construct_limited_ids_condition

# File activerecord/lib/active_record/relation/finder_methods.rb, line 251
    def construct_limited_ids_condition(relation)
      orders = relation.order_values.map { |val| val.presence }.compact
      values = @klass.connection.distinct("#{@klass.connection.quote_table_name table_name}.#{primary_key}", orders)

      relation = relation.dup

      ids_array = relation.select(values).collect {|row| row[primary_key]}
      ids_array.empty? ? raise(ThrowResult) : table[primary_key].in(ids_array)
    end