aggregate_column(column_name) private

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# File activerecord/lib/active_record/relation/calculations.rb, line 191
    def aggregate_column(column_name)
      if @klass.column_names.include?(column_name.to_s)
        Arel::Attribute.new(@klass.unscoped.table, column_name)
      else
        Arel.sql(column_name == :all ? "*" : column_name.to_s)
      end
    end
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