Submitted by: @pcisar

Here is reproducible test:

create table test_table_01 (
id int,
get_temp_i computed by ((cast (64 as int))),
fld2 int
);
commit;
insert into test_table_01 (id, fld2) values (1, 1);
commit;

select * from test_01;

      ID    GET\_TEMP\_I         FLD2

============ ============= ============
1 64 1

select get_temp_i+1 from test_01;

              ADD

=====================
65

select
case get_temp_i
when (get_temp_i = 1) then 1
else 2
end as case_result
from test_table_01;

CASE_RESULT

Statement failed, SQLSTATE = 22018
conversion error from string "64"