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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 10.21 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 8.5.0 20210514 (Red Hat 8.5.0-10), 64-bit
3 rows affected
2 rows affected
a
1
2
3
b c
45 2
76 3
ERROR:  insert or update on table "y" violates foreign key constraint "y_x_fk_c"
DETAIL:  Key (c)=(7) is not present in table "x".