openproject/app/models/cost_query/group_by/sql_aggregation.rb

module CostQuery::GroupBy
  module SqlAggregation
    def responsible_for_sql?
      true
    end

    def compute_result
      super.tap { |r| r.important_fields = group_fields }.grouped_by(all_group_fields(false), type, group_fields)
    end

    def sql_statement
      super.tap do |sql|
        define_group sql
        sql.sum :units => :units, :real_costs => :real_costs, :display_costs => :display_costs
        sql.count
      end
    end
  end
end