SQL Resource limit exceeded

In the SQL below the select dies with [SQL0904] Resource limit exceeded., 57011, -904. Resource limit type 3 exceeded with reason code 102. Tried both Run SQL Scripts and DB2 for i.

Remove either one of the HEX functions and it runs. Any thoughts? Am I missing something obvious?

The SQL has no practical value, just experimenting on PUB400.

with e as (
select QSYS2.BASE64_ENCODE(cast('123' as varchar(10) ccsid 1208 )) as e_value
from SYSIBM.SYSDUMMY1),
d as (
select QSYS2.BASE64_DECODE(e_value) as d_value, e_value
from e
)
select d_value,HEX(d_value), e_value, HEX(e_value) from d

-- select CHAR_length(E_value) as e_len, CHAR_length(d_value) as d_len from d;
-- select d_value,HEX(d_value), e_value, HEX(e_value) from d;