thisisnic commented on issue #38986:
URL: https://github.com/apache/arrow/issues/38986#issuecomment-6745735467
Confirmed this still reproduces on pyarrow 25.0.1 and Arrow C++ 26.0.1 dev.
Reprex:
```python
import pyarrow as pa, pyarrow.compute as pc
arr = pa.array([["a", "b"]], pa.list_(pa.field("element", pa.string(),
nullable=False)))
pc.binary_join(arr, "-")
# ArrowNotImplementedError: Function 'binary_join' has no kernel matching
input types (list<element: string not null>, string)
```
The kernel is registered with an exact `list<string>` input type in
`AddBinaryJoinForListType` (`scalar_string_ascii.cc`), and exact matching
compares child field nullability, so the non-nullable element type never
matches. Casting to `pa.list_(pa.string())` first works as a workaround. Fix is
to use a type matcher that ignores child nullability.
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