Use exprs for bundle __clause_element__

Fixed bug in :class:`.Bundle` construct where placing two columns of the
same name would be de-duplicated, when the :class:`.Bundle` were used as
part of the rendered SQL, such as in the ORDER BY or GROUP BY of the statement.

Change-Id: Ia528c9fbb399a6beb5ea7cdd3a8a83ad530f5831
Fixes: #4295

3 files changed, 48 insertions, 1 deletions

diff --git a/doc/build/changelog/unreleased_12/4295.rst b/doc/build/changelog/unreleased_12/4295.rst
new file mode 100644
index 000000000..acfc8a074
--- /dev/null
+++ b/doc/build/changelog/unreleased_12/4295.rst
@@ -0,0 +1,8 @@
+.. change::
+    :tags: bug, orm
+    :tickets: 4295
+
+    Fixed bug in :class:`.Bundle` construct where placing two columns of the
+    same name would be de-duplicated, when the :class:`.Bundle` were used as
+    part of the rendered SQL, such as in the ORDER BY or GROUP BY of the statement.
+
diff --git a/lib/sqlalchemy/orm/query.py b/lib/sqlalchemy/orm/query.py
index 98747c680..272fed3e2 100644
--- a/lib/sqlalchemy/orm/query.py
+++ b/lib/sqlalchemy/orm/query.py
@@ -3964,7 +3964,7 @@ class Bundle(InspectionAttr):
         return cloned
 
     def __clause_element__(self):
-        return expression.ClauseList(group=False, *self.c)
+        return expression.ClauseList(group=False, *self.exprs)
 
     @property
     def clauses(self):
diff --git a/test/orm/test_bundle.py b/test/orm/test_bundle.py
index 42a29d13c..cf1eb40c9 100644
--- a/test/orm/test_bundle.py
+++ b/test/orm/test_bundle.py
@@ -4,6 +4,7 @@ from sqlalchemy.orm import Bundle, Session
 from sqlalchemy.testing import AssertsCompiledSQL
 from sqlalchemy import Integer, select, ForeignKey, String, func
 from sqlalchemy.orm import mapper, relationship, aliased
+from sqlalchemy.sql.elements import ClauseList
 
 
 class BundleTest(fixtures.MappedTest, AssertsCompiledSQL):
@@ -54,6 +55,44 @@ class BundleTest(fixtures.MappedTest, AssertsCompiledSQL):
         ])
         sess.commit()
 
+    def test_same_named_col_clauselist(self):
+        Data, Other = self.classes("Data", "Other")
+        bundle = Bundle("pk", Data.id, Other.id)
+
+        self.assert_compile(
+            ClauseList(Data.id, Other.id),
+            "data.id, other.id"
+        )
+        self.assert_compile(
+            bundle.__clause_element__(),
+            "data.id, other.id"
+        )
+
+    def test_same_named_col_in_orderby(self):
+        Data, Other = self.classes("Data", "Other")
+        bundle = Bundle("pk", Data.id, Other.id)
+        sess = Session()
+
+        self.assert_compile(
+            sess.query(Data, Other).order_by(bundle),
+            "SELECT data.id AS data_id, data.d1 AS data_d1, "
+            "data.d2 AS data_d2, data.d3 AS data_d3, "
+            "other.id AS other_id, other.data_id AS other_data_id, "
+            "other.o1 AS other_o1 "
+            "FROM data, other ORDER BY data.id, other.id"
+        )
+
+    def test_same_named_col_in_fetch(self):
+        Data, Other = self.classes("Data", "Other")
+        bundle = Bundle("pk", Data.id, Other.id)
+        sess = Session()
+
+        eq_(
+            sess.query(bundle).filter(
+                Data.id == Other.id).filter(Data.id < 3).all(),
+            [((1, 1),), ((2, 2),)]
+        )
+
     def test_c_attr(self):
         Data = self.classes.Data