diff --git a/include/common/tmsg.h b/include/common/tmsg.h
index a96f737cc2..6cbcd9d4be 100644
--- a/include/common/tmsg.h
+++ b/include/common/tmsg.h
@@ -2052,25 +2052,16 @@ typedef struct {
 
 
 typedef struct SOperatorParam {
-  SArray*             pOpParams; //SArray<SOperatorSpecParam>
+  int32_t             opType;
+  int32_t             downstreamIdx;
+  void*               value;
+  SArray*             pChildren; //SArray<SOperatorParam*>
 } SOperatorParam;
 
-typedef struct SOperatorSpecParam {
-  int32_t         opType;
-  void*           value;
-} SOperatorSpecParam;
-
-typedef struct SOperatorBaseParam {
-  SOperatorParam* pChild;
-} SOperatorBaseParam;
-
-
 typedef struct STableScanOperatorParam {
-  SOperatorParam*     pChild;
   SArray*             pUidList;
 } STableScanOperatorParam;
 
-
 typedef struct {
   SMsgHead        header;
   uint64_t        sId;
diff --git a/source/common/src/tmsg.c b/source/common/src/tmsg.c
index 6ef6ccbb4d..e1a06f515b 100644
--- a/source/common/src/tmsg.c
+++ b/source/common/src/tmsg.c
@@ -5500,71 +5500,70 @@ void tFreeSSubQueryMsg(SSubQueryMsg *pReq) {
 }
 
 int32_t tSerializeSOperatorParam(SEncoder* pEncoder, SOperatorParam* pOpParam) {
-  int32_t n = taosArrayGetSize(pOpParam->pOpParams);
+  if (tEncodeI32(pEncoder, pOpParam->opType) < 0) return -1;
+  switch (pOpParam->opType) {
+    case QUERY_NODE_PHYSICAL_PLAN_TABLE_SCAN: {
+      STableScanOperatorParam* pScan = (STableScanOperatorParam*)pOpParam->value;
+      int32_t uidNum = taosArrayGetSize(pScan->pUidList);
+      if (tEncodeI32(pEncoder, uidNum) < 0) return -1;
+      for (int32_t m = 0; m < uidNum; ++m) {
+        int64_t* pUid = taosArrayGet(pScan->pUidList, m);
+        if (tEncodeI64(pEncoder, *pUid) < 0) return -1;
+      }
+      break;
+    }
+    default:
+      return TSDB_CODE_INVALID_PARA;
+  }
+  
+  int32_t n = taosArrayGetSize(pOpParam->pChildren);
   if (tEncodeI32(pEncoder, n) < 0) return -1;
   for (int32_t i = 0; i < n; ++i) {
-    SOperatorSpecParam* pSpec = (SOperatorSpecParam*)taosArrayGet(pOpParam->pOpParams, i);
-    if (tEncodeI32(pEncoder, pSpec->opType) < 0) return -1;
-    switch (pSpec->opType) {
-      case QUERY_NODE_PHYSICAL_PLAN_TABLE_SCAN: {
-        STableScanOperatorParam* pScan = (STableScanOperatorParam*)pSpec->value;
-        if (pScan->pChild) {
-          if (tSerializeSOperatorParam(pEncoder, pScan->pChild) < 0) return -1;
-        } else {
-          if (tEncodeI32(pEncoder, 0) < 0) return -1;
-        }
-        int32_t uidNum = taosArrayGetSize(pScan->pUidList);
-        if (tEncodeI32(pEncoder, uidNum) < 0) return -1;
-        for (int32_t m = 0; m < uidNum; ++m) {
-          int64_t* pUid = taosArrayGet(pScan->pUidList, m);
-          if (tEncodeI64(pEncoder, *pUid) < 0) return -1;
-        }
-        break;
-      }
-      default:
-        return TSDB_CODE_INVALID_PARA;
-    }
+    SOperatorParam* pChild = *(SOperatorParam**)taosArrayGet(pOpParam->pChildren, i);
+    if (tSerializeSOperatorParam(pEncoder, pChild) < 0) return -1;
   }
 
