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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 12.17 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 8.5.0 20210514 (Red Hat 8.5.0-20), 64-bit
SELECT 1
CREATE TABLE
INSERT 0 3
a b
aaa 999
bbb 888
ccc 777
SELECT 3
ERROR:  operator does not exist: character < integer
LINE 1: select * from x order by a<b;
                                  ^
HINT:  No operator matches the given name and argument types. You might need to add explicit type casts.
ERROR:  operator does not exist: character = integer
LINE 1: select * from x order by a = b;
                                   ^
HINT:  No operator matches the given name and argument types. You might need to add explicit type casts.
ERROR:  operator does not exist: character <> integer
LINE 1: select * from x order by a <> b;
                                   ^
HINT:  No operator matches the given name and argument types. You might need to add explicit type casts.
ERROR:  operator does not exist: character <> integer
LINE 1: select * from x order by a <> b, b;
                                   ^
HINT:  No operator matches the given name and argument types. You might need to add explicit type casts.