Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/22234
This is rather a quite corner case (see the elaborated cases in the JIRA
[SPARK-17916](https://issues.apache.org/jira/browse/SPARK-17916)) and there's
ambiguity to treat this as a bug or a proper behaviour change; however, I don't
object if this can be worth enough as something that should be mentioned.
cc @MaxGekk for a followup
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