Github user akopich commented on the issue:
https://github.com/apache/spark/pull/18924
I have conducted some performance testing with random data.
The new implementation turns out to be notably faster.
```
OLD with hyper-parameter optimization : 237 sec
OLD w/o hyper-parameter optimization : 226 sec
NEW with hyper-parameter optimization : 178 sec
NEW w/o hyper-parameter optimization : 171 sec
```
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