It's a funny bug in DBD::Google. If you look at the parser you'll see that @default_columns contains URL, but a few lines later it gets changed in this for loop:
for my $dc (@default_columns) {
$dc =~ s/([A-Z])/_\l$1/g;
$allowed_columns{$dc} = 1;
}
so that URL becomes _u_r_l.
I am not going to test it, but I'd change the loop to:
for my $dc (@default_columns) {
my $t;
($t=$dc) =~ s/([A-Z])/_\l$1/g;
$allowed_columns{$t} = 1;
}
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