Github user davies commented on the pull request:
https://github.com/apache/spark/pull/8511#issuecomment-136096227
@andrewor14 Not only SortMergeJoin has this problem, SortMergeOuterJoin
also has it. And, any join that depends on TungstenAggregation or TungstenSort
will have this problem. I think ZipPartitionRDDs is the only place that could
introduce multiple MapPartitionsWithPrepareRDD in the same task. Correct me, if
there are others.
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