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From Jan Høydahl <jan....@cominvent.com>
Subject Re: Stemming and other tokenizers
Date Mon, 12 Sep 2011 15:25:11 GMT
Hi,

Do they? Can you explain the layout of the documents? 

There are two ways to handle multi lingual docs. If all your docs have both an English and
a Norwegian version, you may either split these into two separate documents, each with the
"language" field filled by LangId - which then also lets you filter by language. Or you may
assign a title_en and title_no to the same document (expand with more fields if you have more
languages per document), and keep it as one document. Your client will then be adapted to
search the language(s) that the user wants.

If one document has multiple languages within the same field, e.g. "body", say one paragraph
of English and the next is Norwegian, then we currently do not have any capability in Solr
to apply different analysis (tokenization, stemming etc) to each paragraph.

--
Jan Høydahl, search solution architect
Cominvent AS - www.cominvent.com
Solr Training - www.solrtraining.com

On 12. sep. 2011, at 11:37, Manish Bafna wrote:

> What is single document has multiple languages?
> 
> On Mon, Sep 12, 2011 at 2:23 PM, Jan Høydahl <jan.asf@cominvent.com> wrote:
> 
>> Hi
>> 
>> Everybody else use dedicated field per language, so why can't you?
>> Please explain your use case, and perhaps we can better help understand
>> what you're trying to do.
>> Do you always know the query language in advance?
>> 
>> --
>> Jan Høydahl, search solution architect
>> Cominvent AS - www.cominvent.com
>> Solr Training - www.solrtraining.com
>> 
>> On 12. sep. 2011, at 08:28, Patrick Sauts wrote:
>> 
>>> I can't create one field per language, that is the problem but I'll dig
>> into
>>> it following your indications.
>>> I let you know what I could come out with.
>>> 
>>> Patrick.
>>> 
>>> 2011/9/11 Jan Høydahl <jan.asf@cominvent.com>
>>> 
>>>> Hi,
>>>> 
>>>> You'll not be able to detect language and change stemmer on the same
>> field
>>>> in one go. You need to create one fieldType in your schema per language
>> you
>>>> want to use, and then use LanguageIdentification (SOLR-1979) to do the
>> magic
>>>> of detecting language and renaming the field. If you set
>>>> langid.override=false, languid.map=true and populate your "language"
>> field
>>>> with the known language, you will probably get the desired effect.
>>>> 
>>>> --
>>>> Jan Høydahl, search solution architect
>>>> Cominvent AS - www.cominvent.com
>>>> Solr Training - www.solrtraining.com
>>>> 
>>>> On 10. sep. 2011, at 03:24, Patrick Sauts wrote:
>>>> 
>>>>> Hello,
>>>>> 
>>>>> 
>>>>> 
>>>>> I want to implement some king of AutoStemming that will detect the
>>>> language
>>>>> of a field based on a tag at the start of this field like #en# my field
>>>> is
>>>>> stored on disc but I don't want this tag to be stored. Is there a way
>> to
>>>>> avoid this field to be stored ?
>>>>> 
>>>>> To me all the filters and the tokenizers interact only with the indexed
>>>>> field and not the stored one.
>>>>> 
>>>>> Am I wrong ?
>>>>> 
>>>>> Is it possible to you to do such a filter.
>>>>> 
>>>>> 
>>>>> 
>>>>> Patrick.
>>>>> 
>>>> 
>>>> 
>> 
>> 


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