Github user viirya commented on the issue:

    https://github.com/apache/spark/pull/18652
  
    It seems to me that non-deterministic prediction in Join's condition is a 
corner use-case. A general (multiple) non-deterministic predicates in Join's 
condition maybe more rare case to encounter.
    
    Another reason is, to support multiple non-deterministic predicates in 
Join's condition, a much complex query plan (such as much additional Joins) 
seems inevitable. I'd like to avoid that if possible.
    



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