Github user rdblue commented on the issue:
https://github.com/apache/spark/pull/21070
> Based on the previous upgrade (e.g., #13280 (comment)), we hit the
performance regressions when we upgrade Parquet and we did the revert at the
end.
I should point out that the regression wasn't reproducible, so we aren't
sure what the cause was. We also didn't have performance numbers on the Parquet
side or a case of anyone running it in production (we have been for a couple
months). But, I can understand wanting to be thorough.
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