universalmind303 opened a new issue, #9139:
URL: https://github.com/apache/arrow-datafusion/issues/9139
### Is your feature request related to a problem or challenge?
Currently there is no way to express a type signature over a function of
`FixedSizeList<T; N>` where `N` is not constant.
For example, If I have a function that takes in a FixedSizeList of any
length, it's currently impossible to express that through the typesignatures
I'd have to enumerate every number within a range that I want to support.
```rs
let f64_inner = Arc::new(Field::new("item", DataType::Float64, false));
let f64_fsl_1 = DataType::FixedSizeList(f64_inner.clone(), 1);
let f64_fsl_2 = DataType::FixedSizeList(f64_inner.clone(), 2);
let f64_fsl_3 = DataType::FixedSizeList(f64_inner.clone(), 3);
// ...
let sig = Signature::uniform(
2,
vec![
f64_fsl_1,
f64_fsl_2,
f64_fsl_3,
// ...
],
Volatility::Immutable,
);
```
### Describe the solution you'd like
Idk exactly what the solution I would want would look like, but the
ergonomics around `FixedSizeList` could definitely use some improvements.
### Describe alternatives you've considered
enumerating a wide range of potential fixed lengths, or allowing some way to
use List here in the typesignature, but retain fixedsizelist as the actual
type.
### Additional context
I'm trying to make some similarity exprs that take in a uniform
fixedsizelistarray
something like
```sql
cosine_similarity([1.0], [2.0]);
cosine_similarity([1.0, 2.0], [3.0, 4.0]);
cosine_similarity([1.0, 2.0, 3.0], [4.0, 5.0, 6.0]);
cosine_similarity(c1, c2);
cosine_similarity([1.0], c2);
```
the function requires that the values are of the same length, but can be
applied on a fixedsizelist of any arbitrary length.
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