diff --git a/include/libs/function/function.h b/include/libs/function/function.h
index 0580f3acba..094ce80106 100644
--- a/include/libs/function/function.h
+++ b/include/libs/function/function.h
@@ -207,7 +207,7 @@ typedef struct SqlFunctionCtx {
   struct SSDataBlock    *pSrcBlock;
   int32_t                curBufPage;
 
-  char*           udfName[TSDB_FUNC_NAME_LEN];
+  char                   udfName[TSDB_FUNC_NAME_LEN];
 } SqlFunctionCtx;
 
 enum {
diff --git a/include/libs/function/functionMgt.h b/include/libs/function/functionMgt.h
index 126a2ccf99..0572262bfc 100644
--- a/include/libs/function/functionMgt.h
+++ b/include/libs/function/functionMgt.h
@@ -162,6 +162,7 @@ EFuncDataRequired fmFuncDataRequired(SFunctionNode* pFunc, STimeWindow* pTimeWin
 
 int32_t fmGetFuncExecFuncs(int32_t funcId, SFuncExecFuncs* pFpSet);
 int32_t fmGetScalarFuncExecFuncs(int32_t funcId, SScalarFuncExecFuncs* pFpSet);
+int32_t fmGetUdafExecFuncs(int32_t funcId, SFuncExecFuncs* pFpSet);
 
 #ifdef __cplusplus
 }
diff --git a/include/libs/function/tudf.h b/include/libs/function/tudf.h
index 985bf6fa6f..e49f5cac45 100644
--- a/include/libs/function/tudf.h
+++ b/include/libs/function/tudf.h
@@ -140,7 +140,7 @@ typedef int32_t (*TUdfFreeUdfColumnFunc)(SUdfColumn* column);
 typedef int32_t (*TUdfScalarProcFunc)(SUdfDataBlock* block, SUdfColumn *resultCol);
 
 typedef int32_t (*TUdfAggStartFunc)(SUdfInterBuf *buf);
-typedef int32_t (*TUdfAggProcessFunc)(SUdfDataBlock* block, SUdfInterBuf *interBuf);
+typedef int32_t (*TUdfAggProcessFunc)(SUdfDataBlock* block, SUdfInterBuf *interBuf, SUdfInterBuf *newInterBuf);
 typedef int32_t (*TUdfAggFinishFunc)(SUdfInterBuf* buf, SUdfInterBuf *resultData);
 
 
diff --git a/source/libs/executor/src/executorimpl.c b/source/libs/executor/src/executorimpl.c
index f1995b723d..943a016c27 100644
--- a/source/libs/executor/src/executorimpl.c
+++ b/source/libs/executor/src/executorimpl.c
@@ -1897,7 +1897,14 @@ SqlFunctionCtx* createSqlFunctionCtx(SExprInfo* pExprInfo, int32_t numOfOutput,
       pCtx->functionId = pExpr->pExpr->_function.pFunctNode->funcId;
 
       if (fmIsAggFunc(pCtx->functionId) || fmIsNonstandardSQLFunc(pCtx->functionId)) {
-        fmGetFuncExecFuncs(pCtx->functionId, &pCtx->fpSet);
+        bool isUdaf = fmIsUserDefinedFunc(pCtx->functionId);
+        if (!isUdaf) {
+          fmGetFuncExecFuncs(pCtx->functionId, &pCtx->fpSet);
+        } else {
+          char *udfName = pExpr->pExpr->_function.pFunctNode->functionName;
+          strncpy(pCtx->udfName, udfName, strlen(udfName));
+          fmGetUdafExecFuncs(pCtx->functionId, &pCtx->fpSet);
+        }
         pCtx->fpSet.getEnv(pExpr->pExpr->_function.pFunctNode, &env);
       } else {
         fmGetScalarFuncExecFuncs(pCtx->functionId, &pCtx->sfp);
diff --git a/source/libs/function/src/functionMgt.c b/source/libs/function/src/functionMgt.c
index 585eb57a56..0113da94eb 100644
--- a/source/libs/function/src/functionMgt.c
+++ b/source/libs/function/src/functionMgt.c
@@ -124,7 +124,10 @@ int32_t fmGetFuncExecFuncs(int32_t funcId, SFuncExecFuncs* pFpSet) {
   return TSDB_CODE_SUCCESS;
 }
 
-int32_t fmGetUdafExecFuncs(SFuncExecFuncs* pFpSet) {
+int32_t fmGetUdafExecFuncs(int32_t funcId, SFuncExecFuncs* pFpSet) {
+  if (!fmIsUserDefinedFunc(funcId)) {
+    return TSDB_CODE_FAILED;
+  }
   pFpSet->getEnv = udfAggGetEnv;
   pFpSet->init = udfAggInit;
   pFpSet->process = udfAggProcess;
diff --git a/source/libs/function/src/udfd.c b/source/libs/function/src/udfd.c
index 896ebd3763..ae24a832c8 100644
--- a/source/libs/function/src/udfd.c
+++ b/source/libs/function/src/udfd.c
@@ -232,7 +232,7 @@ void udfdProcessRequest(uv_work_t *req) {
           SUdfInterBuf outBuf = {.buf = taosMemoryMalloc(udf->bufSize),
                                  .bufLen= udf->bufSize,
                                  .numOfResult = 0};
-          udf->aggProcFunc(&input, &outBuf);
+          udf->aggProcFunc(&input, &call->interBuf, &outBuf);
           subRsp->resultBuf = outBuf;
 
           break;
diff --git a/source/libs/function/test/udf2.c b/source/libs/function/test/udf2.c
index 250c20ba88..83187c5855 100644
--- a/source/libs/function/test/udf2.c
+++ b/source/libs/function/test/udf2.c
@@ -24,7 +24,7 @@ int32_t udf2_start(SUdfInterBuf *buf) {
   return 0;
 }
 
-int32_t udf2(SUdfDataBlock* block, SUdfInterBuf *interBuf) {
+int32_t udf2(SUdfDataBlock* block, SUdfInterBuf *interBuf, SUdfInterBuf *newInterBuf) {
   int64_t sumSquares = *(int64_t*)interBuf->buf;
   for (int32_t i = 0; i < block->numOfCols; ++i) {
     for (int32_t j = 0; j < block->numOfRows; ++i) {
@@ -35,10 +35,10 @@ int32_t udf2(SUdfDataBlock* block, SUdfInterBuf *interBuf) {
     }
   }
 
-  *(int64_t*)interBuf = sumSquares;
-  interBuf->bufLen = sizeof(int64_t);
+  *(int64_t*)newInterBuf = sumSquares;
+  newInterBuf->bufLen = sizeof(int64_t);
   //TODO: if all null value, numOfResult = 0;
-  interBuf->numOfResult = 1;
+  newInterBuf->numOfResult = 1;
   return 0;
 }