Github user hvanhovell commented on the issue:
https://github.com/apache/spark/pull/18136
I just came across this expression and I have a few concerns:
1. A row will not get the same UUID assigned when a task fails. This might
cause some really weird problems when the UUID column is used later-on.
2. UUID.randomString() uses a lot of synchronization in the background.
This might make it pretty slow.
Shall I file a ticket?
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