 [nondet]csv_read_file_row(+File, 
-Row, +Options)True when Row is a row in File. First unifies Row 
with the first row in File. Backtracking yields the second, 
... row. This interface is an alternative to csv_read_file/3 
that avoids loading all rows in memory. Note that this interface does 
not guarantee that all rows in File have the same arity.
[nondet]csv_read_file_row(+File, 
-Row, +Options)True when Row is a row in File. First unifies Row 
with the first row in File. Backtracking yields the second, 
... row. This interface is an alternative to csv_read_file/3 
that avoids loading all rows in memory. Note that this interface does 
not guarantee that all rows in File have the same arity.
In addition to the options of csv_read_file/3, 
this predicate processes the option:
- line(-Line)
- Line is unified with the 1-based line-number from which Row 
is read. Note that Line is not the physical line, but rather 
the
logical record number.