diff --git a/source/libs/function/src/builtins.c b/source/libs/function/src/builtins.c
index 522ee09b3cac7e4865be72ab381ff6853bf1301d..ee3eaadf2c8b91192dd32e6d71b6aba0aa61183b 100644
--- a/source/libs/function/src/builtins.c
+++ b/source/libs/function/src/builtins.c
@@ -419,7 +419,7 @@ static int32_t translateTopBot(SFunctionNode* pFunc, char* pErrBuf, int32_t len)
   return TSDB_CODE_SUCCESS;
 }
 
-int32_t topCreateMergePara(SNodeList* pRawParameters, SNode* pPartialRes, SNodeList** pParameters) {
+int32_t topBotCreateMergePara(SNodeList* pRawParameters, SNode* pPartialRes, SNodeList** pParameters) {
   int32_t code = nodesListMakeAppend(pParameters, pPartialRes);
   if (TSDB_CODE_SUCCESS == code) {
     code = nodesListStrictAppend(*pParameters, nodesCloneNode(nodesListGetNode(pRawParameters, 1)));
@@ -427,65 +427,6 @@ int32_t topCreateMergePara(SNodeList* pRawParameters, SNode* pPartialRes, SNodeL
   return TSDB_CODE_SUCCESS;
 }
 
-static int32_t translateTopBotImpl(SFunctionNode* pFunc, char* pErrBuf, int32_t len, bool isPartial) {
-  int32_t numOfParams = LIST_LENGTH(pFunc->pParameterList);
-
-  if (isPartial) {
-    if (2 != numOfParams) {
-      return invaildFuncParaNumErrMsg(pErrBuf, len, pFunc->functionName);
-    }
-
-    uint8_t para1Type = ((SExprNode*)nodesListGetNode(pFunc->pParameterList, 0))->resType.type;
-    uint8_t para2Type = ((SExprNode*)nodesListGetNode(pFunc->pParameterList, 1))->resType.type;
-    if (!IS_NUMERIC_TYPE(para1Type) || !IS_INTEGER_TYPE(para2Type)) {
-      return invaildFuncParaTypeErrMsg(pErrBuf, len, pFunc->functionName);
-    }
-
-    // param1
-    SNode* pParamNode1 = nodesListGetNode(pFunc->pParameterList, 1);
-    if (nodeType(pParamNode1) != QUERY_NODE_VALUE) {
-      return invaildFuncParaTypeErrMsg(pErrBuf, len, pFunc->functionName);
-    }
-
-    SValueNode* pValue = (SValueNode*)pParamNode1;
-    if (pValue->node.resType.type != TSDB_DATA_TYPE_BIGINT) {
-      return invaildFuncParaTypeErrMsg(pErrBuf, len, pFunc->functionName);
-    }
-
-    if (pValue->datum.i < 1 || pValue->datum.i > 100) {
-      return invaildFuncParaValueErrMsg(pErrBuf, len, pFunc->functionName);
-    }
-
-    pValue->notReserved = true;
-
-    // set result type
-    pFunc->node.resType =
-        (SDataType){.bytes = getTopBotInfoSize(pValue->datum.i) + VARSTR_HEADER_SIZE, .type = TSDB_DATA_TYPE_BINARY};
-  } else {
-    if (1 != numOfParams) {
-      return invaildFuncParaNumErrMsg(pErrBuf, len, pFunc->functionName);
-    }
-
-    uint8_t para1Type = ((SExprNode*)nodesListGetNode(pFunc->pParameterList, 0))->resType.type;
-    if (TSDB_DATA_TYPE_BINARY != para1Type) {
-      return invaildFuncParaTypeErrMsg(pErrBuf, len, pFunc->functionName);
-    }
-
-    // Do nothing. We can only access output of partial functions as input,
-    // so original input type cannot be obtained, resType will be set same
-    // as original function input type after merge function created.
-  }
-  return TSDB_CODE_SUCCESS;
-}
-
-static int32_t translateTopBotPartial(SFunctionNode* pFunc, char* pErrBuf, int32_t len) {
-  return translateTopBotImpl(pFunc, pErrBuf, len, true);
-}
-
-static int32_t translateTopBotMerge(SFunctionNode* pFunc, char* pErrBuf, int32_t len) {
-  return translateTopBotImpl(pFunc, pErrBuf, len, false);
-}
-
 static int32_t translateSpread(SFunctionNode* pFunc, char* pErrBuf, int32_t len) {
