How to use Aggregate functions on a single column tables
I would like to know the way to apply aggregate function on a single column table.
Orders = load ‘Orders’ using org.apache.hcatalog.pig.HCatLoader();
Order_emp = FOREACH Orders GENERATE $2 as employeeid;
Now I would like to apply the aggregate functions on the Order_emp.employeeid attribute. Please dont suggest me to group on any other column. Kindly provide a solution assuming the table ‘Orders’ has only one column.
Thanks in Advance,