diff --git a/source/libs/function/src/builtins.c b/source/libs/function/src/builtins.c
index eac11558cb..734136b296 100644
--- a/source/libs/function/src/builtins.c
+++ b/source/libs/function/src/builtins.c
@@ -242,8 +242,7 @@ static int32_t translateFirstLast(SFunctionNode* pFunc, char* pErrBuf, int32_t l
                            "The parameters of first/last can only be columns");
   }
 
-  uint8_t paraType = ((SExprNode*)pPara)->resType.type;
-  pFunc->node.resType = (SDataType){.bytes = tDataTypes[paraType].bytes, .type = paraType};
+  pFunc->node.resType = ((SExprNode*)pPara)->resType;
   return TSDB_CODE_SUCCESS;
 }