1 files changed, 17 insertions, 0 deletions
diff --git a/db/post_migrate/20171124100152_remove_index_on_merge_request_diffs_merge_request_diff_id.rb b/db/post_migrate/20171124100152_remove_index_on_merge_request_diffs_merge_request_diff_id.rb
new file mode 100644
index 00000000000..038e4807000
--- /dev/null
+++ b/db/post_migrate/20171124100152_remove_index_on_merge_request_diffs_merge_request_diff_id.rb
@@ -0,0 +1,17 @@
+class RemoveIndexOnMergeRequestDiffsMergeRequestDiffId < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    if index_exists?(:merge_request_diffs, :merge_request_id)
+      remove_concurrent_index(:merge_request_diffs, :merge_request_id)
+    end
+  end
+
+  def down
+    add_concurrent_index(:merge_request_diffs, :merge_request_id)
+  end
+end