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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