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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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4
test/t/014_hnsw_inserts.pl
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@@ -42,7 +42,7 @@ for my $i (1 .. 20)
my $count = $node->safe_psql("postgres", qq(
SET enable_seqscan = off;
SELECT COUNT(*) FROM (SELECT v FROM tst ORDER BY v <-> (SELECT v FROM tst LIMIT 1)) t;
SELECT COUNT(*) FROM (SELECT v FROM tst ORDER BY v <-> (SELECT v FROM tst LIMIT 1) LIMIT 20) t;
));
is($count, 10);
@@ -63,7 +63,7 @@ $node->pgbench(
my $count = $node->safe_psql("postgres", qq(
SET enable_seqscan = off;
SET hnsw.ef_search = 1000;
SELECT COUNT(*) FROM (SELECT v FROM tst ORDER BY v <-> (SELECT v FROM tst LIMIT 1)) t;
SELECT COUNT(*) FROM (SELECT v FROM tst ORDER BY v <-> (SELECT v FROM tst LIMIT 1) LIMIT 1000) t;
));
# Elements may lose all incoming connections with the HNSW algorithm
# Vacuuming can fix this if one of the elements neighbors is deleted