Query not working as expected

[Matt Schraeder]

I'm attempting to write a query as follows:
 
($query^10) OR (NOT ($query)) which effectively would return everything, but if 
it matches the first query it will get a higher score and thus be sorted first 
in the result set.  Unfortunately the results are not coming back as expected. 
 
($query) works by itself and gets X rows
(NOT ($query)) works by itself and gets Y rows
 
You would expect ($query) OR (NOT ($query)) to return X+Y rows but it is only 
returning X rows.
 
What am I doing wrong?