   return 0;
 }
 
-int32_t tDeserializeSOperatorParam(SDecoder *pDecoder, SOperatorParam* pOpParam, int32_t specNum) {
-  pOpParam->pOpParams = taosArrayInit(specNum, sizeof(SOperatorSpecParam));
-  if (NULL == pOpParam->pOpParams) return -1;
-
-  SOperatorSpecParam specParam;
-  for (int32_t i = 0; i < specNum; ++i) {
-    if (tDecodeI32(pDecoder, &specParam.opType) < 0) return -1;
-    switch (specParam.opType) {
-      case QUERY_NODE_PHYSICAL_PLAN_TABLE_SCAN: {
-        STableScanOperatorParam* pScan = taosMemoryMalloc(sizeof(STableScanOperatorParam));
-        if (NULL == pScan) return -1;
-        int32_t childSpecNum = 0;
-        if (tDecodeI32(pDecoder, &childSpecNum) < 0) return -1;
-        if (childSpecNum > 0) {
-          pScan->pChild = taosMemoryMalloc(sizeof(SOperatorParam));
-          if (NULL == pScan->pChild) return -1;
-          if (tDeserializeSOperatorParam(pDecoder, pScan->pChild, childSpecNum) < 0) return -1;
+int32_t tDeserializeSOperatorParam(SDecoder *pDecoder, SOperatorParam* pOpParam) {
+  if (tDecodeI32(pDecoder, &pOpParam->opType) < 0) return -1;
+  switch (pOpParam->opType) {
+    case QUERY_NODE_PHYSICAL_PLAN_TABLE_SCAN: {
+      STableScanOperatorParam* pScan = taosMemoryMalloc(sizeof(STableScanOperatorParam));
+      if (NULL == pScan) return -1;
+      int32_t uidNum = 0;
+      int64_t uid = 0;
+      if (tDecodeI32(pDecoder, &uidNum) < 0) return -1;
+      if (uidNum > 0) {
+        pScan->pUidList = taosArrayInit(uidNum, sizeof(int64_t));
+        if (NULL == pScan->pUidList) return -1;
+        for (int32_t m = 0; m < uidNum; ++m) {
+          if (tDecodeI64(pDecoder, &uid) < 0) return -1;
+          taosArrayPush(pScan->pUidList, &uid);
         }
-        int32_t uidNum = 0;
-        int64_t uid = 0;
-        if (tDecodeI32(pDecoder, &uidNum) < 0) return -1;
-        if (uidNum > 0) {
-          pScan->pUidList = taosArrayInit(uidNum, sizeof(int64_t));
-          if (NULL == pScan->pUidList) return -1;
-          for (int32_t m = 0; m < uidNum; ++m) {
-            if (tDecodeI64(pDecoder, &uid) < 0) return -1;
-            taosArrayPush(pScan->pUidList, &uid);
-          }
-        }
-        specParam.value = pScan;
-        break;
+      } else {
+        pScan->pUidList = NULL;
       }
-      default:
-        return TSDB_CODE_INVALID_PARA;
+      break;
     }
-    taosArrayPush(pOpParam->pOpParams, &specParam);
+    default:
+      return TSDB_CODE_INVALID_PARA;
+  }
+
+  int32_t childrenNum = 0;
+  if (tDecodeI32(pDecoder, &childrenNum) < 0) return -1;
+  if (childrenNum > 0) {
+    pOpParam->pChildren = taosArrayInit(childrenNum, POINTER_BYTES);
+    if (NULL == pOpParam->pChildren) return -1;
+    for (int32_t i = 0; i < childrenNum; ++i) {
+      SOperatorParam* pChild = taosMemoryCalloc(1, sizeof(SOperatorParam));
+      if (NULL == pChild) return -1;
+      if (tDeserializeSOperatorParam(pDecoder, pChild) < 0) return -1;
+      taosArrayPush(pOpParam->pChildren, &pChild);
+    }
+  } else {
+    pOpParam->pChildren = NULL;
   }
 
   return 0;
@@ -5587,6 +5586,7 @@ int32_t tSerializeSResFetchReq(void *buf, int32_t bufLen, SResFetchReq *pReq) {
   if (tEncodeU64(&encoder, pReq->taskId) < 0) return -1;
   if (tEncodeI32(&encoder, pReq->execId) < 0) return -1;
   if (pReq->pOpParam) {
+    if (tEncodeI32(&encoder, 1) < 0) return -1;
     if (tSerializeSOperatorParam(&encoder, pReq->pOpParam) < 0) return -1;
   } else {
     if (tEncodeI32(&encoder, 0) < 0) return -1;
@@ -5623,12 +5623,12 @@ int32_t tDeserializeSResFetchReq(void *buf, int32_t bufLen, SResFetchReq *pReq)
   if (tDecodeU64(&decoder, &pReq->taskId) < 0) return -1;
   if (tDecodeI32(&decoder, &pReq->execId) < 0) return -1;
 
-  int32_t specNum = 0;
-  if (tDecodeI32(&decoder, &specNum) < 0) return -1;
-  if (specNum > 0) {
+  int32_t paramNum = 0;
+  if (tDecodeI32(&decoder, &paramNum) < 0) return -1;
+  if (paramNum > 0) {
     pReq->pOpParam = taosMemoryMalloc(sizeof(*pReq->pOpParam));
     if (NULL == pReq->pOpParam) return -1;
-    if (tDeserializeSOperatorParam(&decoder, pReq->pOpParam, specNum) < 0) return -1;
+    if (tDeserializeSOperatorParam(&decoder, pReq->pOpParam) < 0) return -1;
   }
   
