Github user rdblue commented on the issue:
https://github.com/apache/spark/pull/13701
@gatorsmile, we've not seen a penalty from running row group level tests
when no row groups are filtered and we've decided to turn on dictionary
filtering by default. You may see a penalty from using Parquet's internal
record-level filter rather than a codegened filter. My recommendation (which is
being discussed on the Parquet list) is to add the ability to filter row groups
without turning on record-level filters. Should be easy and would solve your
problem.
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