Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/18991
If ORC incorrectly filters out the extra rows, we might get incorrect
results. In addition, we do not know whether the push down could get the
performance gain. We saw the performance regression when we push down the
filters to Parquet in some cases.
To ensure the code quality, we need to port the end-to-end test cases that
are built in Apache ORC/Parquet. This will also help the community in the long
term. If you have a bandwidth, you can make an attempt.
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