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Lance's scanner defaults to prefilter=false: a filter riding the same scanner as nearest()/bm25() is applied AFTER the ANN/FTS top-k, so `limit k` meant top-k of the whole table and a selective predicate silently starved results (the deny-list's silent-partial-result shape; measured by the nearest-prefilter bench scenario: 20k rows, s=0.05, k=10 -> 1000 matching rows exist, 0 returned). Set prefilter(true) whenever a structured filter is pushed to the scanner: one flag governs both the vector and FTS sources, plain scans ignore it, and it re-enables scalar-index acceleration for the predicate under nearest. The red test turns green: filtered nearest now returns the top-k of MATCHING rows. Docs state the filters-before-search contract explicitly (docs/user/search/index.md). Closes iss-nearest-postfilter-starves-results. |
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| deployment.md | ||
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