The default low-level mode is iterative!

The new csv function by default is pulling all data into memory, but by using a filter you can prevent that. The documentation shows examples.

Iterative (straight from the docs):

use Text::CSV_XS;
my $csv = Text::CSV_XS->new ({ binary => 1, auto_diag => 1 });
open my $fh, "<", "file.csv" or die "file.csv: $!";
while (my $row = $csv->getline ($fh)) {
    # do something with @$row
    }
close $fh or die "file.csv: $!";
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