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Simple implementation for aggregation functions. The code added is purposely so that we can add things like `CEILING(avg(n))` in the future. Aggregation function impose a higher level of complexity that requires us to plan ahead several things: * simple avg: `select avg(id) from users` * nested avg: `select ceiling(avg(id)) from users` * avg with other columns: `select ceiling(avg(id)), * from users` (yes, this is valid sqllite). For now I'm nullifying extra columns for simplicity. * avg with other agg functions: `select avg(id), sum(id) from users`. This should be supported. * At last -- Order By is a painful enough case to treat alone (not done in this pr) Signed-off-by: Pere Diaz Bou <pere-altea@hotmail.com>
Limbo
Limbo is a work-in-progress, in-process OLTP database management system, compatible with SQLite.
Features
- In-process OLTP database engine library
- Asynchronous I/O support with
io_uring - SQLite compatibility
- SQL dialect support (wip)
- File format support (read-only)
- SQLite C API (wip)
- JavaScript/WebAssembly bindings (wip)
Getting Started
Limbo is currently read-only. You can either use the sqlite3 program to create a database:
$ sqlite3 database.db
SQLite version 3.42.0 2023-05-16 12:36:15
Enter ".help" for usage hints.
sqlite> CREATE TABLE users (id INT PRIMARY KEY, username TEXT);
sqlite> INSERT INTO users VALUES (1, 'alice');
sqlite> INSERT INTO users VALUES (2, 'bob');
or use the testing script to generate one for you:
./testing/gen-database.py
You can then start the Limbo shell with:
$ cargo run database.db
Welcome to Limbo SQL shell!
> SELECT * FROM users LIMIT 1;
|1|Cody|Miller|mhurst@example.org|525.595.7319x21268|33667 Shaw Extension Suite 104|West Robert|VA|45161|`
Developing
Run tests:
cargo test
Test coverage report:
cargo tarpaulin -o html
Run benchmarks:
cargo bench
Run benchmarks and generate flamegraphs:
echo -1 | sudo tee /proc/sys/kernel/perf_event_paranoid
cargo bench --bench benchmark -- --profile-time=5
Publications
- Pekka Enberg, Sasu Tarkoma, Jon Crowcroft Ashwin Rao (2024). Serverless Runtime / Database Co-Design With Asynchronous I/O. In EdgeSys ‘24. [PDF]
- Pekka Enberg, Sasu Tarkoma, and Ashwin Rao (2023). Towards Database and Serverless Runtime Co-Design. In CoNEXT-SW ’23. [PDF] [Slides]
License
This project is licensed under the MIT license.
Contribution
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in Limbo by you, shall be licensed as MIT, without any additional terms or conditions.