protected function getProjection()
{
if (empty($this->projection)) {
$colNames = $this->quoteIdentifier($this->metadata->getColumnNames());
return implode(", ", $colNames);
} elseif (is_string($this->projection)) {
return $this->projection;
} else {
$ps = array();
foreach ($this->projection as $p) {
$ps[] = $this->quoteIdentifier($p);
}
return implode(", ", $ps);
}
}