checksum_agg on field list not working

Help this was working. Moved on to another DB.
Whenever I use checksum_agg on the result of Binary checksum (with a
field list) always returns zero.
When I try with * - all columns it works.
Cannot use all columns - too slow
select distinct binary_checksum('sp1,sp2,sp3,sp4,sp5,sp6
') from myTable
===> 1949676592 (result)
select checksum_agg(binary_checksum('sp1,sp2,sp
3,sp4,sp5,sp6')) from
myTable
===> 0 (result)
select checksum_agg(1949676592)
===> 1949676592 (result)
select checksum_agg(binary_checksum(*)) from myTable
===> -2019434987 (result)
select checksum_agg(binary_checksum(-2019434987))
===> -2019434987 (result)
? have no ideaSorted Field list should not be in quotes