Also in a mergjoin situation we have to prefetch the heaps. Otherwise, we still hop around the string heap.
Also in a mergjoin situation we have to prefetch the heaps. Otherwise,
we still hop around the string heap.

zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb