Github user sryza commented on the pull request:
https://github.com/apache/spark/pull/3302#issuecomment-63362140
I don't entirely understand that line of argument. Why would we want to
place a lower bound if the data structure is pushing the memory threshold? I
filed https://issues.apache.org/jira/browse/SPARK-4456 to figure this out and
document it better.
This patch LGTM though.
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