gitlab-org--gitlab-foss/db/migrate/20171207185153_add_merge_request_state_index.rb

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class AddMergeRequestStateIndex < ActiveRecord::Migration
include Gitlab::Database::MigrationHelpers
DOWNTIME = false
disable_ddl_transaction!
def up
add_concurrent_index :merge_requests, [:source_project_id, :source_branch],
where: "state = 'opened'",
name: 'index_merge_requests_on_source_project_and_branch_state_opened'
end
def down
remove_concurrent_index_by_name :merge_requests,
'index_merge_requests_on_source_project_and_branch_state_opened'
end
end