Throwing out the identity function was not correct. It serves a purpose in emptySet handling.
Throwing out the identity function was not correct.
It serves a purpose in emptySet handling.

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