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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 14.10 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 8.5.0 20210514 (Red Hat 8.5.0-20), 64-bit |
SELECT 1
create table t(x varchar(100))
CREATE TABLE
insert into t
select 'This is ' || cast(x.* as varchar(20)) || ' string'
from generate_series(1,20) x
INSERT 0 20
select * from t
| x |
|---|
| This is 1 string |
| This is 2 string |
| This is 3 string |
| This is 4 string |
| This is 5 string |
| This is 6 string |
| This is 7 string |
| This is 8 string |
| This is 9 string |
| This is 10 string |
| This is 11 string |
| This is 12 string |
| This is 13 string |
| This is 14 string |
| This is 15 string |
| This is 16 string |
| This is 17 string |
| This is 18 string |
| This is 19 string |
| This is 20 string |
SELECT 20