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Updated cost estimation to not use index when expected tuples is too low

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This commit is contained in:
Andrew Kane
2024-01-21 12:39:57 -08:00
parent 91acc3c178
commit f133e841b5
25 changed files with 223 additions and 50 deletions
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6
test/expected/ivfflat_l2.out
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@@ -3,7 +3,7 @@ CREATE TABLE t (val vector(3));
INSERT INTO t (val) VALUES ('[0,0,0]'), ('[1,2,3]'), ('[1,1,1]'), (NULL);
CREATE INDEX ON t USING ivfflat (val vector_l2_ops) WITH (lists = 1);
INSERT INTO t (val) VALUES ('[1,2,4]');
SELECT * FROM t ORDER BY val <-> '[3,3,3]';
SELECT * FROM t ORDER BY val <-> '[3,3,3]' LIMIT 5;
val
---------
[1,2,3]
@@ -12,7 +12,7 @@ SELECT * FROM t ORDER BY val <-> '[3,3,3]';
[0,0,0]
(4 rows)
SELECT * FROM t ORDER BY val <-> (SELECT NULL::vector);
SELECT * FROM t ORDER BY val <-> (SELECT NULL::vector) LIMIT 5;
val
---------
[0,0,0]
@@ -31,7 +31,7 @@ TRUNCATE t;
NOTICE: ivfflat index created with little data
DETAIL: This will cause low recall.
HINT: Drop the index until the table has more data.
SELECT * FROM t ORDER BY val <-> '[3,3,3]';
SELECT * FROM t ORDER BY val <-> '[3,3,3]' LIMIT 5;
val
-----
(0 rows)