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Help with an interesting Postgres question: Why isn't an Index Only Scan used on a partition accessed via the parent table?.
version
PostgreSQL 10.23 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 8.5.0 20210514 (Red Hat 8.5.0-15), 64-bit
SELECT 1
CREATE TABLE
CREATE TABLE
CREATE SEQUENCE
INSERT 0 1
INSERT 0 1
INSERT 0 1
INSERT 0 1
INSERT 0 1
INSERT 0 11
id description parent_id cost
1 Cardiology null 0.00
2 Tests null 0.00
3 Cardioversion 1 0.00
4 Ecocardiography 1 0.00
5 Tests 1 0.00
6 Tests 2 0.00
1385 Electric Cardioversion programmed 3 200.00
204 Calcium 5 50.00
1386 Electric Cardioversi on programmed 3 2000.00
7000 Chest Ultrasound 4 100.00
2044 Calcium 6 50.00
SELECT 11