mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-15 10:52:30 +00:00
22 lines
721 B
MySQL
22 lines
721 B
MySQL
|
SET mutations_sync = 2;
|
||
|
|
|
||
|
|
DROP TABLE IF EXISTS t_sparse_mutations_4;
|
||
|
|
|
||
|
|
CREATE TABLE t_sparse_mutations_4 (k UInt64, v UInt64)
|
||
|
|
ENGINE = MergeTree ORDER BY k
|
||
|
|
SETTINGS ratio_of_defaults_for_sparse_serialization = 0.9;
|
||
|
|
|
||
|
|
INSERT INTO t_sparse_mutations_4 SELECT number, 0 FROM numbers(10000);
|
||
|
|
|
||
|
|
SELECT type, serialization_kind FROM system.parts_columns
|
||
|
|
WHERE database = currentDatabase() AND table = 't_sparse_mutations_4' AND column = 'v' AND active
|
||
|
|
ORDER BY name;
|
||
|
|
|
||
|
|
ALTER TABLE t_sparse_mutations_4 MODIFY COLUMN v String;
|
||
|
|
|
||
|
|
SELECT type, serialization_kind FROM system.parts_columns
|
||
|
|
WHERE database = currentDatabase() AND table = 't_sparse_mutations_4' AND column = 'v' AND active
|
||
|
|
ORDER BY name;
|
||
|
|
|
||
|
|
DROP TABLE t_sparse_mutations_4;
|