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 Post subject: Double attribute question
PostPosted: Mon Dec 22, 2008 11:39 pm 

Joined: Mon Aug 22, 2005 1:22 am
Posts: 36
After researching some, I have a question in regards to double based attributes.

In the lucene docs, it appears that to speed up searching against double values, it is recommended to convert the value to a more sortable especially if negative numbers are used. The docs recommend using [url]
http://svn.apache.org/viewvc/incubator/ ... rev=382610[/url] to convert to a sortable value.

I looked at the built-in DoubleBridge and it doesn't use this function.

My questions are:
- is the built-in DoubleBridge adequate for searching/sorting?
- or should I create a SortableDoubleBridge that utilizes the Lucene recommended approach?

Has any one else used double based values in the searching? which implementation was used?

Hopefully I made my point clear.

- Doug

 Post subject:
PostPosted: Wed Dec 31, 2008 8:05 am 
Hibernate Team
Hibernate Team

Joined: Fri Oct 05, 2007 4:47 pm
Posts: 2296
Location: Third rock from the Sun
thanks for the valuable information.
I don't remember to have used the DoubleBridge recently; did you test it?
I often use other number bridges and I never had a problem with sorting.
In case you need to build your own SortableDoubleBridge we should include it in Search; however this would break backwards compatibility as the indexed terms are going to be different.

I'll open a task so this is not lost, if you can make a test and attach it that would be very helpful:



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