- handled special case (empty result of thetajoin is now returned immediately)   this fixed comp3 test (-- yes '1 = (2,3)' is evaluated as join :))
- handled special case (empty result of thetajoin is now returned immediately)
  this fixed comp3 test (-- yes '1 = (2,3)' is evaluated as join :))

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