Github user dbtsai commented on the issue:
https://github.com/apache/spark/pull/22597
In `ParquetFilter`, the way we test if a predicate pushdown works is by
removing that predicate from Spark SQL physical plan, and only relying on the
reader to do the filter. Thus, if there is a bug in pushdown filter in reader,
Spark will get the incorrect result. This can use in test to ensure no
regression later.
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