diff --git a/include/common/tcommon.h b/include/common/tcommon.h
index 930b7be3ef..0b647934ff 100644
--- a/include/common/tcommon.h
+++ b/include/common/tcommon.h
@@ -54,12 +54,12 @@ enum {
 enum {
   STREAM_INPUT__DATA_SUBMIT = 1,
   STREAM_INPUT__DATA_BLOCK,
+  STREAM_INPUT__MERGED_SUBMIT,
   // STREAM_INPUT__TABLE_SCAN,
   STREAM_INPUT__TQ_SCAN,
   STREAM_INPUT__DATA_RETRIEVE,
   STREAM_INPUT__GET_RES,
   STREAM_INPUT__CHECKPOINT,
-  STREAM_INPUT__DROP,
 };
 
 typedef enum EStreamType {
diff --git a/include/libs/stream/tstream.h b/include/libs/stream/tstream.h
index 8c69c0f2de..7057227a00 100644
--- a/include/libs/stream/tstream.h
+++ b/include/libs/stream/tstream.h
@@ -77,6 +77,13 @@ typedef struct {
   SSubmitReq* data;
 } SStreamDataSubmit;
 
+typedef struct {
+  int8_t  type;
+  int64_t ver;
+  SArray* dataRefs;  // SArray<int32_t*>
+  SArray* reqs;      // SArray<SSubmitReq*>
+} SStreamMergedSubmit;
+
 typedef struct {
   int8_t type;
 
diff --git a/source/libs/stream/src/streamData.c b/source/libs/stream/src/streamData.c
index 6be15222db..6b447d05ad 100644
--- a/source/libs/stream/src/streamData.c
+++ b/source/libs/stream/src/streamData.c
@@ -77,6 +77,27 @@ FAIL:
   return NULL;
 }
 
+SStreamMergedSubmit* streamMergedSubmitNew() {
+  SStreamMergedSubmit* pMerged = (SStreamMergedSubmit*)taosAllocateQitem(sizeof(SStreamMergedSubmit), DEF_QITEM);
+  if (pMerged == NULL) return NULL;
+  pMerged->reqs = taosArrayInit(0, sizeof(void*));
+  pMerged->dataRefs = taosArrayInit(0, sizeof(void*));
+  if (pMerged->dataRefs == NULL || pMerged->reqs == NULL) goto FAIL;
+  return pMerged;
+FAIL:
+  if (pMerged->reqs) taosArrayDestroy(pMerged->reqs);
+  if (pMerged->dataRefs) taosArrayDestroy(pMerged->dataRefs);
+  taosFreeQitem(pMerged);
+  return NULL;
+}
+
+int32_t streamMergeSubmit(SStreamMergedSubmit* pMerged, SStreamDataSubmit* pSubmit) {
+  taosArrayPush(pMerged->dataRefs, pSubmit->dataRef);
+  taosArrayPush(pMerged->reqs, pSubmit->data);
+  pMerged->ver = pSubmit->ver;
+  return 0;
+}
+
 static FORCE_INLINE void streamDataSubmitRefInc(SStreamDataSubmit* pDataSubmit) {
   atomic_add_fetch_32(pDataSubmit->dataRef, 1);
 }
@@ -102,10 +123,26 @@ void streamDataSubmitRefDec(SStreamDataSubmit* pDataSubmit) {
 
