create table order_line ( id serial primary key, start_date DATE NOT NULL,
end_date DATE, drange daterange NOT NULL GENERATED ALWAYS AS
(daterange(start_date, end_date, '[)')) STORED ); CREATE INDEX
order_line_not_end_idx ON order_line using gist(drange); INSERT INTO
order_line(start_date, end_date) values('2023-01-01', null); INSERT INTO
order_line(start_date, end_date) values('2023-01-01', '2024-01-01'); INSERT
INTO order_line(start_date, end_date) values('2024-01-01', null); INSERT INTO
order_line(start_date, end_date) values('2025-01-01', null); set enable_seqscan
to false; explain analyse select * from order_line WHERE (drange <<
daterange(CURRENT_DATE, NULL, '[)')); -- Uses index
┌────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
│ QUERY PLAN │
├────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ Index Scan using order_line_not_end_idx on order_line (cost=0.14..8.15 rows=1
width=44) (actual time=0.008..0.008 rows=1 loops=1) │ │ Index Cond: (drange <<
daterange(CURRENT_DATE, NULL::date, '[)'::text)) │ │ Planning Time: 0.043 ms │
│ Execution Time: 0.013 ms │
└────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘
explain analyse select * from order_line WHERE NOT (drange <<
daterange(CURRENT_DATE, NULL, '[)')); -- Does not use index
┌─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
│ QUERY PLAN │
├─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┤
│ Seq Scan on order_line (cost=10000000000.00..10000000001.07 rows=3 width=44)
(actual time=0.007..0.008 rows=3 loops=1) │ │ Filter: (NOT (drange <<
daterange(CURRENT_DATE, NULL::date, '[)'::text))) │ │ Rows Removed by Filter: 1
│ │ Planning Time: 0.077 ms │ │ Execution Time: 0.015 ms │
└─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘
--
Andreas Joseph Krogh
CTO / Partner - Visena AS
Mobile: +47 909 56 963
[email protected] <mailto:[email protected]>
www.visena.com <https://www.visena.com>
<https://www.visena.com>
