Migrate Green plum distinct on to Redshift row_number()

Green plum distinct on To Redshift row_number:

Green Plum:
select distinct on
(col_1, col_2, col_3) from table_t1
where condition_1=some_condition order by col_1, col_2, col_3

Rdshift:

select col_1, col_2, col_3 as <alias>
from
    (
    select row_number() over
    (
    partition by col_1 order by col_1
    ) as rn, col_1, col_2, col_3
    from table_1
    where col_4=<condition>
    order by col_1, col_2, col_3
    ) as t1
where t1.rn=1

Note: If you include more columns for partition by clause, check the no. of row count, as it should be different.