/**
* Merges the output of the child queries by using a common key
*
* @param {string} $key
*/
private function mergeByKey($key, $orderBy)
{
$result = array();
foreach ($this->children as $query) {
$rows = $query->select($this->paramValues, $query->keyField($key), false);
Arrays::mergeAssocs($result, $rows, $orderBy, $this->orderType);
}
// Convert 'back' to indexed array in case the main query has no output key
if (!$this->output->key) {
return Arrays::toIndexed($result);
}
return $result;
}
