Github user jerryshao commented on the issue:
https://github.com/apache/spark/pull/20683
> a extra boolean expression was added to test if a regex was present.
Can you please explain what's the meaning of "if a regex was present"?
Seems the fix is not so necessary. If you want to filter out some temp
files, you can write your own `filter` instead of using Spark Streaming's
default one.
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