[PostgreSQL] Fix set operation precedence (#3567)

Now the origin select_cause is redundant since simple_select matches select_with_parens
antlr · Jul 19, 2023 · 4cfe10d · 4cfe10d
1 parent 5b6a6dd
commit 4cfe10d
Showing 1 changed file with 10 additions and 18 deletions.
diff --git a/sql/postgresql/PostgreSQLParser.g4 b/sql/postgresql/PostgreSQLParser.g4
@@ -2902,33 +2902,25 @@ select_no_parens
    ;
 
 select_clause
-   : simple_select
-   | select_with_parens
+   : simple_select_intersect ((UNION | EXCEPT) all_or_distinct simple_select_intersect)*
    ;
 
-simple_select
+simple_select_intersect
+    : simple_select_pramary (INTERSECT all_or_distinct simple_select_pramary)*
+    ;
+
+simple_select_pramary
    : ( SELECT (opt_all_clause into_clause opt_target_list | distinct_clause target_list)
            into_clause
            from_clause
            where_clause
            group_clause
            having_clause
            window_clause
-       | values_clause
-       | TABLE relation_expr
-       | select_with_parens set_operator_with_all_or_distinct (simple_select | select_with_parens)
-     )
-        (set_operator_with_all_or_distinct (simple_select | select_with_parens))*
-   ;
-
-set_operator
-   : UNION # union
-   | INTERSECT # intersect
-   | EXCEPT # except
-   ;
-
-set_operator_with_all_or_distinct
-   : set_operator all_or_distinct
+    )
+   | values_clause
+   | TABLE relation_expr
+   | select_with_parens
    ;
 
 with_clause