srowen commented on issue #25983: [SPARK-29327][MLLIB]Support specifying features via multiple columns URL: https://github.com/apache/spark/pull/25983#issuecomment-545519952 You're suggesting that some implementation would prefer to be passed n columns, rather than 1 vector column of n values, because it might be more optimal in some cases. I'm asking what the use case is, either in theory or in practice. Are you saying the xgboost impl already effectively allows this?
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