Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/9241#issuecomment-150994599
I know that this is still `WIP`, but were you thinking about also enabling
this for the two `Spillable` collections (ExternalAppendOnlyMap and
ExternalSorter)? That's probably a lower priority given that we're most
concerned about optimizing SQL's memory usage, but it would still be nice to
do. If we decide to defer it for now, let's create a followup task to do it in
the next release.
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