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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 12
start_date end_date thediff
2017-06-01 2017-06-01 1
2017-06-17 2017-06-17 0
2017-06-01 2017-06-12 8
2017-06-01 2017-06-13 9
2017-06-01 2017-06-16 12
2017-06-01 2017-06-17 12
2017-06-01 2017-06-18 12
2017-06-03 2017-06-12 6
2017-06-03 2017-06-13 7
2017-06-03 2017-06-16 10
2017-06-03 2017-06-17 10
2017-06-03 2017-06-18 10
SELECT 12