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From "Grant Ingersoll (JIRA)" <j...@apache.org>
Subject [jira] Commented: (SOLR-1979) Create LanguageIdentifierUpdateProcessor
Date Sun, 05 Dec 2010 20:21:14 GMT

    [ https://issues.apache.org/jira/browse/SOLR-1979?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12967010#action_12967010
] 

Grant Ingersoll commented on SOLR-1979:
---------------------------------------

bq. I would like to see RFC 3066 instead

Yeah, that makes sense, however, I believe Tika returns 639. (Tika doesn't recognize Chinese
yet at all).  One approach is we could normalize, I suppose.  Another is to fix Tika.  I'd
really like to see Tika support more languages, too.

Longer term, I'd like to not do the fieldName_LangCode thing at all and instead let the user
supply a string that could have variable substitution if they want, something like fieldName_${langCode},
or it could be ${langCode}_fieldName or it could just be another literal.

> Create LanguageIdentifierUpdateProcessor
> ----------------------------------------
>
>                 Key: SOLR-1979
>                 URL: https://issues.apache.org/jira/browse/SOLR-1979
>             Project: Solr
>          Issue Type: New Feature
>          Components: update
>            Reporter: Jan H√łydahl
>            Assignee: Grant Ingersoll
>            Priority: Minor
>         Attachments: SOLR-1979.patch, SOLR-1979.patch
>
>
> We need the ability to detect language of some random text in order to act upon it, such
as indexing the content into language aware fields. Another usecase is to be able to filter/facet
on language on random unstructured content.
> To do this, we wrap the Tika LanguageIdentifier in an UpdateProcessor. The processor
is configurable like this:
> {code:xml} 
>   <processor class="org.apache.solr.update.processor.LanguageIdentifierUpdateProcessorFactory">
>     <str name="inputFields">name,subject</str>
>     <str name="outputField">language_s</str>
>     <str name="idField">id</str>
>     <str name="fallback">en</str>
>   </processor>
> {code} 
> It will then read the text from inputFields name and subject, perform language identification
and output the ISO code for the detected language in the outputField. If no language was detected,
fallback language is used.

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