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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?.
id_type grp_begin grp_end
3 2017-01-10 07:19:21 2017-01-10 07:19:25
5 2017-01-10 07:19:26 2017-01-10 07:19:26
3 2017-01-10 07:19:27.1 2017-01-10 07:19:27.1
5 2017-01-10 07:19:28 2017-01-10 07:19:29
3 2017-01-10 07:19:30.1 2017-01-10 07:19:30.1
5 2017-01-10 07:19:31 2017-01-10 07:19:31
3 2017-01-10 07:19:32 2017-01-10 07:19:32
5 2017-01-10 07:19:33.1 2017-01-10 07:19:37.1