Update gc profile.

Author: metaskills

test/profile/gc_profile_case.rb

@@ -37,6 +37,15 @@ def test_select_one
     end
   end
 
+  def test_columns
+    bench_allocations('columns') do
+      100.times do 
+        Topic.reset_column_information
+        Topic.columns
+      end
+    end
+  end
+  
 
   protected