Adding upstream version 6.0.4.

Signed-off-by: Daniel Baumann <daniel@debian.org>

tests/test_transforms.py

@@ -0,0 +1,16 @@
+import unittest
+
+from sqlglot import parse_one
+from sqlglot.transforms import unalias_group
+
+
+class TestTime(unittest.TestCase):
+    def validate(self, transform, sql, target):
+        self.assertEqual(parse_one(sql).transform(transform).sql(), target)
+
+    def test_unalias_group(self):
+        self.validate(
+            unalias_group,
+            "SELECT a, b AS b, c AS c, 4 FROM x GROUP BY a, b, x.c, 4",
+            "SELECT a, b AS b, c AS c, 4 FROM x GROUP BY a, 2, x.c, 4",
+        )