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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