mirror of https://github.com/citusdata/citus.git
65 lines
1.8 KiB
Plaintext
65 lines
1.8 KiB
Plaintext
SELECT columnar_test_helpers.compression_type_supported('lz4') AS lz4_supported \gset
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\if :lz4_supported
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\else
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\q
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\endif
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CREATE SCHEMA am_alz4;
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SET search_path TO am_alz4;
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SET columnar.compression TO 'lz4';
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CREATE TABLE test_lz4 (a int, b text, c int) USING columnar;
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INSERT INTO test_lz4 SELECT floor(i / 1000), floor(i / 10)::text, 4 FROM generate_series(1, 10000) i;
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SELECT count(*) FROM test_lz4;
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count
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---------------------------------------------------------------------
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10000
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(1 row)
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INSERT INTO test_lz4 SELECT floor(i / 2), floor(i / 10)::text, 5 FROM generate_series(1000, 11000) i;
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SELECT count(*) FROM test_lz4;
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count
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---------------------------------------------------------------------
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20001
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(1 row)
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SELECT pg_relation_size('test_lz4') AS size_lz4 \gset
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SELECT DISTINCT * FROM test_lz4 ORDER BY a, b, c LIMIT 5;
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a | b | c
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---------------------------------------------------------------------
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0 | 0 | 4
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0 | 1 | 4
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0 | 10 | 4
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0 | 11 | 4
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0 | 12 | 4
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(5 rows)
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-- compare compression rate to pglz
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SET columnar.compression TO 'pglz';
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CREATE TABLE test_pglz (LIKE test_lz4) USING columnar;
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INSERT INTO test_pglz SELECT * FROM test_lz4;
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SELECT pg_relation_size('test_pglz') AS size_pglz \gset
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-- verify that pglz & lz4 resulted in different compression ratios
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SELECT :size_pglz <> :size_lz4;
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?column?
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---------------------------------------------------------------------
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t
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(1 row)
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-- Other operations
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VACUUM FULL test_lz4;
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ANALYZE test_lz4;
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SELECT count(DISTINCT test_lz4.*) FROM test_lz4;
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count
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---------------------------------------------------------------------
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6002
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(1 row)
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TRUNCATE test_lz4;
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SELECT count(DISTINCT test_lz4.*) FROM test_lz4;
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count
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---------------------------------------------------------------------
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0
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(1 row)
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SET client_min_messages TO WARNING;
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DROP SCHEMA am_alz4 CASCADE;
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