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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?.
version
PostgreSQL 13.4 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 8.4.1 20200928 (Red Hat 8.4.1-1), 64-bit
6 rows affected
id lag_dc cs dc lead_dc ce
1 -infinity green 2020-05-27 16:33:52+01 2020-06-11 20:12:18+01 yellow
1 2020-05-27 16:33:52+01 yellow 2020-06-11 20:12:18+01 2020-06-11 20:20:58+01 red
1 2020-06-11 20:12:18+01 red 2020-06-11 20:20:58+01 infinity green
2 -infinity green 2020-08-06 14:59:21+01 2021-03-03 14:31:44+00 yellow
2 2020-08-06 14:59:21+01 yellow 2021-03-03 14:31:44+00 infinity red
3 -infinity green 2021-04-28 12:36:45+01 infinity red
id df dt cs
1 -infinity 2020-05-27 16:33:52+01 green
2 -infinity 2020-08-06 14:59:21+01 green
3 -infinity 2021-04-28 12:36:45+01 green
id dc lead_dc ce
1 2020-06-11 20:20:58+01 infinity green
2 2021-03-03 14:31:44+00 infinity red
3 2021-04-28 12:36:45+01 infinity red
id dc lead_dc ce
1 2020-05-27 16:33:52+01 2020-06-11 20:12:18+01 yellow
1 2020-06-11 20:12:18+01 2020-06-11 20:20:58+01 red
2 2020-08-06 14:59:21+01 2021-03-03 14:31:44+00 yellow
id Date from: Date to: Colour
1 -infinity 2020-05-27 16:33:52+01 green
1 2020-05-27 16:33:52+01 2020-06-11 20:12:18+01 yellow
1 2020-06-11 20:12:18+01 2020-06-11 20:20:58+01 red
1 2020-06-11 20:20:58+01 infinity green
2 -infinity 2020-08-06 14:59:21+01 green
2 2020-08-06 14:59:21+01 2021-03-03 14:31:44+00 yellow
2 2021-03-03 14:31:44+00 infinity red
3 -infinity 2021-04-28 12:36:45+01 green
3 2021-04-28 12:36:45+01 infinity red
9 rows affected
id ts_from ts_to colour
2 2021-03-03 14:31:44+00 infinity red
3 2021-04-28 12:36:45+01 infinity red
colour count
green 2
yellow 1