mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-11 01:54:55 +00:00
40 lines
1.4 KiB
SQL
40 lines
1.4 KiB
SQL
DROP TABLE IF EXISTS null_subcolumns;
|
|
|
|
SELECT 'Nullable';
|
|
CREATE TABLE null_subcolumns (id UInt32, n Nullable(String)) ENGINE = MergeTree ORDER BY id;
|
|
|
|
INSERT INTO null_subcolumns VALUES (1, 'foo') (2, NULL) (3, NULL) (4, 'abc');
|
|
|
|
SELECT count() FROM null_subcolumns WHERE n.null;
|
|
SELECT count() FROM null_subcolumns PREWHERE n.null;
|
|
|
|
-- Check, that subcolumns will be available after restart.
|
|
DETACH TABLE null_subcolumns;
|
|
ATTACH TABLE null_subcolumns;
|
|
|
|
SELECT count() FROM null_subcolumns WHERE n.null;
|
|
SELECT count() FROM null_subcolumns PREWHERE n.null;
|
|
|
|
DROP TABLE null_subcolumns;
|
|
DROP TABLE IF EXISTS map_subcolumns;
|
|
|
|
SELECT 'Map';
|
|
SET allow_experimental_map_type = 1;
|
|
CREATE TABLE map_subcolumns (id UInt32, m Map(String, UInt32)) ENGINE = MergeTree ORDER BY id;
|
|
INSERT INTO map_subcolumns VALUES (1, map('a', 1, 'b', 2)) (2, map('a', 3, 'c', 4)), (3, map('b', 5, 'c', 6, 'd', 7));
|
|
|
|
SELECT count() FROM map_subcolumns WHERE has(m.keys, 'a');
|
|
SELECT count() FROM map_subcolumns PREWHERE has(m.keys, 'b');
|
|
|
|
SELECT count() FROM map_subcolumns WHERE arrayMax(m.values) > 3;
|
|
SELECT count() FROM map_subcolumns PREWHERE arrayMax(m.values) > 3;
|
|
|
|
DETACH TABLE map_subcolumns;
|
|
ATTACH TABLE map_subcolumns;
|
|
|
|
SELECT count() FROM map_subcolumns WHERE has(m.keys, 'a');
|
|
SELECT count() FROM map_subcolumns PREWHERE has(m.keys, 'b');
|
|
|
|
SELECT id, m.size0 FROM map_subcolumns;
|
|
SELECT count() FROM map_subcolumns WHERE m.size0 > 2;
|