Github user dongjoon-hyun commented on the issue:
https://github.com/apache/spark/pull/21372
@gatorsmile .
Basically, ORC-301 will reduce the change of ORC file leakage in some
cases. I made that patch and merged it long time ago, but it's released at this
release. Also, ORC-306 fixes a bug on Java `Timestamp` and it's ORC workaround.
Please see [here for the detail of Java Timestamp bug and the issue on previous
ORC workaround](https://issues.apache.org/jira/browse/ORC-306).
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