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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 4
name surname year count
Egor null null 2
Ivan null null 1
Dima null null 1
null Krid null 2
null Maxnin null 1
null Petrenko null 1
null null 14 1
null null 12 3
SELECT 8