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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
CREATE TABLE
INSERT 0 4
INSERT 0 7
customer_id date amount
1 2020-01-29 10
1 2020-03-14 60
2 2020-04-05 180
2 2020-03-20 110
SELECT 4