Postgres 14

By using db<>fiddle, you agree to license everything you submit by Creative Commons CC0.

Help with an interesting Postgres question: Why isn't an Index Only Scan used on a partition accessed via the parent table?.

CREATE TABLE example(
  x char
);

CREATE TABLE

INSERT INTO example(x) VALUES ('x');

INSERT 0 1

INSERT INTO example(x) VALUES (NULL);

INSERT 0 1

SELECT * FROM example WHERE x != 'y';

x

x

SELECT 1