154 lines
5.5 KiB
SQL
154 lines
5.5 KiB
SQL
\set HIDE_TOAST_COMPRESSION false
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-- ensure we get stable results regardless of installation's default
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SET default_toast_compression = 'pglz';
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-- test creating table with compression method
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CREATE TABLE cmdata(f1 text COMPRESSION pglz);
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CREATE INDEX idx ON cmdata(f1);
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INSERT INTO cmdata VALUES(repeat('1234567890', 1000));
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\d+ cmdata
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CREATE TABLE cmdata1(f1 TEXT COMPRESSION lz4);
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INSERT INTO cmdata1 VALUES(repeat('1234567890', 1004));
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\d+ cmdata1
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-- verify stored compression method in the data
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SELECT pg_column_compression(f1) FROM cmdata;
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SELECT pg_column_compression(f1) FROM cmdata1;
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-- decompress data slice
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SELECT SUBSTR(f1, 200, 5) FROM cmdata;
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SELECT SUBSTR(f1, 2000, 50) FROM cmdata1;
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-- copy with table creation
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SELECT * INTO cmmove1 FROM cmdata;
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\d+ cmmove1
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SELECT pg_column_compression(f1) FROM cmmove1;
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-- copy to existing table
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CREATE TABLE cmmove3(f1 text COMPRESSION pglz);
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INSERT INTO cmmove3 SELECT * FROM cmdata;
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INSERT INTO cmmove3 SELECT * FROM cmdata1;
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SELECT pg_column_compression(f1) FROM cmmove3;
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-- test LIKE INCLUDING COMPRESSION
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CREATE TABLE cmdata2 (LIKE cmdata1 INCLUDING COMPRESSION);
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\d+ cmdata2
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DROP TABLE cmdata2;
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-- try setting compression for incompressible data type
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CREATE TABLE cmdata2 (f1 int COMPRESSION pglz);
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-- update using datum from different table
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CREATE TABLE cmmove2(f1 text COMPRESSION pglz);
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INSERT INTO cmmove2 VALUES (repeat('1234567890', 1004));
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SELECT pg_column_compression(f1) FROM cmmove2;
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UPDATE cmmove2 SET f1 = cmdata1.f1 FROM cmdata1;
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SELECT pg_column_compression(f1) FROM cmmove2;
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-- test externally stored compressed data
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CREATE OR REPLACE FUNCTION large_val() RETURNS TEXT LANGUAGE SQL AS
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'select array_agg(fipshash(g::text))::text from generate_series(1, 256) g';
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CREATE TABLE cmdata2 (f1 text COMPRESSION pglz);
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INSERT INTO cmdata2 SELECT large_val() || repeat('a', 4000);
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SELECT pg_column_compression(f1) FROM cmdata2;
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INSERT INTO cmdata1 SELECT large_val() || repeat('a', 4000);
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SELECT pg_column_compression(f1) FROM cmdata1;
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SELECT SUBSTR(f1, 200, 5) FROM cmdata1;
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SELECT SUBSTR(f1, 200, 5) FROM cmdata2;
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DROP TABLE cmdata2;
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--test column type update varlena/non-varlena
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CREATE TABLE cmdata2 (f1 int);
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\d+ cmdata2
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ALTER TABLE cmdata2 ALTER COLUMN f1 TYPE varchar;
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\d+ cmdata2
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ALTER TABLE cmdata2 ALTER COLUMN f1 TYPE int USING f1::integer;
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\d+ cmdata2
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--changing column storage should not impact the compression method
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--but the data should not be compressed
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ALTER TABLE cmdata2 ALTER COLUMN f1 TYPE varchar;
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ALTER TABLE cmdata2 ALTER COLUMN f1 SET COMPRESSION pglz;
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\d+ cmdata2
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ALTER TABLE cmdata2 ALTER COLUMN f1 SET STORAGE plain;
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\d+ cmdata2
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INSERT INTO cmdata2 VALUES (repeat('123456789', 800));
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SELECT pg_column_compression(f1) FROM cmdata2;
