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module Arel
module Nodes
class Function < Arel::Nodes::Node
include Arel::Expression
include Arel::Predications
include Arel::WindowPredications
attr_accessor :expressions, :alias, :distinct
def initialize expr, aliaz = nil
@expressions = expr
@alias = aliaz && SqlLiteral.new(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
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