Github user tdas commented on the issue: https://github.com/apache/spark/pull/16758 I addressed all the comments. However, @zsxwing, our offline discussion of throwing error on `.update(null)` ran into a problem. Since its typed as S, the behavior is odd when S is primitive type. See the failing test. When the type is Int, `get` return 0 when the state does not exist. That's very non-intuitive.
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