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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
INSERT 0 3
CREATE TABLE
INSERT 0 3
user_id project_ids id project_name
1 {a0eebc99-9c0b-4ef8-bb6d-6bb9bd380a11,b0eebc99-9c0b-4ef8-bb6d-cbb9bd380a11} a0eebc99-9c0b-4ef8-bb6d-6bb9bd380a11 pro1
1 {a0eebc99-9c0b-4ef8-bb6d-6bb9bd380a11,b0eebc99-9c0b-4ef8-bb6d-cbb9bd380a11} b0eebc99-9c0b-4ef8-bb6d-cbb9bd380a11 pro2
2 {a0eebc99-9c0b-4ef8-bb6d-6bb9bd380a11,"",e0eebc99-9c0b-4ef8-bb6d-6bb9bd380a11} a0eebc99-9c0b-4ef8-bb6d-6bb9bd380a11 pro1
2 {a0eebc99-9c0b-4ef8-bb6d-6bb9bd380a11,"",e0eebc99-9c0b-4ef8-bb6d-6bb9bd380a11} e0eebc99-9c0b-4ef8-bb6d-6bb9bd380a11 pro3
SELECT 4
user_id project_ids projects
1 {a0eebc99-9c0b-4ef8-bb6d-6bb9bd380a11,b0eebc99-9c0b-4ef8-bb6d-cbb9bd380a11} {pro1,pro2}
2 {a0eebc99-9c0b-4ef8-bb6d-6bb9bd380a11,"",e0eebc99-9c0b-4ef8-bb6d-6bb9bd380a11} {pro1,pro3}
3 {922475bb-ad93-43ee-9487-d2671b886479,""} {}
SELECT 3