 int32_t streamAppendQueueItem(SStreamQueueItem* dst, SStreamQueueItem* elem) {
   ASSERT(elem);
-  if (dst->type == elem->type && dst->type == STREAM_INPUT__DATA_BLOCK) {
+  if (dst->type == STREAM_INPUT__DATA_BLOCK && elem->type == STREAM_INPUT__DATA_BLOCK) {
     SStreamDataBlock* pBlock = (SStreamDataBlock*)dst;
     SStreamDataBlock* pBlockSrc = (SStreamDataBlock*)elem;
     taosArrayAddAll(pBlock->blocks, pBlockSrc->blocks);
+    taosArrayDestroy(pBlockSrc->blocks);
+    taosFreeQitem(elem);
+    return 0;
+  } else if (dst->type == STREAM_INPUT__MERGED_SUBMIT && elem->type == STREAM_INPUT__DATA_SUBMIT) {
+    SStreamMergedSubmit* pMerged = (SStreamMergedSubmit*)dst;
+    SStreamDataSubmit*   pBlockSrc = (SStreamDataSubmit*)elem;
+    streamMergeSubmit(pMerged, pBlockSrc);
+    taosFreeQitem(elem);
+    return 0;
+  } else if (dst->type == STREAM_INPUT__DATA_SUBMIT && elem->type == STREAM_INPUT__DATA_SUBMIT) {
+    SStreamMergedSubmit* pMerged = streamMergedSubmitNew();
+    ASSERT(pMerged);
+    streamMergeSubmit(pMerged, (SStreamDataSubmit*)dst);
+    streamMergeSubmit(pMerged, (SStreamDataSubmit*)elem);
+    taosFreeQitem(dst);
+    taosFreeQitem(elem);
     return 0;
   } else {
     return -1;
@@ -123,5 +160,20 @@ void streamFreeQitem(SStreamQueueItem* data) {
   } else if (type == STREAM_INPUT__DATA_SUBMIT) {
     streamDataSubmitRefDec((SStreamDataSubmit*)data);
     taosFreeQitem(data);
+  } else if (type == STREAM_INPUT__MERGED_SUBMIT) {
+    SStreamMergedSubmit* pMerge = (SStreamMergedSubmit*)data;
+    int32_t              sz = taosArrayGetSize(pMerge->reqs);
+    for (int32_t i = 0; i < sz; i++) {
+      int32_t* ref = taosArrayGet(pMerge->dataRefs, i);
+      (*ref)--;
+      if (*ref == 0) {
+        void* data = taosArrayGet(pMerge->reqs, i);
+        taosMemoryFree(data);
+        taosMemoryFree(ref);
+      }
+    }
+    taosArrayDestroy(pMerge->reqs);
+    taosArrayDestroy(pMerge->dataRefs);
+    taosFreeQitem(pMerge);
   }
 }
diff --git a/source/libs/stream/src/streamExec.c b/source/libs/stream/src/streamExec.c
index b59a812678..c49e6c9b6c 100644
--- a/source/libs/stream/src/streamExec.c
+++ b/source/libs/stream/src/streamExec.c
@@ -33,9 +33,12 @@ static int32_t streamTaskExecImpl(SStreamTask* pTask, void* data, SArray* pRes)
     SArray*           blocks = pBlock->blocks;
     qDebug("task %d %p set ssdata input", pTask->taskId, pTask);
     qSetMultiStreamInput(exec, blocks->pData, blocks->size, STREAM_INPUT__DATA_BLOCK, false);
-  } else if (pItem->type == STREAM_INPUT__DROP) {
-    // TODO exec drop
-    return 0;
+  } else if (pItem->type == STREAM_INPUT__MERGED_SUBMIT) {
+    SStreamMergedSubmit* pMerged = (SStreamMergedSubmit*)data;
+    SArray*              blocks = pMerged->reqs;
+    qSetMultiStreamInput(exec, blocks->pData, blocks->size, STREAM_INPUT__DATA_SUBMIT, false);
+  } else {
+    ASSERT(0);
   }
 
   // exec
@@ -155,11 +158,9 @@ static SArray* streamExecForQall(SStreamTask* pTask, SArray* pRes) {
       if (data == NULL) {
         data = qItem;
         streamQueueProcessSuccess(pTask->inputQueue);
-        if (qItem->type == STREAM_INPUT__DATA_BLOCK) {
-          /*streamUpdateVer(pTask, (SStreamDataBlock*)qItem);*/
-        } else {
-          break;
-        }
+        /*if (qItem->type == STREAM_INPUT__DATA_BLOCK) {*/
+        /*streamUpdateVer(pTask, (SStreamDataBlock*)qItem);*/
+        /*}*/
       } else {
         if (streamAppendQueueItem(data, qItem) < 0) {
           streamQueueProcessFail(pTask->inputQueue);
@@ -168,11 +169,10 @@ static SArray* streamExecForQall(SStreamTask* pTask, SArray* pRes) {
           cnt++;
           /*streamUpdateVer(pTask, (SStreamDataBlock*)qItem);*/
           streamQueueProcessSuccess(pTask->inputQueue);
-          taosArrayDestroy(((SStreamDataBlock*)qItem)->blocks);
-          taosFreeQitem(qItem);
         }
       }
     }
+
     if (pTask->taskStatus == TASK_STATUS__DROPPING) {
       if (data) streamFreeQitem(data);
       taosArrayDestroyEx(pRes, (FDelete)blockDataFreeRes);
@@ -194,6 +194,7 @@ static SArray* streamExecForQall(SStreamTask* pTask, SArray* pRes) {
     if (taosArrayGetSize(pRes) != 0) {
       SStreamDataBlock* qRes = taosAllocateQitem(sizeof(SStreamDataBlock), DEF_QITEM);
       if (qRes == NULL) {
+        // TODO log failed ver
         streamQueueProcessFail(pTask->inputQueue);
         taosArrayDestroy(pRes);
         return NULL;
@@ -201,6 +202,7 @@ static SArray* streamExecForQall(SStreamTask* pTask, SArray* pRes) {
       qRes->type = STREAM_INPUT__DATA_BLOCK;
       qRes->blocks = pRes;
       if (streamTaskOutput(pTask, qRes) < 0) {
+        // TODO log failed ver
         /*streamQueueProcessFail(pTask->inputQueue);*/
         taosArrayDestroyEx(pRes, (FDelete)blockDataFreeRes);
         taosFreeQitem(qRes);