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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