Github user markhamstra commented on the issue:
https://github.com/apache/spark/pull/18807
Maven is the build of reference, true; but maven itself doesn't need the
JDK version to be specified both in the scala plugin configuration and in the
compiler plugin configuration. While I understand that IntelliJ is used by many
Spark developers, it isn't some sort of officially preferred IDE of reference.
That's why I have some qualms about embedding workarounds into our POM just to
satisfy the idiosyncrasies of a particular IDE.
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