sub to_sql
{
- my($self, $andlevel)=@_;
+ my($self, $andlevel, $parent_is_tag)=@_;
$andlevel=1 unless(defined($andlevel));
+ $parent_is_tag=0 unless(defined($parent_is_tag));
my ($leftandlevel, $rightandlevel);
my ($leftstr, $rightstr);
my $op=$self->op();