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module Arel
class TreeManager
# FIXME: Remove this.
include Arel::Relation
attr_accessor :visitor
def initialize engine
@engine = engine
@visitor = Visitors.visitor_for @engine
end
def to_dot
Visitors::Dot.new.accept @head
end
def to_sql
@visitor.accept @head
end
def initialize_copy other
super
@head = @head.clone
end
end
end
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