Nifi custom processor resultset issue

[#1]

I have custom processor like ExecuteSql . after executing query i get resultset. now i want add new values like queryid , starttime , and end time in resultset and send in flow file like normal result set. How i can do this. please advice thank you in advance

[#2]

Are you going to need these values once per flow file, or for each row of the result set?

[#3]

once per flow file

[#4]

I need these value once per flow file...