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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
5 rows affected
mid col1
1 REQUIRED STRING
2 REQUIRED STRING, Optional A, Optional B
3 Optional A, REQUIRED STRING, Optional B
4 Optional A, Oprional X, Optional B
5 REQUIRED STRING 842, Lessor Optional A, Optional B
mid col1
2 REQUIRED STRING, Optional A, Optional B
3 Optional A, REQUIRED STRING, Optional B
5 REQUIRED STRING 842, Lessor Optional A, Optional B
mid col1
1 REQUIRED STRING
2 REQUIRED STRING, Optional A, Optional B
3 Optional A, REQUIRED STRING, Optional B
5 REQUIRED STRING 842, Lessor Optional A, Optional B
mid col1
2 REQUIRED STRING, Optional A, Optional B
3 Optional A, REQUIRED STRING, Optional B
5 REQUIRED STRING 842, Lessor Optional A, Optional B