Github user maropu commented on the issue:
https://github.com/apache/spark/pull/14038
yea, as for data files, it's okay to filter out '_' and '.'. But, the file
pattens of metadata depend on file formats as suggested in
https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/PartitioningAwareFileIndex.scala#L433
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