Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/15432
FWIW, the cases below are fine in MySQL:
```sql
mysql> SELECT RAND(CAST(2 AS UNSIGNED));
+---------------------------+
| RAND(CAST(2 AS UNSIGNED)) |
+---------------------------+
| 0.6555866465490187 |
+---------------------------+
1 row in set (0.00 sec)
mysql> SELECT RAND(CAST(NULL AS UNSIGNED));
+------------------------------+
| RAND(CAST(NULL AS UNSIGNED)) |
+------------------------------+
| 0.15522042769493574 |
+------------------------------+
1 row in set (0.00 sec)
```
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