You are viewing a plain text version of this content. The canonical link for it is here.
Posted to solr-user@lucene.apache.org by ZHANG Liang F <Li...@alcatel-sbell.com.cn> on 2012/06/28 04:00:21 UTC
what is precisionStep and positionIncrementGap
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
RE: what is precisionStep and positionIncrementGap
Posted by ZHANG Liang F <Li...@alcatel-sbell.com.cn>.
看了你的blog，写得相当不错啊！
我有一个网站www.ecmkit.com，专注内容管理的。有空多交流！
-----Original Message-----
From: Li Li [mailto:fancyerii@gmail.com]
Sent: 2012年6月28日 15:54
To: solr-user@lucene.apache.org
Subject: Re: what is precisionStep and positionIncrementGap
read "How it works" of
http://lucene.apache.org/core/old_versioned_docs/versions/3_5_0/api/all/org/apache/lucene/search/NumericRangeQuery.html
if you can read Chinese, I have a blog explaining the details of the implementation.
http://blog.csdn.net/fancyerii/article/details/7256379
On Thu, Jun 28, 2012 at 3:51 PM, ZHANG Liang F <Li...@alcatel-sbell.com.cn> wrote:
> 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/al
> l/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 <Li...@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
Re: what is precisionStep and positionIncrementGap
Posted by Li Li <fa...@gmail.com>.
read "How it works" of
http://lucene.apache.org/core/old_versioned_docs/versions/3_5_0/api/all/org/apache/lucene/search/NumericRangeQuery.html
if you can read Chinese, I have a blog explaining the details of the
implementation.
http://blog.csdn.net/fancyerii/article/details/7256379
On Thu, Jun 28, 2012 at 3:51 PM, ZHANG Liang F
<Li...@alcatel-sbell.com.cn> wrote:
> 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 <Li...@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
RE: what is precisionStep and positionIncrementGap
Posted by ZHANG Liang F <Li...@alcatel-sbell.com.cn>.
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 <Li...@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
Re: what is precisionStep and positionIncrementGap
Posted by Li Li <fa...@gmail.com>.
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
<Li...@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