Github user vanzin commented on the issue:
https://github.com/apache/spark/pull/22926
Is this a problem in master at all?
The data is serialized with `JacksonMessageWriter`, which seems to be
configured properly:
```
private[v1] class JacksonMessageWriter extends MessageBodyWriter[Object]{
...
mapper.setSerializationInclusion(JsonInclude.Include.NON_ABSENT)
```
An easy way to answer that question is to write a unit test.
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