Github user Fokko commented on the issue:
https://github.com/apache/spark/pull/21596
I will first fix the tests, and then assert the performance if you agree.
Changing the annotations might impact the performance.
Regarding the difference between `NON_NULL`, `NON_ABSENT`, `NON_EMPTY`,
please refer to Jackson:
https://fasterxml.github.io/jackson-annotations/javadoc/2.7/com/fasterxml/jackson/annotation/JsonInclude.Include.html
The `NON_EMPTY` makes the most sense to me. I agree that we should keep the
behaviour like it is right now.
`NON_EMPTY`: Value that indicates that only properties with null value, or
what is considered empty, are not to be included.
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