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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 15.0 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
INSERT 0 13
id numrange numrange
999 [5,300) [2,95)
999 [5,300) [90,223)
999 [5,300) [95,223)
999 [5,300) [223,284)
999 [5,300) [284,291)
999 [5,300) [284,291)
999 [5,300) [284,300)
333 [5,300) [2,89)
333 [5,300) [90,223)
333 [5,300) [223,284)
333 [5,300) [284,291)
333 [5,300) [284,291)
333 [5,300) [284,300)
SELECT 13
id gesamtrange rangearray
333 [5,300) {[2,89),[90,300)}
SELECT 1
id gesamtrange rangearray
333 [5,300) {[2,89),[90,300)}
999 [5,300) {[2,300)}
SELECT 2