Github user JustinPihony commented on the issue:
https://github.com/apache/spark/pull/14077
@gatorsmile If `copy` is a bug, then that is fine with me (I just commented
my findings on this and will be curious to hear back). That said, it would make
my implementation simpler. I'd be fine with simplifying it down to a basic
save, however I am still not OK with the circular reference. It adds confusion
to debugging and future refactorings. And to fix that, you end up back at my
PR. So, ultimately this still seems like a duplicate to me.
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