Submitted by: Claudio Valderrama C. (robocop)

SQL> select 1 from rdb$relations where rdb$relation_id in (0,1,2);
PLAN (RDB$RELATIONS INDEX (RDB$INDEX_1, RDB$INDEX_1, RDB$INDEX_1))

so far so good, but

SQL> create table t(a int not null);
SQL> create index "abc(" on t(a);
SQL> select * from t where a in (0, 1, 2);
PLAN (T INDEX (abc(abc(abc())

Hopefully, nobody that passed a sanity check would create such names!