[Provide our own Null class](https://lists.apache.org/thread.html/cd6a2e8eb0c369a8814c217fe69910e0cf4613286e887e90db28e061@%3Cdev.tinkerpop.apache.org%3E) is a good choice。 I completely agree @Dmitry Novikov suggestions： `gremlin> g.V().limit(1).project('a', 'b').by(values('name')).by(coalesce(values('notSureIfExists'), constant(Null.instance()))) ==>[a:marko,b:null] seems more elegant than just throw exception` I look forward to this idea will come true as soon as possible
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