   tEndDecode(&decoder);
diff --git a/source/libs/executor/inc/executorInt.h b/source/libs/executor/inc/executorInt.h
index 59bb83ec9e..b73e347f5d 100644
--- a/source/libs/executor/inc/executorInt.h
+++ b/source/libs/executor/inc/executorInt.h
@@ -149,11 +149,9 @@ typedef struct SLimitInfo {
 } SLimitInfo;
 
 typedef struct SSortMergeJoinOperatorParam {
-  SOperatorParam* pChild;
 } SSortMergeJoinOperatorParam;
 
 typedef struct SExchangeOperatorParam {
-  SOperatorParam* pChild;
   int32_t         vgId;
   int32_t         srcOpType;
   SArray*         uidList;
diff --git a/source/libs/executor/inc/groupcache.h b/source/libs/executor/inc/groupcache.h
index d5e65be0ee..62b06f62a5 100755
--- a/source/libs/executor/inc/groupcache.h
+++ b/source/libs/executor/inc/groupcache.h
@@ -62,6 +62,11 @@ typedef struct SGcSessionCtx {
   SGcBlkBufInfo*  pLastBlk; 
 } SGcSessionCtx;
 
+typedef struct SGcExecInfo {
+  int32_t  downstreamNum;
+  int64_t* pDownstreamBlkNum;
+} SGcExecInfo;
+
 typedef struct SGroupCacheOperatorInfo {
   SSHashObj*        pSessionHash;  
   SGroupColsInfo    groupColsInfo;
@@ -69,6 +74,7 @@ typedef struct SGroupCacheOperatorInfo {
   SSHashObj*        pBlkHash;  
   int64_t           pCurrentId;
   SGcSessionCtx*    pCurrent;
+  SGcExecInfo       execInfo;
 } SGroupCacheOperatorInfo;
 
 #ifdef __cplusplus
diff --git a/source/libs/executor/inc/operator.h b/source/libs/executor/inc/operator.h
index 44be65f74b..8bd80c438f 100644
--- a/source/libs/executor/inc/operator.h
+++ b/source/libs/executor/inc/operator.h
@@ -73,7 +73,7 @@ typedef struct SOperatorInfo {
   SExecTaskInfo*         pTaskInfo;
   SOperatorCostInfo      cost;
   SResultInfo            resultInfo;
-  SOperatorBaseParam*    pOperatorParam;
+  SOperatorParam*        pOperatorParam;
   SOperatorParam**       pDownstreamParams;
   struct SOperatorInfo** pDownstream;      // downstram pointer list
   int32_t                numOfDownstream;  // number of downstream. The value is always ONE expect for join operator
diff --git a/source/libs/executor/src/dynqueryctrloperator.c b/source/libs/executor/src/dynqueryctrloperator.c
index 1cf91d8295..842b21097e 100755
--- a/source/libs/executor/src/dynqueryctrloperator.c
+++ b/source/libs/executor/src/dynqueryctrloperator.c
@@ -41,48 +41,43 @@ static FORCE_INLINE int32_t buildGroupCacheOperatorParam(SOperatorParam** ppRes,
   if (NULL == *ppRes) {
     return TSDB_CODE_OUT_OF_MEMORY;
   }
-  (*ppRes)->pOpParams = taosArrayInit(1, sizeof(SOperatorSpecParam));
+  (*ppRes)->pChildren = taosArrayInit(1, POINTER_BYTES);
   if (NULL == *ppRes) {
     return TSDB_CODE_OUT_OF_MEMORY;
   }
+  if (NULL == taosArrayPush((*ppRes)->pChildren, &pChild)) {
+    return TSDB_CODE_OUT_OF_MEMORY;
+  }
 
   SGcOperatorParam* pGc = taosMemoryMalloc(sizeof(SGcOperatorParam));
   if (NULL == pGc) {
     return TSDB_CODE_OUT_OF_MEMORY;
   }
 
-  pGc->pChild = pChild;
   pGc->sessionId = atomic_add_fetch_64(&gSessionId, 1);
   pGc->downstreamIdx = downstreamIdx;
   pGc->needCache = needCache;
   pGc->pGroupValue = pGrpValue;
   pGc->groupValueSize = grpValSize;
 
-  SOperatorSpecParam specParam;
-  specParam.opType = QUERY_NODE_PHYSICAL_PLAN_GROUP_CACHE;
-  specParam.value = pGc;
-
-  taosArrayPush((*ppRes)->pOpParams, &specParam);
+  (*ppRes)->opType = QUERY_NODE_PHYSICAL_PLAN_GROUP_CACHE;
+  (*ppRes)->value = pGc;
 
   return TSDB_CODE_SUCCESS;
 }
 
-static FORCE_INLINE int32_t buildExchangeOperatorParam(SOperatorParam** ppRes, int32_t* pVgId, int64_t* pUid, SOperatorParam* pChild) {
+static FORCE_INLINE int32_t buildExchangeOperatorParam(SOperatorParam** ppRes, int32_t downstreamIdx, int32_t* pVgId, int64_t* pUid, SOperatorParam* pChild) {
   *ppRes = taosMemoryMalloc(sizeof(SOperatorParam));
   if (NULL == *ppRes) {
     return TSDB_CODE_OUT_OF_MEMORY;
   }
-  (*ppRes)->pOpParams = taosArrayInit(1, sizeof(SOperatorSpecParam));
-  if (NULL == *ppRes) {
-    return TSDB_CODE_OUT_OF_MEMORY;
-  }
+  (*ppRes)->pChildren = NULL;
   
