Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/15432
Let me show you an example:
https://www.ibm.com/support/knowledgecenter/SSEPEK_11.0.0/sqlref/src/tpc/db2z_bif_rand.html
This is the official document of `rand` in DB2 z/OS. Below is about the
input parameter:
1. If numeric-expression is specified, it is used as the seed value. The
argument must be an expression that returns a value of a built-in integer data
type (SMALLINT or INTEGER). The value must be between 0 and 2,147,483,646.
2. The argument must be an expression that returns a value of a built-in
integer data type (SMALLINT or INTEGER). The value must be between 0 and
2,147,483,646.
3. The result can be null; if the argument is null, the result is the null
value.
4. RAND(0) is processed the same as RAND().
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