mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-07 23:12:34 +00:00
32 lines
1.3 KiB
Plaintext
32 lines
1.3 KiB
Plaintext
-- { echoOn }
|
|
DROP TABLE IF EXISTS visits_order;
|
|
DROP TABLE IF EXISTS visits_order_dst;
|
|
CREATE TABLE visits_order
|
|
(
|
|
user_id UInt64,
|
|
user_name String,
|
|
some_int UInt64
|
|
) ENGINE = MergeTree() PRIMARY KEY user_id PARTITION BY user_id;
|
|
CREATE TABLE visits_order_dst
|
|
(
|
|
user_id UInt64,
|
|
user_name String,
|
|
some_int UInt64
|
|
) ENGINE = MergeTree() PRIMARY KEY user_id PARTITION BY user_id;
|
|
ALTER TABLE visits_order ADD PROJECTION user_name_projection (SELECT * ORDER BY user_name);
|
|
ALTER TABLE visits_order_dst ADD PROJECTION user_name_projection (SELECT * ORDER BY user_name);
|
|
INSERT INTO visits_order SELECT 2, 'user2', number from numbers(1, 10);
|
|
INSERT INTO visits_order SELECT 2, 'another_user2', number*2 from numbers(1, 10);
|
|
INSERT INTO visits_order SELECT 2, 'yet_another_user2', number*3 from numbers(1, 10);
|
|
ALTER TABLE visits_order_dst ATTACH PARTITION ID '2' FROM visits_order;
|
|
SET allow_experimental_analyzer=0;
|
|
EXPLAIN SELECT * FROM visits_order_dst WHERE user_name='another_user2';
|
|
Expression ((Projection + Before ORDER BY))
|
|
Filter
|
|
ReadFromMergeTree (user_name_projection)
|
|
SET allow_experimental_analyzer=1;
|
|
EXPLAIN SELECT * FROM visits_order_dst WHERE user_name='another_user2';
|
|
Expression ((Project names + Projection))
|
|
Filter
|
|
ReadFromMergeTree (user_name_projection)
|