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class JoinOperation
attr_reader :relation1, :relation2
def initialize(relation1, relation2)
@relation1, @relation2 = relation1, relation2
end
def on(*predicates)
relation_class.new(relation1, relation2, *predicates)
end
def ==(other)
(relation1 == other.relation1 and relation2 == other.relation2) or
(relation1 == other.relation2 and relation2 == other.relation1)
end
end
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