RoaringBitmap/CRoaring

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Roaring bitmaps in C (and C++), with SIMD (AVX2, AVX-512 and NEON) optimizations: used by Apache Doris, ClickHouse, Alibaba Tair, Redpanda, YDB and StarRocks

Stars: 1.9k
Forks: 334
Open beginner issues: 0
Indexed issues: 51
Avg merge: 2d 5h
Merged PRs (30d): 17

Dominant language: C
License: No license data
Last GitHub push: Sep 17, 2026
Latest indexed: Sep 19, 2026
Contributing guide: No contributing guide
Code of conduct: No code of conduct
Beginner labels: help wanted

Beginner friendly Everything

Open All

51 open issues indexed

Complete the Roaring64 C++ API Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

RoaringBitmap/CRoaring#846 · 1 comment · Opened Jul 14, 2026
WASM SIMD128 backend Open

Difficulty 5/5 Over a week Newbie friendliness 45/100

RoaringBitmap/CRoaring#801 · 1 comment · Opened Apr 19, 2026
FreeBSD package Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

RoaringBitmap/CRoaring#777 · 6 comments · 1 reaction · Opened Jan 8, 2026
Add add_offset to cpp headers Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

RoaringBitmap/CRoaring#717 · 1 comment · Opened Jun 14, 2025
Investigate using __vectorcall under Windows Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

RoaringBitmap/CRoaring#689 · Opened Feb 10, 2025
Please update the wget statements in the README.md Open

Difficulty 1/5 Under an hour Newbie friendliness 50/100

RoaringBitmap/CRoaring#687 · 3 comments · Opened Jan 10, 2025
Exposing the roaring64_iterator_t struct in the roaring64 header Open

RoaringBitmap/CRoaring#682 · 12 comments · 1 assignee · Opened Nov 11, 2024
Adding standard-conforming iterators for C++ Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

RoaringBitmap/CRoaring#669 · 4 comments · Opened Sep 30, 2024
Document a policy regarding memory allocation Open

documentation question

Difficulty 5/5 Over a week Newbie friendliness 35/100

RoaringBitmap/CRoaring#638 · 15 comments · Opened Jun 26, 2024
Roaring64 doesn't handle out of memory Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

RoaringBitmap/CRoaring#630 · 9 comments · Opened Jun 2, 2024
Feature request: intersection, union, and difference with the tail of another bitmap Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

RoaringBitmap/CRoaring#591 · 4 comments · Opened Feb 9, 2024
Misc Missing Functionality for Roaring64 bitmaps Open

Difficulty 5/5 Over a week Newbie friendliness 15/100

RoaringBitmap/CRoaring#549 · 9 comments · 3 reactions · Opened Jan 13, 2024
Converting from bitmap/bitarray to roaring bitmap Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

RoaringBitmap/CRoaring#505 · 1 comment · Opened Sep 18, 2023
Debug visualizer for Visual Studio or lldb Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

RoaringBitmap/CRoaring#459 · 3 comments · Opened Mar 31, 2023
Implement the AVX-512 versions of the following functions Open

help wanted

Difficulty 5/5 Over a week Newbie friendliness 30/100

RoaringBitmap/CRoaring#454 · 13 comments · 5 reactions · Opened Mar 27, 2023
Implement Bit-sliced index for CRoaring Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

RoaringBitmap/CRoaring#435 · 7 comments · Opened Feb 11, 2023
Fast/convenient masking operations Open

Difficulty 5/5 Over a week Newbie friendliness 45/100

RoaringBitmap/CRoaring#419 · 2 comments · Opened Dec 25, 2022
fastunion vs |= in a loop Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

RoaringBitmap/CRoaring#417 · 1 comment · Opened Dec 8, 2022
Constant-time cardinality? Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

RoaringBitmap/CRoaring#410 · 2 comments · 4 reactions · Opened Nov 15, 2022
Any interest in a function return number of bytes of memory used by a bitmap? Open

Difficulty 4/5 3-5 days Newbie friendliness 20/100

RoaringBitmap/CRoaring#406 · Opened Nov 13, 2022
Use TLS for big temporary structures Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

RoaringBitmap/CRoaring#370 · 4 comments · Opened Aug 11, 2022
Should we standardize the output of our benchmarks? Open

enhancement question

Difficulty 4/5 3-5 days Newbie friendliness 25/100

RoaringBitmap/CRoaring#346 · 1 comment · Opened Jan 18, 2022
New function proposal: "roaring_move_uint32_iterator_equalorsmaller" Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

RoaringBitmap/CRoaring#344 · 2 comments · Opened Jan 17, 2022
Foreign function friendly iterator request/note Open

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

RoaringBitmap/CRoaring#343 · 1 comment · Opened Jan 17, 2022
Feature Request: Binomial Coefficient Entropy Coding for Inverted Index Postings Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