   SExchangeOperatorParam* pExc = taosMemoryMalloc(sizeof(SExchangeOperatorParam));
   if (NULL == pExc) {
     return TSDB_CODE_OUT_OF_MEMORY;
   }
   
-  pExc->pChild = pChild;
   pExc->vgId = *pVgId;
   pExc->srcOpType = QUERY_NODE_PHYSICAL_PLAN_TABLE_SCAN;
   pExc->uidList = taosArrayInit(1, sizeof(int64_t));
@@ -92,12 +87,10 @@ static FORCE_INLINE int32_t buildExchangeOperatorParam(SOperatorParam** ppRes, i
   }
   taosArrayPush(pExc->uidList, pUid);
 
-  SOperatorSpecParam specParam;
-  specParam.opType = QUERY_NODE_PHYSICAL_PLAN_EXCHANGE;
-  specParam.value = pExc;
-
-  taosArrayPush((*ppRes)->pOpParams, &specParam);
-
+  (*ppRes)->opType = QUERY_NODE_PHYSICAL_PLAN_EXCHANGE;
+  (*ppRes)->downstreamIdx = downstreamIdx;
+  (*ppRes)->value = pExc;
+  
   return TSDB_CODE_SUCCESS;
 }
 
@@ -106,28 +99,24 @@ static FORCE_INLINE int32_t buildMergeJoinOperatorParam(SOperatorParam** ppRes,
   if (NULL == *ppRes) {
     return TSDB_CODE_OUT_OF_MEMORY;
   }
-  (*ppRes)->pOpParams = taosArrayInit(2, sizeof(SOperatorSpecParam));
+  (*ppRes)->pChildren = taosArrayInit(2, POINTER_BYTES);
   if (NULL == *ppRes) {
     return TSDB_CODE_OUT_OF_MEMORY;
   }
-  
-  SSortMergeJoinOperatorParam* pJoin0 = taosMemoryMalloc(sizeof(SSortMergeJoinOperatorParam));
-  SSortMergeJoinOperatorParam* pJoin1 = taosMemoryMalloc(sizeof(SSortMergeJoinOperatorParam));
-  if (NULL == pJoin0 || NULL == pJoin1) {
-    taosMemoryFree(pJoin0);
-    taosMemoryFree(pJoin1);
+  if (NULL == taosArrayPush((*ppRes)->pChildren, &pChild0)) {
+    return TSDB_CODE_OUT_OF_MEMORY;
+  }
+  if (NULL == taosArrayPush((*ppRes)->pChildren, &pChild1)) {
     return TSDB_CODE_OUT_OF_MEMORY;
   }
   
-  pJoin0->pChild = pChild0;
-  pJoin1->pChild = pChild1;
-
-  SOperatorSpecParam specParam;
-  specParam.opType = QUERY_NODE_PHYSICAL_PLAN_MERGE_JOIN;
-  specParam.value = pJoin0;
-  taosArrayPush((*ppRes)->pOpParams, &specParam);
-  specParam.value = pJoin1;
-  taosArrayPush((*ppRes)->pOpParams, &specParam);
+  SSortMergeJoinOperatorParam* pJoin = taosMemoryMalloc(sizeof(SSortMergeJoinOperatorParam));
+  if (NULL == pJoin) {
+    return TSDB_CODE_OUT_OF_MEMORY;
+  }
+  
+  (*ppRes)->opType = QUERY_NODE_PHYSICAL_PLAN_MERGE_JOIN;
+  (*ppRes)->value = pJoin;
 
   return TSDB_CODE_SUCCESS;
 }
@@ -142,11 +131,11 @@ static int32_t buildStbJoinOperatorParam(SDynQueryCtrlOperatorInfo* pInfo, SStbJ
   SOperatorParam*             pExcParam0 = NULL;
   SOperatorParam*             pExcParam1 = NULL;
   SOperatorParam*             pGcParam0 = NULL;
-  SOperatorParam*             pGcParam1 = NULL;
+  SOperatorParam*             pGcParam1 = NULL;  
   
