Github user gatorsmile commented on the issue:
    Now, at least we have four options, when users setting `NULL` as a seed 
number for `rand`:
    1. Hive/MySQL - `NULL` is equivalent to `0`
    2. DB2 - when the seed is `NULL`, `rand` returns `NULL`
    3. PostgreSQL - when the seed is `NULL`, ignore it. 
    4. SparkSQL - does not allow it.
    I do not have a strong opinion. Maybe @rxin need to make a decision. 

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