Merge pull request #6926 from taosdata/hotfix/TD-5338-m

[TD-5338]support dummy tag in sub-table interval query

src/query/src/qExecutor.c

@@ -4885,6 +4885,8 @@ static SSDataBlock* doIntervalAgg(void* param) {
       break;
     }
 
+    setTagValue(pOperator, pRuntimeEnv->pQuery->current->pTable, pIntervalInfo->pCtx, pOperator->numOfOutput);
+
     // the pDataBlock are always the same one, no need to call this again
     setInputDataBlock(pOperator, pIntervalInfo->pCtx, pBlock, pQuery->order.order);
     hashIntervalAgg(pOperator, &pIntervalInfo->resultRowInfo, pBlock, 0);