remove node sort/distinct when it appears as the arg of fn:zero-or-one or fn:exactly-one
remove node sort/distinct when it appears as the arg of fn:zero-or-one or fn:exactly-one
28msec/zorba,28msec/zorba,28msec/zorba,cezarfx/zorba,bgarrels/zorba,cezarfx/zorba,cezarfx/zorba,bgarrels/zorba,cezarfx/zorba,28msec/zorba,bgarrels/zorba,bgarrels/zorba,cezarfx/zorba,cezarfx/zorba,bgarrels/zorba,28msec/zorba,28msec/zorba,cezarfx/zorba,bgarrels/zorba,28msec/zorba,cezarfx/zorba,bgarrels/zorba,cezarfx/zorba,28msec/zorba,28msec/zorba,bgarrels/zorba,cezarfx/zorba