added cluster functions which return a psum:bat[:void,;wrd],cmap:bat[void,:bte] (it recognizes a special case of compressed cmap (ie when the input was sorted).
added cluster functions which return a psum:bat[:void,;wrd],cmap:bat[void,:bte]
(it recognizes a special case of compressed cmap (ie when the input was sorted).

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