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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 FUNCTION
CREATE AGGREGATE
CREATE TABLE
INSERT 0 79022
md5_agg
f57bddccbd1e14cbe7dc3020e879d778
SELECT 1
grp md5_agg
0 f57bddccbd1e14cbe7dc3020e879d778
SELECT 1
grp md5_agg
0 67ee866881833cb60a64e1a8662255b3
1 268fde93243588d529ba0250ef8f7426
2 5913a5b20c5139777301d7aaac7c424d
SELECT 3