group

# File activerecord/lib/arel/select_manager.rb, line 74
    def group(*columns)
      columns.each do |column|
        # FIXME: backwards compat
        case column
        when Nodes::SqlLiteral
        when String
          column = Nodes::SqlLiteral.new(column)
        when Symbol
          column = Nodes::SqlLiteral.new(column.name)
        end

        @ctx.groups.push Nodes::Group.new column
      end
      self
    end