-  int32_t code = buildExchangeOperatorParam(&pExcParam0, (int32_t*)(pVg0->pData + pVg0->info.bytes * rowIdx), (int64_t*)(pUid0->pData + pUid0->info.bytes * rowIdx), NULL);
+  int32_t code = buildExchangeOperatorParam(&pExcParam0, 0, (int32_t*)(pVg0->pData + pVg0->info.bytes * rowIdx), (int64_t*)(pUid0->pData + pUid0->info.bytes * rowIdx), NULL);
   if (TSDB_CODE_SUCCESS == code) {
-    code = buildExchangeOperatorParam(&pExcParam1, (int32_t*)(pVg1->pData + pVg1->info.bytes * rowIdx), (int64_t*)(pUid1->pData + pUid1->info.bytes * rowIdx), NULL);
+    code = buildExchangeOperatorParam(&pExcParam1, 1, (int32_t*)(pVg1->pData + pVg1->info.bytes * rowIdx), (int64_t*)(pUid1->pData + pUid1->info.bytes * rowIdx), NULL);
   }
   if (TSDB_CODE_SUCCESS == code) {
     code = buildGroupCacheOperatorParam(&pGcParam0, 0, false, pUid0->pData + pUid0->info.bytes * rowIdx, pUid0->info.bytes, pExcParam0);
diff --git a/source/libs/executor/src/exchangeoperator.c b/source/libs/executor/src/exchangeoperator.c
index 1ef87875ae..978216914b 100644
--- a/source/libs/executor/src/exchangeoperator.c
+++ b/source/libs/executor/src/exchangeoperator.c
@@ -93,7 +93,7 @@ static void concurrentlyLoadRemoteDataImpl(SOperatorInfo* pOperator, SExchangeIn
       }
 
       SRetrieveTableRsp*     pRsp = pDataInfo->pRsp;
-      SDownstreamSourceNode* pSource = taosArrayGet(pExchangeInfo->pSources, i);
+      SDownstreamSourceNode* pSource = taosArrayGet(pExchangeInfo->pSources, pDataInfo->index);
 
       // todo
       SLoadRemoteDataInfo* pLoadInfo = &pExchangeInfo->loadInfo;
@@ -422,27 +422,20 @@ int32_t buildTableScanOperatorParam(SOperatorParam** ppRes, SArray* pUidList, in
   if (NULL == *ppRes) {
     return TSDB_CODE_OUT_OF_MEMORY;
   }
-  (*ppRes)->pOpParams = taosArrayInit(1, sizeof(SOperatorSpecParam));
-  if (NULL == *ppRes) {
-    return TSDB_CODE_OUT_OF_MEMORY;
-  }
 
   STableScanOperatorParam* pScan = taosMemoryMalloc(sizeof(STableScanOperatorParam));
   if (NULL == pScan) {
     return TSDB_CODE_OUT_OF_MEMORY;
   }
 
-  pScan->pChild = NULL;
   pScan->pUidList = taosArrayDup(pUidList, NULL);
   if (NULL == pScan->pUidList) {
     return TSDB_CODE_OUT_OF_MEMORY;
   }
   
-  SOperatorSpecParam specParam;
-  specParam.opType = srcOpType;
-  specParam.value = pScan;
-
-  taosArrayPush((*ppRes)->pOpParams, &specParam);
+  (*ppRes)->opType = srcOpType;
+  (*ppRes)->value = pScan;
+  (*ppRes)->pChildren = NULL;
 
   return TSDB_CODE_SUCCESS;
 }
@@ -753,7 +746,7 @@ _error:
 
 int32_t addDynamicExchangeSource(SOperatorInfo* pOperator) {
   SExchangeInfo* pExchangeInfo = pOperator->info;
-  SExchangeOperatorParam* pParam = (SExchangeOperatorParam*)pOperator->pOperatorParam;
+  SExchangeOperatorParam* pParam = (SExchangeOperatorParam*)pOperator->pOperatorParam->value;
   int32_t* pIdx = tSimpleHashGet(pExchangeInfo->pHashSources, &pParam->vgId, sizeof(pParam->vgId));
   if (NULL == pIdx) {
     qError("No exchange source for vgId: %d", pParam->vgId);
diff --git a/source/libs/executor/src/groupcacheoperator.c b/source/libs/executor/src/groupcacheoperator.c
index 47dd761a18..939b516d73 100755
--- a/source/libs/executor/src/groupcacheoperator.c
+++ b/source/libs/executor/src/groupcacheoperator.c
@@ -66,9 +66,23 @@ static void freeGroupCacheBufPage(void* param) {
   taosMemoryFree(pInfo->data);
 }
 
+static void logGroupCacheExecInfo(SGroupCacheOperatorInfo* pGrpCacheOperator) {
+  char* buf = taosMemoryMalloc(pGrpCacheOperator->execInfo.downstreamNum * 32 + 100);
+  if (NULL == buf) {
+    return;
+  }
+  int32_t offset = sprintf(buf, "groupCache exec info, downstreamBlkNum:");
+  for (int32_t i = 0; i < pGrpCacheOperator->execInfo.downstreamNum; ++i) {
+    offset += sprintf(buf + offset, " %" PRId64 , pGrpCacheOperator->execInfo.pDownstreamBlkNum[i]);
+  }
+  qDebug("%s", buf);
+}
+
 static void destroyGroupCacheOperator(void* param) {
   SGroupCacheOperatorInfo* pGrpCacheOperator = (SGroupCacheOperatorInfo*)param;
 
