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Do not use index if large % of tuples will be filtered unless unless enable_seqscan = off

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This commit is contained in:
Andrew Kane
2024-01-20 20:43:27 -08:00
parent 490522b883
commit 6a9eb2e355
2 changed files with 34 additions and 1 deletions
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7
test/t/018_hnsw_filtering.pl
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@@ -36,7 +36,12 @@ my $c = int(rand() * $nc);
my $explain = $node->safe_psql("postgres", qq(
EXPLAIN ANALYZE SELECT i FROM tst WHERE c = $c ORDER BY v <-> '$query' LIMIT $limit;
));
# TODO Do not use index
like($explain, qr/Seq Scan/);
# Test attribute filtering with few rows removed
$explain = $node->safe_psql("postgres", qq(
EXPLAIN ANALYZE SELECT i FROM tst WHERE c != $c ORDER BY v <-> '$query' LIMIT $limit;
));
like($explain, qr/Index Scan using idx/);
# Test distance filtering