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Works basically as a normal Join operator with one exception: elements on the left inp= ut will be transfered even if there is no join partner. In this case t= he schema will be filled with null values.
See Join operator.
bidWnd =3D ELEME= NTWINDOW({SIZE =3D 1}, bid) auctionWnd =3D ELEMENTWINDOW({SIZE =3D 1}, auction) out =3D LEFTJOIN({predicate=3D'id=3Dauction'}, auctionWnd, bidWnd)