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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?
.
CREATE TABLE calls ( id SERIAL PRIMARY KEY, arrive_date timestamp without time zone, depart_date timestamp without time zone, ship_id integer, port_id integer );
CREATE TABLE ports ( id SERIAL PRIMARY KEY, name text );
CREATE TABLE postings ( id SERIAL PRIMARY KEY, ship_id integer, user_id integer, start_date date, end_date date );
CREATE TABLE ships ( id SERIAL PRIMARY KEY, name text );
CREATE TABLE users ( id SERIAL PRIMARY KEY, name text );