Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/15797
> In renamePartition of HiveExternalCatalog, we update the file names to
preserve the case after renaming partitions. How about another command
loadPartition? More generally, if we insert new data into a partitioned table,
Hive will create a new directory for non-existent partitions. These newly
created file path are not case-preserving, right?
This PR tries its best to fix some partition related behaviours, I think
it's OK to leave some hard works for follow-ups.
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