Github user mpjlu commented on the issue:
https://github.com/apache/spark/pull/18832
Thanks @sethah .
I strongly think we should update the commend or just delete the comment as
the current PR.
Another reason is: there are three kinds of feature: categorical, ordered
categorical, and continuous
Only the first iteration of categorical feature need parentStats, the other
two don't need. The comment seems all first iteration need parentStats.
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