Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/15432
Documentation is printed as below now:
```sql
spark-sql> DESCRIBE FUNCTION EXTENDED RAND;
Function: rand
Class: org.apache.spark.sql.catalyst.expressions.Rand
Usage:
rand() - Returns a random column with i.i.d. uniformly distributed
values in [0, 1].
seed is given randomly.
rand(seed) - Returns a random column with i.i.d. uniformly
distributed values in [0, 1].
seed should be an integer/long/NULL literal.
Extended Usage:
> SELECT rand();
0.9629742951434543
> SELECT rand(0);
0.8446490682263027
> SELECT rand(NULL);
0.8446490682263027
Time taken: 3.799 seconds, Fetched 4 row(s)
spark-sql> DESCRIBE FUNCTION EXTENDED RANDN;
Function: randn
Class: org.apache.spark.sql.catalyst.expressions.Randn
Usage:
randn() - Returns a random column with i.i.d. gaussian random
distribution.
seed is given randomly.
randn(seed) - Returns a random column with i.i.d. gaussian random
distribution.
seed should be an integer/long/NULL literal.
Extended Usage:
> SELECT randn();
-0.3254147983080288
> SELECT randn(0);
1.1164209726833079
> SELECT randn(NULL);
1.1164209726833079
Time taken: 0.073 seconds, Fetched 4 row(s)
```
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