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From Steven A Rowe <sar...@syr.edu>
Subject RE: Exclusion search
Date Wed, 22 Jul 2009 16:16:09 GMT
If the number of volunteers is small enough, you could exclude all others in your query, e.g.:

All volunteers: a, b, c, d, e, f

Query to include documents containing only volunteers a and b:

   +vol:a  +vol:b -vol:c -vol:d -vol:e -vol:f

Steve

On 7/22/2009 at 6:49 AM, ba3 wrote:
> Yes, the documents were already indexed and the documents do not get
> updated.
> 
> Maintaining an alternate index is a nice solution. Will try it out.
> Thanks for the pointer.
> 
> If there is a solution which can use the same index it would be great!
> 
> --Rgds
> Ba3
> 
> 
> Perhaps I misunderstood something, but how do you update a document?
> 
> I mean, if a document contains vol:a, vol:b and vol:c and then you want
> to
> add vol:d to it, don't you remove the document and add it back?
> 
> If that's what you do, then you can also update the numvols field,
> right?
> 
> Or .. you mean you already have an index w/ all those documents
> indexed, and
> you want to search it now? If you cannot rebuild it, may I suggest the
> following - created another index and add documents to it in the same
> order
> as they were added to the current index. To each document add a
> 'numvols'
> field. Then use a ParallelReader to search over the two indices in
> parallel
> with the query I gave before. The two indices should look like this:
> 
>     Index 1                                      Index 2
> -------------------                           ------------------------
> Doc: vol1, vol2, vol3                  Doc: numvols:3
> Doc: vol1, vol4, vol6, vol7           Doc: numvols: 4
> Doc: vol5                                 Doc: numvols: 1
> Doc: vol3, vol8                          Doc: numvols: 2
> 
> It should work if your index doesn't have deletes. If it has, consider
> optimizing it or call expungeDeletes.
> 
> If your scenario is different, then perhaps try to explain it more
> accurately.
> 
> Shai


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