Fix result set handling for case insensitive dupe cols

Fixed bug where when using ``case_sensitive=False`` with an
:class:`.Engine`, the result set would fail to correctly accomodate
for duplicate column names in the result set, causing an error
when the statement is executed in 1.0, and preventing the
"ambiguous column" exception from functioning in 1.1.

Change-Id: If582bb9fdd057e4da3ae42f7180b17d1a1a2d98e
Fixes: #3690

1 files changed, 15 insertions, 0 deletions

diff --git a/test/sql/test_resultset.py b/test/sql/test_resultset.py
index ba85fb82e..f74e51f62 100644
--- a/test/sql/test_resultset.py
+++ b/test/sql/test_resultset.py
@@ -689,6 +689,21 @@ class ResultProxyTest(fixtures.TablesTest):
         )
 
     @testing.requires.duplicate_names_in_cursor_description
+    def test_ambiguous_column_case_sensitive(self):
+        eng = engines.testing_engine(options=dict(case_sensitive=False))
+
+        row = eng.execute(select([
+            literal_column('1').label('SOMECOL'),
+            literal_column('1').label('SOMECOL'),
+        ])).first()
+
+        assert_raises_message(
+            exc.InvalidRequestError,
+            "Ambiguous column name",
+            lambda: row['somecol']
+        )
+
+    @testing.requires.duplicate_names_in_cursor_description
     def test_ambiguous_column_contains(self):
         users = self.tables.users
         addresses = self.tables.addresses