affectedRows = taos_affected_rows(info->pRequest);
   //  return info->pRequest->code;
 
-  launchAsyncQuery(info->pRequest, info->pQuery);
+  launchAsyncQuery(info->pRequest, info->pQuery, NULL);
   return TSDB_CODE_SUCCESS;
 }
 

source/libs/planner/inc/planInt.h

@@ -23,10 +23,6 @@ extern "C" {
 #include "planner.h"
 #include "taoserror.h"
 
-#define QUERY_POLICY_VNODE  1
-#define QUERY_POLICY_HYBRID 2
-#define QUERY_POLICY_QNODE  3
-
 #define planFatal(param, ...)  qFatal("PLAN: " param, __VA_ARGS__)
 #define planError(param, ...)  qError("PLAN: " param, __VA_ARGS__)
 #define planWarn(param, ...)   qWarn("PLAN: " param, __VA_ARGS__)

source/libs/planner/src/planPhysiCreater.c

@@ -458,8 +458,6 @@ static int32_t createTagScanPhysiNode(SPhysiPlanContext* pCxt, SSubplan* pSubpla
     return TSDB_CODE_OUT_OF_MEMORY;
   }
   vgroupInfoToNodeAddr(pScanLogicNode->pVgroupList->vgroups, &pSubplan->execNode);
-  SQueryNodeLoad node = {.addr = pSubplan->execNode, .load = 0};
-  taosArrayPush(pCxt->pExecNodeList, &node);
   return createScanPhysiNodeFinalize(pCxt, pSubplan, pScanLogicNode, (SScanPhysiNode*)pTagScan, pPhyNode);
 }
 
@@ -493,10 +491,6 @@ static int32_t createTableScanPhysiNode(SPhysiPlanContext* pCxt, SSubplan* pSubp
     vgroupInfoToNodeAddr(pScanLogicNode->pVgroupList->vgroups, &pSubplan->execNode);
     pSubplan->execNodeStat.tableNum = pScanLogicNode->pVgroupList->vgroups[0].numOfTable;
   }
-  if (pCxt->pExecNodeList) {
-    SQueryNodeLoad node = {.addr = pSubplan->execNode, .load = 0};
-    taosArrayPush(pCxt->pExecNodeList, &node);
-  }
   tNameGetFullDbName(&pScanLogicNode->tableName, pSubplan->dbFName);
   pTableScan->dataRequired = pScanLogicNode->dataRequired;
   pTableScan->pDynamicScanFuncs = nodesCloneList(pScanLogicNode->pDynamicScanFuncs);
@@ -531,12 +525,9 @@ static int32_t createSystemTableScanPhysiNode(SPhysiPlanContext* pCxt, SSubplan*
   pScan->accountId = pCxt->pPlanCxt->acctId;
   if (0 == strcmp(pScanLogicNode->tableName.tname, TSDB_INS_TABLE_USER_TABLES)) {
     vgroupInfoToNodeAddr(pScanLogicNode->pVgroupList->vgroups, &pSubplan->execNode);
-    SQueryNodeLoad node = {.addr = pSubplan->execNode, .load = 0};
-    taosArrayPush(pCxt->pExecNodeList, &node);
-  } else {
-    SQueryNodeLoad node = {.addr = {.nodeId = MNODE_HANDLE, .epSet = pCxt->pPlanCxt->mgmtEpSet}, .load = 0};
-    taosArrayPush(pCxt->pExecNodeList, &node);
   }
+  SQueryNodeLoad node = {.addr = {.nodeId = MNODE_HANDLE, .epSet = pCxt->pPlanCxt->mgmtEpSet}, .load = 0};
+  taosArrayPush(pCxt->pExecNodeList, &node);
   pScan->mgmtEpSet = pCxt->pPlanCxt->mgmtEpSet;
   tNameGetFullDbName(&pScanLogicNode->tableName, pSubplan->dbFName);
 
@@ -1373,8 +1364,6 @@ static SSubplan* makeSubplan(SPhysiPlanContext* pCxt, SLogicSubplan* pLogicSubpl
 static int32_t buildInsertSubplan(SPhysiPlanContext* pCxt, SVnodeModifyLogicNode* pModify, SSubplan* pSubplan) {
   pSubplan->msgType = pModify->msgType;
   pSubplan->execNode.epSet = pModify->pVgDataBlocks->vg.epSet;
-  SQueryNodeLoad node = {.addr = pSubplan->execNode, .load = 0};
-  taosArrayPush(pCxt->pExecNodeList, &node);
   return createDataInserter(pCxt, pModify->pVgDataBlocks, &pSubplan->pDataSink);
 }
 

source/libs/scheduler/src/schJob.c

@@ -652,7 +652,7 @@ int32_t schSetAddrsFromNodeList(SSchJob *pJob, SSchTask *pTask) {
 
   if (addNum <= 0) {
     SCH_TASK_ELOG("no available execNode as candidates, nodeNum:%d", nodeNum);
-    SCH_ERR_RET(TSDB_CODE_QRY_INVALID_INPUT);
+    SCH_ERR_RET(TSDB_CODE_TSC_NO_EXEC_NODE);
   }
 
   return TSDB_CODE_SUCCESS;
@@ -677,7 +677,7 @@ int32_t schSetTaskCandidateAddrs(SSchJob *pJob, SSchTask *pTask) {
       SCH_ERR_RET(TSDB_CODE_QRY_OUT_OF_MEMORY);
     }
 
-    SCH_TASK_DLOG("use execNode from plan as candidate addr, numOfEps:%d", pTask->plan->execNode.epSet.numOfEps);
+    SCH_TASK_DLOG("use execNode in plan as candidate addr, numOfEps:%d", pTask->plan->execNode.epSet.numOfEps);
 
     return TSDB_CODE_SUCCESS;
   }

source/util/src/terror.c

@@ -133,6 +133,7 @@ TAOS_DEFINE_ERROR(TSDB_CODE_TSC_STMT_API_ERROR,           "Stmt API usage error"
 TAOS_DEFINE_ERROR(TSDB_CODE_TSC_STMT_TBNAME_ERROR,        "Stmt table name not set")
 TAOS_DEFINE_ERROR(TSDB_CODE_TSC_STMT_CLAUSE_ERROR,        "not supported stmt clause")
 TAOS_DEFINE_ERROR(TSDB_CODE_TSC_QUERY_KILLED,             "Query killed")
+TAOS_DEFINE_ERROR(TSDB_CODE_TSC_NO_EXEC_NODE,             "No available execution node")
 
 // mnode-common
 TAOS_DEFINE_ERROR(TSDB_CODE_MND_APP_ERROR,                "Mnode internal error")