module Arel module Nodes class Function < Arel::Nodes::Node include Arel::Expression attr_accessor :expressions, :alias, :distinct def initialize expr, aliaz = nil @expressions = expr @alias = aliaz @distinct = false end def as aliaz self.alias = SqlLiteral.new(aliaz) self end end %w{ Sum Exists Max Min Avg }.each do |name| const_set(name, Class.new(Function)) end end end