Prepare for expanding the number of inner node types#64
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declanvk
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Sep 23, 2025
declanvk
commented
- Add new crate for analyzing key distributions
- Move leaf node to own module
- Rename inner node types
- Move "read full prefix" out of header module
**Description**
Add `blart-analysis` crate with some logic for analyzing key
distributions and optimizing inner node width assignments.
**Motivation**
I'd like to test out possible performance gains when optimizing the
tree representation for specific key distributions.
**Testing Done**
Unit tests, ran:
```bash
cargo run --release --\
--timing \
/home/declan/repos/github/learnedsystems/SOSD/data/books_200M_uint64
```
**Motivation** The `representation.rs` file is pretty large and it is difficult to read at times, this change makes that slightly better.
**Description** - `InnerNodeCompressed` -> `InnerNodeSorted` - `InnerNode48` -> `InnerNodeIndirect` - `InnerNode256` -> `InnerNodeDirect` - Also make `InnerNode48` generic over number of children **Motivation** Renamed the inner node types to focus on their method of lookup, as opposed to the number of child nodes they could contain. Also made `InnerNodeIndirect` to be generic over the number of children so it could be expanded in the future. **Testing Done** `./scripts/full-test.sh nightly`
**Description** Also simplify some of `ltrim_by_with_leaf` code since it was redundant. **Motivation** The `inner_read_full_prefix` function didn't really belong in the header module, since it was mostly concerned with traversing the tree and reading from a descendant leaf node. **Testing Done** `./scripts/full-test.sh nightly`
declanvk
changed the title
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