rdettai edited a comment on pull request #8300:
URL: https://github.com/apache/arrow/pull/8300#issuecomment-713467151
I agree that this PR is hanging, but as this is an API change, I guess its
better to think things through before moving forward! 😄 This should maybe have
been prepared in a design document rather than in the PR... 😅
Its true that most of the time you will have the length around from an other
source. But shouldn't we prefer a trait that contains exactly the minimum
amount of information we need to make the `FileReader` implem work ?
Proposition:
```
pub enum ChunkMode {
FromStart(u64),
FromEnd(u64),
}
pub trait ChunkReader {
type T: Read + Length;
fn get_read(&self, start: ChunkMode, length: usize) -> Result<Self::T>;
}
```
I can have the implem ready by the end of the day!
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