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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(player_id int, points int, ts timestamptz);
INSERT INTO tbl VALUES
(395, 0,'2018-06-01 17:55:23.982413-04')
,(395,100,'2018-06-30 11:05:21.8679-04')
,(395, 0,'2018-07-15 21:56:25.420837-04')
,(395,100,'2018-07-28 19:47:13.84652-04')
,(395, 0,'2018-11-27 17:09:59.384-05')
,(395,100,'2018-12-02 08:56:06.83033-05')
,(399, 0,'2018-05-15 15:28:22.782945-04')
,(399,100,'2018-06-10 12:11:18.041521-04')
,(454, 0,'2018-07-10 18:53:24.236363-04')
,(675, 0,'2018-08-07 20:59:15.510936-04')
,(696, 0,'2018-08-07 19:09:07.126876-04')
,(756,100,'2018-08-15 08:21:11.300871-04')
,(756,100,'2018-08-15 16:43:08.698862-04')
,(756, 0,'2018-08-15 17:22:49.755721-04')
,(756,100,'2018-10-07 15:30:49.27374-04')
,(756, 0,'2018-10-07 15:35:00.975252-04')
,(756, 0,'2018-11-27 19:04:06.456982-05')
,(756,100,'2018-12-02 19:24:20.880022-05')
,(756,100,'2018-12-04 19:57:48.961111-05');
CREATE TABLE
INSERT 0 19
SELECT DISTINCT ON (player_id)
player_id, count(*) AS seq_len, min(ts) AS time_began
FROM (
SELECT player_id, points, ts
, row_number() OVER (PARTITION BY player_id ORDER BY ts)
- row_number() OVER (PARTITION BY player_id, points ORDER BY ts) AS grp
FROM tbl
) sub
WHERE points = 100
GROUP BY player_id, grp -- omit "points" after WHERE points = 100
ORDER BY player_id, seq_len DESC, time_began DESC;
| player_id | seq_len | time_began |
|---|---|---|
| 395 | 1 | 2018-12-02 13:56:06.83033+00 |
| 399 | 1 | 2018-06-10 17:11:18.041521+01 |
| 756 | 2 | 2018-12-03 00:24:20.880022+00 |
SELECT 3