dadepo commented on issue #8866:
URL:
https://github.com/apache/arrow-datafusion/issues/8866#issuecomment-1913613142
Switch the implementation to `ScalarUDFImpl` and the documentation says:
```
/// # Zero Argument Functions
/// If the function has zero parameters (e.g. `now()`) it will be passed
a
/// single element slice which is a a null array to indicate the batch's
row
/// count (so the function can know the resulting array size).
```
See
https://github.com/apache/arrow-datafusion/blob/51b898288830c224b825523f9be1d54974f15d2f/datafusion/expr/src/udf.rs#L257
When I dbg! the args passed to the a zero parameter UDF I am implementing, I
get
```
&args = [
Scalar(
NULL,
),
]
```
Which suggests to me, that a Scalar value is being passed, and not an Array
as suggested in the documentation, and hence the length cannot be deduced from
this.
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