finalize result buf location can be specified

source/libs/function/inc/builtinsimpl.h

@@ -25,6 +25,7 @@ extern "C" {
 
 bool functionSetup(SqlFunctionCtx *pCtx, SResultRowEntryInfo* pResultInfo);
 int32_t functionFinalize(SqlFunctionCtx* pCtx, SSDataBlock* pBlock);
+int32_t functionFinalizeWithResultBuf(SqlFunctionCtx* pCtx, SSDataBlock* pBlock, char* finalResult);
 
 EFuncDataRequired countDataRequired(SFunctionNode* pFunc, STimeWindow* pTimeWindow);
 bool getCountFuncEnv(struct SFunctionNode* pFunc, SFuncExecEnv* pEnv);

source/libs/function/src/builtinsimpl.c

@@ -139,6 +139,20 @@ int32_t functionFinalize(SqlFunctionCtx* pCtx, SSDataBlock* pBlock) {
   return pResInfo->numOfRes;
 }
 
+int32_t functionFinalizeWithResultBuf(SqlFunctionCtx* pCtx, SSDataBlock* pBlock, char* finalResult) {
+  int32_t slotId = pCtx->pExpr->base.resSchema.slotId;
+  SColumnInfoData* pCol = taosArrayGet(pBlock->pDataBlock, slotId);
+
+  SResultRowEntryInfo* pResInfo = GET_RES_INFO(pCtx);
+  pResInfo->isNullRes = (pResInfo->numOfRes == 0)? 1:0;
+  cleanupResultRowEntry(pResInfo);
+
+  char* in = finalResult;
+  colDataAppend(pCol, pBlock->info.rows, in, pResInfo->isNullRes);
+
+  return pResInfo->numOfRes;
+}
+
 EFuncDataRequired countDataRequired(SFunctionNode* pFunc, STimeWindow* pTimeWindow) {
   SNode* pParam = nodesListGetNode(pFunc->pParameterList, 0);
   if (QUERY_NODE_COLUMN == nodeType(pParam) && PRIMARYKEY_TIMESTAMP_COL_ID == ((SColumnNode*)pParam)->colId) {

source/libs/function/src/tudf.c

@@ -1332,7 +1332,5 @@ int32_t udfAggFinalize(struct SqlFunctionCtx *pCtx, SSDataBlock* pBlock) {
   if (resultBuf.numOfResult == 1) {
     GET_RES_INFO(pCtx)->numOfRes = 1;
   }
-  functionFinalize(pCtx, pBlock);
-  
-  return 0;
+  return functionFinalizeWithResultBuf(pCtx, pBlock, udfRes->finalResBuf);
 }
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