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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
CREATE TABLE
INSERT 0 4
INSERT 0 4
INSERT 0 1
month co_count tm_count tw_count
2019-03 0 1 1
2019-04 1 2 0
2019-05 3 1 0
SELECT 3