nbauernfeind opened a new issue, #586:
URL: https://github.com/apache/arrow-java/issues/586
### Describe the bug, including details regarding any error messages,
version, and platform.
A UnionMapWriter will null out the entire map struct entry instead of
setting the value to null:
```
childWriter.value().fixedSizeBinary().writeNull();
```
Actually hits `NullableStructWriter#writeNull` whereas UnionMapWriter should
override `writeNull` and do a switch on the mode (though I'm not certain if
null keys are valid).
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