Github user HyukjinKwon commented on the issue:
    Strictly, the JIRA describes handling `null` and we might not have to 
generalize the cases further.
    > it will failed when do select rand(null)
    Also, I would like to add the edge cases here but I'd like to avoid PR is 
being hold. 
    As not all the things have a standard to follow, we can define the 
behaviour here. I don't have access to Oracle and DB2. Do you think Hive, 
PostgreSQL and MySQL examples are not enough?

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