Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/21892
> we can get 3.5 times perf improvement for `count()`.
We shouldn't merge this as is for clarification. it needs a close look
after #21909 which avoids the parsing code path by Univocity. How about this:
after #21909, we should rerun the benchmark and see the numbers, and decide if
we should reject this one or not.
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