huaxingao commented on issue #26064: [SPARK-23578][ML][PYSPARK] Binarizer support multi-column URL: https://github.com/apache/spark/pull/26064#issuecomment-540787575 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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