Github user tdas commented on the issue:
https://github.com/apache/spark/pull/16758
@zsxwing had a discussion with @marmbrus. It is indeed weird that after
calling `state.remove()` and `state.get` will return 0 if it is of type int (as
in JVM null casted to int = 0). So we went back to the semantics of `get`
throwing error when state does not exist.
This ensures the following semantics that @marmbrus originally desired.
- `update(null)` is not allowed - for primitive types, compile disallows
it; for other types, it throw IllegalArgumentException
- Hence, `get` will never return `Some(null)`.
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