diff --git a/source/common/src/tdatablock.c b/source/common/src/tdatablock.c
index 816fdab3d24aa848877f4af8f0444812cfadc140..733693f5847624b0788860ca5c6385b5cbc031ff 100644
--- a/source/common/src/tdatablock.c
+++ b/source/common/src/tdatablock.c
@@ -350,7 +350,7 @@ int32_t blockDataUpdateTsWindow(SSDataBlock* pDataBlock, int32_t tsColumnIndex)
     return -1;
   }
 
-  int32_t index = (tsColumnIndex == -1)? 0:tsColumnIndex;
+  int32_t          index = (tsColumnIndex == -1) ? 0 : tsColumnIndex;
   SColumnInfoData* pColInfoData = taosArrayGet(pDataBlock->pDataBlock, index);
   if (pColInfoData->info.type != TSDB_DATA_TYPE_TIMESTAMP) {
     return 0;
@@ -599,8 +599,8 @@ int32_t blockDataFromBuf(SSDataBlock* pBlock, const char* buf) {
 }
 
 int32_t blockDataFromBuf1(SSDataBlock* pBlock, const char* buf, size_t capacity) {
-  pBlock->info.rows = *(int32_t*) buf;
-  pBlock->info.groupId = *(uint64_t*) (buf + sizeof(int32_t));
+  pBlock->info.rows = *(int32_t*)buf;
+  pBlock->info.groupId = *(uint64_t*)(buf + sizeof(int32_t));
 
   int32_t     numOfCols = pBlock->info.numOfCols;
   const char* pStart = buf + sizeof(uint32_t) + sizeof(uint64_t);
@@ -669,7 +669,7 @@ size_t blockDataGetSerialMetaSize(const SSDataBlock* pBlock) {
   return sizeof(int32_t) + sizeof(uint64_t) + pBlock->info.numOfCols * sizeof(int32_t);
 }
 
-double  blockDataGetSerialRowSize(const SSDataBlock* pBlock) {
+double blockDataGetSerialRowSize(const SSDataBlock* pBlock) {
   ASSERT(pBlock != NULL);
   double rowSize = 0;
 
@@ -1232,7 +1232,7 @@ size_t blockDataGetCapacityInRow(const SSDataBlock* pBlock, size_t pageSize) {
 
   // the true value must be less than the value of nRows
   int32_t additional = 0;
-  for(int32_t i = 0; i < pBlock->info.numOfCols; ++i) {
+  for (int32_t i = 0; i < pBlock->info.numOfCols; ++i) {
     SColumnInfoData* pCol = taosArrayGet(pBlock->pDataBlock, i);
     if (IS_VAR_DATA_TYPE(pCol->info.type)) {
       additional += nRows * sizeof(int32_t);
@@ -1728,8 +1728,12 @@ SSubmitReq* tdBlockToSubmit(const SArray* pBlocks, const STSchema* pTSchema, boo
       for (int32_t k = 0; k < pTSchema->numOfCols; k++) {
         const STColumn*  pColumn = &pTSchema->columns[k];
         SColumnInfoData* pColData = taosArrayGet(pDataBlock->pDataBlock, k);
-        void*            data = colDataGetData(pColData, j);
-        tdAppendColValToRow(&rb, pColumn->colId, pColumn->type, TD_VTYPE_NORM, data, true, pColumn->offset, k);
+        if (colDataIsNull_s(pColData, j)) {
+          tdAppendColValToRow(&rb, pColumn->colId, pColumn->type, TD_VTYPE_NONE, NULL, false, pColumn->offset, k);
+        } else {
+          void* data = colDataGetData(pColData, j);
+          tdAppendColValToRow(&rb, pColumn->colId, pColumn->type, TD_VTYPE_NORM, data, true, pColumn->offset, k);
+        }
       }
       int32_t rowLen = TD_ROW_LEN(rowData);
       rowData = POINTER_SHIFT(rowData, rowLen);
diff --git a/source/libs/stream/src/tstream.c b/source/libs/stream/src/tstream.c
index dd7e38a45808a5e886a3a3b5969bc8892e7c03b5..933b37825fdad07cd25c63b885868c62f771bfdb 100644
--- a/source/libs/stream/src/tstream.c
+++ b/source/libs/stream/src/tstream.c
@@ -158,7 +158,9 @@ static int32_t streamTaskExecImpl(SStreamTask* pTask, void* data, SArray* pRes)
       ASSERT(false);
     }
     if (output == NULL) break;
-    taosArrayPush(pRes, output);
+    // TODO: do we need free memory?
+    SSDataBlock* outputCopy = createOneDataBlock(output, true);
+    taosArrayPush(pRes, outputCopy);
   }
 
   // destroy