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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 12.15 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 13
send_date | open_date | |
---|---|---|
Address_1 | 2021-05-02 | null |
Address_1 | 2021-05-02 | null |
Address_1 | 2021-05-03 | null |
Address_1 | 2021-05-05 | 2021-05-05 |
Address_1 | 2021-05-10 | null |
Address_1 | 2021-05-11 | 2021-05-11 |
Address_2 | 2021-05-01 | null |
Address_2 | 2021-05-01 | 2021-05-01 |
Address_2 | 2021-05-02 | null |
Address_2 | 2021-05-03 | null |
Address_2 | 2021-05-04 | 2021-05-04 |
Address_2 | 2021-05-05 | 2021-05-05 |
Address_2 | 2021-05-06 | null |
SELECT 13
send_date | open_date | groupid | |
---|---|---|---|
Address_1 | 2021-05-02 | null | 0 |
Address_1 | 2021-05-02 | null | 0 |
Address_1 | 2021-05-03 | null | 0 |
Address_1 | 2021-05-05 | 2021-05-05 | 0 |
Address_1 | 2021-05-10 | null | 1 |
Address_1 | 2021-05-11 | 2021-05-11 | 1 |
Address_2 | 2021-05-01 | null | 1 |
Address_2 | 2021-05-01 | 2021-05-01 | 0 |
Address_2 | 2021-05-02 | null | 1 |
Address_2 | 2021-05-03 | null | 1 |
Address_2 | 2021-05-04 | 2021-05-04 | 1 |
Address_2 | 2021-05-05 | 2021-05-05 | 2 |
Address_2 | 2021-05-06 | null | 3 |
SELECT 13
send_date | open_date | groupid | |
---|---|---|---|
Address_1 | 2021-05-02 | null | 0 |
Address_1 | 2021-05-02 | null | 0 |
Address_1 | 2021-05-03 | null | 0 |
Address_1 | 2021-05-05 | 2021-05-05 | 0 |
Address_1 | 2021-05-10 | null | 1 |
Address_1 | 2021-05-11 | 2021-05-11 | 1 |
Address_2 | 2021-05-01 | null | 0 |
Address_2 | 2021-05-01 | 2021-05-01 | 0 |
Address_2 | 2021-05-02 | null | 1 |
Address_2 | 2021-05-03 | null | 1 |
Address_2 | 2021-05-04 | 2021-05-04 | 1 |
Address_2 | 2021-05-05 | 2021-05-05 | 2 |
Address_2 | 2021-05-06 | null | 3 |
SELECT 13
send_date | open_date | counttilopen | |
---|---|---|---|
Address_1 | 2021-05-02 | null | null |
Address_1 | 2021-05-02 | null | null |
Address_1 | 2021-05-03 | null | null |
Address_1 | 2021-05-05 | 2021-05-05 | 4 |
Address_1 | 2021-05-10 | null | null |
Address_1 | 2021-05-11 | 2021-05-11 | 2 |
Address_2 | 2021-05-01 | 2021-05-01 | 1 |
Address_2 | 2021-05-01 | null | null |
Address_2 | 2021-05-02 | null | null |
Address_2 | 2021-05-03 | null | null |
Address_2 | 2021-05-04 | 2021-05-04 | 4 |
Address_2 | 2021-05-05 | 2021-05-05 | 1 |
Address_2 | 2021-05-06 | null | null |
SELECT 13
send_date | open_date | counttilopen | |
---|---|---|---|
Address_1 | 2021-05-02 | null | null |
Address_1 | 2021-05-02 | null | null |
Address_1 | 2021-05-03 | null | null |
Address_1 | 2021-05-05 | 2021-05-05 | 4 |
Address_1 | 2021-05-10 | null | null |
Address_1 | 2021-05-11 | 2021-05-11 | 2 |
Address_2 | 2021-05-01 | null | null |
Address_2 | 2021-05-01 | 2021-05-01 | 2 |
Address_2 | 2021-05-02 | null | null |
Address_2 | 2021-05-03 | null | null |
Address_2 | 2021-05-04 | 2021-05-04 | 3 |
Address_2 | 2021-05-05 | 2021-05-05 | 1 |
Address_2 | 2021-05-06 | null | null |
SELECT 13