Github user rdblue commented on the issue:
https://github.com/apache/spark/pull/16281
The improvement is in how row groups are garbage collected. G1GC puts
humongous allocations directly into the old generation, so you end up needing a
full GC to reclaim the space. That just increases memory pressure, so you run
out of memory and run full GCs and/or spill to disk. We don't have data yet
because I haven't pushed the feature or metrics collection for it.
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