--
-- MULTI_TABLE_DDL
--
-- Tests around changing the schema and dropping of a distributed table
CREATE TABLE testtableddl(somecol int, distributecol text NOT NULL);
SELECT master_create_distributed_table('testtableddl', 'distributecol', 'append');
 master_create_distributed_table 
---------------------------------
 
(1 row)

-- verify that the citus extension can't be dropped while distributed tables exist
DROP EXTENSION citus;
ERROR:  cannot drop extension citus because other objects depend on it
DETAIL:  table testtableddl depends on extension citus
HINT:  Use DROP ... CASCADE to drop the dependent objects too.
-- verify that the distribution column can't have its type changed
ALTER TABLE testtableddl ALTER COLUMN distributecol TYPE text;
ERROR:  cannot execute ALTER TABLE command involving partition column
-- verify that the distribution column can't be dropped
ALTER TABLE testtableddl DROP COLUMN distributecol;
ERROR:  cannot execute ALTER TABLE command involving partition column
-- verify that the table cannot be dropped in a transaction block
BEGIN;
DROP TABLE testtableddl;
ERROR:  DROP distributed table cannot run inside a transaction block
CONTEXT:  SQL statement "SELECT master_drop_all_shards(v_obj.objid, v_obj.schema_name, v_obj.object_name)"
PL/pgSQL function citus_drop_trigger() line 15 at PERFORM
ROLLBACK;
-- verify that the table can be dropped
DROP TABLE testtableddl;
-- verify that the table can dropped even if shards exist
CREATE TABLE testtableddl(somecol int, distributecol text NOT NULL);
SELECT master_create_distributed_table('testtableddl', 'distributecol', 'append');
 master_create_distributed_table 
---------------------------------
 
(1 row)

SELECT 1 FROM master_create_empty_shard('testtableddl');
 ?column? 
----------
        1
(1 row)

DROP TABLE testtableddl;
-- ensure no metadata of distributed tables are remaining
SELECT * FROM pg_dist_partition;
 logicalrelid | partmethod | partkey 
--------------+------------+---------
(0 rows)

SELECT * FROM pg_dist_shard;
 logicalrelid | shardid | shardstorage | shardalias | shardminvalue | shardmaxvalue 
--------------+---------+--------------+------------+---------------+---------------
(0 rows)

SELECT * FROM pg_dist_shard_placement;
 shardid | shardstate | shardlength | nodename | nodeport 
---------+------------+-------------+----------+----------
(0 rows)

-- check that the extension now can be dropped (and recreated)
DROP EXTENSION citus;
CREATE EXTENSION citus;