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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 mytable (
id int,
amount1 int,
amount2 int,
amount3 int
);
INSERT INTO mytable VALUES
(1,10,0,3),
(1,20,1,1),
(2,5,2,2),
(2,0,3,11);
SELECT * FROM mytable;
CREATE TABLE
INSERT 0 4
| id | amount1 | amount2 | amount3 |
|---|---|---|---|
| 1 | 10 | 0 | 3 |
| 1 | 20 | 1 | 1 |
| 2 | 5 | 2 | 2 |
| 2 | 0 | 3 | 11 |
SELECT 4
SELECT
id,
SUM(amount1),
SUM(amount2),
SUM(amount3)
FROM
mytable
GROUP BY GROUPING SETS ((id, amount1, amount2, amount3),(id))
ORDER BY id
| id | sum | sum | sum |
|---|---|---|---|
| 1 | 10 | 0 | 3 |
| 1 | 20 | 1 | 1 |
| 1 | 30 | 1 | 4 |
| 2 | 5 | 2 | 2 |
| 2 | 0 | 3 | 11 |
| 2 | 5 | 5 | 13 |
SELECT 6