Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/4460#issuecomment-75384291
@jkbradley The issue with algorithms handling munging and indexing is the
increased complexity. For example, if `DecisionTree` takes string columns,
there will be some code inside `DecisionTree` that maps them into indices, and
also we need to insert the same logic to the model it produces, and then
save/load for this model.
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