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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?.
create table t ( a int, b int, c int, d int) ;
alter table t add unique(b, c);
insert into t (a, b, c, d) values (1, 1, 1, 1), (2, 2, null, 2), (3, 2, null, null);
3 rows affected
select * from t;
| a | b | c | d |
|---|---|---|---|
| 1 | 1 | 1 | 1 |
| 2 | 2 | null | 2 |
| 3 | 2 | null | null |