diff --git a/source/libs/function/src/builtinsimpl.c b/source/libs/function/src/builtinsimpl.c
index 6e25655d3f..806b2a049d 100644
--- a/source/libs/function/src/builtinsimpl.c
+++ b/source/libs/function/src/builtinsimpl.c
@@ -67,8 +67,7 @@ typedef struct STopBotResItem {
 
 typedef struct STopBotRes {
   int32_t         maxSize;
-  int16_t         type;  // store the original input type, used in merge function
-  int32_t         numOfItems;
+  int16_t         type;
   STopBotResItem* pItems;
 } STopBotRes;
 
@@ -2944,50 +2943,6 @@ int32_t bottomFunction(SqlFunctionCtx* pCtx) {
   return TSDB_CODE_SUCCESS;
 }
 
-static void topBotTransferInfo(SqlFunctionCtx* pCtx, STopBotRes* pInput, bool isTopQuery) {
-  for (int32_t i = 0; i < pInput->numOfItems; i++) {
-    addResult(pCtx, &pInput->pItems[i], pInput->type, isTopQuery);
-  }
-}
-
-int32_t topFunctionMerge(SqlFunctionCtx* pCtx) {
-  SResultRowEntryInfo*  pEntryInfo = GET_RES_INFO(pCtx);
-  SInputColumnInfoData* pInput = &pCtx->input;
-  SColumnInfoData*      pCol = pInput->pData[0];
-  ASSERT(pCol->info.type == TSDB_DATA_TYPE_BINARY);
-
-  int32_t     start = pInput->startRowIndex;
-  char*       data = colDataGetData(pCol, start);
-  STopBotRes* pInputInfo = (STopBotRes*)varDataVal(data);
-  STopBotRes* pInfo = GET_ROWCELL_INTERBUF(GET_RES_INFO(pCtx));
-
-  pInfo->maxSize = pInputInfo->maxSize;
-  pInfo->type = pInputInfo->type;
-  topBotTransferInfo(pCtx, pInputInfo, true);
-  SET_VAL(GET_RES_INFO(pCtx), pEntryInfo->numOfRes, pEntryInfo->numOfRes);
-
-  return TSDB_CODE_SUCCESS;
-}
-
-int32_t bottomFunctionMerge(SqlFunctionCtx* pCtx) {
-  SResultRowEntryInfo*  pEntryInfo = GET_RES_INFO(pCtx);
-  SInputColumnInfoData* pInput = &pCtx->input;
-  SColumnInfoData*      pCol = pInput->pData[0];
-  ASSERT(pCol->info.type == TSDB_DATA_TYPE_BINARY);
-
-  int32_t     start = pInput->startRowIndex;
-  char*       data = colDataGetData(pCol, start);
-  STopBotRes* pInputInfo = (STopBotRes*)varDataVal(data);
-  STopBotRes* pInfo = GET_ROWCELL_INTERBUF(GET_RES_INFO(pCtx));
-
-  pInfo->maxSize = pInputInfo->maxSize;
-  pInfo->type = pInputInfo->type;
-  topBotTransferInfo(pCtx, pInputInfo, false);
-  SET_VAL(GET_RES_INFO(pCtx), pEntryInfo->numOfRes, pEntryInfo->numOfRes);
-
-  return TSDB_CODE_SUCCESS;
-}
-
 static int32_t topBotResComparFn(const void* p1, const void* p2, const void* param) {
   uint16_t type = *(uint16_t*)param;
 
@@ -3036,8 +2991,6 @@ void doAddIntoResult(SqlFunctionCtx* pCtx, void* pData, int32_t rowIndex, SSData
 
     // allocate the buffer and keep the data of this row into the new allocated buffer
     pEntryInfo->numOfRes++;
-    // accumulate number of items for each vgroup, this info is needed for merge
-    pRes->numOfItems++;
     taosheapsort((void*)pItems, sizeof(STopBotResItem), pEntryInfo->numOfRes, (const void*)&type, topBotResComparFn,
                  !isTopQuery);
   } else {  // replace the minimum value in the result
@@ -3177,8 +3130,6 @@ void addResult(SqlFunctionCtx* pCtx, STopBotResItem* pSourceItem, int16_t type,
     pItem->tuplePos.pageId = -1;
     replaceTupleData(&pItem->tuplePos, &pSourceItem->tuplePos);
     pEntryInfo->numOfRes++;
-    // accumulate number of items for each vgroup, this info is needed for merge
-    pRes->numOfItems++;
     taosheapsort((void*)pItems, sizeof(STopBotResItem), pEntryInfo->numOfRes, (const void*)&type, topBotResComparFn,
                  !isTopQuery);
   } else {  // replace the minimum value in the result