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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 2
INSERT 0 1
INSERT 0 1
INSERT 0 1
ERROR:  new row for relation "phase_steps" violates check constraint "step_status_for_step_type"
DETAIL:  Failing row contains (6, RESEARCH, ASSIGNED).
DELETE 5
ALTER TABLE
INSERT 0 2
INSERT 0 1
ERROR:  new row for relation "phase_steps" violates check constraint "step_status_for_step_type"
DETAIL:  Failing row contains (10, foo, ASSIGNED).