mirror of
https://github.com/pgvector/pgvector.git
synced 2026-07-05 12:10:55 +08:00
61 lines
1.7 KiB
Perl
61 lines
1.7 KiB
Perl
use strict;
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use warnings FATAL => 'all';
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use PostgreSQL::Test::Cluster;
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use PostgreSQL::Test::Utils;
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use Test::More;
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my @dims = (384, 1536);
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my $limit = 10;
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# Initialize node
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my $node = PostgreSQL::Test::Cluster->new('node');
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$node->init;
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$node->start;
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$node->safe_psql("postgres", "CREATE EXTENSION vector;");
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for my $dim (@dims)
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{
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my $array_sql = join(",", ('random()') x $dim);
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# Create table and index
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$node->safe_psql("postgres", "CREATE TABLE tst (i int4, v vector($dim));");
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$node->safe_psql("postgres",
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"INSERT INTO tst SELECT i, ARRAY[$array_sql] FROM generate_series(1, 2000) i;"
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);
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$node->safe_psql("postgres", "CREATE INDEX idx ON tst USING hnsw (v vector_l2_ops);");
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$node->safe_psql("postgres", "ANALYZE tst;");
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# Generate query
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my @r = ();
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for (1 .. $dim)
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{
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push(@r, rand());
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}
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my $query = "[" . join(",", @r) . "]";
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my $explain = $node->safe_psql("postgres", qq(
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EXPLAIN ANALYZE SELECT i FROM tst ORDER BY v <-> '$query' LIMIT $limit;
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));
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like($explain, qr/Index Scan using idx/);
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# 3x the rows are needed for distance filters
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# since the planner uses DEFAULT_INEQ_SEL for the selectivity (should be 1)
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# Recreate index for performance
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$node->safe_psql("postgres", "DROP INDEX idx;");
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$node->safe_psql("postgres",
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"INSERT INTO tst SELECT i, ARRAY[$array_sql] FROM generate_series(2001, 6000) i;"
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);
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$node->safe_psql("postgres", "CREATE INDEX idx ON tst USING hnsw (v vector_l2_ops);");
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$node->safe_psql("postgres", "ANALYZE tst;");
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$explain = $node->safe_psql("postgres", qq(
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EXPLAIN ANALYZE SELECT i FROM tst WHERE v <-> '$query' < 1 ORDER BY v <-> '$query' LIMIT $limit;
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));
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like($explain, qr/Index Scan using idx/);
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$node->safe_psql("postgres", "DROP TABLE tst;");
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}
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done_testing();
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