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Posted to solr-user@lucene.apache.org by KnightRider <ks...@gmail.com> on 2013/05/07 18:58:36 UTC

Use case for storing positions and offsets in index?

Can someone please tell me the usecase for storing term positions and offsets
in the index?

I am trying to understand the difference between storing positions/offsets
vs indexing positions/offsets.

Thanks
KR



-----
Thanks
-K'Rider
--
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Re: Use case for storing positions and offsets in index?

Posted by KnightRider <ks...@gmail.com>.

Thanks Jack & Jason



-----
Thanks
-K'Rider
--
View this message in context: http://lucene.472066.n3.nabble.com/Use-case-for-storing-positions-and-offsets-in-index-tp4061376p4061890.html
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Re: Use case for storing positions and offsets in index?

Posted by Jason Hellman <jh...@innoventsolutions.com>.

Consider further that term vector data and highlighting becomes very useful if you highlight externally to Solr.  That is to say, you have the data stored externally and wish to re-parse positions of terms (especially synonyms) from source material.  This is a (not too uncommon) technique used for extremely large articles, where data storage in the Lucene index might be repetitive.

On May 8, 2013, at 11:04 PM, "Jack Krupansky" <ja...@basetechnology.com> wrote:

> Term positions in the index are used for phrase query and span queries.
> 
> There is a separate concept called "term vectors" that maintains positions as well. It is most useful for highlighting - you want to know exactly where a term started and ended.
> 
> -- Jack Krupansky
> 
> -----Original Message----- From: KnightRider
> Sent: Tuesday, May 07, 2013 12:58 PM
> To: solr-user@lucene.apache.org
> Subject: Use case for storing positions and offsets in index?
> 
> Can someone please tell me the usecase for storing term positions and offsets
> in the index?
> 
> I am trying to understand the difference between storing positions/offsets
> vs indexing positions/offsets.
> 
> Thanks
> KR
> 
> 
> 
> -----
> Thanks
> -K'Rider
> --
> View this message in context: http://lucene.472066.n3.nabble.com/Use-case-for-storing-positions-and-offsets-in-index-tp4061376.html
> Sent from the Solr - User mailing list archive at Nabble.com.

Re: Use case for storing positions and offsets in index?

Posted by Jack Krupansky <ja...@basetechnology.com>.

Term positions in the index are used for phrase query and span queries.

There is a separate concept called "term vectors" that maintains positions 
as well. It is most useful for highlighting - you want to know exactly where 
a term started and ended.

-- Jack Krupansky

-----Original Message----- 
From: KnightRider
Sent: Tuesday, May 07, 2013 12:58 PM
To: solr-user@lucene.apache.org
Subject: Use case for storing positions and offsets in index?

Can someone please tell me the usecase for storing term positions and 
offsets
in the index?

I am trying to understand the difference between storing positions/offsets
vs indexing positions/offsets.

Thanks
KR



-----
Thanks
-K'Rider
--
View this message in context: 
http://lucene.472066.n3.nabble.com/Use-case-for-storing-positions-and-offsets-in-index-tp4061376.html
Sent from the Solr - User mailing list archive at Nabble.com.