diff --git a/source/libs/function/inc/builtinsimpl.h b/source/libs/function/inc/builtinsimpl.h
index f3ebb2359b..7615584f8c 100644
--- a/source/libs/function/inc/builtinsimpl.h
+++ b/source/libs/function/inc/builtinsimpl.h
@@ -254,7 +254,6 @@ bool    getGroupKeyFuncEnv(SFunctionNode* pFunc, SFuncExecEnv* pEnv);
 int32_t groupKeyFunction(SqlFunctionCtx* pCtx);
 int32_t groupKeyFinalize(SqlFunctionCtx* pCtx, SSDataBlock* pBlock);
 int32_t groupKeyCombine(SqlFunctionCtx* pDestCtx, SqlFunctionCtx* pSourceCtx);
-int32_t selectValueFunciton(SqlFunctionCtx* pCtx);
 
 #ifdef __cplusplus
 }
diff --git a/source/libs/function/src/builtinsimpl.c b/source/libs/function/src/builtinsimpl.c
index 7e2f631816..aab5a52776 100644
--- a/source/libs/function/src/builtinsimpl.c
+++ b/source/libs/function/src/builtinsimpl.c
@@ -6650,41 +6650,6 @@ _group_key_over:
   return TSDB_CODE_SUCCESS;
 }
 
-int32_t selectValueFunciton(SqlFunctionCtx* pCtx) {
-  SResultRowEntryInfo* pResInfo = GET_RES_INFO(pCtx);
-  SGroupKeyInfo*       pInfo = GET_ROWCELL_INTERBUF(pResInfo);
-
-  SInputColumnInfoData* pInput = &pCtx->input;
-  SColumnInfoData*      pInputCol = pInput->pData[0];
-
-  int32_t startIndex = pInput->startRowIndex;
-
-  // escape rest of data blocks to avoid first entry to be overwritten.
-  if (pInfo->hasResult) {
-    goto _group_key_over;
-  }
-
-  if (pInputCol->pData == NULL || colDataIsNull_s(pInputCol, startIndex)) {
-    pInfo->isNull = true;
-    pInfo->hasResult = true;
-    goto _group_key_over;
-  }
-
-  char* data = colDataGetData(pInputCol, startIndex);
-  if (IS_VAR_DATA_TYPE(pInputCol->info.type)) {
-    memcpy(pInfo->data, data,
-           (pInputCol->info.type == TSDB_DATA_TYPE_JSON) ? getJsonValueLen(data) : varDataTLen(data));
-  } else {
-    memcpy(pInfo->data, data, pInputCol->info.bytes);
-  }
-  pInfo->hasResult = true;
-
-_group_key_over:
-
-  SET_VAL(pResInfo, 1, 1);
-  return TSDB_CODE_SUCCESS;
-}
-
 int32_t groupKeyFinalize(SqlFunctionCtx* pCtx, SSDataBlock* pBlock) {
   int32_t          slotId = pCtx->pExpr->base.resSchema.slotId;
   SColumnInfoData* pCol = taosArrayGet(pBlock->pDataBlock, slotId);