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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 3
st_astext
MULTILINESTRING((1 1,2 2),(2 2,3 3),(3 3,4 4))
MULTILINESTRING((3 3,7 7),(7 7,4 4))
MULTILINESTRING((5 5,6 6))
SELECT 3