( ..., hshAgg => %hshAgg )
...
return $self->{hshAgg};
...
$self->{hshAgg} => %hshAgg;

##</code><code>##

hshAgg => \%hshAgg
...
return %{$self->{hshAgg}};
...
$self->{hshAgg} => \%hshAgg;