Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/4693#issuecomment-76842442
@mccheah we [set the serializer in SQL on a per-shuffle
basis](https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/execution/Exchange.scala#L72),
so that would surprise me. However, if you can show it happening we should
certainly fix it.
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