Squashed 'vendor/ruvector/' content from commit b64c2172

git-subtree-dir: vendor/ruvector
git-subtree-split: b64c21726f2bb37286d9ee36a7869fef60cc6900

crates/ruvector-postgres/sql/access_methods.sql

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+-- ============================================================================
+-- HNSW Access Method
+-- ============================================================================
+
+-- HNSW Access Method Handler
+CREATE OR REPLACE FUNCTION hnsw_handler(internal)
+RETURNS index_am_handler
+AS 'MODULE_PATHNAME', 'hnsw_handler_wrapper'
+LANGUAGE C STRICT;
+
+-- Create HNSW Access Method
+CREATE ACCESS METHOD hnsw TYPE INDEX HANDLER hnsw_handler;
+
+-- ============================================================================
+-- Operator Classes for HNSW
+-- ============================================================================
+
+-- HNSW Operator Class for L2 (Euclidean) distance
+CREATE OPERATOR CLASS ruvector_l2_ops
+    DEFAULT FOR TYPE ruvector USING hnsw AS
+    OPERATOR 1 <-> (ruvector, ruvector) FOR ORDER BY float_ops,
+    FUNCTION 1 ruvector_l2_distance(ruvector, ruvector);
+
+COMMENT ON OPERATOR CLASS ruvector_l2_ops USING hnsw IS
+'ruvector HNSW operator class for L2/Euclidean distance';
+
+-- HNSW Operator Class for Cosine distance
+CREATE OPERATOR CLASS ruvector_cosine_ops
+    FOR TYPE ruvector USING hnsw AS
+    OPERATOR 1 <=> (ruvector, ruvector) FOR ORDER BY float_ops,
+    FUNCTION 1 ruvector_cosine_distance(ruvector, ruvector);
+
+COMMENT ON OPERATOR CLASS ruvector_cosine_ops USING hnsw IS
+'ruvector HNSW operator class for cosine distance';
+
+-- HNSW Operator Class for Inner Product
+CREATE OPERATOR CLASS ruvector_ip_ops
+    FOR TYPE ruvector USING hnsw AS
+    OPERATOR 1 <#> (ruvector, ruvector) FOR ORDER BY float_ops,
+    FUNCTION 1 ruvector_inner_product(ruvector, ruvector);
+
+COMMENT ON OPERATOR CLASS ruvector_ip_ops USING hnsw IS
+'ruvector HNSW operator class for inner product (max similarity)';