UDF: use correct type for BAT IDs, i.e., bat instead of int
UDF: use correct type for BAT IDs, i.e., bat instead of int

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