Github user aarondav commented on the pull request:
https://github.com/apache/spark/pull/1366#issuecomment-48698130
This operation seems to assume that a single partition fits in memory --
perhaps this is an assumption of SparkSQL, but it is not a general assumption
in Spark, and it can lead to some very hard-to-diagnose failure conditions. Has
this been taken into account?
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