databendlabs/databend

Feature: Implement HybridBitmap deserialization calculation based on RoaringFormatSpec

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#19,101 opened on Dec 14, 2025

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Description

Summary

RoaringFormatSpec describes the serialization specification for RoaringBitmap, which may allow for direct computation by using serialized bytes, avoiding deserialization.

ref: https://github.com/RoaringBitmap/RoaringFormatSpec/?tab=readme-ov-file#general-layout

Contributor guide

Research direction
Read the RoaringFormatSpec and explore how HybridBitmap is currently serialized/deserialized in the databend codebase. Identify places where direct computation from serialized bytes could replace full deserialization.
Tech stack
rust
Domain
database
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.
1-2 days
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
RustGit
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30