Github user hvanhovell commented on the issue:
https://github.com/apache/spark/pull/20699
A very valid use cases for repartitioning is limiting concurrency. For
example when you have a UDF that calls some service you don't want to DDOS that
service because you make requests from too many partitions. In its current form
this PR doesn't break this pattern, but I do wonder where this in its current
form is useful.
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