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module Arel
class Project < Compound
attr_reader :projections, :attributes, :christener
def initialize(relation, projections)
super(relation)
@projections = projections.map { |p| p.bind(relation) }
@christener = Sql::Christener.new
@attributes = Header.new(projections.map { |x| x.bind(self) })
end
def externalizable?
attributes.any? { |a| a.respond_to?(:aggregation?) && a.aggregation? } || relation.externalizable?
end
def eval
unoperated_rows.collect { |r| r.slice(*projections) }
end
end
end
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