RoaringBitmap/CRoaring#329 · 5 comments · Opened Dec 14, 2021
How do we feel about Coverity Scan? Open

question

Difficulty 4/5 3-5 days Newbie friendliness 22/100

RoaringBitmap/CRoaring#323 · 5 comments · 1 reaction · Opened Oct 22, 2021
Improve the performance of roaring bitmap under sparse cases Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

RoaringBitmap/CRoaring#319 · 14 comments · Opened Sep 7, 2021
Implement CNF operations Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

RoaringBitmap/CRoaring#308 · 2 comments · Opened Jul 22, 2021
Try a branchless approach for the union of two sorted arrays (array containers) Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

RoaringBitmap/CRoaring#307 · Opened Jul 14, 2021
Use function pointers for runtime dispatching Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

RoaringBitmap/CRoaring#303 · 6 comments · Opened Jun 13, 2021
Fix formatting and add a pipeline that runs the checker Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

RoaringBitmap/CRoaring#301 · 2 comments · Opened Jun 12, 2021
Compute cardinality of multiple unions or intersections at a time Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

RoaringBitmap/CRoaring#298 · 4 comments · Opened Jun 7, 2021
Leverage CUDA library for read operations (GPU enable) Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

RoaringBitmap/CRoaring#233 · 1 reaction · Opened Jul 28, 2020
Roaring64Map's read,write performance is bad Open

RoaringBitmap/CRoaring#225 · 10 comments · 1 assignee · Opened Apr 29, 2020
C++: Make Roaring a hashable class Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

RoaringBitmap/CRoaring#221 · 5 comments · 1 reaction · Opened Feb 17, 2020
Modernize LTO support in CMake Open

enhancement help wanted

Difficulty 2/5 1-3 hours Newbie friendliness 38/100

RoaringBitmap/CRoaring#205 · 1 comment · Opened May 10, 2019
C++ Implementation should support frozen sets. Open

help wanted

Difficulty 4/5 3-5 days Newbie friendliness 20/100

RoaringBitmap/CRoaring#200 · Opened Mar 9, 2019
Test memory allocation robustness Open

help wanted

Difficulty 4/5 3-5 days Newbie friendliness 25/100

RoaringBitmap/CRoaring#182 · 4 comments · Opened Sep 4, 2018
Replace ROARING_DISABLE_AVX and ROARING_DISABLE_NATIVE options Open

help wanted

Difficulty 5/5 Over a week Newbie friendliness 25/100

RoaringBitmap/CRoaring#181 · 1 comment · Opened Aug 31, 2018
cpp headers not in target_include_directories Open

enhancement help wanted

Difficulty 3/5 1-2 days Newbie friendliness 38/100

RoaringBitmap/CRoaring#175 · 1 comment · Opened Jul 31, 2018
Error reporting should be better Open

enhancement help wanted

Difficulty 5/5 Over a week Newbie friendliness 25/100

RoaringBitmap/CRoaring#174 · 5 comments · 2 reactions · Opened Jul 31, 2018
Port "OrderedWriter" from Java for faster RoaringBitmap creation and modification Open

help wanted performance

Difficulty 5/5 Over a week Newbie friendliness 25/100

RoaringBitmap/CRoaring#151 · 2 comments · 2 reactions · Opened Jun 18, 2018
Mismatch in parameter type of binarySearch2 and callee code Open

help wanted

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

RoaringBitmap/CRoaring#134 · 1 comment · Opened Apr 25, 2018
Use SIMD bitset decoding when appropriate Open

help wanted performance

Difficulty 5/5 Over a week Newbie friendliness 25/100

RoaringBitmap/CRoaring#128 · Opened Mar 8, 2018
add fuzz testing Open

help wanted

Difficulty 5/5 Over a week Newbie friendliness 20/100

RoaringBitmap/CRoaring#122 · 18 comments · Opened Jan 31, 2018
Parallelize Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

RoaringBitmap/CRoaring#114 · 2 comments · 1 reaction · Opened Oct 21, 2017
Avoid unnecessary heap allocations Open

help wanted performance

Difficulty 5/5 Over a week Newbie friendliness 25/100

RoaringBitmap/CRoaring#112 · 4 comments · Opened Sep 12, 2017
Mixing roaring bitmaps with different copy_on_write flag values is unsafe Open

enhancement

Difficulty 3/5 1-2 days Newbie friendliness 42/100

RoaringBitmap/CRoaring#97 · 3 comments · Opened Apr 30, 2017
Cleanup headers Open

later

Difficulty 5/5 Over a week Newbie friendliness 25/100

RoaringBitmap/CRoaring#51 · 25 comments · Opened Sep 2, 2016
Gather some test coverage statistics Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 25/100

RoaringBitmap/CRoaring#24 · 5 comments · Opened Apr 20, 2016

RoaringBitmap/CRoaring

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