db/post_migrate/20171124095655_add_index_on_merge_request_diffs_merge_request_id_and_id.rb


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class AddIndexOnMergeRequestDiffsMergeRequestIdAndId < ActiveRecord::Migration[4.2]
  include Gitlab::Database::MigrationHelpers

  DOWNTIME = false

  disable_ddl_transaction!

  def up
    add_concurrent_index(:merge_request_diffs, [:merge_request_id, :id])
  end

  def down
    if index_exists?(:merge_request_diffs, [:merge_request_id, :id])
      remove_concurrent_index(:merge_request_diffs, [:merge_request_id, :id])
    end
  end
end