Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/2912#issuecomment-60318114
I agree with matei on the desired semantics here. However, if this only
applies to cases where a table is _identical_ to another cached table, I don't
think it's a super likely situation for people to encounter. Way more likely is
to project, filter, etc to derive a second cached table from an existing one.
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