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27 lines
601 B
Plaintext
27 lines
601 B
Plaintext
SET enable_seqscan = off;
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CREATE TABLE t (val vector(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 vector_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]' LIMIT 5;
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val
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---------
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[1,1,1]
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[1,2,3]
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[1,2,4]
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(3 rows)
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SELECT COUNT(*) FROM (SELECT * FROM t ORDER BY val <=> '[0,0,0]' LIMIT 5) t2;
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count
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-------
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3
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(1 row)
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SELECT COUNT(*) FROM (SELECT * FROM t ORDER BY val <=> (SELECT NULL::vector) LIMIT 5) t2;
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count
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-------
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3
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(1 row)
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DROP TABLE t;
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