I am trying to perform this sql statement in dremio on a mongodb source. But I am getting following error message.

Cannot apply ‘SUM’ to arguments of type ‘SUM(<VARCHAR(65536)>)’. Supported form(s): ‘SUM()’.

Is there a way to perform such queries on mongdb sources in dremio? Thanks for any help.

select

l_returnflag,

l_linestatus,

sum(l_quantity) as sum_qty,

sum(l_extendedprice) as sum_base_price,

sum(l_extendedprice * (1 - l_discount)) as sum_disc_price,

sum(l_extendedprice * (1 - l_discount) * (1 + l_tax)) as sum_charge,

avg(l_quantity) as avg_qty,

avg(l_extendedprice) as avg_price,

avg(l_discount) as avg_disc,

count(*) as count_order

from

postgresql.public.lineitem

where

l_shipdate <= date ‘1998-12-01’ - interval ‘90’ day

group by

l_returnflag,

l_linestatus

order by

l_returnflag,

l_linestatus;