Exclusion search

On Wed, Jul 22, 2009 at 9:49 AM, ba3 wrote:


Hi,

In the documents which contain the volunteer information :

Doc1 :
volunteer krish
volunteer john
volunteer Raj
...

Doc2 :
volunteer krish
volunteer Raj
volunteer Ganesh

Doc3 :
volunteer krish
volunteer Raj

The documents having ONLY krish and Raj as the volunteers need to be found.
As in above snapshot of docs, the doc3 alone qualifies in the result and
not
the first two. Using boolean query I could find the three documents.

Can you please suggest me some pointers as to how this can be achieved.

-- Regards
Ba3
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On Wed, Jul 22, 2009 at 11:47 AM, ba3 wrote:

query
to
Thanks for the reply. But.,
The number of documents run into few thousands. Hence editing them is not
an
option.
Is there any other ways to solve this scenario.

-- Rgds
Ba3
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On Wed, Jul 22, 2009 at 6:48 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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Can you re-index the documents? Because it's much simpler tojust count the
number of volunteers *as you add fields to the
doc to index it* and then just add the count field after you're
done parsing the document. Your corpus is small, so this
shouldn't take very long.....

Or I completely misunderstand.

Erick