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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?.
19 rows affected
created_at num_orders
2017-05-04 3
2017-05-05 3
2017-05-06 3
2017-05-07 3
2017-05-08 3
2017-05-09 3
AvgOrderVelocity AvgLast7Days Last24h
 3.00  2.57 1