How to obtain unique field values

[Erik Hatcher]

One final Lucene question for the day...

Is it possible for me to retrieve all the values of a particular field that exists within an index, across all documents? I don't really need (or want) to retrieve all documents and then collate them myself into unique values, and it seems this information should be readily accessible somehow. If so, could you share how?

For example, I'm indexing documents that have a "category" associated with them. Several documents will share the same category. I'd like to be able to retrieve all categories.

And if you are curious what my project actually is - its my custom blogger, BlogScene: http://www.ehatchersolutions.com/servlets/blogscene - its a Lucene-based blogger (hence part of the reason for its name). All documents are indexed and stored in a Lucene index, and retrieved dynamically for every request. Thanks to Lucene its working very very nicely! I just need to add some polish to it, such as a category list and such.

Erik


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