+  logGroupCacheExecInfo(pGrpCacheOperator);
+  
   taosMemoryFree(pGrpCacheOperator->groupColsInfo.pColsInfo);
   taosMemoryFree(pGrpCacheOperator->groupColsInfo.pBuf);
   taosArrayDestroyEx(pGrpCacheOperator->pBlkBufs, freeGroupCacheBufPage);
@@ -191,7 +205,7 @@ static void addBlkToGroupCache(struct SOperatorInfo* pOperator, SSDataBlock* pBl
 SSDataBlock* getFromGroupCache(struct SOperatorInfo* pOperator) {
   SGroupCacheOperatorInfo* pGCache = pOperator->info;
   SExecTaskInfo* pTaskInfo = pOperator->pTaskInfo;
-  SGcOperatorParam* pParam = (SGcOperatorParam*)pOperator->pOperatorParam;
+  SGcOperatorParam* pParam = (SGcOperatorParam*)pOperator->pOperatorParam->value;
   SGcSessionCtx* pSession = NULL;
   SSDataBlock* pRes = NULL;
   int32_t code = TSDB_CODE_SUCCESS;
@@ -211,8 +225,12 @@ SSDataBlock* getFromGroupCache(struct SOperatorInfo* pOperator) {
       break;
     }
 
+    pGCache->execInfo.pDownstreamBlkNum[pSession->downstreamIdx]++;
+    
     if (pGCache->pCurrent->needCache) {
       addBlkToGroupCache(pOperator, pBlock, &pRes);
+    } else {
+      pRes = pBlock;
     }
     break;
   }
@@ -220,6 +238,15 @@ SSDataBlock* getFromGroupCache(struct SOperatorInfo* pOperator) {
   return pRes;
 }
 
+static int32_t initGroupCacheExecInfo(SOperatorInfo*        pOperator) {
+  SGroupCacheOperatorInfo* pInfo = pOperator->info;
+  pInfo->execInfo.downstreamNum = pOperator->numOfDownstream;
+  pInfo->execInfo.pDownstreamBlkNum = taosMemoryCalloc(pOperator->numOfDownstream, sizeof(int64_t));
+  if (NULL == pInfo->execInfo.pDownstreamBlkNum) {
+    return TSDB_CODE_OUT_OF_MEMORY;
+  }
+  return TSDB_CODE_SUCCESS;
+}
 
 SOperatorInfo* createGroupCacheOperatorInfo(SOperatorInfo** pDownstream, int32_t numOfDownstream,
                                            SGroupCachePhysiNode* pPhyciNode, SExecTaskInfo* pTaskInfo) {
@@ -263,6 +290,11 @@ SOperatorInfo* createGroupCacheOperatorInfo(SOperatorInfo** pDownstream, int32_t
     goto _error;
   }
 
+  code = initGroupCacheExecInfo(pOperator);
+  if (TSDB_CODE_SUCCESS != code) {
+    goto _error;
+  }
+
   pOperator->fpSet = createOperatorFpSet(optrDummyOpenFn, getFromGroupCache, NULL, destroyGroupCacheOperator, optrDefaultBufFn, NULL, optrDefaultGetNextExtFn, NULL);
 
   return pOperator;
diff --git a/source/libs/executor/src/operator.c b/source/libs/executor/src/operator.c
index b99562f879..9f0659cb2e 100644
--- a/source/libs/executor/src/operator.c
+++ b/source/libs/executor/src/operator.c
@@ -605,26 +605,14 @@ int32_t getOperatorExplainExecInfo(SOperatorInfo* operatorInfo, SArray* pExecInf
   return TSDB_CODE_SUCCESS;
 }
 
-void *getOperatorParam(int32_t opType, SOperatorParam* param, int32_t idx) {
-  if (NULL == param) {
-    return NULL;
-  }
-  int32_t opNum = taosArrayGetSize(param->pOpParams);
-  if (idx >= opNum) {
-    return NULL;
-  }
-  SOperatorSpecParam *pSpecParam = taosArrayGet(param->pOpParams, idx);
-  if (opType == pSpecParam->opType) {
-    return pSpecParam->value;
-  }
-  return NULL;
-}
-
 int32_t setOperatorParams(struct SOperatorInfo* pOperator, SOperatorParam* pParam) {
   if (NULL == pParam) {
+    pOperator->pOperatorParam = NULL;
     taosMemoryFreeClear(pOperator->pDownstreamParams);
     return TSDB_CODE_SUCCESS;
   }
+
+  pOperator->pOperatorParam = (pParam->opType == pOperator->operatorType) ? pParam : NULL;
   
   if (NULL == pOperator->pDownstreamParams) {
     pOperator->pDownstreamParams = taosMemoryCalloc(pOperator->numOfDownstream, POINTER_BYTES);
@@ -632,16 +620,24 @@ int32_t setOperatorParams(struct SOperatorInfo* pOperator, SOperatorParam* pPara
       return TSDB_CODE_OUT_OF_MEMORY;
     }
   }
-  
-  SOperatorBaseParam* pBaseParam = NULL;
 
