Github user WeichenXu123 commented on the issue:
https://github.com/apache/spark/pull/19317
It is better adding more perf test for `OpenHashSet` replacement to avoid
perf regression. And I found `reduceByKeyLocally` also use `JHashSet`, I am not
sure whether there is some special reason. ping @cloud-fan Can you help confirm
this ? I cannot find the original author for that.
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