Github user HyukjinKwon commented on the pull request:
https://github.com/apache/spark/pull/8743#issuecomment-158316387
I added a simple test for this. I wanted to add a test including `null` but
when the given value is `null`, Spark converts it to `IsNull`. To make this
worse, more complicated logics cannot be applied here to test null-safety
properly since now filters are pushed down only for basic operations (not even
cast or arithmetic calculations). For now, I think this is the best to test
this.
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