hi,
I am considering lucene for a project at work, however one of the requirements is that:

for each query requested a list of facets, that is, an aggregation of values from specific fields in the result set be displayed in order to allow the user to further focus his query

i see that performance wise this can be done on about 500 results at query time, but this is not good enough, i need it done on all answers , which means this should be handled at indexing time

thanks in advance,
zeev