Github user mateiz commented on the pull request:
https://github.com/apache/spark/pull/2912#issuecomment-60315168
Interesting question. For uncaching, I think it makes the most sense to
refer to the tables by name even if two cached tables might be the same RDD.
Thus you should not be able to uncache tempTable2 above, and tempTable1 should
still be cached. When you test whether a cached table meets a plan, you can
pick the first one that does.
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