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-- test compression with materialized view
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CREATE MATERIALIZED VIEW compressmv(x) AS SELECT * FROM cmdata1;
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\d+ compressmv
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SELECT pg_column_compression(f1) FROM cmdata1;
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SELECT pg_column_compression(x) FROM compressmv;
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-- test compression with partition
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CREATE TABLE cmpart(f1 text COMPRESSION lz4) PARTITION BY HASH(f1);
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CREATE TABLE cmpart1 PARTITION OF cmpart FOR VALUES WITH (MODULUS 2, REMAINDER 0);
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CREATE TABLE cmpart2(f1 text COMPRESSION pglz);
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ALTER TABLE cmpart ATTACH PARTITION cmpart2 FOR VALUES WITH (MODULUS 2, REMAINDER 1);
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INSERT INTO cmpart VALUES (repeat('123456789', 1004));
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INSERT INTO cmpart VALUES (repeat('123456789', 4004));
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SELECT pg_column_compression(f1) FROM cmpart1;
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SELECT pg_column_compression(f1) FROM cmpart2;
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-- test compression with inheritance, error
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CREATE TABLE cminh() INHERITS(cmdata, cmdata1);
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CREATE TABLE cminh(f1 TEXT COMPRESSION lz4) INHERITS(cmdata);
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-- test default_toast_compression GUC
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SET default_toast_compression = '';
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SET default_toast_compression = 'I do not exist compression';
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SET default_toast_compression = 'lz4';
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SET default_toast_compression = 'pglz';
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-- test alter compression method
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ALTER TABLE cmdata ALTER COLUMN f1 SET COMPRESSION lz4;
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INSERT INTO cmdata VALUES (repeat('123456789', 4004));
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\d+ cmdata
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SELECT pg_column_compression(f1) FROM cmdata;
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ALTER TABLE cmdata2 ALTER COLUMN f1 SET COMPRESSION default;
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\d+ cmdata2
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-- test alter compression method for materialized views
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ALTER MATERIALIZED VIEW compressmv ALTER COLUMN x SET COMPRESSION lz4;
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\d+ compressmv
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-- test alter compression method for partitioned tables
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ALTER TABLE cmpart1 ALTER COLUMN f1 SET COMPRESSION pglz;
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ALTER TABLE cmpart2 ALTER COLUMN f1 SET COMPRESSION lz4;
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-- new data should be compressed with the current compression method
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INSERT INTO cmpart VALUES (repeat('123456789', 1004));
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INSERT INTO cmpart VALUES (repeat('123456789', 4004));
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SELECT pg_column_compression(f1) FROM cmpart1;
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SELECT pg_column_compression(f1) FROM cmpart2;
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-- VACUUM FULL does not recompress
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SELECT pg_column_compression(f1) FROM cmdata;
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VACUUM FULL cmdata;
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SELECT pg_column_compression(f1) FROM cmdata;
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-- test expression index
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DROP TABLE cmdata2;
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CREATE TABLE cmdata2 (f1 TEXT COMPRESSION pglz, f2 TEXT COMPRESSION lz4);
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CREATE UNIQUE INDEX idx1 ON cmdata2 ((f1 || f2));
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INSERT INTO cmdata2 VALUES((SELECT array_agg(fipshash(g::TEXT))::TEXT FROM
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generate_series(1, 50) g), VERSION());
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-- check data is ok
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SELECT length(f1) FROM cmdata;
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SELECT length(f1) FROM cmdata1;
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SELECT length(f1) FROM cmmove1;
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SELECT length(f1) FROM cmmove2;
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SELECT length(f1) FROM cmmove3;
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CREATE TABLE badcompresstbl (a text COMPRESSION I_Do_Not_Exist_Compression); -- fails
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CREATE TABLE badcompresstbl (a text);
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ALTER TABLE badcompresstbl ALTER a SET COMPRESSION I_Do_Not_Exist_Compression; -- fails
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DROP TABLE badcompresstbl;
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\set HIDE_TOAST_COMPRESSION true
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