aggregate_column(column_name) private

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# File activerecord/lib/active_record/relation/calculations.rb, line 441
      def aggregate_column(column_name)
        return column_name if Arel::Expressions === column_name

        arel_column(column_name.to_s) do |name|
          Arel.sql(column_name == :all ? "*" : name)
        end
      end
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