diff --git a/source/libs/executor/src/sortoperator.c b/source/libs/executor/src/sortoperator.c
index 3d8de1c1fd..79d5fe104f 100644
--- a/source/libs/executor/src/sortoperator.c
+++ b/source/libs/executor/src/sortoperator.c
@@ -120,6 +120,8 @@ SSDataBlock* getSortedBlockData(SSortHandle* pHandle, SSDataBlock* pDataBlock, i
   }
 
   if (p->info.rows > 0) {
+    blockDataEnsureCapacity(pDataBlock, capacity);
+
     // todo extract function to handle this
     int32_t numOfCols = taosArrayGetSize(pColMatchInfo);
     for (int32_t i = 0; i < numOfCols; ++i) {
@@ -132,7 +134,6 @@ SSDataBlock* getSortedBlockData(SSortHandle* pHandle, SSDataBlock* pDataBlock, i
     }
 
     pDataBlock->info.rows = p->info.rows;
-    pDataBlock->info.capacity = p->info.rows;
   }
 
   blockDataDestroy(p);
@@ -258,6 +259,7 @@ typedef struct SGroupSortOperatorInfo {
 SSDataBlock* getGroupSortedBlockData(SSortHandle* pHandle, SSDataBlock* pDataBlock, int32_t capacity,
                                      SArray* pColMatchInfo, SGroupSortOperatorInfo* pInfo) {
   blockDataCleanup(pDataBlock);
+  blockDataEnsureCapacity(pDataBlock, capacity);
 
   SSDataBlock* p = tsortGetSortedDataBlock(pHandle);
   if (p == NULL) {
@@ -571,7 +573,8 @@ SSDataBlock* getMultiwaySortedBlockData(SSortHandle* pHandle, SSDataBlock* pData
     }
   }
 
-  if (p->info.rows > 0) {
+  if (p->info.rows > 0) {// todo extract method
+    blockDataEnsureCapacity(pDataBlock, p->info.rows);
     int32_t numOfCols = taosArrayGetSize(pColMatchInfo);
     for (int32_t i = 0; i < numOfCols; ++i) {
       SColMatchInfo* pmInfo = taosArrayGet(pColMatchInfo, i);
@@ -583,7 +586,6 @@ SSDataBlock* getMultiwaySortedBlockData(SSortHandle* pHandle, SSDataBlock* pData
     }
 
     pDataBlock->info.rows = p->info.rows;
-    pDataBlock->info.capacity = p->info.rows;
     pDataBlock->info.groupId = pInfo->groupId;
   }
 
diff --git a/source/libs/function/src/tudf.c b/source/libs/function/src/tudf.c
index ea2a7567e4..aead5f2867 100644
--- a/source/libs/function/src/tudf.c
+++ b/source/libs/function/src/tudf.c
@@ -1081,7 +1081,6 @@ int32_t udfAggProcess(struct SqlFunctionCtx *pCtx) {
   int32_t start = pInput->startRowIndex;
   int32_t numOfRows = pInput->numOfRows;
 
-
   SSDataBlock* pTempBlock = createDataBlock();
   pTempBlock->info.rows = pInput->totalRows;
   pTempBlock->info.uid = pInput->uid;
diff --git a/tests/script/general/parser/udf.sim b/tests/script/general/parser/udf.sim
index c048a7c37a..4b767dbf60 100644
--- a/tests/script/general/parser/udf.sim
+++ b/tests/script/general/parser/udf.sim
@@ -44,6 +44,7 @@ endi
 sql create function n02 as '/tmp/normal' outputtype bool;
 sql show functions;
 if $rows != 1 then
+  print expect 1, actual $rows
   return -1
 endi
 
diff --git a/tests/script/tsim/query/udf.sim b/tests/script/tsim/query/udf.sim
index d9821a0495..4e95095172 100644
--- a/tests/script/tsim/query/udf.sim
+++ b/tests/script/tsim/query/udf.sim
@@ -44,6 +44,7 @@ endi
 
 sql select udf2(f) from t;
 if $rows != 1 then
+  print expect 1, actual $rows
   return -1
 endi
 if $data00 != 2.236067977 then