[pylucene-dev] Getting list of unique field values?

[Kevin Ollivier]

Hi all,

One thing I'd like to do with my indexes is provide a browsable list  
of various metadata fields, such as Subject, so that users could  
click on any subject in the index and get a list of documents which  
have that subject.

I can currently do this by running a query like "Subject:[A TO Z]"  
then going through the results, checking the Subject value against  
the unique subject list and appending it if it doesn't exist.  
However, I have concerns about how well that will perform on large  
indexes, so I was wondering if anyone knew of any (Py)Lucene  
functions for doing this, which perhaps might be more efficient or  
scalable?

Thanks,

Kevin