citus/src/test/regress/expected/create_citus_local_table_ca...

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\set VERBOSITY terse
SET citus.next_shard_id TO 1516000;
SET citus.next_placement_id TO 1516000;
SET citus.shard_replication_factor TO 1;
CREATE SCHEMA citus_add_local_table_to_metadata_cascade;
SET search_path TO citus_add_local_table_to_metadata_cascade;
SET client_min_messages to ERROR;
-- ensure that coordinator is added to pg_dist_node
SELECT 1 FROM master_add_node('localhost', :master_port, groupId => 0);
?column?
---------------------------------------------------------------------
1
(1 row)
CREATE TABLE local_table_1 (col_1 INT UNIQUE);
CREATE TABLE local_table_2 (col_1 INT UNIQUE);
CREATE TABLE local_table_3 (col_1 INT UNIQUE);
CREATE TABLE local_table_4 (col_1 INT UNIQUE);
-- _
-- | |
-- | v
-- local_table_2 -> local_table_1 -> local_table_4
-- ^ | |
-- | v |
-- local_table_3 <--------
ALTER TABLE local_table_2 ADD CONSTRAINT fkey_1 FOREIGN KEY (col_1) REFERENCES local_table_1(col_1);
ALTER TABLE local_table_3 ADD CONSTRAINT fkey_2 FOREIGN KEY (col_1) REFERENCES local_table_1(col_1);
ALTER TABLE local_table_1 ADD CONSTRAINT fkey_3 FOREIGN KEY (col_1) REFERENCES local_table_3(col_1);
ALTER TABLE local_table_1 ADD CONSTRAINT fkey_4 FOREIGN KEY (col_1) REFERENCES local_table_4(col_1);
ALTER TABLE local_table_4 ADD CONSTRAINT fkey_5 FOREIGN KEY (col_1) REFERENCES local_table_3(col_1);
ALTER TABLE local_table_4 ADD CONSTRAINT fkey_6 FOREIGN KEY (col_1) REFERENCES local_table_4(col_1);
-- show that all of below fails as we didn't provide cascade_via_foreign_keys=true
SELECT citus_add_local_table_to_metadata('local_table_1');
ERROR: relation citus_add_local_table_to_metadata_cascade.local_table_1 is involved in a foreign key relationship with another table
SELECT citus_add_local_table_to_metadata('local_table_4', cascade_via_foreign_keys=>false);
ERROR: relation citus_add_local_table_to_metadata_cascade.local_table_4 is involved in a foreign key relationship with another table
-- In each of below two transaction blocks, show that we preserve foreign keys.
-- Also show that we converted all local_table_xxx tables in current schema
-- to citus local tables after citus_add_local_table_to_metadata (cascade).
-- So in each transaction, both selects should return true.
BEGIN;
SELECT conname, conrelid::regclass::text, confrelid::regclass::text
FROM pg_constraint
WHERE connamespace = (SELECT oid FROM pg_namespace WHERE nspname='citus_add_local_table_to_metadata_cascade') AND
conname ~ '^fkey\_\d+$'
ORDER BY 1,2,3;
conname | conrelid | confrelid
---------------------------------------------------------------------
fkey_1 | local_table_2 | local_table_1
fkey_2 | local_table_3 | local_table_1
fkey_3 | local_table_1 | local_table_3
fkey_4 | local_table_1 | local_table_4
fkey_5 | local_table_4 | local_table_3
fkey_6 | local_table_4 | local_table_4
(6 rows)
SELECT citus_add_local_table_to_metadata('local_table_1', cascade_via_foreign_keys=>true);
citus_add_local_table_to_metadata
---------------------------------------------------------------------
(1 row)
-- show that we do sequential execution
show citus.multi_shard_modify_mode;
citus.multi_shard_modify_mode
---------------------------------------------------------------------
sequential
(1 row)
SELECT conname, conrelid::regclass::text, confrelid::regclass::text
FROM pg_constraint
WHERE connamespace = (SELECT oid FROM pg_namespace WHERE nspname='citus_add_local_table_to_metadata_cascade') AND
conname ~ '^fkey\_\d+$'
ORDER BY 1,2,3;
conname | conrelid | confrelid
---------------------------------------------------------------------
fkey_1 | local_table_2 | local_table_1
fkey_2 | local_table_3 | local_table_1
fkey_3 | local_table_1 | local_table_3
fkey_4 | local_table_1 | local_table_4
fkey_5 | local_table_4 | local_table_3
fkey_6 | local_table_4 | local_table_4
(6 rows)
SELECT COUNT(*)=4 FROM pg_dist_partition, pg_tables
WHERE tablename=logicalrelid::regclass::text AND
schemaname='citus_add_local_table_to_metadata_cascade';
?column?
