fixed hash file leak (this is a back port, ie no propagation needed)
fixed hash file leak (this is a back port, ie no propagation needed)

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