3 commits

Author	SHA1	Message	Date
Alex Garcia	82f4eb08bf	Add NULL checks after sqlite3_column_blob in rescore and DiskANN ... sqlite3_column_blob() returns NULL for zero-length blobs or on OOM. Several call sites in rescore KNN and DiskANN node/vector read passed the result directly to memcpy without checking, risking NULL deref on corrupt or empty databases. IVF already had proper NULL checks. Adds corruption regression tests that truncate shadow table blobs and verify the query errors cleanly instead of crashing. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>	2026-03-31 14:31:49 -07:00
Alex Garcia	9df59b4c03	Temporarily block vector UPDATE for DiskANN and IVF indexes ... vec0Update_UpdateVectorColumn writes to flat chunk blobs but does not update DiskANN graph or IVF index structures, silently corrupting KNN results. Now returns a clear error for these index types. Rescore UPDATE is unaffected — it already has a full implementation that updates both quantized chunks and float vectors. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>	2026-03-31 14:08:08 -07:00
Alex Garcia	575371d751	Add DiskANN index for vec0 virtual table ... Add DiskANN graph-based index: builds a Vamana graph with configurable R (max degree) and L (search list size, separate for insert/query), supports int8 quantization with rescore, lazy reverse-edge replacement, pre-quantized query optimization, and insert buffer reuse. Includes shadow table management, delete support, KNN integration, compile flag (SQLITE_VEC_ENABLE_DISKANN), release-demo workflow, fuzz targets, and tests. Fixes rescore int8 quantization bug.	2026-03-31 01:21:54 -07:00