TD-12678 dsGetDataBlock allowed to call again after the query is completed to return statistics

source/libs/executor/src/dataDispatcher.c

@@ -182,6 +182,12 @@ static void getDataLength(SDataSinkHandle* pHandle, int32_t* pLen, bool* pQueryE
 
 static int32_t getDataBlock(SDataSinkHandle* pHandle, SOutputData* pOutput) {
   SDataDispatchHandle* pDispatcher = (SDataDispatchHandle*)pHandle;
+  if (NULL == pDispatcher->nextOutput.pData) {
+    assert(pDispatcher->queryEnd);
+    pOutput->useconds = pDispatcher->useconds;
+    pOutput->precision = pDispatcher->schema.precision;
+    return TSDB_CODE_SUCCESS;
+  }
   SDataCacheEntry* pEntry = (SDataCacheEntry*)(pDispatcher->nextOutput.pData);
   memcpy(pOutput->pData, pEntry->data, pEntry->dataLen);
   pOutput->numOfRows = pEntry->numOfRows;

source/libs/planner/src/planner.c

@@ -65,9 +65,9 @@ int32_t qCreateQueryDag(const struct SQueryNode* pNode, struct SQueryDag** pDag,
   }
 
   if (pLogicPlan->info.type != QNODE_MODIFY) {
-//    char* str = NULL;
-//    queryPlanToString(pLogicPlan, &str);
-//    printf("%s\n", str);
+   char* str = NULL;
+   queryPlanToString(pLogicPlan, &str);
+   printf("%s\n", str);
   }
 
   code = optimizeQueryPlan(pLogicPlan);