-- Tags: no-parallel -- no-parallel because the test uses FLUSH ASYNC INSERT QUEUE SET wait_for_async_insert = 0; SET async_insert_busy_timeout_max_ms = 300000; SET async_insert_busy_timeout_min_ms = 300000; SET async_insert_use_adaptive_busy_timeout = 0; DROP TABLE IF EXISTS t_async_insert_alter; CREATE TABLE t_async_insert_alter (id Int64, v1 Int64) ENGINE = MergeTree ORDER BY id SETTINGS async_insert = 1; -- ADD COLUMN INSERT INTO t_async_insert_alter VALUES (42, 24); ALTER TABLE t_async_insert_alter ADD COLUMN value2 Int64; SYSTEM FLUSH ASYNC INSERT QUEUE; SYSTEM FLUSH LOGS; SELECT * FROM t_async_insert_alter ORDER BY id; -- MODIFY COLUMN INSERT INTO t_async_insert_alter VALUES (43, 34, 55); ALTER TABLE t_async_insert_alter MODIFY COLUMN value2 String; SYSTEM FLUSH ASYNC INSERT QUEUE; SYSTEM FLUSH LOGS; SELECT * FROM t_async_insert_alter ORDER BY id; -- DROP COLUMN INSERT INTO t_async_insert_alter VALUES ('100', '200', '300'); ALTER TABLE t_async_insert_alter DROP COLUMN value2; SYSTEM FLUSH ASYNC INSERT QUEUE; SYSTEM FLUSH LOGS; SELECT * FROM t_async_insert_alter ORDER BY id; SELECT query, data_kind, status FROM system.asynchronous_insert_log WHERE database = currentDatabase() AND table = 't_async_insert_alter' ORDER BY event_time_microseconds; DROP TABLE t_async_insert_alter;