my $data;
do {
   while ($data = $res->fetchrow_arrayref()) {
      if ($res->{syb_result_type} == CS_ROW_RESULT) {
         if (defined $data) {
            @$data = map { defined($_) ? $_ : "" } @$data;
         }
      }
   }
}

##</code><code>##

my @data;
do {
   while (@data = $res->fetchrow_array()) {
      if ($res->{syb_result_type} == CS_ROW_RESULT) {
         if (@data) {
            @data = map { defined($_) ? $_ : "" } @data;
         }
      }
   }
}