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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 1
INSERT 0 1
CREATE TABLE
CREATE INDEX
ERROR:  new row for relation "relationship" violates check constraint "relationship_check"
DETAIL:  Failing row contains (1, 1, 100).
INSERT 0 1
ERROR:  duplicate key value violates unique constraint "unique_pair_ix"
DETAIL:  Key (LEAST(thing_one, thing_two), GREATEST(thing_one, thing_two))=(1, 2) already exists.