rednaxelafx commented on issue #28008: [SPARK-27692][SQL] Constant fold 
deterministic Scala UDFs with foldable arguments
URL: https://github.com/apache/spark/pull/28008#issuecomment-603599059
 
 
   Thank you very much for linking this PR to the existing JIRA ticket and its 
PR!
   I vaguely remember this had been implemented before but didn't find it in 
master and got curious... now I know >_<|||
   
   It's highly likely that this PR won't be good enough to make the bar, but 
I'd like to hear other folks' opinions.
   Thanks.
   
   Basically this is a hurdle that we cannot get past until the APIs are 
clarified and the semantics of `ScalaUDF.deterministic` is strong enough for 
optimizations to depend on:
   https://github.com/apache/spark/pull/24593#pullrequestreview-237361795
   
   I had the same concerns when sending out this PR, and I'm more than okay to 
withdraw and close this PR given the current state of the API/semantics.

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