diff --git a/source/libs/executor/inc/executorimpl.h b/source/libs/executor/inc/executorimpl.h
index 9b9a1ef259936881ec80e5a0a406053eed9ce34c..f179c7bd41e732d6b97a10b98109b71a8004b71d 100644
--- a/source/libs/executor/inc/executorimpl.h
+++ b/source/libs/executor/inc/executorimpl.h
@@ -239,6 +239,7 @@ typedef struct SSourceDataInfo {
   int32_t            index;
   SRetrieveTableRsp* pRsp;
   uint64_t           totalRows;
+  int64_t            startTime;
   int32_t            code;
   EX_SOURCE_STATUS   status;
   const char*        taskId;
diff --git a/source/libs/executor/src/exchangeoperator.c b/source/libs/executor/src/exchangeoperator.c
index c57a1b38eba63f08c3c44b4a2c87ff10f061e414..a28066003a2a60ca9f62326ff055f5193e366695 100644
--- a/source/libs/executor/src/exchangeoperator.c
+++ b/source/libs/executor/src/exchangeoperator.c
@@ -44,7 +44,7 @@ typedef struct SFetchRspHandleWrapper {
 static void destroyExchangeOperatorInfo(void* param);
 static void freeBlock(void* pParam);
 static void freeSourceDataInfo(void* param);
-static void* setAllSourcesCompleted(SOperatorInfo* pOperator, int64_t startTs);
+static void* setAllSourcesCompleted(SOperatorInfo* pOperator);
 
 static int32_t loadRemoteDataCallback(void* param, SDataBuf* pMsg, int32_t code);
 static int32_t doSendFetchDataRequest(SExchangeInfo* pExchangeInfo, SExecTaskInfo* pTaskInfo, int32_t sourceIndex);
@@ -59,7 +59,7 @@ static void concurrentlyLoadRemoteDataImpl(SOperatorInfo* pOperator, SExchangeIn
   size_t  totalSources = taosArrayGetSize(pExchangeInfo->pSourceDataInfo);
   int32_t completed = getCompletedSources(pExchangeInfo->pSourceDataInfo);
   if (completed == totalSources) {
-    setAllSourcesCompleted(pOperator, pExchangeInfo->openedTs);
+    setAllSourcesCompleted(pOperator);
     return;
   }
 
@@ -113,7 +113,8 @@ static void concurrentlyLoadRemoteDataImpl(SOperatorInfo* pOperator, SExchangeIn
         taosArrayPush(pExchangeInfo->pResultBlockList, &pb);
       }
 
-      updateLoadRemoteInfo(pLoadInfo, pRetrieveRsp->numOfRows, pRetrieveRsp->compLen, pExchangeInfo->openedTs, pOperator);
+      updateLoadRemoteInfo(pLoadInfo, pRetrieveRsp->numOfRows, pRetrieveRsp->compLen, pDataInfo->startTime, pOperator);
+      pDataInfo->totalRows += pRetrieveRsp->numOfRows;
 
       if (pRsp->completed == 1) {
         pDataInfo->status = EX_SOURCE_DATA_EXHAUSTED;
@@ -388,6 +389,7 @@ int32_t doSendFetchDataRequest(SExchangeInfo* pExchangeInfo, SExecTaskInfo* pTas
 
   SDownstreamSourceNode* pSource = taosArrayGet(pExchangeInfo->pSources, sourceIndex);
   SSourceDataInfo*       pDataInfo = taosArrayGet(pExchangeInfo->pSourceDataInfo, sourceIndex);
+  pDataInfo->startTime = taosGetTimestampUs();
 
   ASSERT(pDataInfo->status == EX_SOURCE_DATA_NOT_READY);
 
@@ -493,18 +495,14 @@ int32_t extractDataBlockFromFetchRsp(SSDataBlock* pRes, char* pData, SArray* pCo
   return TSDB_CODE_SUCCESS;
 }
 
-void* setAllSourcesCompleted(SOperatorInfo* pOperator, int64_t startTs) {
+void* setAllSourcesCompleted(SOperatorInfo* pOperator) {
   SExchangeInfo* pExchangeInfo = pOperator->info;
   SExecTaskInfo* pTaskInfo = pOperator->pTaskInfo;
 
-  int64_t              el = taosGetTimestampUs() - startTs;
   SLoadRemoteDataInfo* pLoadInfo = &pExchangeInfo->loadInfo;
-
-  pLoadInfo->totalElapsed += el;
-
   size_t totalSources = taosArrayGetSize(pExchangeInfo->pSources);
-  qDebug("%s all %" PRIzu " sources are exhausted, total rows: %" PRIu64 " bytes:%" PRIu64 ", elapsed:%.2f ms",
-         GET_TASKID(pTaskInfo), totalSources, pLoadInfo->totalRows, pLoadInfo->totalSize,
+  qDebug("%s all %" PRIzu " sources are exhausted, total rows: %" PRIu64 ", %.2f Kb, elapsed:%.2f ms",
+         GET_TASKID(pTaskInfo), totalSources, pLoadInfo->totalRows, pLoadInfo->totalSize / 1024.0,
          pLoadInfo->totalElapsed / 1000.0);
 
   setOperatorCompleted(pOperator);
@@ -566,7 +564,7 @@ int32_t seqLoadRemoteData(SOperatorInfo* pOperator) {
 
   while (1) {
     if (pExchangeInfo->current >= totalSources) {
-      setAllSourcesCompleted(pOperator, startTs);
+      setAllSourcesCompleted(pOperator);
       return TSDB_CODE_SUCCESS;
     }
 
diff --git a/source/libs/executor/src/sortoperator.c b/source/libs/executor/src/sortoperator.c
index add580ce7c89d03e9ca85f01a738ed80e6663722..14e316345576b665c015288797d886d30cd44136 100644
--- a/source/libs/executor/src/sortoperator.c
+++ b/source/libs/executor/src/sortoperator.c
@@ -690,6 +690,8 @@ SSDataBlock* doMultiwayMerge(SOperatorInfo* pOperator) {
     T_LONG_JMP(pTaskInfo->env, code);
   }
 
+  qDebug("start to merge final sorted rows, %s", GET_TASKID(pTaskInfo));
+
   SSDataBlock* pBlock = getMultiwaySortedBlockData(pInfo->pSortHandle, pInfo->binfo.pRes, pInfo->matchInfo.pList, pOperator);
   if (pBlock != NULL) {
     pOperator->resultInfo.totalRows += pBlock->info.rows;
@@ -754,7 +756,7 @@ SOperatorInfo* createMultiwayMergeOperatorInfo(SOperatorInfo** downStreams, size
   SPhysiNode*  pChildNode = (SPhysiNode*)nodesListGetNode(pPhyNode->pChildren, 0);
   SSDataBlock* pInputBlock = createResDataBlock(pChildNode->pOutputDataBlockDesc);
 
-  initResultSizeInfo(&pOperator->resultInfo, 1024);
+  initResultSizeInfo(&pOperator->resultInfo, 4096);
   blockDataEnsureCapacity(pInfo->binfo.pRes, pOperator->resultInfo.capacity);
 
   pInfo->groupSort = pMergePhyNode->groupSort;