build_select

# File activerecord/lib/active_record/relation/query_methods.rb, line 1903
      def build_select(arel)
        if select_values.any?
          arel.project(*arel_columns(select_values))
        elsif model.ignored_columns.any? || model.enumerate_columns_in_select_statements
          arel.project(*model.column_names.map { |field| table[field] })
        else
          arel.project(table[Arel.star])
        end
      end