Github user snodawn commented on the issue:
https://github.com/apache/spark/pull/15726
I have tested the new patch for dynamic partition. It still costs a long
time in running overwrite statement as the same with hive 1.2.1. The execution
logs show that when running in dynamic partition it move each file of the
partition to .Trash instead of the whole partition, which may cost a lot of
time in this way.
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