lib/sql_algebra/relations/predicates/equality_predicate.rb


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class EqualityPredicate < BinaryPredicate
  def ==(other)
    self.class == other.class and
      ((attribute1.eql?(other.attribute1) and attribute2.eql?(other.attribute2)) or
       (attribute1.eql?(other.attribute2) and attribute2.eql?(other.attribute1)))
  end
end