protected function subProcess(JoinCapableQuery $query, DBField $field)
{
// if need to exclude change field to NULL
if (array_key_exists($field->getField(), $this->excludedFields)) {
$value = $this->excludedFields[$field->getField()];
$query->get(is_null($value) ? new DBNull() : new DBValue($value), $field->getField());
} else {
$query->get($field);
}
}
