liukun4515 opened a new issue, #10247:
URL: https://github.com/apache/datafusion/issues/10247
I think the idea here is that expectation is that `rand` is
invoked *once per row* rather than *once per batch*. And the only way it knew
how many rows to make is to get a null array in 🤔
For example, when I run `datafusion-cli` from this PR to call random() the
same value is returned for each row:
```sql
> create table foo as values (1), (2), (3), (4), (5);
0 row(s) fetched.
Elapsed 0.018 seconds.
> select column1, random() from foo;
+---------+--------------------+
| column1 | random() |
+---------+--------------------+
| 1 | 0.9594375709000513 |
| 2 | 0.9594375709000513 |
| 3 | 0.9594375709000513 |
| 4 | 0.9594375709000513 |
| 5 | 0.9594375709000513 |
+---------+--------------------+
5 row(s) fetched.
Elapsed 0.012 seconds.
```
But I expect that each row has a different value for `random()`
However, since none of the tests failed, clearly we have a gap in test
coverage 🤔
_Originally posted by @alamb in
https://github.com/apache/datafusion/pull/10193#discussion_r1576674821_
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