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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?.
select version();
| version |
|---|
| PostgreSQL 16.0 (Debian 16.0-1.pgdg120+1) on x86_64-pc-linux-gnu, compiled by gcc (Debian 12.2.0-14) 12.2.0, 64-bit |
SELECT 1
create table my_data (
id integer,
value text,
start_date date,
end_date date
);
insert into my_data values
(1,'ABC', '2024-01-29', '2024-02-01'),
(2,'XYZ', '2024-02-28', '2024-03-01');
CREATE TABLE
INSERT 0 2
select
d.id,
d.value,
gs::DATE
from my_data d,
lateral generate_series(d.start_date, d.end_date, '1 day') gs
| id | value | gs |
|---|---|---|
| 1 | ABC | 2024-01-29 |
| 1 | ABC | 2024-01-30 |
| 1 | ABC | 2024-01-31 |
| 1 | ABC | 2024-02-01 |
| 2 | XYZ | 2024-02-28 |
| 2 | XYZ | 2024-02-29 |
| 2 | XYZ | 2024-03-01 |
SELECT 7