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perform_calculation(operation, column_name, options = {}) private

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# File activerecord/lib/active_record/relation/calculations.rb, line 198
    def perform_calculation(operation, column_name, options = {})
      operation = operation.to_s.downcase

      # If #count is used with #distinct / #uniq it is considered distinct. (eg. relation.distinct.count)
      distinct = self.distinct_value
      if options.has_key?(:distinct)
        ActiveSupport::Deprecation.warn "The :distinct option for `Relation#count` is deprecated. "            "Please use `Relation#distinct` instead. (eg. `relation.distinct.count`)"
        distinct = options[:distinct]
      end

      if operation == "count"
        column_name ||= (select_for_count || :all)

        unless arel.ast.grep(Arel::Nodes::OuterJoin).empty?
          distinct = true
        end

        column_name = primary_key if column_name == :all && distinct

        distinct = nil if column_name =~ /\s*DISTINCT\s+/
      end

      if group_values.any?
        execute_grouped_calculation(operation, column_name, distinct)
      else
        execute_simple_calculation(operation, column_name, distinct)
      end
    end
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