public function visitIndexBy(Segments\IndexBy $query)
{
$this->traversable = $this->traversable->indexBy($this->resolvedParameters[$query->getProjectionFunction()->getCallableId()]);
}
public function visitIndexBy(Segments\IndexBy $query)
{
$this->compilation->append('Index according to: ');
$this->compilation->appendFunction($query->getProjectionFunction());
$this->compilation->appendLine();
}