Github user markhamstra commented on the issue:
https://github.com/apache/spark/pull/14039
Actually, they can be reused -- not in Spark as distributed, but it is an
open question whether reusing shuffle files within Spark SQL is something that
we should be doing and want to support. It can be an effective alternative
means of caching. https://issues.apache.org/jira/browse/SPARK-13756
Until that issue is definitively decided, we should not pre-empt the
possibility with this PR.
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