Postgres 15

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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?.

select version();

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 test
(
  x TEXT
);

CREATE TABLE

INSERT INTO test VALUES
('abc');

INSERT 0 1

SELECT * FROM test;

x

abc

SELECT 1