Github user jaltekruse commented on the pull request:
https://github.com/apache/drill/pull/136#issuecomment-135203792
We should have a plan verification test to make sure that this change
actually has the desired effect. This should be able to execute fine without
your change as well, but the plan will have and unnecessary
SelectionVectorRemover in it today. You can see examples of plan verification
tests in
/Users/jaltekruse/drill/exec/java-exec/src/test/java/org/apache/drill/TestCTASPartitionFilter.java
and other subclasses of PlanTestBase
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