Fix(parser)!: expand single VALUES clause in CTE into a SELECT * (#4617)

* Fix(parser): expand single VALUES clause in CTE into a SELECT *

* Add an alias to the values clause

sqlglot/parser.py

@@ -3197,14 +3197,19 @@ def _parse_cte(self) -> t.Optional[exp.CTE]:
         else:
             materialized = None
 
-        return self.expression(
+        cte = self.expression(
             exp.CTE,
             this=self._parse_wrapped(self._parse_statement),
             alias=alias,
             materialized=materialized,
             comments=comments,
         )
 
+        if isinstance(cte.this, exp.Values):
+            cte.set("this", exp.select("*").from_(exp.alias_(cte.this, "_values", table=True)))
+
+        return cte
+
     def _parse_table_alias(
         self, alias_tokens: t.Optional[t.Collection[TokenType]] = None
     ) -> t.Optional[exp.TableAlias]:

tests/test_transpile.py

@@ -668,7 +668,7 @@ def test_with(self):
         )
         self.validate(
             "WITH A(filter) AS (VALUES 1, 2, 3) SELECT * FROM A WHERE filter >= 2",
-            "WITH A(filter) AS (VALUES (1), (2), (3)) SELECT * FROM A WHERE filter >= 2",
+            "WITH A(filter) AS (SELECT * FROM (VALUES (1), (2), (3)) AS _values) SELECT * FROM A WHERE filter >= 2",
             read="presto",
         )
         self.validate(