1 files changed, 8 insertions, 0 deletions
diff --git a/activerecord/test/cases/adapters/postgresql/postgresql_adapter_test.rb b/activerecord/test/cases/adapters/postgresql/postgresql_adapter_test.rb
index cfff1f980b..01b3f350b5 100644
--- a/activerecord/test/cases/adapters/postgresql/postgresql_adapter_test.rb
+++ b/activerecord/test/cases/adapters/postgresql/postgresql_adapter_test.rb
@@ -334,6 +334,14 @@ module ActiveRecord
           @connection.columns_for_distinct("posts.id", ["posts.created_at desc", "posts.position asc"])
       end
 
+      def test_columns_for_distinct_with_case
+        assert_equal(
+          'posts.id, CASE WHEN author.is_active THEN UPPER(author.name) ELSE UPPER(author.email) END AS alias_0',
+          @connection.columns_for_distinct('posts.id',
+            ["CASE WHEN author.is_active THEN UPPER(author.name) ELSE UPPER(author.email) END"])
+        )
+      end
+
       def test_columns_for_distinct_blank_not_nil_orders
         assert_equal "posts.id, posts.created_at AS alias_0",
           @connection.columns_for_distinct("posts.id", ["posts.created_at desc", "", "   "])