Github user srowen commented on the issue:
https://github.com/apache/spark/pull/16281
The tricky part about upgrading Parquet is whether it will continue to work
with other dependencies that work with Parquet. It's also worth considering
that a different Parquet may be on the classpath at runtime, certainly for
older versions of Hadoop.
We should probably proceed with this if it's fixing important bugs. It's
worth scanning through what changes went in from 1.8 to 1.9 to see if anything
looks like a potential behavior change or compatibility issue.
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