Field values can be edited by using this tag. Any Ruby function can be used, as long as its on the format field.method or field[0..3]. Multiple methods can be chained, e.g. field.method1.method2 etc. The edits will be done in the final table, after all the lookups (joins). Sorting will be done after the edits.
Example
Each table and field can have multiple edits, as shown above. Searching on edited fields will currently search in the original data.