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From ZHANG Liang F <Liang.f.Zh...@alcatel-sbell.com.cn>
Subject RE: what is precisionStep and positionIncrementGap
Date Thu, 28 Jun 2012 07:51:03 GMT
Thanks a lot, but the precisionStep is still very vague to me! Could you give me a example?


-----Original Message-----
From: Li Li [mailto:fancyerii@gmail.com] 
Sent: 2012年6月28日 11:25
To: solr-user@lucene.apache.org
Subject: Re: what is precisionStep and positionIncrementGap

1. precisionStep is used for ranging query of Numeric Fields. see http://lucene.apache.org/core/old_versioned_docs/versions/3_5_0/api/all/org/apache/lucene/search/NumericRangeQuery.html
2. positionIncrementGap is used for phrase query of multi-value fields e.g. doc1 has two titles.
   title1: ab cd
   title2: xy zz
   if your positionIncrementGap is 0, then the position of the 4 terms are 0,1,2,3.
   if you search phrase "cd xy", it will hit. But you may think it should not match
   so you can adjust positionIncrementGap to a larger one. e.g. 100.
   Then the positions now are 0,1,100,101. the phrase query will not match it.

On Thu, Jun 28, 2012 at 10:00 AM, ZHANG Liang F <Liang.f.Zhang@alcatel-sbell.com.cn>
wrote:
> Hi,
> in the schema.xml, usually there will be fieldType definition like 
> this: <fieldType name="int" class="solr.TrieIntField" 
> precisionStep="0" omitNorms="true" positionIncrementGap="0"/>
>
> the precisionStep and positionIncrementGap is not very clear to me. Could you please
elaborate more on these 2?
>
> Thanks!
>
> Liang
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