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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 9
product_id color_id
1 1
1 2
1 3
2 1
2 3
2 5
3 2
3 3
4 4
SELECT 9
INSERT 0 5
product_id color_id
1 2
2 1
2 3
3 2
3 3
1 4
1 5
2 2
4 1
5 3
SELECT 10