Github user KyleLi1985 commented on the issue:
https://github.com/apache/spark/pull/22893
> OK, the Spark part doesn't seem relevant. The input might be more
realistic here, yes. I was commenting that your test code doesn't show what
you're testing, though I understand you manually modified it. Because the test
is so central here I think it's important to understand exactly what you're
measuring and exactly what you're running.
>
> This doesn't show an improvement, right?
TEST, I agree with you
No influence for sparse case
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