SELECT columnar_test_helpers.compression_type_supported('lz4') AS lz4_supported \gset
\if :lz4_supported
\else
\q
\endif
CREATE SCHEMA am_alz4;
SET search_path TO am_alz4;
SET columnar.compression TO 'lz4';
CREATE TABLE test_lz4 (a int, b text, c int) USING columnar;
INSERT INTO test_lz4 SELECT floor(i / 1000), floor(i / 10)::text, 4 FROM generate_series(1, 10000) i;
SELECT count(*) FROM test_lz4;
 count
---------------------------------------------------------------------
 10000
(1 row)

INSERT INTO test_lz4 SELECT floor(i / 2), floor(i / 10)::text, 5 FROM generate_series(1000, 11000) i;
SELECT count(*) FROM test_lz4;
 count
---------------------------------------------------------------------
 20001
(1 row)

SELECT pg_relation_size('test_lz4') AS size_lz4 \gset
SELECT DISTINCT * FROM test_lz4 ORDER BY a, b, c LIMIT 5;
 a | b  | c
---------------------------------------------------------------------
 0 | 0  | 4
 0 | 1  | 4
 0 | 10 | 4
 0 | 11 | 4
 0 | 12 | 4
(5 rows)

-- compare compression rate to pglz
SET columnar.compression TO 'pglz';
CREATE TABLE test_pglz (LIKE test_lz4) USING columnar;
INSERT INTO test_pglz SELECT * FROM test_lz4;
SELECT pg_relation_size('test_pglz') AS size_pglz \gset
-- verify that pglz & lz4 resulted in different compression ratios
SELECT :size_pglz <> :size_lz4;
 ?column?
---------------------------------------------------------------------
 t
(1 row)

-- Other operations
VACUUM FULL test_lz4;
ANALYZE test_lz4;
SELECT count(DISTINCT test_lz4.*) FROM test_lz4;
 count
---------------------------------------------------------------------
  6002
(1 row)

TRUNCATE test_lz4;
SELECT count(DISTINCT test_lz4.*) FROM test_lz4;
 count
---------------------------------------------------------------------
     0
(1 row)

SET client_min_messages TO WARNING;
DROP SCHEMA am_alz4 CASCADE;