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class FillArrayColumnForLabels < ActiveRecord::Migration[5.1]
include Gitlab::Database::MigrationHelpers
DOWNTIME = false
def up
update!('issues')
update!('merge_requests')
end
private
def update!(table)
execute <<-SQL
UPDATE #{table}
SET label_titles = subquery.label_titles
FROM
(
SELECT #{table}.id AS id, array_agg(labels.title) AS label_titles
FROM #{table}
LEFT JOIN label_links ON target_id = #{table}.id AND label_links.target_type = 'Issue'
LEFT JOIN labels ON label_id = labels.id
GROUP BY #{table}.id
) AS subquery
WHERE #{table}.id = subquery.id;
SQL
end
end
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