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Add FTS5-style command column and runtime oversample for rescore

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Replace the old INSERT INTO t(rowid) VALUES('command') hack with a
proper hidden command column named after the table (FTS5 pattern):

  INSERT INTO t(t) VALUES ('oversample=16')

The command column is the first hidden column (before distance and k)
to reserve ability for future table-valued function argument use.

Schema: CREATE TABLE x(rowid, <cols>, "<table>" hidden, distance hidden, k hidden)

For backwards compat, pre-v0.1.10 tables (detected via _info shadow
table version) skip the command column to avoid name conflicts with
user columns that may share the table's name. Verified with legacy
fixture DB generated by sqlite-vec v0.1.6.

Changes:
- Add hidden command column to sqlite3_declare_vtab for new tables
- Version-gate via _info shadow table for existing tables
- Validate at CREATE time that no column name matches table name
- Add rescore_handle_command() with oversample=N support
- rescore_knn() prefers runtime oversample_search over CREATE default
- Remove old rowid-based command dispatch
- Migrate all DiskANN/IVF/fuzz tests and benchmarks to new syntax
- Add legacy DB fixture (v0.1.6) and 9 backwards-compat tests

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Alex Garcia 2026-03-31 22:39:18 -07:00
parent b7fc459be4
commit 6e2c4c6bab
21 changed files with 512 additions and 105 deletions
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8
tests/fuzz/ivf-kmeans.c
View file

@ -64,7 +64,7 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
// Insert vectors
sqlite3_stmt *stmtInsert = NULL;
sqlite3_prepare_v2(db,
"INSERT INTO v(rowid, emb) VALUES (?, ?)", -1, &stmtInsert, NULL);
"INSERT INTO v(v, emb) VALUES (?, ?)", -1, &stmtInsert, NULL);
if (!stmtInsert) { sqlite3_close(db); return 0; }
size_t offset = 0;
@ -125,14 +125,14 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
// Clear centroids and re-compute to test round-trip
sqlite3_exec(db,
"INSERT INTO v(rowid) VALUES ('clear-centroids')",
"INSERT INTO v(v) VALUES ('clear-centroids')",
NULL, NULL, NULL);
// Insert a few more vectors in untrained state
{
sqlite3_stmt *si = NULL;
sqlite3_prepare_v2(db,
"INSERT INTO v(rowid, emb) VALUES (?, ?)", -1, &si, NULL);
"INSERT INTO v(v, emb) VALUES (?, ?)", -1, &si, NULL);
if (si) {
for (int i = 0; i < 3; i++) {
float *vec = sqlite3_malloc(dim * sizeof(float));
@ -150,7 +150,7 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
// Re-train
sqlite3_exec(db,
"INSERT INTO v(rowid) VALUES ('compute-centroids')",
"INSERT INTO v(v) VALUES ('compute-centroids')",
NULL, NULL, NULL);
// Delete some rows after training, then query