clj-3df
percival
| clj-3df | percival | |
|---|---|---|
| 4 | 12 | |
| 326 | 571 | |
| 0.9% | - | |
| 0.0 | 0.0 | |
| over 4 years ago | about 1 year ago | |
| Clojure | Rust | |
| Eclipse Public License 2.0 | MIT License |
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clj-3df
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Learn Datalog Today
> Datomic has a notion of rules which are mostly syntax sugar and do not support this sort of recursive reasoning.
> Why is that a big deal? When rules are run automatically, you can build live, reactive systems, not just a database that sits around waiting for you to query it.
There was at least one serious attempt to bring these worlds together: https://github.com/sixthnormal/clj-3df
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sixthnormal/clj-3df - pub/sub based on datalog and differential dataflow
It seems there's something of an update to the project status here: https://github.com/sixthnormal/clj-3df/issues/46 It's not actively maintained though there seems to be work on a successor product.
- Clj-3DF: Clojure(Script) Client for Declarative Dataflow
percival
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Learn Datalog Today
Souffle and Cozo mentioned below already implement the whole of "traditional" datalog.
Percival (https://github.com/ekzhang/percival) has some very nice examples showing how you can interactively write and test rules on top of a datalog interpreter.
Bud (http://bloom-lang.net/bud/) is Hellerstein's proof of concept playground. It has bit-rotted in the past few years, but the examples are readable even if you can't easily get it working.
The complexity can be quite good. You can syntactically determine when you've written linear recursion (equivalent to a for loop) vs not. Otherwise, the complexity is what you'd expect from incremental view maintenance in a normal SQL database. Which is to say O(n^k) with k being the number of relations joined, but usually much, much less with appropriate indexes and skew in the data. All the usual tricks concerning data normalization and indexes from databases apply.
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Soufflé: A Datalog Synthesis Tool for Static Analysis
I've worked on percival a bit, it compiles (transpiles?) the datalog ast into javascript code on demand and executes it to get the results, see [1]. Percival's creator, Eric, also submitted a 10m presentation about the project [2] to the HYTRADBOI 'virtual conference' earlier this year [2]. They also submitted a Show HN that received a couple comments [3]. The Have You Tried Rubbing A Database On It conference included several awesome presentations featuring datalog, which readers may find interesting [4].
[1]: https://github.com/ekzhang/percival/blob/main/crates/perciva...
[2]: https://www.hytradboi.com/2022/percival-a-reactive-language-...
[3]: https://news.ycombinator.com/item?id=29521975
[4]: https://www.hytradboi.com/
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Chumsky, a Rust parser-combinator library with error recovery
I haven't written a parser with Chumsky, bit I've played with a little one a bit if you wanna see an example syntax. The error reporting for this project is implemented with `ariadne` which is also really slick.
Parser: https://github.com/ekzhang/percival/blob/main/crates/perciva...
Error reporting: https://github.com/ekzhang/percival/blob/main/crates/perciva...
Datalog playground: https://percival.ink/
To see an error report, delete some punctuation from one of the Datalog code blocks then press shift-return.
- Show HN: Percival – Web-based reactive Datalog notebooks, made with Rust+Svelte
- Percival: Web-based, reactive Datalog notebooks for data analysis and visualization, written in Rust and Svelte
What are some alternatives?
differential-dataflow - An implementation of differential dataflow using timely dataflow on Rust.
codeql - CodeQL: the libraries and queries that power security researchers around the world, as well as code scanning in GitHub Advanced Security
clingo - 🤔 A grounder and solver for logic programs.
crepe - Datalog compiler embedded in Rust as a procedural macro
modus - A language for building Docker/OCI container images
cclyzerpp - cclyzer++ is a precise and scalable pointer analysis for LLVM code.
souffle - Soufflé is a variant of Datalog for tool designers crafting analyses in Horn clauses. Soufflé synthesizes a native parallel C++ program from a logic specification.
async-observable - Async & reactive synchronization model to keep multiple async tasks / threads partially synchronized.
rust - Empowering everyone to build reliable and efficient software.
prql - PRQL is a modern language for transforming data — a simple, powerful, pipelined SQL replacement
instaparse
c-semantics - Semantics of C in K