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From "Uwe Schindler" <...@thetaphi.de>
Subject RE: Sorting by NumericField not working
Date Sat, 26 Mar 2011 11:19:05 GMT
Hi,

No, the problem is easy: To sort against a field you have to index it. The
field is only stored. Later versions of Lucene will complain, if the field
is not indexed (as far as I remember, there was a commit about this). But
currently it is sorting against nothing, so it will do the default order.

Data types are correct from your code!

Please note: If you want to use the field *only* for sorting, but no numeric
range queries, then use Integer.MAX_VALUE as precisionStep, else you index
unneeded terms and bloat your index (see JavaDocs for explanation).

Uwe

-----
Uwe Schindler
H.-H.-Meier-Allee 63, D-28213 Bremen
http://www.thetaphi.de
eMail: uwe@thetaphi.de


> -----Original Message-----
> From: 石玉明 [mailto:shiyuming.shi@gmail.com]
> Sent: Saturday, March 26, 2011 2:26 AM
> To: java-user@lucene.apache.org
> Subject: Re: Sorting by NumericField not working
> 
> NumericField include int float double ... and so on. but your sort uses
> SortField.int .  Maybe that is the key point.
> -- newbie of Lucene
> 
> 
> 2011-03-26
> 
> 
> 
> 石玉明
> 
> 
> 
> 发件人: Azhar Jassal
> 发送时间: 2011-03-25  22:23:46
> 收件人: java-user@lucene.apache.org
> 抄送:
> 主题: Sorting by NumericField not working
> 
> Hi,
> 
> I'm trying to sort results by a NumericField but the results do not sort
> (still appear in default score order). The NumericField was indexed using
> the code below:
> 
> NumericField field = new NumericField(name,
> NumericUtils.PRECISION_STEP_DEFAULT, Field.Store.YES, false);
> field.setIntValue(value);
> document.add(field);
> 
> The searcher uses the following code to attempt to sort at search:
> 
> Sort sortBySize = new Sort(new SortField[] { new SortField("subj",
> SortField.INT) });
> TopFieldDocs topDocs = searcher.search(tq, null, limit, sortBySize);
> 
> Any ideas please? Is this the right method of sorting using a
NumericField?
> 
> Az


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