Not very clean - but you can try something like this -
with src as (select 'AB' as code, ARRAY('AB123','MU124') as codeset
union all
select 'LM' as code, ARRAY('LM123','LM234') as codeset)
select a.code, CASE WHEN e.c is null THEN False ELSE TRUE END as condition
from (select code, size(codeset) c from src) as a left join
(select code, count(*) c
from (select code, explode(codeset) as val from src)
where instr(val, code) > 0
group by code) e on (a.code=e.code and a.c=e.c)