rapidsai/cudf

[FEA] Implement Java/JNI function `applyNullMask`

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#16,764 opened on Sep 6, 2024

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JavaSparkfeature requestgood first issue

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Description

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.

Contributor guide

Research direction
Examine the existing copy if else Java/JNI implementation to understand how it currently applies null masks, then create a dedicated applyNullMask function that directly applies a null mask to an input column without requiring a null scalar.
Tech stack
javacpp
Domain
data
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
JavaC++JNI
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
50