ethe commented on PR #6748:
URL: https://github.com/apache/arrow-rs/pull/6748#issuecomment-2485831597
In this case:
```rust
pub struct ArrowReader<'reader, T> {
reader: &'reader T,
}
impl<T: AsyncFileReader + Send + Sync> AsyncFileReader for ArrowReader<'_,
T> {
fn get_bytes(
&mut self,
range: std::ops::Range<usize>,
) -> std::pin::Pin<
Box<dyn std::future::Future<Output =
parquet::errors::Result<bytes::Bytes>> + Send + '_>,
> {
todo!()
}
fn get_metadata(
&mut self,
) -> std::pin::Pin<
Box<
dyn std::future::Future<
Output =
parquet::errors::Result<Arc<parquet::file::metadata::ParquetMetaData>>,
> + Send
+ '_,
>,
> {
todo!()
}
}
fn test<'r, T: AsyncFileReader + Send + Sync>(file: ArrowReader<'r, T>) ->
impl AsyncFileReader {
Box::new(file) as Box<dyn AsyncFileReader>
}
```
`test` function would not pass with currently implementers, after this PR
merged, it would success.
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