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Filtered top-k search on the dynamic Vamana index via the search builder - #442
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yuejiaointel wants to merge 20 commits into
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Reuse the MutableBuffer valid/invalid mechanism: a FilteredValidBuilder marks an entry invalid if it is deleted or the predicate rejects its external id. New MutableVamanaIndex::search overload taking a predicate, padding rows with id -1 / +inf and returning per-query found counts. Supplement path checks the predicate before computing the distance. Orchestrator virtual appended last.
Replace the separate filtered search overload with two optional trailing arguments on MutableVamanaIndex::search (an id predicate and a per-query result count). Without a predicate the existing code path runs unchanged. check_and_supplement_search_buffer gets an optional predicate that is checked before the distance is computed. The filter predicate type is now a type-erased std::function, so FilteredValidBuilder is no longer a template. The orchestrator keeps one appended virtual that forwards to the index search.
The optional filter on MutableVamanaIndex::search now only chooses which builder the existing greedy search closure uses; both cases call the same per_thread_batch_search. FilteredValidBuilder derives from ValidBuilder. The buffer top-up in single_search applies the filter when the search closure carries one. The per-query result count out-parameter is removed (callers count non-padding ids). per_thread_batch_search now pads result rows with fewer than k entries (id size_t(-1), distance +inf) instead of reading past the end of the search buffer, and the post-search id translation skips the padding.
Give ValidBuilder an optional predicate and pass it down through internal_search_builder, greedy_search_closure and search() as optional arguments, instead of a separate builder and search path. Filtered-only checks: the supplement fallback skips failing ids, copy-out pads short rows with id -1 and the worst score, translation skips padded ids.
The orchestrator reports filtered search as unsupported for indexes whose search has no filter argument (the concurrent index), instead of failing to compile. In the filtered test, drop the unfiltered-padding section (padding is filtered-only) and add an inner-product case checking padding uses -inf.
This was referenced Oct 23, 2026
ValidBuilder can be given the search buffer. With a filter, it first asks the buffer whether the entry would be dropped anyway (can_skip) and, if so, returns it as invalid without looking up the external id or calling the filter. Results are unchanged.
… drop" This reverts commit 1ecd4e8.
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Closing: experiment concluded; the work continues in #456. |
This reverts commit a389cf8.
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What this changes
cleanup()drops them before results are returned.ValidBuildernow also marks a node invalid when it fails the filter. Filtered top-k search is then the normal greedy search with one extra check per node.ValidBuilder<bool Filtered = false>. Regular search (Filtered == false) has no filter check.filterargument of the existingMutableVamanaIndex::search(). The search buffer,greedy_search, the static index and the batch iterator are unchanged.Files
include/svs/index/vamana/dynamic_index.h:ValidBuilder<Filtered>;search()takes the optional filter and runs its per-thread body for the filtered or the regular case.include/svs/index/vamana/extensions.h: the top-up step uses the filter and rows with fewer than k passing entries are padded with idsize_t(-1)and the worst score.include/svs/orchestrators/dynamic_vamana.h:DynamicVamana::filtered_search(appended last in the interface). Returns false if the index'ssearchhas no filter argument (e.g. the concurrent index).Notes
Tests
Existing tests plus the filtered-search test in
tests/svs/index/vamana/dynamic_index.cpp.Results
Not benchmarked yet for this version.
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