taepper opened a new issue, #51210: URL: https://github.com/apache/arrow/issues/51210
### Describe the bug, including details regarding any error messages,
version, and platform.
If an input `Table` or `ChunkedArray` is empty, the `SelectKthInternal`
function have the following early return:
```
if (num_rows == 0) {
return Status::OK();
}
```
Crucially, `output_` is never set in these cases. Therefore,
`SelectKUnstable`'s `make_array()` call:
```
Result<std::shared_ptr<Array>> SelectKUnstable(const Datum& datum, ...) {
ARROW_ASSIGN_OR_RAISE(Datum result,
CallFunction("select_k_unstable", {datum},
&options, ctx));
return result.make_array();
}
```
will fail this `DCHECK_EQ`:
```
std::shared_ptr<Array> Datum::make_array() const {
DCHECK_EQ(Datum::ARRAY, this->kind());
return MakeArray(std::get<std::shared_ptr<ArrayData>>(this->value));
}
```
This can also be reproduced in python code by calling `select_k_unstable`
with an empty `ChunkedArray` or `Table` respectively
### Component(s)
C++
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