morrySnow commented on code in PR #27750:
URL: https://github.com/apache/doris/pull/27750#discussion_r1408896579


##########
fe/fe-core/src/main/java/org/apache/doris/analysis/NullLiteral.java:
##########
@@ -101,6 +101,11 @@ public String getStringValue() {
         return "NULL";
     }
 
+    @Override
+    public String getStringValueInFe() {
+        return null;

Review Comment:
   add a simple case just select all type primitive type in select list. such as
   ```sql
   SELECT 1, 1.1, cast(1.1 as double), null, ....
   ```



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