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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 (id int PRIMARY KEY);
CREATE TABLE t2 (id int, t_id int REFERENCES t ON UPDATE CASCADE);
CREATE TABLE t3 (id int, t_id int REFERENCES t ON UPDATE CASCADE);
INSERT INTO t VALUES (1);
INSERT INTO t2 VALUES (1,1);
INSERT INTO t3 VALUES (1,1);
1 rows affected
1 rows affected
1 rows affected
UPDATE t SET id = 42 WHERE id = 1;
1 rows affected
SELECT * FROM t2,t3;
| id | t_id | id | t_id |
|---|---|---|---|
| 1 | 42 | 1 | 42 |