Rust: Implement Vectors of Unions

Description

Contributor guide

Tech stack

rustcpp

Domain

backenddataapi

Issue type

feature

DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.

4

Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.

over 1 week

Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.

stale

ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.

needs investigation

Prerequisites

Rust programmingFlatBuffers schema knowledgeUnderstanding of unions in serialization

Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.

25

Research direction

The issue requests implementing vectors of unions in Rust FlatBuffers, aiming for parity with C++ and Java implementations. Review the existing Rust codegen in src/idl gen rust.cpp and test files under tests/rust usage test. Examine comments for prior discussion on design decisions, particularly around union table handling. The lack of an assignee or linked PR suggests this is an open research problem; contributors should analyze how C++ and Java handle union vectors in their respective codegens and propose a similar Rust implementation.