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# frozen_string_literal: true
class AddIndexesIssuesOnProjectIdAndClosedAt < Gitlab::Database::Migration[2.0]
disable_ddl_transaction!
OLD_INDEX_NAME = 'index_issues_on_project_id_and_closed_at'
NEW_INDEX_NAME_1 = 'index_issues_on_project_id_closed_at_desc_state_id_and_id'
NEW_INDEX_NAME_2 = 'index_issues_on_project_id_closed_at_state_id_and_id'
def up
# Index to improve performance when sorting issues by closed_at desc
unless index_exists_by_name?(:issues, NEW_INDEX_NAME_1)
add_concurrent_index :issues, 'project_id, closed_at DESC NULLS LAST, state_id, id', name: NEW_INDEX_NAME_1
end
# Index to improve performance when sorting issues by closed_at asc
# This replaces the old index which didn't account for state_id and id
unless index_exists_by_name?(:issues, NEW_INDEX_NAME_2)
add_concurrent_index :issues, [:project_id, :closed_at, :state_id, :id], name: NEW_INDEX_NAME_2
end
remove_concurrent_index_by_name :issues, OLD_INDEX_NAME
end
def down
add_concurrent_index :issues, [:project_id, :closed_at], name: OLD_INDEX_NAME
remove_concurrent_index_by_name :issues, NEW_INDEX_NAME_1
remove_concurrent_index_by_name :issues, NEW_INDEX_NAME_2
end
end
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