Github user jendap commented on the pull request:
https://github.com/apache/spark/pull/7375#issuecomment-121159798
It does work without lifecycle-mapping but it shows errors. Not just after
import but all the way until you resolve them.
It is not needed. On the other hand it makes for better experience for some
developers. No downside other than 50 lines in pom.xml and is (unfortunately)
not much for a pom file.
We can remove it. It is your call!
BTW: Note it is in <pluginManagement> only. It does never get executed. It
is just like a comment in source code.
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