diff --git a/source/libs/executor/src/executorimpl.c b/source/libs/executor/src/executorimpl.c
index 688901226c1ca832603e975ec49c00a1082f7f3b..e280724200a7671e42baff9b072c95eeff8cdb91 100644
--- a/source/libs/executor/src/executorimpl.c
+++ b/source/libs/executor/src/executorimpl.c
@@ -155,7 +155,7 @@ SOperatorFpSet createOperatorFpSet(__optr_open_fn_t openFn, __optr_fn_t nextFn,
 void operatorDummyCloseFn(void* param, int32_t numOfCols) {}
 
 static int32_t doCopyToSDataBlock(SExecTaskInfo* taskInfo, SSDataBlock* pBlock, SExprInfo* pExprInfo, SDiskbasedBuf* pBuf, SGroupResInfo* pGroupResInfo,
-                                  int32_t orderType, int32_t* rowCellOffset, SqlFunctionCtx* pCtx, int32_t numOfExprs);
+                                  int32_t* rowCellOffset, SqlFunctionCtx* pCtx, int32_t numOfExprs);
 
 static void initCtxOutputBuffer(SqlFunctionCtx* pCtx, int32_t size);
 static void setResultBufSize(STaskAttr* pQueryAttr, SResultInfo* pResultInfo);
@@ -2136,23 +2136,13 @@ void setExecutionContext(int32_t numOfOutput, uint64_t groupId, SExecTaskInfo* p
  * @param result
  */
 int32_t doCopyToSDataBlock(SExecTaskInfo* taskInfo, SSDataBlock* pBlock, SExprInfo* pExprInfo, SDiskbasedBuf* pBuf, SGroupResInfo* pGroupResInfo,
-                           int32_t orderType, int32_t* rowCellOffset, SqlFunctionCtx* pCtx, int32_t numOfExprs) {
+                           int32_t* rowCellOffset, SqlFunctionCtx* pCtx, int32_t numOfExprs) {
   int32_t numOfRows = getNumOfTotalRes(pGroupResInfo);
-  int32_t numOfResult = pBlock->info.rows;  // there are already exists result rows
-
-  int32_t start = 0;
-  int32_t step = 1;
+  int32_t start = pGroupResInfo->index;
 
   // qDebug("QInfo:0x%"PRIx64" start to copy data from windowResInfo to output buf", GET_TASKID(pRuntimeEnv));
-  assert(orderType == TSDB_ORDER_ASC || orderType == TSDB_ORDER_DESC);
 
-  if (orderType == TSDB_ORDER_ASC) {
-    start = pGroupResInfo->index;
-  } else {  // desc order copy all data
-    start = numOfRows - pGroupResInfo->index - 1;
-  }
-
-  for (int32_t i = start; (i < numOfRows) && (i >= 0); i += step) {
+  for (int32_t i = start; i < numOfRows; i += 1) {
     SResKeyPos* pPos = taosArrayGetP(pGroupResInfo->pRows, i);
     SFilePage*  page = getBufPage(pBuf, pPos->pos.pageId);
 
@@ -2162,9 +2152,7 @@ int32_t doCopyToSDataBlock(SExecTaskInfo* taskInfo, SSDataBlock* pBlock, SExprIn
       continue;
     }
 
-    // TODO copy multiple rows?
-    int32_t numOfRowsToCopy = pRow->numOfRows;
-    if (numOfResult + numOfRowsToCopy >= pBlock->info.capacity) {
+    if (pBlock->info.rows + pRow->numOfRows > pBlock->info.capacity) {
       break;
     }
 
@@ -2195,7 +2183,6 @@ int32_t doCopyToSDataBlock(SExecTaskInfo* taskInfo, SSDataBlock* pBlock, SExprIn
     }
 
     releaseBufPage(pBuf, page);
-
     pBlock->info.rows += pRow->numOfRows;
     if (pBlock->info.rows >= pBlock->info.capacity) {  // output buffer is full
       break;
@@ -2223,8 +2210,7 @@ void doBuildResultDatablock(SOperatorInfo* pOperator, SOptrBasicInfo* pbInfo, SG
     return;
   }
 
-  int32_t orderType = TSDB_ORDER_ASC;
-  doCopyToSDataBlock(pTaskInfo, pBlock, pExprInfo, pBuf, pGroupResInfo, orderType, rowCellOffset, pCtx, numOfExprs);
+  doCopyToSDataBlock(pTaskInfo, pBlock, pExprInfo, pBuf, pGroupResInfo, rowCellOffset, pCtx, numOfExprs);
 
   // add condition (pBlock->info.rows >= 1) just to runtime happy
   blockDataUpdateTsWindow(pBlock);