apache / apache/arrow-java

[Java] Support reading a subset of fields from an IPC file or stream

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#242 0 則留言 1 個 reaction 已指派 0 人 在 GitHub 檢視
Type: enhancement
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.*

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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。

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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

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