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From "Bowesman Antony" <...@teamware.com>
Subject Re: Numerical Range Query
Date Tue, 13 May 2008 07:57:00 GMT
An alternative to Lucene's NumberTools, is Solr's NumberUtils, which is more 
space efficient for indexing numbers, but not as pretty to look at

http://lucene.apache.org/solr/api/org/apache/solr/util/NumberUtils.html



Dan Hardiker wrote:
> Hi,
> 
> I've got an application which stores ratings for content in a Lucene 
> index. It works a treat for the most part, apart from the use-case I 
> have for being able to filter out ratings that have less than a given 
> number of rates. It kinda works, but seems to use Alpha ranging rather 
> than Numeric ranging.
> 
> Here is the Java code I am using:
> 
> luceneQuery.add( new RangeQuery( new Term(RateUtils.SF_FILTERED_CNT, 
> minRatesString), null, true), BooleanClause.Occur.MUST );
> 
> For context:
> 
> * luceneQuery is a org.apache.lucene.search.BooleanQuery
> * RateUtils.SF_FILTERED_CNT is the String containing the appropriate 
> field name "rating-filtered-count"
> * minRatesString is an integer as a String
> 
> Here is where the field is added into the index:
> 
> document.add( new Field(RateUtils.SF_FILTERED_CNT, String.valueOf( 
> filteredCount ), Field.Store.YES, Field.Index.UN_TOKENIZED) );
> 
> For context:
> 
> * document is a org.apache.lucene.document.Document
> * filteredCount is an int (counting the number of rates that have occurred)
> 
> Unfortunately it doesn't work quite as I expected as if I have 5 
> documents in the index:
> 
> # 5 ratings
> # 9 ratings
> # 1 rating
> # 0 ratings
> # 11 ratings
> 
> If minRatesString is "5" then only the first document is returned, if 
> it's "1" then the 3rd and 5th are returned, if its "6" then none are 
> returned. It appears to be filtering alphabetically (starting with the 
> first digit/character and matching on that) rather than numerically.
> 
> Oddly enough, if I sort on that field ... it works as I expect.
> 
> Am I missing something?
> 
> 
> --
> Dan Hardiker
> 
> PS: I've been googling for well over an hour, if I'm not searching with 
> the right terms - please advise me! I tried to find a way to search the 
> archives specifically, but I could only browse them month by month.
> 
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> 


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