Github user gatorsmile commented on the pull request:
https://github.com/apache/spark/pull/9385#issuecomment-156730810
@marmbrus CachedTableSuite failed due to the same reason. We did not clean
up the subquery names. Thus, it is unable to give a correct result when
deciding if Exchange is needed.
I did the fix by using `semanticEquals`. Please check if the changes
appropriate. https://github.com/apache/spark/pull/9216
Now, all the test cases passed. Thanks.
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