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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 enum type genders
CREATE TYPE genders AS ENUM(
'MALE', 'FEMALE'
);
CREATE TYPE
-- create people table
CREATE TABLE people(
id VARCHAR(36) PRIMARY KEY,
first_name VARCHAR(50) NOT NULL,
last_name VARCHAR(50) NOT NULL,
gender genders NOT NULL
);
-- Unique Constraints
ALTER TABLE people
ADD CONSTRAINT people_fname_lname_uk UNIQUE (first_name, last_name);
CREATE TABLE
ALTER TABLE
-- list values of enum
SELECT e.enumlabel
FROM pg_enum e
JOIN pg_type t ON e.enumtypid = t.oid
WHERE t.typname = 'genders';
| enumlabel |
|---|
| MALE |
| FEMALE |
SELECT 2
INSERT INTO people(id, first_name, last_name, gender) VALUES(gen_random_uuid(), 'Giri', 'Potte', 'MALE');
INSERT 0 1
INSERT INTO people(id, first_name, last_name, gender) VALUES(gen_random_uuid(), 'Boo', 'Potte', 'MALE');
INSERT 0 1
SELECT * FROM people;
| id | first_name | last_name | gender |
|---|---|---|---|
| 1528c876-6cd7-4925-b78c-4fac3cb4810b | Giri | Potte | MALE |
| e6feb8b8-5b4b-4858-af29-7a5d450b9c59 | Boo | Potte | MALE |
SELECT 2