wjones127 opened a new issue, #3764:
URL: https://github.com/apache/arrow-rs/issues/3764
**Is your feature request related to a problem or challenge? Please describe
what you are trying to do.**
I wanted to write some code that was generic over `StructArray` and
`RecordBatch`, but it appears they don't have the same traits (although they
are easily convertible).
It seems like there are many shared methods that could be brought into a
common trait:
* `column()`
* `column_by_name()`
* `columns()`
* `num_columns()`
* `num_rows()`
**Describe the solution you'd like**
I'd propose a trait `ArrowTabular` that has these methods.
**Describe alternatives you've considered**
I'm open to alternatives, but couldn't think of any. In any case, I'm
implementing a trait for my own use case and if folks are open to this I could
upstream it into arrow-rs.
**Additional context**
For context, the thing I am trying to implement is:
```rust
/// Represents a row in an [ArrowTabular].
#[derive(Debug, Clone, Copy)]
struct RowReference<'a, T: ArrowTabular + 'a> {
pub inner: &'a T,
pub pos: usize
}
impl<'a, T: ArrowTabular + 'a> RowReference<'a, T> {
fn get_str(&'a self, col_i: usize) -> Option<&'a str> {
let column = as_string_array(self.inner.column(col_i));
if column.is_null(self.pos) {
None
} else {
Some(column.value(self.pos))
}
}
}
```
This is to help navigate the highly nested schema in [ADBC's GetObjects
output](https://github.com/apache/arrow-adbc/blob/e79edafdb02339664ea735097f8c1edc0ea052de/adbc.h#L815),
where an entry might be a row of a record batch or a row in a struct array,
depending on which level you are at.
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