yjshen commented on a change in pull request #1905:
URL: https://github.com/apache/arrow-datafusion/pull/1905#discussion_r817933625
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File path: datafusion/src/datasource/object_store/mod.rs
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@@ -39,27 +39,34 @@ use crate::error::{DataFusionError, Result};
/// Note that the dynamic dispatch on the reader might
/// have some performance impacts.
#[async_trait]
-pub trait ObjectReader: Send + Sync {
+pub trait ObjectReader: Read + Seek + Send {
/// Get reader for a part [start, start + length] in the file
asynchronously
async fn chunk_reader(&self, start: u64, length: usize)
-> Result<Box<dyn AsyncRead>>;
- /// Get reader for a part [start, start + length] in the file
- fn sync_chunk_reader(
- &self,
- start: u64,
- length: usize,
- ) -> Result<Box<dyn Read + Send + Sync>>;
-
- /// Get reader for the entire file
- fn sync_reader(&self) -> Result<Box<dyn Read + Send + Sync>> {
- self.sync_chunk_reader(0, self.length() as usize)
- }
Review comment:
After discussions with @houqp and @richox, we agreed that the extra
`chunk` semantic introduced in ObjectReader introduces irrelevant file format
details to object stores and incurs needless complexity. Therefore the API
simplifications.
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