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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?.
version
PostgreSQL 12.17 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 8.5.0 20210514 (Red Hat 8.5.0-18), 64-bit
SELECT 1
CREATE TABLE
INSERT 0 4
CREATE TABLE
INSERT 0 5
id1 let my_cnt
1 A 3
2 B 1
3 C 0
4 D 1
SELECT 4