[Java] Support reading a subset of fields from an IPC file or stream
- Dominant language
- Java
- Stars
- 94
- Forks
- 152
- Avg merge
- 3d 16h
- Merged PRs (30d)
- 11
Description
C++ supports `IpcReadOptions.included_fields` which lets you load a subset of (top-level) fields from an IPC file or stream, potentially saving on I/O costs. It would be useful to support this in Java as well. Some refactoring would be required since MessageSerializer currently reads record batch messages in as a whole, and it would be good to quantify how much of a benefit this provides in different scenarios.
**Reporter**: [David Li](https://issues.apache.org/jira/browse/ARROW-17914) / @lidavidm
**Note**: *This issue was originally created as [ARROW-17914](https://issues.apache.org/jira/browse/ARROW-17914). Please see the [migration documentation](https://github.com/apache/arrow/issues/14542) for further details.*
Contributor guide
Research direction
Start with MessageSerializer and trace how record batch messages are currently read from IPC files and streams. Compare the desired behavior with C++ IpcReadOptions.included_fields, then define how top-level field selection should work and quantify the I/O benefit across different scenarios.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- java
- Domain
- data
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 30/100