Postgres 13

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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?.

c

SELECT 0

c
\xffff

SELECT 1

c

SELECT 0

ERROR:  operator does not exist: bytea ~~* unknown
LINE 6: ...from (select '\xFFFF'::bytea as c) as bar where c ilike '_';
                                                             ^
HINT:  No operator matches the given name and argument types. You might need to add explicit type casts.