   if (1 != LIST_LENGTH(pFunc->pParameterList)) {
     return invaildFuncParaNumErrMsg(pErrBuf, len, pFunc->functionName);
@@ -1735,31 +1676,9 @@ const SBuiltinFuncDefinition funcMgtBuiltins[] = {
     .processFunc  = topFunction,
     .finalizeFunc = topBotFinalize,
     .combineFunc  = topCombine,
-    .pPartialFunc = "_top_partial",
-    .pMergeFunc   = "_top_merge",
-    // .createMergeParaFuc = topCreateMergePara
-  },
-  {
-    .name = "_top_partial",
-    .type = FUNCTION_TYPE_TOP_PARTIAL,
-    .classification = FUNC_MGT_AGG_FUNC | FUNC_MGT_SELECT_FUNC | FUNC_MGT_INDEFINITE_ROWS_FUNC,
-    .translateFunc = translateTopBotPartial,
-    .getEnvFunc   = getTopBotFuncEnv,
-    .initFunc     = topBotFunctionSetup,
-    .processFunc  = topFunction,
-    .finalizeFunc = topBotPartialFinalize,
-    .combineFunc  = topCombine,
-  },
-  {
-    .name = "_top_merge",
-    .type = FUNCTION_TYPE_TOP_MERGE,
-    .classification = FUNC_MGT_AGG_FUNC | FUNC_MGT_SELECT_FUNC | FUNC_MGT_INDEFINITE_ROWS_FUNC,
-    .translateFunc = translateTopBotMerge,
-    .getEnvFunc   = getTopBotMergeFuncEnv,
-    .initFunc     = functionSetup,
-    .processFunc  = topFunctionMerge,
-    .finalizeFunc = topBotMergeFinalize,
-    .combineFunc  = topCombine,
+    .pPartialFunc = "top",
+    .pMergeFunc   = "top",
+    .createMergeParaFuc = topBotCreateMergePara
   },
   {
     .name = "bottom",
@@ -1771,30 +1690,9 @@ const SBuiltinFuncDefinition funcMgtBuiltins[] = {
     .processFunc  = bottomFunction,
     .finalizeFunc = topBotFinalize,
     .combineFunc  = bottomCombine,
-    .pPartialFunc = "_bottom_partial",
-    .pMergeFunc   = "_bottom_merge"
-  },
-  {
-    .name = "_bottom_partial",
-    .type = FUNCTION_TYPE_BOTTOM_PARTIAL,
-    .classification = FUNC_MGT_AGG_FUNC | FUNC_MGT_SELECT_FUNC | FUNC_MGT_INDEFINITE_ROWS_FUNC,
-    .translateFunc = translateTopBotPartial,
-    .getEnvFunc   = getTopBotFuncEnv,
-    .initFunc     = topBotFunctionSetup,
-    .processFunc  = bottomFunction,
-    .finalizeFunc = topBotPartialFinalize,
-    .combineFunc  = bottomCombine,
-  },
-  {
-    .name = "_bottom_merge",
-    .type = FUNCTION_TYPE_BOTTOM_MERGE,
-    .classification = FUNC_MGT_AGG_FUNC | FUNC_MGT_SELECT_FUNC | FUNC_MGT_INDEFINITE_ROWS_FUNC,
-    .translateFunc = translateTopBotMerge,
-    .getEnvFunc   = getTopBotMergeFuncEnv,
-    .initFunc     = functionSetup,
-    .processFunc  = bottomFunctionMerge,
-    .finalizeFunc = topBotMergeFinalize,
-    .combineFunc  = bottomCombine,
+    .pPartialFunc = "bottom",
+    .pMergeFunc   = "bottom",
+    .createMergeParaFuc = topBotCreateMergePara
   },
   {
     .name = "spread",
@@ -2524,7 +2422,9 @@ const SBuiltinFuncDefinition funcMgtBuiltins[] = {
     .getEnvFunc   = getSelectivityFuncEnv,  // todo remove this function later.
     .initFunc     = functionSetup,
     .processFunc  = NULL,
-    .finalizeFunc = NULL
+    .finalizeFunc = NULL,
+    .pPartialFunc = "_select_value",
+    .pMergeFunc   = "_select_value"
   },
   {
     .name = "_block_dist",
diff --git a/source/libs/function/src/builtinsimpl.c b/source/libs/function/src/builtinsimpl.c
index 583e8bd3007371b9bbfa500ec2f0bee8765b7207..6e25655d3f744bab1f7ba2eed0c60a1df0bb3f42 100644
--- a/source/libs/function/src/builtinsimpl.c
+++ b/source/libs/function/src/builtinsimpl.c
@@ -2870,12 +2870,6 @@ bool getTopBotFuncEnv(SFunctionNode* pFunc, SFuncExecEnv* pEnv) {
   return true;
 }
 
