Github user gatorsmile commented on the issue:

    https://github.com/apache/spark/pull/17831
  
    So far, one of the biggest issues is we always assume UDF is deterministic. 
It could cause incorrect results after query optimization. I am working on a 
UDF API change to add more types for UDFs. Will submit a PR recently. 
    
    We can revisit this PR later.


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