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https://github.com/timescale/timescaledb.git
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e947c6be3a
This PR adds better handling for the following commands: * ALTER TABLE ... ALTER COLUMN ... SET (attribute_name = value) * ALTER TABLE ... ALTER COLUMN ... RESET (attribute_name) * ALTER TABLE ... ALTER COLUMN ... SET STATISTICS * ALTER TABLE ... ALTER COLUMN ... SET STORAGE For each of the above commands the associated settings are not properly propagated to existing chunks and new chunks are created with the same settings as the hypertable. We also now allow these commands to be run on chunks.
92 lines
3.9 KiB
SQL
92 lines
3.9 KiB
SQL
-- DROP a table's column before making it a hypertable
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CREATE TABLE alter_before(id serial, time timestamp, temp float, colorid integer, notes text, notes_2 text);
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ALTER TABLE alter_before DROP COLUMN id;
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ALTER TABLE alter_before ALTER COLUMN temp SET (n_distinct = 10);
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ALTER TABLE alter_before ALTER COLUMN colorid SET (n_distinct = 11);
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ALTER TABLE alter_before ALTER COLUMN colorid RESET (n_distinct);
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ALTER TABLE alter_before ALTER COLUMN temp SET STATISTICS 100;
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ALTER TABLE alter_before ALTER COLUMN notes SET STORAGE EXTERNAL;
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SELECT create_hypertable('alter_before', 'time', chunk_time_interval => 2628000000000);
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INSERT INTO alter_before VALUES ('2017-03-22T09:18:22', 23.5, 1);
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SELECT * FROM alter_before;
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-- Show that deleted column is marked as dropped and that attnums are
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-- now different for the root table and the chunk
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SELECT c.relname, a.attname, a.attnum, a.attoptions, a.attstattarget, a.attstorage FROM pg_attribute a, pg_class c
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WHERE a.attrelid = c.oid
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AND (c.relname LIKE '_hyper_1%_chunk' OR c.relname = 'alter_before')
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AND a.attnum > 0
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ORDER BY c.relname, a.attnum;
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-- DROP a table's column after making it a hypertable and having data
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CREATE TABLE alter_after(id serial, time timestamp, temp float, colorid integer, notes text, notes_2 text);
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SELECT create_hypertable('alter_after', 'time', chunk_time_interval => 2628000000000);
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-- Create first chunk
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INSERT INTO alter_after (time, temp, colorid) VALUES ('2017-03-22T09:18:22', 23.5, 1);
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ALTER TABLE alter_after DROP COLUMN id;
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ALTER TABLE alter_after ALTER COLUMN temp SET (n_distinct = 10);
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ALTER TABLE alter_after ALTER COLUMN colorid SET (n_distinct = 11);
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ALTER TABLE alter_after ALTER COLUMN colorid RESET (n_distinct);
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ALTER TABLE alter_after ALTER COLUMN colorid SET STATISTICS 101;
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ALTER TABLE alter_after ALTER COLUMN notes_2 SET STORAGE EXTERNAL;
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-- Creating new chunks after dropping a column should work just fine
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INSERT INTO alter_after VALUES ('2017-03-22T09:18:23', 21.5, 1),
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('2017-05-22T09:18:22', 36.2, 2),
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('2017-05-22T09:18:23', 15.2, 2);
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-- Make sure tuple conversion also works with COPY
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\COPY alter_after FROM 'data/alter.tsv' NULL AS '';
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-- Data should look OK
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SELECT * FROM alter_after;
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-- Show that attnums are different for chunks created after DROP
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-- column
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SELECT c.relname, a.attname, a.attnum FROM pg_attribute a, pg_class c
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WHERE a.attrelid = c.oid
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AND (c.relname LIKE '_hyper_2%_chunk' OR c.relname = 'alter_after')
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AND a.attnum > 0
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ORDER BY c.relname, a.attnum;
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-- Add an ID column again
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ALTER TABLE alter_after ADD COLUMN id serial;
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INSERT INTO alter_after (time, temp, colorid) VALUES ('2017-08-22T09:19:14', 12.5, 3);
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--test thing that we are allowed to do on chunks
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ALTER TABLE _timescaledb_internal._hyper_2_3_chunk ALTER COLUMN temp RESET (n_distinct);
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ALTER TABLE _timescaledb_internal._hyper_2_4_chunk ALTER COLUMN temp SET (n_distinct = 20);
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ALTER TABLE _timescaledb_internal._hyper_2_4_chunk ALTER COLUMN temp SET STATISTICS 201;
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ALTER TABLE _timescaledb_internal._hyper_2_4_chunk ALTER COLUMN notes SET STORAGE EXTERNAL;
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SELECT c.relname, a.attname, a.attnum, a.attoptions, a.attstattarget, a.attstorage FROM pg_attribute a, pg_class c
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WHERE a.attrelid = c.oid
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AND (c.relname LIKE '_hyper_2%_chunk' OR c.relname = 'alter_after')
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AND a.attnum > 0
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ORDER BY c.relname, a.attnum;
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SELECT * FROM alter_after;
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-- Need superuser to ALTER chunks in _timescaledb_internal schema
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\c single :ROLE_SUPERUSER
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SELECT * FROM _timescaledb_catalog.chunk WHERE id = 2;
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-- Rename chunk
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ALTER TABLE _timescaledb_internal._hyper_2_2_chunk RENAME TO new_chunk_name;
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SELECT * FROM _timescaledb_catalog.chunk WHERE id = 2;
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-- Set schema
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ALTER TABLE _timescaledb_internal.new_chunk_name SET SCHEMA public;
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SELECT * FROM _timescaledb_catalog.chunk WHERE id = 2;
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-- Test that we cannot rename chunk columns
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\set ON_ERROR_STOP 0
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ALTER TABLE public.new_chunk_name RENAME COLUMN time TO newtime;
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\set ON_ERROR_STOP 1
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