231 lines
5.2 KiB
Plaintext
231 lines
5.2 KiB
Plaintext
CREATE EXTENSION bloom;
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CREATE TABLE tst (
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i int4,
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t text
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);
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INSERT INTO tst SELECT i%10, substr(encode(sha256(i::text::bytea), 'hex'), 1, 1) FROM generate_series(1,2000) i;
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CREATE INDEX bloomidx ON tst USING bloom (i, t) WITH (col1 = 3);
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ALTER INDEX bloomidx SET (length=80);
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SET enable_seqscan=on;
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SET enable_bitmapscan=off;
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SET enable_indexscan=off;
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SELECT count(*) FROM tst WHERE i = 7;
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count
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-------
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200
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(1 row)
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SELECT count(*) FROM tst WHERE t = '5';
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count
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-------
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126
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(1 row)
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SELECT count(*) FROM tst WHERE i = 7 AND t = '5';
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count
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-------
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14
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(1 row)
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SET enable_seqscan=off;
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SET enable_bitmapscan=on;
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SET enable_indexscan=on;
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EXPLAIN (COSTS OFF) SELECT count(*) FROM tst WHERE i = 7;
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QUERY PLAN
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-------------------------------------------
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Aggregate
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-> Bitmap Heap Scan on tst
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Recheck Cond: (i = 7)
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-> Bitmap Index Scan on bloomidx
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Index Cond: (i = 7)
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(5 rows)
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EXPLAIN (COSTS OFF) SELECT count(*) FROM tst WHERE t = '5';
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QUERY PLAN
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-------------------------------------------
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Aggregate
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-> Bitmap Heap Scan on tst
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Recheck Cond: (t = '5'::text)
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-> Bitmap Index Scan on bloomidx
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Index Cond: (t = '5'::text)
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(5 rows)
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EXPLAIN (COSTS OFF) SELECT count(*) FROM tst WHERE i = 7 AND t = '5';
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QUERY PLAN
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---------------------------------------------------------
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Aggregate
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-> Bitmap Heap Scan on tst
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Recheck Cond: ((i = 7) AND (t = '5'::text))
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-> Bitmap Index Scan on bloomidx
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Index Cond: ((i = 7) AND (t = '5'::text))
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(5 rows)
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SELECT count(*) FROM tst WHERE i = 7;
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count
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-------
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200
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(1 row)
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SELECT count(*) FROM tst WHERE t = '5';
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count
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-------
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126
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(1 row)
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SELECT count(*) FROM tst WHERE i = 7 AND t = '5';
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count
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-------
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14
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(1 row)
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DELETE FROM tst;
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INSERT INTO tst SELECT i%10, substr(encode(sha256(i::text::bytea), 'hex'), 1, 1) FROM generate_series(1,2000) i;
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VACUUM ANALYZE tst;
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SELECT count(*) FROM tst WHERE i = 7;
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count
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-------
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200
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(1 row)
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SELECT count(*) FROM tst WHERE t = '5';
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count
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-------
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126
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(1 row)
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SELECT count(*) FROM tst WHERE i = 7 AND t = '5';
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count
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-------
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14
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(1 row)
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DELETE FROM tst WHERE i > 1 OR t = '5';
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VACUUM tst;
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INSERT INTO tst SELECT i%10, substr(encode(sha256(i::text::bytea), 'hex'), 1, 1) FROM generate_series(1,2000) i;
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SELECT count(*) FROM tst WHERE i = 7;
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count
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-------
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200
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(1 row)
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SELECT count(*) FROM tst WHERE t = '5';
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count
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-------
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126
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(1 row)
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SELECT count(*) FROM tst WHERE i = 7 AND t = '5';
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count
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-------
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14
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(1 row)
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VACUUM FULL tst;
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SELECT count(*) FROM tst WHERE i = 7;
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count
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-------
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200
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(1 row)
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SELECT count(*) FROM tst WHERE t = '5';
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count
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-------
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126
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(1 row)
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SELECT count(*) FROM tst WHERE i = 7 AND t = '5';
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count
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-------
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14
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(1 row)
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-- Try an unlogged table too
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CREATE UNLOGGED TABLE tstu (
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i int4,
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t text
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);
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INSERT INTO tstu SELECT i%10, substr(encode(sha256(i::text::bytea), 'hex'), 1, 1) FROM generate_series(1,2000) i;
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CREATE INDEX bloomidxu ON tstu USING bloom (i, t) WITH (col2 = 4);
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SET enable_seqscan=off;
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SET enable_bitmapscan=on;
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SET enable_indexscan=on;
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EXPLAIN (COSTS OFF) SELECT count(*) FROM tstu WHERE i = 7;
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QUERY PLAN
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--------------------------------------------
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Aggregate
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-> Bitmap Heap Scan on tstu
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Recheck Cond: (i = 7)
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-> Bitmap Index Scan on bloomidxu
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Index Cond: (i = 7)
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(5 rows)
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EXPLAIN (COSTS OFF) SELECT count(*) FROM tstu WHERE t = '5';
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QUERY PLAN
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--------------------------------------------
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Aggregate
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-> Bitmap Heap Scan on tstu
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Recheck Cond: (t = '5'::text)
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-> Bitmap Index Scan on bloomidxu
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Index Cond: (t = '5'::text)
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(5 rows)
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EXPLAIN (COSTS OFF) SELECT count(*) FROM tstu WHERE i = 7 AND t = '5';
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QUERY PLAN
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---------------------------------------------------------
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Aggregate
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-> Bitmap Heap Scan on tstu
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Recheck Cond: ((i = 7) AND (t = '5'::text))
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-> Bitmap Index Scan on bloomidxu
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Index Cond: ((i = 7) AND (t = '5'::text))
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(5 rows)
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SELECT count(*) FROM tstu WHERE i = 7;
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count
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-------
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200
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(1 row)
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SELECT count(*) FROM tstu WHERE t = '5';
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count
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-------
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126
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(1 row)
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SELECT count(*) FROM tstu WHERE i = 7 AND t = '5';
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count
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-------
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14
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(1 row)
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RESET enable_seqscan;
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RESET enable_bitmapscan;
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RESET enable_indexscan;
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-- Run amvalidator function on our opclasses
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SELECT opcname, amvalidate(opc.oid)
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FROM pg_opclass opc JOIN pg_am am ON am.oid = opcmethod
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WHERE amname = 'bloom'
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ORDER BY 1;
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opcname | amvalidate
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----------+------------
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int4_ops | t
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text_ops | t
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(2 rows)
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--
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-- relation options
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--
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DROP INDEX bloomidx;
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CREATE INDEX bloomidx ON tst USING bloom (i, t) WITH (length=7, col1=4);
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SELECT reloptions FROM pg_class WHERE oid = 'bloomidx'::regclass;
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reloptions
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-------------------
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{length=7,col1=4}
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(1 row)
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-- check for min and max values
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\set VERBOSITY terse
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CREATE INDEX bloomidx2 ON tst USING bloom (i, t) WITH (length=0);
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ERROR: value 0 out of bounds for option "length"
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CREATE INDEX bloomidx2 ON tst USING bloom (i, t) WITH (col1=0);
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ERROR: value 0 out of bounds for option "col1"
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