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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
start_date end_date thediff
2017-05-29 00:00:00 2017-06-02 00:00:00 5
2017-06-01 00:00:00 2017-06-01 00:00:00 1
SELECT 2
id start_date end_date thediff
1 2017-06-01 00:00:00 2017-06-01 00:00:00 1
2 2017-05-29 00:00:00 2017-06-02 00:00:00 5
SELECT 2