refactor: do some internal refactor.

source/dnode/vnode/inc/vnode.h

@@ -180,6 +180,7 @@ int32_t tsdbSetTableList(STsdbReader *pReader, const void *pTableList, int32_t n
 int32_t tsdbReaderOpen(SVnode *pVnode, SQueryTableDataCond *pCond, void *pTableList, int32_t numOfTables,
                        SSDataBlock *pResBlock, STsdbReader **ppReader, const char *idstr);
 
+void         tsdbReaderSetId(STsdbReader* pReader, const char* idstr);
 void         tsdbReaderClose(STsdbReader *pReader);
 bool         tsdbNextDataBlock(STsdbReader *pReader);
 int32_t      tsdbRetrieveDatablockSMA(STsdbReader *pReader, SSDataBlock *pDataBlock, bool *allHave);

source/dnode/vnode/src/tsdb/tsdbRead.c

@@ -4990,3 +4990,9 @@ void tsdbUntakeReadSnap(STsdbReader* pReader, STsdbReadSnap* pSnap, bool proacti
   }
   tsdbTrace("vgId:%d, untake read snapshot", TD_VID(pTsdb->pVnode));
 }
+
+// if failed, do nothing
+void tsdbReaderSetId(STsdbReader* pReader, const char* idstr) {
+  taosMemoryFreeClear(pReader->idStr);
+  pReader->idStr = taosStrdup(idstr);
+}
\ No newline at end of file

source/libs/executor/src/executor.c

@@ -159,12 +159,28 @@ static int32_t doSetStreamBlock(SOperatorInfo* pOperator, void* input, size_t nu
   }
 }
 
+void doSetTaskId(SOperatorInfo* pOperator) {
+  SExecTaskInfo* pTaskInfo = pOperator->pTaskInfo;
+  if (pOperator->operatorType == QUERY_NODE_PHYSICAL_PLAN_STREAM_SCAN) {
+    SStreamScanInfo* pStreamScanInfo = pOperator->info;
+    STableScanInfo*  pScanInfo = pStreamScanInfo->pTableScanOp->info;
+    if (pScanInfo->base.dataReader != NULL) {
+      tsdbReaderSetId(pScanInfo->base.dataReader, pTaskInfo->id.str);
+    }
+  } else {
+    doSetTaskId(pOperator->pDownstream[0]);
+  }
+}
+
 void qSetTaskId(qTaskInfo_t tinfo, uint64_t taskId, uint64_t queryId) {
   SExecTaskInfo* pTaskInfo = tinfo;
   pTaskInfo->id.queryId = queryId;
 
   taosMemoryFreeClear(pTaskInfo->id.str);
   pTaskInfo->id.str = buildTaskId(taskId, queryId);
+
+  // set the idstr for tsdbReader
+  doSetTaskId(pTaskInfo->pRoot);
 }
 
 int32_t qSetStreamOpOpen(qTaskInfo_t tinfo) {