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https://github.com/pgvector/pgvector.git
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75 lines
2.0 KiB
SQL
75 lines
2.0 KiB
SQL
SET enable_seqscan = off;
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-- L2
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CREATE TABLE t (val halfvec(3));
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INSERT INTO t (val) VALUES ('[0,0,0]'), ('[1,2,3]'), ('[1,1,1]'), (NULL);
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CREATE INDEX ON t USING ivfflat (val halfvec_l2_ops) WITH (lists = 1);
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INSERT INTO t (val) VALUES ('[1,2,4]');
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SELECT * FROM t ORDER BY val <-> '[3,3,3]';
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SELECT COUNT(*) FROM (SELECT * FROM t ORDER BY val <-> (SELECT NULL::halfvec)) t2;
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SELECT COUNT(*) FROM t;
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TRUNCATE t;
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SELECT * FROM t ORDER BY val <-> '[3,3,3]';
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DROP TABLE t;
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-- inner product
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CREATE TABLE t (val halfvec(3));
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INSERT INTO t (val) VALUES ('[0,0,0]'), ('[1,2,3]'), ('[1,1,1]'), (NULL);
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CREATE INDEX ON t USING ivfflat (val halfvec_ip_ops) WITH (lists = 1);
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INSERT INTO t (val) VALUES ('[1,2,4]');
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SELECT * FROM t ORDER BY val <#> '[3,3,3]';
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SELECT COUNT(*) FROM (SELECT * FROM t ORDER BY val <#> (SELECT NULL::halfvec)) t2;
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DROP TABLE t;
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-- cosine
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CREATE TABLE t (val halfvec(3));
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INSERT INTO t (val) VALUES ('[0,0,0]'), ('[1,2,3]'), ('[1,1,1]'), (NULL);
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CREATE INDEX ON t USING ivfflat (val halfvec_cosine_ops) WITH (lists = 1);
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INSERT INTO t (val) VALUES ('[1,2,4]');
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SELECT * FROM t ORDER BY val <=> '[3,3,3]';
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SELECT COUNT(*) FROM (SELECT * FROM t ORDER BY val <=> '[0,0,0]') t2;
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SELECT COUNT(*) FROM (SELECT * FROM t ORDER BY val <=> (SELECT NULL::halfvec)) t2;
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DROP TABLE t;
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-- dimensions
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CREATE TABLE t (val halfvec(4000));
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CREATE INDEX ON t USING ivfflat (val halfvec_l2_ops);
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DROP TABLE t;
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CREATE TABLE t (val halfvec(4001));
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CREATE INDEX ON t USING ivfflat (val halfvec_l2_ops);
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DROP TABLE t;
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-- memory
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CREATE TABLE t (val halfvec(4000));
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CREATE INDEX ON t USING ivfflat (val halfvec_l2_ops) WITH (lists = 8192);
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DROP TABLE t;
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SET maintenance_work_mem = '1MB';
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CREATE TABLE t (val halfvec(4000));
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CREATE INDEX ON t USING ivfflat (val halfvec_l2_ops);
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DROP TABLE t;
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RESET maintenance_work_mem;
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SET maintenance_work_mem = '6MB';
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CREATE TABLE t (val halfvec(4000));
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INSERT INTO t (val) VALUES (array_fill(0, ARRAY[4000]));
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CREATE INDEX ON t USING ivfflat (val halfvec_l2_ops);
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DROP TABLE t;
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RESET maintenance_work_mem;
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