-bool getTopBotMergeFuncEnv(SFunctionNode* pFunc, SFuncExecEnv* pEnv) {
-  // intermediate result is binary and length contains VAR header size
-  pEnv->calcMemSize = pFunc->node.resType.bytes;
-  return true;
-}
-
 bool topBotFunctionSetup(SqlFunctionCtx* pCtx, SResultRowEntryInfo* pResInfo) {
   if (!functionSetup(pCtx, pResInfo)) {
     return false;
@@ -3142,7 +3136,7 @@ void copyTupleData(SqlFunctionCtx* pCtx, int32_t rowIndex, const SSDataBlock* pS
   releaseBufPage(pCtx->pBuf, pPage);
 }
 
-int32_t topBotFinalizeImpl(SqlFunctionCtx* pCtx, SSDataBlock* pBlock, bool isMerge) {
+int32_t topBotFinalize(SqlFunctionCtx* pCtx, SSDataBlock* pBlock) {
   SResultRowEntryInfo* pEntryInfo = GET_RES_INFO(pCtx);
   STopBotRes*          pRes = GET_ROWCELL_INTERBUF(pEntryInfo);
 
@@ -3162,39 +3156,13 @@ int32_t topBotFinalizeImpl(SqlFunctionCtx* pCtx, SSDataBlock* pBlock, bool isMer
       colDataAppend(pCol, currentRow, (const char*)&pItem->v.i, false);
     }
 
-    if (!isMerge) {
-      setSelectivityValue(pCtx, pBlock, &pRes->pItems[i].tuplePos, currentRow);
-    }
+    setSelectivityValue(pCtx, pBlock, &pRes->pItems[i].tuplePos, currentRow);
     currentRow += 1;
   }
 
   return pEntryInfo->numOfRes;
 }
 
-int32_t topBotFinalize(SqlFunctionCtx* pCtx, SSDataBlock* pBlock) { return topBotFinalizeImpl(pCtx, pBlock, false); }
-
-int32_t topBotMergeFinalize(SqlFunctionCtx* pCtx, SSDataBlock* pBlock) {
-  return topBotFinalizeImpl(pCtx, pBlock, true);
-}
-
-int32_t topBotPartialFinalize(SqlFunctionCtx* pCtx, SSDataBlock* pBlock) {
-  SResultRowEntryInfo* pEntryInfo = GET_RES_INFO(pCtx);
-  STopBotRes*          pRes = GET_ROWCELL_INTERBUF(GET_RES_INFO(pCtx));
-  int32_t              resultBytes = getTopBotInfoSize(pRes->maxSize);
-  char*                res = taosMemoryCalloc(resultBytes + VARSTR_HEADER_SIZE, sizeof(char));
-
-  memcpy(varDataVal(res), pRes, resultBytes);
-  varDataSetLen(res, resultBytes);
-
-  int32_t          slotId = pCtx->pExpr->base.resSchema.slotId;
-  SColumnInfoData* pCol = taosArrayGet(pBlock->pDataBlock, slotId);
-
-  colDataAppend(pCol, pBlock->info.rows, res, false);
-
-  taosMemoryFree(res);
-  return 1;
-}
-
 void addResult(SqlFunctionCtx* pCtx, STopBotResItem* pSourceItem, int16_t type, bool isTopQuery) {
   SResultRowEntryInfo* pEntryInfo = GET_RES_INFO(pCtx);
   STopBotRes*          pRes = getTopBotOutputInfo(pCtx);
@@ -5362,4 +5330,4 @@ int32_t interpFunction(SqlFunctionCtx* pCtx) {
 #endif
 
   return TSDB_CODE_SUCCESS;
-}
\ No newline at end of file
+}