Thanks for that quick reply and code. I love open source!
But it seems there should be a way to do this without walking every document, since these fields are indexed after all :)
I realize that Lucene is very sophisticated under the covers, and there may be some technical reason why this isn't feasible though. But certainly when I do a query "category:SomeCategory" Lucene is not crawling all documents. Hopefully if its possible to obtain this information without walking every
document in the index someone will share how - but if not, its not the end of the world for my project.
Thanks,
Erik
On Monday, December 30, 2002, at 12:31 PM, Terry Steichen wrote:
Erik,
The attached class does what you want.
Regards,
Terry
PS: I've discovered that this code may not work if the index isn't optimized
(though I've not a clue why that's so).
----- Original Message -----
From: "Erik Hatcher" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, December 30, 2002 12:24 PM
Subject: How to obtain unique field values
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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