viirya commented on issue #20146: [SPARK-11215][ML] Add multiple columns 
support to StringIndexer
URL: https://github.com/apache/spark/pull/20146#issuecomment-451793594
 
 
   > I am curious why the need to change the doctests in the DT classification 
one?
   
   I looked at it. The change is from original PR #19621. Looking at the 
discussion there, I didn't find related info.
   
   I reverted this change and tested it locally. Seems the change is not 
necessary. I'd revert it first and see if @WeichenXu123 has more comments on 
this.

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