huaxingao commented on issue #26064: [SPARK-23578][ML][PYSPARK] Binarizer 
support multi-column
   I have a general question: What is the criteria for adding multi-column 
support to a ML algorithm? Right now ```Bucketizer```, ```StringIndexer```, 
```QuantileDiscretizer```, and this ```Binarizer``` support multi-column. Do we 
need to add multi-column support to other algorithms? 

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