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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
sl_no username petname
1 A XYZ
1 A ABC
2 B RTS
2 B DEF
3 C QWE
3 C GHI
4 D HGD
4 D JKL
SELECT 8