19. The method of claim 1 , further comprising, before making the first plurality of comparisons, processing the particular query to generate a modified query, wherein each comparison of the first plurality of comparisons is based on the modified query and the corresponding query.
19. The method of claim 1 , further comprising, before making the first plurality of comparisons, processing the particular query to generate a modified query, wherein each comparison of the first plurality of comparisons is based on the modified query and the corresponding query. 38. A volatile or non-volatile machine-readable medium storing one or more sequences of instructions which, when executed by one or more processors, causes the one or more processors to perform the method recited in claim 19 .