33 lines
856 B
Ruby
33 lines
856 B
Ruby
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# frozen_string_literal: true
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class AddOldestMergeRequestsIndex < ActiveRecord::Migration[6.0]
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include Gitlab::Database::SchemaHelpers
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include Gitlab::Database::MigrationHelpers
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disable_ddl_transaction!
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# Set this constant to true if this migration requires downtime.
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DOWNTIME = false
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INDEX = 'index_on_merge_requests_for_latest_diffs'
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def up
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return if index_exists_by_name?('merge_requests', INDEX)
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execute "CREATE INDEX CONCURRENTLY #{INDEX} ON merge_requests " \
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'USING btree (target_project_id) INCLUDE (id, latest_merge_request_diff_id)'
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create_comment(
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'INDEX',
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INDEX,
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'Index used to efficiently obtain the oldest merge request for a commit SHA'
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)
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end
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def down
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return unless index_exists_by_name?('merge_requests', INDEX)
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execute "DROP INDEX CONCURRENTLY #{INDEX}"
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end
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end
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