5.5 is slower than 5.3 because of many str_to_datetime calls

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

        lineitem

where

        l_shipdate <= date_sub('1998-12-01', interval 79 day)

group by

        l_returnflag,

        l_linestatus

order by

        l_returnflag,

        l_linestatus;