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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?.
6 rows affected
id foo bar
1 12 22
2 32 42
ERROR:  column "t.id" must appear in the GROUP BY clause or be used in an aggregate function
LINE 2:     DISTINCT ON (id) id,
                             ^

id foo max_bar
1 10 22
2 30 42
id foo bar
1 12 22
2 32 42