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f89fd07c5b
This changes the license text for SQL files to be identical with the license text for C files.
57 lines
2.7 KiB
SQL
57 lines
2.7 KiB
SQL
-- This file and its contents are licensed under the Apache License 2.0.
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-- Please see the included NOTICE for copyright information and
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-- LICENSE-APACHE for a copy of the license.
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CREATE TABLE regular_table(name text, junk text);
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CREATE TABLE ht(time timestamptz NOT NULL, location text);
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SELECT create_hypertable('ht', 'time');
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INSERT INTO ht(time) select timestamp 'epoch' + (i * interval '1 second') from generate_series(1, 100) as T(i);
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INSERT INTO regular_table values('name', 'junk');
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SELECT * FROM regular_table ik LEFT JOIN LATERAL (select max(time::timestamptz) from ht s where ik.name='name' and s.time < now()) s on true;
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select * from regular_table ik LEFT JOIN LATERAL (select max(time::timestamptz) from ht s where ik.name='name' and s.time > now()) s on true;
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DROP TABLE regular_table;
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DROP TABLE ht;
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CREATE TABLE orders(id int, user_id int, time TIMESTAMPTZ NOT NULL);
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SELECT create_hypertable('orders', 'time');
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INSERT INTO orders values(1,1,timestamp 'epoch' + '1 second');
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INSERT INTO orders values(2,1,timestamp 'epoch' + '2 second');
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INSERT INTO orders values(3,1,timestamp 'epoch' + '3 second');
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INSERT INTO orders values(4,2,timestamp 'epoch' + '4 second');
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INSERT INTO orders values(5,1,timestamp 'epoch' + '5 second');
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INSERT INTO orders values(6,3,timestamp 'epoch' + '6 second');
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INSERT INTO orders values(7,1,timestamp 'epoch' + '7 second');
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INSERT INTO orders values(8,4,timestamp 'epoch' + '8 second');
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INSERT INTO orders values(9,2,timestamp 'epoch' + '9 second');
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-- Need a LATERAL query with a reference to the upper-level table and
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-- with a restriction on time
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-- Upper-level table constraint should be a constant in order to trigger
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-- creation of a one-time filter in the planner
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SELECT user_id, first_order_time, max_time FROM
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(SELECT user_id, min(time) AS first_order_time FROM orders GROUP BY user_id) o1
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LEFT JOIN LATERAL
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(SELECT max(time) AS max_time FROM orders WHERE o1.user_id = '2' AND time > now()) o2 ON true
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ORDER BY user_id, first_order_time, max_time;
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SELECT user_id, first_order_time, max_time FROM
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(SELECT user_id, min(time) AS first_order_time FROM orders GROUP BY user_id) o1
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LEFT JOIN LATERAL
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(SELECT max(time) AS max_time FROM orders WHERE o1.user_id = '2' AND time < now()) o2 ON true
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ORDER BY user_id, first_order_time, max_time;
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-- Nested LATERALs
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SELECT user_id, first_order_time, time1, min_time FROM
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(SELECT user_id, min(time) AS first_order_time FROM orders GROUP BY user_id) o1
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LEFT JOIN LATERAL
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(SELECT user_id as o2user_id, time AS time1 FROM orders WHERE o1.user_id = '2' AND time < now()) o2 ON true
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LEFT JOIN LATERAL
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(SELECT min(time) as min_time FROM orders WHERE o2.o2user_id = '1' AND time < now()) o3 ON true
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ORDER BY user_id, first_order_time, time1, min_time;
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-- Cleanup
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DROP TABLE orders;
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