Allow bare columns in GROUPING SETS expressions (#2288)

Author: funcpp

src/parser/mod.rs

@@ -2592,7 +2592,7 @@ impl<'a> Parser<'a> {
         if self.dialect.supports_group_by_expr() {
             if self.parse_keywords(&[Keyword::GROUPING, Keyword::SETS]) {
                 self.expect_token(&Token::LParen)?;
-                let result = self.parse_comma_separated(|p| p.parse_tuple(false, true))?;
+                let result = self.parse_comma_separated(|p| p.parse_tuple(true, true))?;
                 self.expect_token(&Token::RParen)?;
                 Ok(Expr::GroupingSets(result))
             } else if self.parse_keyword(Keyword::CUBE) {

tests/sqlparser_common.rs

@@ -13109,6 +13109,19 @@ fn test_group_by_grouping_sets() {
     );
 }
 
+#[test]
+fn test_group_by_grouping_sets_bare_columns() {
+    all_dialects_where(|d| d.supports_group_by_expr()).one_statement_parses_to(
+        "SELECT a, b FROM t GROUP BY GROUPING SETS (a, b, c)",
+        "SELECT a, b FROM t GROUP BY GROUPING SETS ((a), (b), (c))",
+    );
+
+    all_dialects_where(|d| d.supports_group_by_expr()).one_statement_parses_to(
+        "SELECT a, b FROM t GROUP BY GROUPING SETS ((a, b), c)",
+        "SELECT a, b FROM t GROUP BY GROUPING SETS ((a, b), (c))",
+    );
+}
+
 #[test]
 fn test_xmltable() {
     all_dialects()