-  for (int32_t i = 0; i < pOperator->numOfDownstream; ++i) {
-    pBaseParam = getOperatorParam(pOperator->operatorType, pParam, i);
-    if (pBaseParam) {
-      pOperator->pDownstreamParams[i] = pBaseParam->pChild;
-    } else {
+  if (NULL == pOperator->pOperatorParam) {
+    for (int32_t i = 0; i < pOperator->numOfDownstream; ++i) {
       pOperator->pDownstreamParams[i] = pParam;
     }
+    return TSDB_CODE_SUCCESS;
+  }
+
+  memset(pOperator->pDownstreamParams, 0, pOperator->numOfDownstream * POINTER_BYTES);
+
+  int32_t childrenNum = taosArrayGetSize(pOperator->pOperatorParam->pChildren);
+  if (childrenNum <= 0) {
+    return TSDB_CODE_SUCCESS;
+  }
+  
+  for (int32_t i = 0; i < childrenNum; ++i) {
+    SOperatorParam* pChild = *(SOperatorParam**)taosArrayGet(pOperator->pOperatorParam->pChildren, i);
+    pOperator->pDownstreamParams[pChild->downstreamIdx] = pChild;
   }
 
   return TSDB_CODE_SUCCESS;
@@ -671,8 +667,7 @@ SSDataBlock* getNextBlockFromDownstreamOnce(struct SOperatorInfo* pOperator, int
 
 
 SSDataBlock* optrDefaultGetNextExtFn(struct SOperatorInfo* pOperator, SOperatorParam* pParam) {
-  pOperator->pOperatorParam = getOperatorParam(pOperator->operatorType, pParam, 0);
-  int32_t code = setOperatorParams(pOperator, pOperator->pOperatorParam ? pOperator->pOperatorParam->pChild : pParam);
+  int32_t code = setOperatorParams(pOperator, pParam);
   if (TSDB_CODE_SUCCESS != code) {
     pOperator->pTaskInfo->code = code;
     T_LONG_JMP(pOperator->pTaskInfo->env, pOperator->pTaskInfo->code);
diff --git a/source/libs/executor/src/scanoperator.c b/source/libs/executor/src/scanoperator.c
index 26ef9aae4b..e7cefb8cd6 100644
--- a/source/libs/executor/src/scanoperator.c
+++ b/source/libs/executor/src/scanoperator.c
@@ -789,7 +789,7 @@ static int32_t createTableListInfoFromParam(SOperatorInfo* pOperator) {
   SExecTaskInfo*  pTaskInfo = pOperator->pTaskInfo;  
   int32_t code = 0;
   STableListInfo* pListInfo = pInfo->base.pTableListInfo;
-  STableScanOperatorParam* pParam = (STableScanOperatorParam*)pOperator->pOperatorParam;
+  STableScanOperatorParam* pParam = (STableScanOperatorParam*)pOperator->pOperatorParam->value;
   int32_t num = taosArrayGetSize(pParam->pUidList);
   if (num <= 0) {
     qError("empty table scan uid list");
@@ -797,6 +797,9 @@ static int32_t createTableListInfoFromParam(SOperatorInfo* pOperator) {
   }
   
   qDebug("add total %d dynamic tables to scan", num);
+
+  taosArrayClear(pListInfo->pTableList);
+  taosHashClear(pListInfo->map);
   
   for (int32_t i = 0; i < num; ++i) {
     uint64_t* pUid = taosArrayGet(pParam->pUidList, i);
@@ -816,6 +819,32 @@ static int32_t createTableListInfoFromParam(SOperatorInfo* pOperator) {
   return code;
 }
 
+static SSDataBlock* startNextGroupScan(SOperatorInfo* pOperator) {
+  STableScanInfo* pInfo = pOperator->info;
+  SExecTaskInfo*  pTaskInfo = pOperator->pTaskInfo;
+  SStorageAPI*    pAPI = &pTaskInfo->storageAPI;
+
+  // reset value for the next group data output
+  pOperator->status = OP_OPENED;
+  resetLimitInfoForNextGroup(&pInfo->base.limitInfo);
+  
+  int32_t        num = 0;
+  STableKeyInfo* pList = NULL;
+  tableListGetGroupList(pInfo->base.pTableListInfo, pInfo->currentGroupId, &pList, &num);
+  
+  pAPI->tsdReader.tsdSetQueryTableList(pInfo->base.dataReader, pList, num);
+  pAPI->tsdReader.tsdReaderResetStatus(pInfo->base.dataReader, &pInfo->base.cond);
+  pInfo->scanTimes = 0;
+  
+  SSDataBlock* result = doGroupedTableScan(pOperator);
+  if (result != NULL) {
+    return result;
+  }
+  
+  setOperatorCompleted(pOperator);
+  return NULL;
+}
+
 static SSDataBlock* doTableScan(SOperatorInfo* pOperator) {
   STableScanInfo* pInfo = pOperator->info;
   SExecTaskInfo*  pTaskInfo = pOperator->pTaskInfo;
@@ -827,6 +856,10 @@ static SSDataBlock* doTableScan(SOperatorInfo* pOperator) {
       pTaskInfo->code = code;
       T_LONG_JMP(pTaskInfo->env, code);
     }
+    
+    if (pInfo->currentGroupId != -1) {
+      return startNextGroupScan(pOperator);
+    }
   }
 
