Github user kiszk commented on the issue:
https://github.com/apache/spark/pull/20584
I am also thinking about this. I agree with this.
> According to the log, the leaked file stream was created when building
the ORC columnar reader.
I am suspicious about relationship between `afterEach()` and
`addTaskCompletionListener` (call `close()`). But, not sure. Let us try this
approach first.
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