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module Arel
module Nodes
class Extract < Arel::Nodes::Unary
include Arel::AliasPredication
include Arel::Predications
attr_accessor :field
def initialize expr, field
super(expr)
@field = field
end
def hash
super ^ @field.hash
end
def eql? other
super &&
self.field == other.field
end
alias :== :eql?
end
end
end
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