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Filter deleted nodes from DiskANN search results and add delete tests

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DiskANN's delete repair only fixes forward edges (nodes the deleted
node pointed to). Stale reverse edges can cause deleted rowids to
appear in search results. Fix: track a 'confirmed' flag on each
search candidate, set when the full-precision vector is successfully
read during re-ranking. Only confirmed candidates are included in
output. Zero additional SQL queries — piggybacks on the existing
re-rank vector read.

Also adds delete hardening tests:
- Rescore: interleaved delete+KNN, rowid_in after deletes, full
  delete+reinsert cycle
- DiskANN: delete+reinsert cycles with KNN verification, interleaved
  delete+KNN

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Alex Garcia 2026-03-31 17:13:29 -07:00
parent 2f4c2e4bdb
commit b00865429b
4 changed files with 190 additions and 8 deletions
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sqlite-vec.c
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@ -2586,7 +2586,8 @@ struct Vec0DiskannConfig {
struct Vec0DiskannCandidate {
i64 rowid;
f32 distance;
int visited; // 1 if this candidate's neighbors have been explored
int visited; // 1 if this candidate's neighbors have been explored
int confirmed; // 1 if full-precision vector was successfully read (node exists)
};
/**