universalmind303 opened a new issue, #9138:
URL: https://github.com/apache/arrow-datafusion/issues/9138
### Describe the bug
flatten only supports `List` not `FixedSizeList`
### To Reproduce
```sql
select flatten(some_fixed_size_list;
Error: Internal error: Not reachable, data_type should be List.
This was likely caused by a bug in DataFusion's code and we would welcome
that you file an bug report in our issue tracker
```
### Expected behavior
flatten behaves the same on both `List` and `FixedSizeList`
### Additional context
```rs
BuiltinScalarFunction::Flatten => {
fn get_base_type(data_type: &DataType) -> Result<DataType> {
match data_type {
DataType::List(field) => match field.data_type() {
DataType::List(_) =>
get_base_type(field.data_type()),
_ => Ok(data_type.to_owned()),
},
_ => internal_err!("Not reachable, data_type should
be List"),
}
}
let data_type = get_base_type(&input_expr_types[0])?;
Ok(data_type)
}
```
probably just need to add a branch here for `FixedSizeList`
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