holdenk commented on issue #20146: [SPARK-11215][ML] Add multiple columns support to StringIndexer URL: https://github.com/apache/spark/pull/20146#issuecomment-450701693 I like how you've addressed that with the handling of NaNs. I'll give this a once-over on Friday just to make sure everythings ok. I saw some comments from @dbtsai & @felixcheung if they want to also take a last look over this week maybe?
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