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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
INSERT 0 1
INSERT 0 1
INSERT 0 1
INSERT 0 1
INSERT 0 1
INSERT 0 1
INSERT 0 1
INSERT 0 1
INSERT 0 1
INSERT 0 1
INSERT 0 1
INSERT 0 1
INSERT 0 1
INSERT 0 1
INSERT 0 1
CREATE TABLE
INSERT 0 15
UPDATE 15
id parent_id tree_id_path
13 1 -5-1
14 13 -5-1-13
15 2 -5-2
3 1 -5-1
5 0
4 3 -5-1-3
1 5 -5
2 5 -5
6 2 -5-2
7 3 -5-1-3
8 2 -5-2
9 5 -5
10 1 -5-1
11 10 -5-1-10
12 10 -5-1-10
SELECT 15