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build_select(arel) private

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# File activerecord/lib/active_record/relation/query_methods.rb, line 1041
      def build_select(arel)
        if select_values.any?
          arel.project(*arel_columns(select_values.uniq))
        elsif klass.ignored_columns.any?
          arel.project(*klass.column_names.map { |field| arel_attribute(field) })
        else
          arel.project(@klass.arel_table[Arel.star])
        end
      end
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