Postgres 12

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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 12.14 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 8.5.0 20210514 (Red Hat 8.5.0-16), 64-bit

SELECT 1

CREATE TABLE foods (
  id SERIAL PRIMARY KEY, 
  name VARCHAR(100)
);
INSERT INTO foods(name)
VALUES  ('Apple'),
        ('Banana'),
        ('Lemon');

CREATE TABLE

INSERT 0 3

SELECT * FROM foods

id
name

1
Apple

2
Banana

3
Lemon

SELECT 3