rapidsai/cudf

[FEA] Implement Java/JNI function `applyNullMask`

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#16,764 创建于 2024年9月6日

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feature requestgood first issue

描述

We need a function in Java/JNI to apply a null mask onto some provided input column. This functionality is used a lot in Spark-rapids plugin.

Currently, we can achieve this using copy_if_else but we have to create and provide a null scalar for the else (if not valid) option, which is a bit inconvenient and incurs additional maintenance overhead.

贡献者指南

技术栈
javacpp
领域
backenddata
议题类型
feature
难度面向新贡献者的预计实现难度，1 表示很小改动，5 表示专家级工作。
3
预计时间有经验贡献者完成调查、实现、测试并准备 pull request 的粗略时间范围。
1-2 days
活动状态议题当前的可参与程度：新鲜、活跃、陈旧、阻塞或等待维护者输入。
fresh
清晰度议题是否清楚说明期望改动、验收标准和下一步。
clear
前置要求
JavaC++JNIcuDF codebase
新手友好度1-100 的估计分数，表示该议题对首次贡献者的友好程度。
40
研究方向
Investigate existing JNI functions in the cudf Java bindings to understand the pattern. Look at the current use of copy if else to see how null mask is applied. Propose a new JNI function that applies null mask directly, possibly by modifying existing code. Discuss with maintainers on the issue thread for any design preferences.
[FEA] Implement Java/JNI function `applyNullMask` · rapidsai/cudf#16764 | Good First Issue