[Java] Support reading a subset of fields from an IPC file or stream
- 主要語言
- Java
- 星號
- 94
- 分支
- 152
- 平均合併
- 3 天 16 小時
- 30 天內合併 PR
- 11
描述
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.*
貢獻指南
研究方向
從 MessageSerializer 開始,追蹤目前如何從 IPC 檔案和串流中讀取 record batch 訊息。將預期行為與 C++ IpcReadOptions.included_fields 進行比較,然後定義頂層欄位選取應如何運作,並量化不同情境下的 I/O 效益。
由索引模型根據 Issue 內容生成。
評估
- 技術堆疊
- java
- 領域
- data
- Issue 類型
- 功能
- 難度
- 5/5
- 預估耗時
- 一週以上
- 活躍度
- 停滯
- 描述清晰度
- 基本清楚
- 新手友好度
- 30/100