costtest.sql

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CREATE EXTENSION btree_gist;
CREATE EXTENSION pg_trgm;
CREATE EXTENSION bloom;

drop table if exists t1,t2;

CREATE TABLE t1 (
  id text
);

CREATE TABLE t2 (
  id text primary key,
  t1_id text
);

insert into t1 (id)
select i::text FROM generate_series(1, 1500) as i;

insert into t2 (id, t1_id)
SELECT i::text, (i % 1500 + 1)::text FROM generate_series(1, 20000) i;

ANALYZE t1, t2;

SET random_page_cost = 0.00000001;
-- SET random_page_cost = 1.0;
SET enable_hashjoin = off;
SET enable_mergejoin = off;
SET enable_memoize = off;

CREATE INDEX t1_btree_index ON t1 USING btree (id);
explain (analyze, buffers) select * from t1 join t2 on t1.id = t2.t1_id ;
DROP INDEX t1_btree_index;

CREATE INDEX t1_gin_index ON t1 USING gin (id gin_trgm_ops);
explain (analyze, buffers) select * from t1 join t2 on t1.id = t2.t1_id ;
DROP INDEX t1_gin_index;

CREATE INDEX t1_gist_index ON t1 USING gist (id);
explain (analyze, buffers) select * from t1 join t2 on t1.id = t2.t1_id ;
DROP INDEX t1_gist_index;

CREATE INDEX t1_spgist_index ON t1 USING spgist (id);
explain (analyze, buffers) select * from t1 join t2 on t1.id = t2.t1_id ;
DROP INDEX t1_spgist_index;

CREATE INDEX t1_hash_index ON t1 USING hash (id);
explain (analyze, buffers) select * from t1 join t2 on t1.id = t2.t1_id ;
DROP INDEX t1_hash_index;

CREATE INDEX t1_brin_index ON t1 USING brin (id);
explain (analyze, buffers) select * from t1 join t2 on t1.id = t2.t1_id ;
DROP INDEX t1_brin_index;

CREATE INDEX t1_bloom_index ON t1 USING bloom (id);
explain (analyze, buffers) select * from t1 join t2 on t1.id = t2.t1_id ;
DROP INDEX t1_bloom_index;