map/reduce

[Peter De Keer]

Would it be considered good behaviour to change this simple query:

http://dovetaildb.millstonecw.com/query?db=BoomTown&bag=personen&accesskey=F9CRuyB43ewn4tRijvb5wQ0FA79DIw46

This query is like SQL SELECT * FROM BoomTown

to create a map function to only retrieve the fields I need?
Like SQL SELECT name, firstname, phone FROM BoomTown

Or would that slow down the whole process?
Is that not the intended goal of map/reduce?