Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/9736#issuecomment-165022881
@jkbradley ah, even if it's an experimental API? OK, seems simple enough.
It's no problem to ignore the extra new column in old versions. If the new
column isn't present, it's a little funny to figure out what the explained
variance should be. Probably empty or null is the best that can be done -- or
is it best to fail anyway?
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