Github user sameeragarwal commented on the pull request:
https://github.com/apache/spark/pull/11854#issuecomment-200460100
I think it'd be great to have it. However, as Michael had suggested
earlier, it'd be nice to first come up with a set of candidate queries that'd
potentially benefit from these optimizations in order to better motivate the
kind per-attribute constraints we need to track. I think q38 is an excellent
example. Do you have some others in mind?
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