LOAD CSV reads row by row and one can do any kind of operation on that row. Is it possible to use more than one row at a time, for example, say I want to assign a relationship where every i'th row is a friend of (i-1)'th row? Or is it possible to store values of previous rows in some local variables while the LOAD CSV is running?
I don't know if it's possible, but in any case it might be easier to just add the data you need in your original CSV file (if you can edit it).
I had to do something like that, where each row had a relation to the previous row, and just added one column in the CSV file to do the job.