diff --git a/source/libs/executor/src/executorimpl.c b/source/libs/executor/src/executorimpl.c
index 2f7be5e762..f04ab24fe7 100644
--- a/source/libs/executor/src/executorimpl.c
+++ b/source/libs/executor/src/executorimpl.c
@@ -897,6 +897,7 @@ int32_t projectApplyFunctions(SExprInfo* pExpr, SSDataBlock* pResult, SSDataBloc
       scalarCalculate(pExpr[k].pExpr->_optrRoot.pRootNode, pBlockList, &dest);
 
       int32_t startOffset = createNewColModel ? 0 : pResult->info.rows;
+      colInfoDataEnsureCapacity(pResColData, startOffset, pResult->info.capacity);
       colDataMergeCol(pResColData, startOffset, &pResult->info.capacity, &idata, dest.numOfRows);
 
       numOfRows = dest.numOfRows;
@@ -936,6 +937,7 @@ int32_t projectApplyFunctions(SExprInfo* pExpr, SSDataBlock* pResult, SSDataBloc
         }
 
         int32_t startOffset = createNewColModel ? 0 : pResult->info.rows;
+        colInfoDataEnsureCapacity(pResColData, startOffset, pResult->info.capacity);
         colDataMergeCol(pResColData, startOffset, &pResult->info.capacity, &idata, dest.numOfRows);
 
         numOfRows = dest.numOfRows;
diff --git a/source/libs/function/test/udf2.c b/source/libs/function/test/udf2.c
index ba39b09f56..6410af2a4b 100644
--- a/source/libs/function/test/udf2.c
+++ b/source/libs/function/test/udf2.c
@@ -44,7 +44,7 @@ int32_t udf2(SUdfDataBlock* block, SUdfInterBuf *interBuf, SUdfInterBuf *newInte
         case TSDB_DATA_TYPE_INT: {
           char* cell = udfColDataGetData(col, j);
           int32_t num = *(int32_t*)cell;
-          sumSquares += num * num;
+          sumSquares += (double)num * num;
           break;
         }
         case TSDB_DATA_TYPE_DOUBLE: {