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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 14.5 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 8.5.0 20210514 (Red Hat 8.5.0-10), 64-bit
SELECT 1
CREATE TABLE
CREATE TABLE
INSERT 0 7
INSERT 0 4
mid m_oid_wohnort vorname nachname geburtsdatum lieblingsort lieblingsbeschaeftigung
1 null you null null null Datenbanken
2 7 me null 1987-12-24 Meer Datenbanken
3 6 Udo Lindenberg 1946-05-17 null Musik
4 5 Ludwig van Beethoven 1770-12-17 null Musik
SELECT 4
vorname ort
me New York
Udo Berlin
Ludwig Bonn
SELECT 3
vorname ort
you null
me New York
Udo Berlin
Ludwig Bonn
SELECT 4
vorname ort
Udo Berlin
Ludwig Bonn
SELECT 2