diff --git a/include/common/tcommon.h b/include/common/tcommon.h
index 9c0c3c0616..f841a7d4cd 100644
--- a/include/common/tcommon.h
+++ b/include/common/tcommon.h
@@ -68,7 +68,7 @@ typedef struct SDataBlockInfo {
   STimeWindow window;
   int32_t     rows;
   int32_t     rowSize;
-  int64_t     uid;      // the uid of table, from which current data block comes
+  uint64_t    uid;      // the uid of table, from which current data block comes
   uint16_t    blockId;  // block id, generated by physical planner
   uint64_t    groupId;  // no need to serialize
   int16_t     hasVarCol;
diff --git a/source/libs/executor/src/scanoperator.c b/source/libs/executor/src/scanoperator.c
index e1b9e7e3de..b1bd50daf0 100644
--- a/source/libs/executor/src/scanoperator.c
+++ b/source/libs/executor/src/scanoperator.c
@@ -969,6 +969,7 @@ static SSDataBlock* doStreamBlockScan(SOperatorInfo* pOperator) {
       uint64_t uid = 0;
       int32_t  numOfRows = 0;
 
+      // todo refactor
       int32_t code = tqRetrieveDataBlock(&block, pInfo->streamBlockReader, &groupId, &uid, &numOfRows);
 
       if (code != TSDB_CODE_SUCCESS || numOfRows == 0) {
@@ -976,12 +977,11 @@ static SSDataBlock* doStreamBlockScan(SOperatorInfo* pOperator) {
         return NULL;
       }
 
-      blockDataEnsureCapacity(pInfo->pRes, numOfRows);
-
       pInfo->pRes->info.groupId = groupId;
       pInfo->pRes->info.rows = numOfRows;
       pInfo->pRes->info.uid = uid;
       pInfo->pRes->info.type = STREAM_NORMAL;
+      pInfo->pRes->info.capacity = numOfRows;
 
       // for generating rollup SMA result, each time is an independent time serie.
       // TODO temporarily used, when the statement of "partition by tbname" is ready, remove this