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# frozen_string_literal: true
module Arel # :nodoc: all
module Nodes
class Function < Arel::Nodes::NodeExpression
include Arel::WindowPredications
attr_accessor :expressions, :alias, :distinct
def initialize(expr, aliaz = nil)
super()
@expressions = expr
@alias = aliaz && SqlLiteral.new(aliaz)
@distinct = false
end
def as(aliaz)
self.alias = SqlLiteral.new(aliaz)
self
end
def hash
[@expressions, @alias, @distinct].hash
end
def eql?(other)
self.class == other.class &&
self.expressions == other.expressions &&
self.alias == other.alias &&
self.distinct == other.distinct
end
alias :== :eql?
end
%w{
Sum
Exists
Max
Min
Avg
}.each do |name|
const_set(name, Class.new(Function))
end
end
end
|
