eql?

# File activerecord/lib/arel/nodes/update_statement.rb, line 28
      def eql?(other)
        self.class == other.class &&
          self.relation == other.relation &&
          self.wheres == other.wheres &&
          self.values == other.values &&
          self.orders == other.orders &&
          self.limit == other.limit &&
          self.offset == other.offset &&
          self.key == other.key
      end