Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/6218#issuecomment-102914723
My concern was users who might be relying on the existing defined behavior
of this returning all double columns. Basically, it seems like aggregating
over all numeric columns is defined behavior, whereas aggregating over
non-numeric columns is undefined behavior. It's fine to change undefined
behavior, but I think we should avoid changing defined behavior if it's
possible to do so.
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