build_subquery

# File activerecord/lib/active_record/relation/query_methods.rb, line 1606
      def build_subquery(subquery_alias, select_value) # :nodoc:
        subquery = except(:optimizer_hints).arel.as(subquery_alias)

        Arel::SelectManager.new(subquery).project(select_value).tap do |arel|
          arel.optimizer_hints(*optimizer_hints_values) unless optimizer_hints_values.empty?
        end
      end