jp0317 opened a new pull request, #36192: URL: https://github.com/apache/arrow/pull/36192
### Rationale for this change The current FileReader can only work in one of the two modes, coalescing (when Prebuffer is called) and non-coalescing (when Prefufer is not called), due to the if statement [here](https://github.com/apache/arrow/blob/main/cpp/src/parquet/file_reader.cc#L203) Since Prebuffer is basically caching all specified column chunks, it would raise concerns on memory usage for systems with tight memory budget. In such scenarios, one may want to Prebuffer some small chunks while being able to read the rest chunks using BufferedInputStream. ### What changes are included in this PR? Changes to support partial prebuffer on a subset of column chunks and a unit test ### Are these changes tested? Yes. ### Are there any user-facing changes? No. -- 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]
