The following sequence of commands should work properly, but instead return an error. The issue seems to be that the prepared statement doesn't notice that the table that it's referencing has an ENUM type that got modified, causing it to refresh its referenced descriptors.

create type t as enum('a');
create table tab (t t);
prepare x as insert into tab values($1);
execute x('a');
alter type t add value 'b';
execute x('b');

ERROR: invalid input value for enum t: "b"
SQLSTATE: 22P02
demo@127.0.0.1:26257/defaultdb>

I'd expect that this should work fine, or at worst, the error should be about the prepared statement being out of date or something.

Epic CRDB-8948