feat: add Generalized Hash Trie indexes #1502
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…on (#1476) `cargo bench -p benches --bench words_diamond` ``` hydroflow_diamond time: [72.142 ms 72.831 ms 73.535 ms] hydroflo2_diamond_forloop time: [49.023 ms 49.128 ms 49.291 ms] hydroflo2_diamond_iter_clone_chain time: [60.333 ms 60.675 ms 61.171 ms] hydroflo2_diamond_iter_clone_interleave time: [67.000 ms 67.275 ms 67.613 ms] hydroflo2_diamond_iter_buffer_chain time: [62.588 ms 63.017 ms 63.621 ms] hydroflo2_diamond_iter_tee_chain time: [59.979 ms 60.390 ms 60.894 ms] hydroflo2_diamond_iter_tee_interleave time: [62.646 ms 62.937 ms 63.242 ms] hydroflo2_diamond_iter_buffer_one time: [58.574 ms 58.916 ms 59.327 ms] ``` 
Co-authored-by: “Dee <[email protected]> Co-authored-by: Shadaj Laddad <[email protected]>
Instead of `u32`s everywhere, we now have a `ClusterId<C>` type that ensures that cluster IDs are not misused.
The latest Rust Sitter drops the dependency on `tree-sitter-cli`, which eliminates many transitive dependencies.
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Generalized Hash Tries are part of the SIGMOD '23 FreeJoin paper by Wang/Willsey/Suciu. They provide a compressed ("factorized") representation of relations. By operating in the factorized domain, join algorithms can defer cross-products and achieve asymptotically optimal performance.