Github user rick-ibm commented on the pull request:
https://github.com/apache/spark/pull/9419#issuecomment-153159484
Thanks for the ongoing discussion, Xiao and Herman. At the very least, it
would be useful to capture Herman's analysis in the code comment which explains
why we are inserting an extra projection. Xiao's approach sounds like good,
incremental improvement. More test cases would help test the correctness of an
alternative solution if someone wants to try their hand at one.
It would be interesting to see the code for Herman's approach so that we
can evaluate whether it is simple (as Herman says) or complex (as Xiao says).
Thanks,
-Rick
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