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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 tbl (
record int,
"time" time,
id text
);
INSERT INTO tbl VALUES
(1, '12:00', '[1,2,3]'),
(2, '12:01', '[4,5,6,7]'),
(3, '12:07', '[8,9]');
SELECT DISTINCT record, time, unnest(translate(id, '[]', '{}'):: int[]) AS ids
FROM tbl
ORDER BY record, time, ids;
3 rows affected
| record | time | ids |
|---|---|---|
| 1 | 12:00:00 | 1 |
| 1 | 12:00:00 | 2 |
| 1 | 12:00:00 | 3 |
| 2 | 12:01:00 | 4 |
| 2 | 12:01:00 | 5 |
| 2 | 12:01:00 | 6 |
| 2 | 12:01:00 | 7 |
| 3 | 12:07:00 | 8 |
| 3 | 12:07:00 | 9 |