Github user ajacques commented on the issue: https://github.com/apache/spark/pull/21320 @HyukjinKwon, I'm not totally familiar with Spark internals yet, so to be honest I don't feel confident making big changes and hopefully can keep them simple at first. I've gone through the code review comments and made as many changes as possible [here](https://github.com/apache/spark/compare/master...ajacques:spark-4502-parquet_column_pruning-foundation). If this PR is mostly feature complete and it's just small things, then I can push forward. If the feedback comments push past simple refactoring level right now I would prefer to let someone else take over, but feel free to use what I've done.
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