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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 |
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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