---------------------------------------------------------------------
t
(1 row)
ROLLBACK;
BEGIN;
SELECT citus_add_local_table_to_metadata('local_table_4', cascade_via_foreign_keys=>true);
citus_add_local_table_to_metadata
---------------------------------------------------------------------
(1 row)
SELECT COUNT(*)=6 FROM pg_constraint
WHERE connamespace = (SELECT oid FROM pg_namespace WHERE nspname='citus_add_local_table_to_metadata_cascade') AND
conname ~ '^fkey\_\d+$';
?column?
---------------------------------------------------------------------
t
(1 row)
SELECT COUNT(*)=4 FROM pg_dist_partition, pg_tables
WHERE tablename=logicalrelid::regclass::text AND
schemaname='citus_add_local_table_to_metadata_cascade';
?column?
---------------------------------------------------------------------
t
(1 row)
ROLLBACK;
BEGIN;
CREATE TABLE partitioned_table (col_1 INT REFERENCES local_table_1 (col_1)) PARTITION BY RANGE (col_1);
SELECT citus_add_local_table_to_metadata('local_table_2', cascade_via_foreign_keys=>true);
citus_add_local_table_to_metadata
---------------------------------------------------------------------
(1 row)
ROLLBACK;
BEGIN;
DROP TABLE local_table_2;
-- show that citus_add_local_table_to_metadata(cascade_via_foreign_keys) works fine after
-- dropping one of the relations from foreign key graph
SELECT citus_add_local_table_to_metadata('local_table_1', cascade_via_foreign_keys=>true);
citus_add_local_table_to_metadata
---------------------------------------------------------------------
(1 row)
ROLLBACK;
BEGIN;
-- split local_table_2 from foreign key subgraph
ALTER TABLE local_table_1 DROP CONSTRAINT local_table_1_col_1_key CASCADE;
-- now that local_table_2 does not have any foreign keys, cascade_via_foreign_keys=true
-- is not needed but show that it still works fine
SELECT citus_add_local_table_to_metadata('local_table_2', cascade_via_foreign_keys=>true);
citus_add_local_table_to_metadata
---------------------------------------------------------------------
(1 row)
-- show citus tables in current schema
SELECT tablename FROM pg_dist_partition, pg_tables
WHERE tablename=logicalrelid::regclass::text AND
schemaname='citus_add_local_table_to_metadata_cascade'
ORDER BY 1;
tablename
---------------------------------------------------------------------
local_table_2
(1 row)
ROLLBACK;
BEGIN;
-- split local_table_2 from foreign key subgraph
ALTER TABLE local_table_1 DROP CONSTRAINT local_table_1_col_1_key CASCADE;
-- add a self reference on local_table_2
ALTER TABLE local_table_2 ADD CONSTRAINT fkey_self FOREIGN KEY(col_1) REFERENCES local_table_2(col_1);
-- now that local_table_2 does not have any
-- foreign key relationships with other tables but a self
-- referencing foreign key, cascade_via_foreign_keys=true
-- is not needed but show that it still works fine
SELECT citus_add_local_table_to_metadata('local_table_2', cascade_via_foreign_keys=>true);
citus_add_local_table_to_metadata
---------------------------------------------------------------------
(1 row)
-- show citus tables in current schema
SELECT tablename FROM pg_dist_partition, pg_tables
WHERE tablename=logicalrelid::regclass::text AND
schemaname='citus_add_local_table_to_metadata_cascade'
ORDER BY 1;
tablename
---------------------------------------------------------------------
local_table_2
(1 row)
ROLLBACK;
CREATE TABLE distributed_table(col INT);
SELECT create_distributed_Table('distributed_table', 'col');
create_distributed_table
---------------------------------------------------------------------
(1 row)
BEGIN;
SELECT * FROM distributed_table;
col
---------------------------------------------------------------------
(0 rows)
-- fails as citus_add_local_table_to_metadata would require sequential execution
-- execution like above select
SELECT citus_add_local_table_to_metadata('local_table_4', cascade_via_foreign_keys=>true);
ERROR: cannot modify table "local_table_3" because there was a parallel operation on a distributed table
ROLLBACK;
BEGIN;
set citus.multi_shard_modify_mode to 'sequential';
-- sequetial execution also works fine
SELECT citus_add_local_table_to_metadata('local_table_4', cascade_via_foreign_keys=>true);
citus_add_local_table_to_metadata
---------------------------------------------------------------------
(1 row)
ROLLBACK;
-- test behaviour when outside of transaction block
SELECT citus_add_local_table_to_metadata('local_table_4', cascade_via_foreign_keys=>true);
citus_add_local_table_to_metadata
---------------------------------------------------------------------
(1 row)
-- cleanup at exit
DROP SCHEMA citus_add_local_table_to_metadata_cascade CASCADE;