1 files changed, 25 insertions, 0 deletions
diff --git a/db/migrate/20190109153125_add_merge_request_external_diffs.rb b/db/migrate/20190109153125_add_merge_request_external_diffs.rb
new file mode 100644
index 00000000000..c67903c7f67
--- /dev/null
+++ b/db/migrate/20190109153125_add_merge_request_external_diffs.rb
@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class AddMergeRequestExternalDiffs < ActiveRecord::Migration[5.0]
+  include Gitlab::Database::MigrationHelpers
+
+  # Set this constant to true if this migration requires downtime.
+  DOWNTIME = false
+
+  def change
+    # Allow the merge request diff to store details about an external file
+    add_column :merge_request_diffs, :external_diff, :string
+    add_column :merge_request_diffs, :external_diff_store, :integer
+    add_column :merge_request_diffs, :stored_externally, :boolean
+
+    # The diff for each file is mapped to a range in the external file
+    add_column :merge_request_diff_files, :external_diff_offset, :integer
+    add_column :merge_request_diff_files, :external_diff_size, :integer
+
+    # If the diff is in object storage, it will be null in the database
+    change_column_null :merge_request_diff_files, :diff, true
+  end
+end