Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/15432
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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