   // scan table one by one sequentially
@@ -895,25 +928,7 @@ static SSDataBlock* doTableScan(SOperatorInfo* pOperator) {
       return NULL;
     }
 
-    // reset value for the next group data output
-    pOperator->status = OP_OPENED;
-    resetLimitInfoForNextGroup(&pInfo->base.limitInfo);
-
-    int32_t        num = 0;
-    STableKeyInfo* pList = NULL;
-    tableListGetGroupList(pInfo->base.pTableListInfo, pInfo->currentGroupId, &pList, &num);
-
-    pAPI->tsdReader.tsdSetQueryTableList(pInfo->base.dataReader, pList, num);
-    pAPI->tsdReader.tsdReaderResetStatus(pInfo->base.dataReader, &pInfo->base.cond);
-    pInfo->scanTimes = 0;
-
-    result = doGroupedTableScan(pOperator);
-    if (result != NULL) {
-      return result;
-    }
-
-    setOperatorCompleted(pOperator);
-    return NULL;
+    return startNextGroupScan(pOperator);
   }
 }
 
diff --git a/source/libs/qworker/inc/qwInt.h b/source/libs/qworker/inc/qwInt.h
index 4f43f31226..0a4470da00 100644
--- a/source/libs/qworker/inc/qwInt.h
+++ b/source/libs/qworker/inc/qwInt.h
@@ -124,6 +124,7 @@ typedef struct SQWTaskCtx {
   int32_t  queryMsgType;
   int32_t  fetchMsgType;
   int32_t  level;
+  int32_t  dynExecId;
   uint64_t sId;
 
   bool    queryGotData;
diff --git a/source/libs/qworker/src/qworker.c b/source/libs/qworker/src/qworker.c
index 06becf99d2..ab676076f1 100644
--- a/source/libs/qworker/src/qworker.c
+++ b/source/libs/qworker/src/qworker.c
@@ -488,14 +488,22 @@ int32_t qwQuickRspFetchReq(QW_FPARAMS_DEF, SQWTaskCtx    * ctx, SQWMsg *qwMsg, i
 }
 
 int32_t qwStartDynamicTaskNewExec(QW_FPARAMS_DEF, SQWTaskCtx *ctx, SQWMsg *qwMsg) {
-  if (!ctx->queryExecDone || !ctx->queryEnd) {
-    QW_TASK_ELOG("dynamic task prev exec not finished, execDone:%d, queryEnd:%d", ctx->queryExecDone, ctx->queryEnd);
+  if (!atomic_val_compare_exchange_8((int8_t*)&ctx->queryExecDone, true, false)) {
+    QW_TASK_ELOG("dynamic task prev exec not finished, execDone:%d", ctx->queryExecDone);
     return TSDB_CODE_ACTION_IN_PROGRESS;
   }
+  if (!atomic_val_compare_exchange_8((int8_t*)&ctx->queryEnd, true, false)) {
+    QW_TASK_ELOG("dynamic task prev exec not finished, queryEnd:%d", ctx->queryEnd);
+    return TSDB_CODE_ACTION_IN_PROGRESS;
+  }  
   
   qUpdateOperatorParam(ctx->taskHandle, qwMsg->msg);
 
+  QW_SET_EVENT_RECEIVED(ctx, QW_EVENT_FETCH);
+
   atomic_store_8((int8_t *)&ctx->queryInQueue, 1);
+
+  QW_TASK_DLOG("the %dth dynamic task exec started", ctx->dynExecId++);
   
   QW_ERR_RET(qwBuildAndSendCQueryMsg(QW_FPARAMS(), &qwMsg->connInfo));
 
@@ -515,7 +523,7 @@ int32_t qwHandlePrePhaseEvents(QW_FPARAMS_DEF, int8_t phase, SQWPhaseInput *inpu
 
   QW_SET_PHASE(ctx, phase);
 
-  if (atomic_load_8((int8_t *)&ctx->queryEnd)) {
+  if (atomic_load_8((int8_t *)&ctx->queryEnd) && !ctx->dynamicTask) {
     QW_TASK_ELOG_E("query already end");
     QW_ERR_JRET(TSDB_CODE_QW_MSG_ERROR);
   }