build_select(arel) private

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# File activerecord/lib/active_record/relation/query_methods.rb, line 1096
    def build_select(arel)
      if select_values.any?
        arel.project(*arel_columns(select_values.uniq))
      else
        arel.project(@klass.arel_table[Arel.star])
      end
    end
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