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From "Yonik Seeley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (SOLR-1979) Create LanguageIdentifierUpdateProcessor
Date Sun, 05 Dec 2010 20:57:14 GMT

    [ https://issues.apache.org/jira/browse/SOLR-1979?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12967016#action_12967016
] 

Yonik Seeley commented on SOLR-1979:
------------------------------------

bq. The new field is made by concatenating the original field name with "_" + the ISO 639
code. 

This could be problematic given a large set of language codes since they could collide with
existing dynamic field definitions.
Perhaps something with "text" in the name also?

Perhaps fieldName_${langCode}Text

Examples:
name_enText
name_frText

It would probably also be nice to be able to map a number of languages to a single field....
say you have a single analyzer that can handle CJK, then you may want that whole collection
of languages mapped to a single _cjk field.

And just because you can detect a language doesn't mean you know how to handle it differently...
so also have an optional catchall that handles all languages not specifically mapped.




> 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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