Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/21596
It sounds like Jackson have an important behavior change that might impact
us.
```Scala
import com.fasterxml.jackson.annotation.JsonInclude.Include
import com.fasterxml.jackson.databind.{DeserializationFeature, ObjectMapper}
import com.fasterxml.jackson.module.scala.DefaultScalaModule
import com.fasterxml.jackson.module.scala.experimental.ScalaObjectMapper
val mapper = new ObjectMapper with ScalaObjectMapper
mapper.setSerializationInclusion(Include.NON_NULL)
mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false)
mapper.registerModule(DefaultScalaModule)
println(mapper.writeValueAsString(Map("abc" -> null)))
```
Previously, it outputs `{"abc":null}`, but now it is `{}`, unless we
explicitly set it to `Include.ALWAYS`. The upgrade looks risky to me.
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