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# frozen_string_literal: true
module Gitlab
module Analytics
module CycleAnalytics
class Median
include StageQueryHelpers
def initialize(stage:, query:)
@stage = stage
@query = query
end
def seconds
@query = @query.select(median_duration_in_seconds.as('median'))
result = execute_query(@query).first || {}
result['median'] ? result['median'].to_i : nil
end
private
attr_reader :stage
def percentile_cont
percentile_cont_ordering = Arel::Nodes::UnaryOperation.new(Arel::Nodes::SqlLiteral.new('ORDER BY'), duration)
Arel::Nodes::NamedFunction.new(
'percentile_cont(0.5) WITHIN GROUP',
[percentile_cont_ordering]
)
end
def median_duration_in_seconds
Arel::Nodes::Extract.new(percentile_cont, :epoch)
end
end
end
end
end
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