LiUSemWeb/HeFQUIN

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HeFQUIN is a query federation engine for heterogeneous federations of graph data sources, including federations of knowledge graphs.

Stars: 35
Forks: 3
Open beginner issues: 0
Indexed issues: 27
Avg merge: 2d 4h
Merged PRs (30d): 26

Dominant language: Java
License: Apache-2.0
Last GitHub push: Sep 18, 2026
Latest indexed: Sep 19, 2026
Contributing guide: No contributing guide
Code of conduct: No code of conduct
Beginner labels: good first issue

Beginner friendly Everything

Open All

27 open issues indexed

Implement the use of AuthenticationInformation for GraphQL and Neo4j Open

LiUSemWeb/HeFQUIN#695 · 10 comments · 1 assignee · Opened Aug 31, 2026
Create documentation for caching using HeFQUIN Open

documentation

LiUSemWeb/HeFQUIN#672 · 3 comments · 1 assignee · Opened Aug 13, 2026
SHACL-based validation of federation description Open

LiUSemWeb/HeFQUIN#652 · 1 assignee · Opened Jun 22, 2026
Reduce flag for operators to perform a best-effort duplicate removal Open

enhancement

LiUSemWeb/HeFQUIN#559 · 7 comments · 1 assignee · Opened Mar 26, 2026
SHACL definition of the federation description vocabulary Open

LiUSemWeb/HeFQUIN#537 · 6 comments · 1 assignee · Opened Mar 19, 2026
Verify HTTP client and connection reuse for recurrent calls to the same federation member Open

LiUSemWeb/HeFQUIN#494 · 7 comments · 1 assignee · Opened Jan 29, 2026
Consolidate code for cardinality estimation Open

refactoring

LiUSemWeb/HeFQUIN#468 · 1 assignee · Opened Aug 18, 2025
Represent vocabulary mappings using SSSOM Open

good first issue potential student project

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

LiUSemWeb/HeFQUIN#453 · Opened Jul 2, 2025
Complete the documentation pages Open

documentation

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

LiUSemWeb/HeFQUIN#412 · 3 comments · Opened Apr 8, 2025
Towards v.0.1.0 Open

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

LiUSemWeb/HeFQUIN#348 · 15 comments · Opened Jul 13, 2024
Logical optimization: merge any subsequent pair of l2g and g2l operators Open

enhancement good first issue

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

LiUSemWeb/HeFQUIN#263 · Opened Dec 10, 2022
Determine HTTP query arguments for brTPF requests automatically Open

enhancement

Difficulty 3/5 1-2 days Newbie friendliness 52/100

LiUSemWeb/HeFQUIN#233 · Opened Sep 1, 2022
Determine HTTP query arguments for TPF requests automatically Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 45/100

LiUSemWeb/HeFQUIN#232 · Opened Sep 1, 2022
Rewriting rules for operators related to OPTIONAL Open

enhancement

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

LiUSemWeb/HeFQUIN#216 · Opened Aug 2, 2022
Support new OPTIONAL-related operators in cost model Open

bug

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

LiUSemWeb/HeFQUIN#215 · 1 comment · Opened Aug 2, 2022
Improve parallelism of push-based ExecPlanTask for binary operator Open

performance improvement

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

LiUSemWeb/HeFQUIN#212 · 2 comments · Opened Jul 16, 2022
add toString() to all executable operators Open

good first issue

Difficulty 4/5 3-5 days Newbie friendliness 30/100

LiUSemWeb/HeFQUIN#210 · 2 comments · Opened Jul 9, 2022
implement SchemaMappingImpl Open

LiUSemWeb/HeFQUIN#199 · 4 comments · 1 assignee · Opened Jun 9, 2022
Termination of long-running query executions Open

LiUSemWeb/HeFQUIN#190 · 1 comment · 1 assignee · Opened May 17, 2022
Rewriting rules for filter operator Open

enhancement

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

LiUSemWeb/HeFQUIN#176 · Opened Apr 1, 2022
FILTERBindJoin may produce incomplete results Open

bug

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

LiUSemWeb/HeFQUIN#167 · 1 comment · Opened Mar 23, 2022
Avoid duplicate requests in index nested loops joins Open

performance improvement

Difficulty 4/5 3-5 days Newbie friendliness 42/100

LiUSemWeb/HeFQUIN#147 · 2 comments · Opened Jan 3, 2022
Resizable Cache Data Structure Open

enhancement

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

LiUSemWeb/HeFQUIN#122 · Opened Nov 29, 2021
Data structure to keep track of active queries Open

for paper

LiUSemWeb/HeFQUIN#95 · 1 comment · 1 assignee · Opened Aug 27, 2021
Add helper to perform sequences of paging requests asynchronously Open

performance improvement

LiUSemWeb/HeFQUIN#91 · 1 assignee · Opened Aug 23, 2021
Add a cache for data retrieval responses Open

for paper

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

LiUSemWeb/HeFQUIN#88 · 4 comments · Opened Aug 21, 2021
Preferred block size for bind joins per fed.member Open

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

LiUSemWeb/HeFQUIN#2 · 1 comment · Opened Apr 22, 2021

LiUSemWeb/HeFQUIN

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