Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/22234
@MaxGekk Could you take this PR over? I think we need to merge this to
Spark 2.4. Users can set the behaviors to the previous one by this new conf
`emptyValue`, if needed. Also update the migration guide about the behavior
change and explain how to set `emptyValue`.
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