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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 10.12 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 8.3.1 20190507 (Red Hat 8.3.1-4), 64-bit
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user_id name position cost sum
2 Charles 1 214.11 454.13
2 Charles 2 240.02 454.13
3 Eva 1 214.11 360.96
3 Eva 2 146.85 360.96
5 Helene 1 168.18 308.2
5 Helene 2 140.02 308.2
4 John 1 181.03 343.16
4 John 2 162.13 343.16
1 Peter 1 100.34 520.38
1 Peter 2 180.02 520.38
1 Peter 3 240.02 520.38