Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/13701
See [the
comment](https://github.com/apache/spark/pull/13728#issuecomment-226696567) by
@HyukjinKwon the filter is applied more than once. That means, it could be
expensive if the filter does not prune a lot of rows. Not sure if my
understanding is right.
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