GitHub user HyukjinKwon reopened a pull request:
https://github.com/apache/spark/pull/15432
[SPARK-17854][SQL] rand/randn allows null as input seed
## What changes were proposed in this pull request?
This PR proposes `rand`/`randn` accept `null` as input. In this case, it
treats the values as `0`.
It seems MySQL also accepts this.
```sql
mysql> select rand(0);
+---------------------+
| rand(0) |
+---------------------+
| 0.15522042769493574 |
+---------------------+
1 row in set (0.00 sec)
mysql> select rand(NULL);
+---------------------+
| rand(NULL) |
+---------------------+
| 0.15522042769493574 |
+---------------------+
1 row in set (0.00 sec)
```
and also Hive does according to
[HIVE-14694](https://issues.apache.org/jira/browse/HIVE-14694)
## How was this patch tested?
Unit tests in `DataFrameSuite.scala` and `RandomSuite.scala`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/HyukjinKwon/spark SPARK-17854
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/15432.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #15432
----
commit 7fa7db22dd4f2ba88ab1f09e4b776003b3f62fdb
Author: hyukjinkwon <gurwls...@gmail.com>
Date: 2016-10-11T09:21:18Z
rand/randn allows null as input seed
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