Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/21892
@HyukjinKwon We need to rerun the perf tests after
https://github.com/apache/spark/pull/21909 is merged.
We are also unable to accept the perf regression larger than `5%`. Based on
the description, we still face a performance regression besides `count()`
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