Github user yucai commented on the issue:
https://github.com/apache/spark/pull/22847
@cloud-fan @gatorsmile How about merging this PR first? And then we can
dissuss those performance issue in other PR?
1. One PR to improve WideTableBenchmark #22823 WIP.
2. One PR to add more tests in WideTableBenchmark.
3. If we can figure out good split threshold based on 2, another PR to
update that value.
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