sub options_sql_filter
{
   my($self, $request) = @_;
   my @options = $self->options;
   my @sql_bits;
   my @bind_params;
   foreach my $option (@options){
       my($sql_bit, @bind_param) = $option->sql_filter($request);
       push @sql_bits, $sql_bit;
       push @bind_params, @bind_param;
   }
   return (join ' AND ', @sql_bits), @bind_params;
}