debian-mirror-gitlab/lib/gitlab/database/as_with_materialized.rb

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# frozen_string_literal: true
module Gitlab
module Database
# This class is a special Arel node which allows optionally define the `MATERIALIZED` keyword for CTE and Recursive CTE queries.
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class AsWithMaterialized < Arel::Nodes::As
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extend Gitlab::Utils::StrongMemoize
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MATERIALIZED = 'MATERIALIZED '
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def initialize(left, right, materialized: true)
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if materialized && self.class.materialized_supported?
right.prepend(MATERIALIZED)
end
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super(left, right)
end
# Note: to be deleted after the minimum PG version is set to 12.0
def self.materialized_supported?
strong_memoize(:materialized_supported) do
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ApplicationRecord.database.version.match?(/^1[2-9]\./) # version 12.x and above
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end
end
# Note: to be deleted after the minimum PG version is set to 12.0
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# Update the documentation together when deleting the method
# https://docs.gitlab.com/ee/development/merge_request_performance_guidelines.html#use-ctes-wisely
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def self.materialized_if_supported
materialized_supported? ? 'MATERIALIZED' : ''
end
end
end
end