Github user HyukjinKwon commented on the issue:
    @gatorsmile Thanks. I intended to not describe this behaviour first but 
just thought it'd be kind of handling exceptional cases and it's discouraged 
because Hive, MySQL and PostgreSQL at least do not describe this behaviour. I 
will document this if you strongly feel it should be.
    Yes, I can test Python and R but would be more specific about what  shouldI 
test please? This would affect only SQL expression not the actual functions. Do 
you expect the tests as below and do you usually check?
    df <- sql("SELECT RAND(NULL)")
    spark.sql("SELECT RAND(NULL)")
    For any missing case, I will check it out. Can I assume this way looks okay 

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