two version of R2R are here HEAD master

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diff --git a/.venv/lib/python3.12/site-packages/sqlalchemy/testing/suite/test_deprecations.py b/.venv/lib/python3.12/site-packages/sqlalchemy/testing/suite/test_deprecations.py
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+# testing/suite/test_deprecations.py
+# Copyright (C) 2005-2025 the SQLAlchemy authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of SQLAlchemy and is released under
+# the MIT License: https://www.opensource.org/licenses/mit-license.php
+# mypy: ignore-errors
+
+from .. import fixtures
+from ..assertions import eq_
+from ..schema import Column
+from ..schema import Table
+from ... import Integer
+from ... import select
+from ... import testing
+from ... import union
+
+
+class DeprecatedCompoundSelectTest(fixtures.TablesTest):
+    __backend__ = True
+
+    @classmethod
+    def define_tables(cls, metadata):
+        Table(
+            "some_table",
+            metadata,
+            Column("id", Integer, primary_key=True),
+            Column("x", Integer),
+            Column("y", Integer),
+        )
+
+    @classmethod
+    def insert_data(cls, connection):
+        connection.execute(
+            cls.tables.some_table.insert(),
+            [
+                {"id": 1, "x": 1, "y": 2},
+                {"id": 2, "x": 2, "y": 3},
+                {"id": 3, "x": 3, "y": 4},
+                {"id": 4, "x": 4, "y": 5},
+            ],
+        )
+
+    def _assert_result(self, conn, select, result, params=()):
+        eq_(conn.execute(select, params).fetchall(), result)
+
+    def test_plain_union(self, connection):
+        table = self.tables.some_table
+        s1 = select(table).where(table.c.id == 2)
+        s2 = select(table).where(table.c.id == 3)
+
+        u1 = union(s1, s2)
+        with testing.expect_deprecated(
+            "The SelectBase.c and SelectBase.columns "
+            "attributes are deprecated"
+        ):
+            self._assert_result(
+                connection, u1.order_by(u1.c.id), [(2, 2, 3), (3, 3, 4)]
+            )
+
+    # note we've had to remove one use case entirely, which is this
+    # one.   the Select gets its FROMS from the WHERE clause and the
+    # columns clause, but not the ORDER BY, which means the old ".c" system
+    # allowed you to "order_by(s.c.foo)" to get an unnamed column in the
+    # ORDER BY without adding the SELECT into the FROM and breaking the
+    # query.  Users will have to adjust for this use case if they were doing
+    # it before.
+    def _dont_test_select_from_plain_union(self, connection):
+        table = self.tables.some_table
+        s1 = select(table).where(table.c.id == 2)
+        s2 = select(table).where(table.c.id == 3)
+
+        u1 = union(s1, s2).alias().select()
+        with testing.expect_deprecated(
+            "The SelectBase.c and SelectBase.columns "
+            "attributes are deprecated"
+        ):
+            self._assert_result(
+                connection, u1.order_by(u1.c.id), [(2, 2, 3), (3, 3, 4)]
+            )
+
+    @testing.requires.order_by_col_from_union
+    @testing.requires.parens_in_union_contained_select_w_limit_offset
+    def test_limit_offset_selectable_in_unions(self, connection):
+        table = self.tables.some_table
+        s1 = select(table).where(table.c.id == 2).limit(1).order_by(table.c.id)
+        s2 = select(table).where(table.c.id == 3).limit(1).order_by(table.c.id)
+
+        u1 = union(s1, s2).limit(2)
+        with testing.expect_deprecated(
+            "The SelectBase.c and SelectBase.columns "
+            "attributes are deprecated"
+        ):
+            self._assert_result(
+                connection, u1.order_by(u1.c.id), [(2, 2, 3), (3, 3, 4)]
+            )
+
+    @testing.requires.parens_in_union_contained_select_wo_limit_offset
+    def test_order_by_selectable_in_unions(self, connection):
+        table = self.tables.some_table
+        s1 = select(table).where(table.c.id == 2).order_by(table.c.id)
+        s2 = select(table).where(table.c.id == 3).order_by(table.c.id)
+
+        u1 = union(s1, s2).limit(2)
+        with testing.expect_deprecated(
+            "The SelectBase.c and SelectBase.columns "
+            "attributes are deprecated"
+        ):
+            self._assert_result(
+                connection, u1.order_by(u1.c.id), [(2, 2, 3), (3, 3, 4)]
+            )
+
+    def test_distinct_selectable_in_unions(self, connection):
+        table = self.tables.some_table
+        s1 = select(table).where(table.c.id == 2).distinct()
+        s2 = select(table).where(table.c.id == 3).distinct()
+
+        u1 = union(s1, s2).limit(2)
+        with testing.expect_deprecated(
+            "The SelectBase.c and SelectBase.columns "
+            "attributes are deprecated"
+        ):
+            self._assert_result(
+                connection, u1.order_by(u1.c.id), [(2, 2, 3), (3, 3, 4)]
+            )
+
+    def test_limit_offset_aliased_selectable_in_unions(self, connection):
+        table = self.tables.some_table
+        s1 = (
+            select(table)
+            .where(table.c.id == 2)
+            .limit(1)
+            .order_by(table.c.id)
+            .alias()
+            .select()
+        )
+        s2 = (
+            select(table)
+            .where(table.c.id == 3)
+            .limit(1)
+            .order_by(table.c.id)
+            .alias()
+            .select()
+        )
+
+        u1 = union(s1, s2).limit(2)
+        with testing.expect_deprecated(
+            "The SelectBase.c and SelectBase.columns "
+            "attributes are deprecated"
+        ):
+            self._assert_result(
+                connection, u1.order_by(u1.c.id), [(2, 2, 3), (3, 3, 4)]
+            )