Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/15432
Added `extend` is printed as below:
```sql
spark-sql> DESCRIBE FUNCTION EXTENDED rand;
Function: rand
Class: org.apache.spark.sql.catalyst.expressions.Rand
Usage: rand(a) - Returns a random column with i.i.d. uniformly distributed
values in [0, 1].
Extended Usage:
> SELECT rand();
0.9629742951434543
> SELECT rand(0);
0.8446490682263027
> SELECT rand(NULL);
0.8446490682263027
Time taken: 0.022 seconds, Fetched 4 row(s)
```
```sql
spark-sql> DESCRIBE FUNCTION EXTENDED randn;
Function: randn
Class: org.apache.spark.sql.catalyst.expressions.Randn
Usage: randn(a) - Returns a random column with i.i.d. gaussian random
distribution.
Extended Usage:
> SELECT randn();
-0.3254147983080288
> SELECT randn(0);
1.1164209726833079
> SELECT randn(NULL);
1.1164209726833079
Time taken: 0.02 seconds, Fetched 4 row(s)
```
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