group

# File activerecord/lib/arel/select_manager.rb, line 76
    def group(*columns)
      columns.each do |column|
        # FIXME: backwards compat
        column = Nodes::SqlLiteral.new(column) if String === column
        column = Nodes::SqlLiteral.new(column.to_s) if Symbol === column

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