Github user MLnick commented on the pull request:
https://github.com/apache/spark/pull/11601#issuecomment-215719811
@hhbyyh if you have time, could you create 2 follow up JIRAs for:
* PySpark impl
* adding mode at a later date for categorical features
* investigate efficiency of approaches using DataFrame/Dataset and/or
approx approaches such as `frequentItems` or Count-Min Sketch (will require an
update to CMS to return "heavy-hitters").
* investigate if we can use metadata to only allow mode for categorical
features (or perhaps as an easier alternative, allow mode for only Int/Long
columns)
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