public function render_table()
{
$ret = array();
if (!is_array($this->args['table'])) {
return;
}
foreach ($this->args['table'] as $row) {
list($table, $alias) = $row;
$table = $this->bt($table);
if ($alias !== UNDEFINED && $alias) {
$table .= ' ' . $this->bt($alias);
}
$ret[] = $table;
}
return implode(',', $ret);
}