function makeDistinct($ar_limit)
{
$colNames = $this->getColumnNames();
// calc limit
if (!isset($ar_limit[0]) && !isset($ar_limit[1])) {
$limit = -1;
} else {
if (count($ar_limit) > 1) {
$limit = $ar_limit[0] + $ar_limit[1];
} else {
$limit = $ar_limit[0];
}
}
$rs = new ResultSet();
$rs->copyColumData($this);
$distinctRows = array();
$this->reset();
while (++$this->pos < count($this->rows)) {
$currentValues = array();
foreach ($colNames as $col) {
array_push($currentValues, md5($this->getCurrentValueByName($col)));
}
$joinedValues = join("-", $currentValues);
if (!array_key_exists($joinedValues, $distinctRows)) {
$distinctRows[$joinedValues] = 1;
$rs->append(false);
$rs->rows[$rs->pos]->fields = $this->rows[$this->pos]->fields;
$rs->rows[$rs->pos]->id = $this->rows[$this->pos]->id;
}
if ($limit != -1) {
if ($rs->getRowCount() >= $limit) {
break;
}
}
}
--$this->pos;
return $rs;
}
