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
