Ted-Jiang opened a new issue, #1955:
URL: https://github.com/apache/arrow-rs/issues/1955
**Is your feature request related to a problem or challenge? Please describe
what you are trying to do.**
related to #1775
When i implement page index skipping #1792 , i found
```
/// The ChunkReader trait generates readers of chunks of a source.
/// For a file system reader, each chunk might contain a clone of File
bounded on a given range.
/// For an object store reader, each read can be mapped to a range request.
pub trait ChunkReader: Length + Send + Sync {
type T: Read + Send;
/// get a serialy readeable slice of the current reader
/// This should fail if the slice exceeds the current bounds
fn get_read(&self, start: u64, length: usize) -> Result<Self::T>;
}
```
it assume read whole column chunk bytes array, but when facing like
```
* rows col1 col2 col3
* ┌──────┬──────┬──────┐
* 0 │ p0 │ │ │
* ╞══════╡ p0 │ p0 │
* 20 │ p1(X)│------│------│
* ╞══════╪══════╡ │
* 40 │ p2 │ │------│
* ╞══════╡ p1(X)╞══════╡
* 60 │ p3(X)│ │------│
* ╞══════╪══════╡ │
* 80 │ p4 │ │ p1 │
* ╞══════╡ p2 │ │
* 100 │ p5 │ │ │
* └──────┴──────┴──────┘
```
read `col1` page1 and page3 we need skip other pages
we should pass two offsets
**Describe the solution you'd like**
pass multi strart and length
```
fn get_read(&self, start: vec<u64>, length: vec<usize>) -> Result<Self::T>;
```
**Describe alternatives you've considered**
A clear and concise description of any alternative solutions or features
you've considered.
**Additional context**
Add any other context or screenshots about the feature request here.
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
To unsubscribe, e-mail: [email protected]
For queries about this service, please contact Infrastructure at:
[email protected]
