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From "Erik Hatcher (JIRA)" <j...@apache.org>
Subject [jira] Commented: (SOLR-1979) Create LanguageIdentifierUpdateProcessor
Date Tue, 07 Dec 2010 05:53:10 GMT

    [ https://issues.apache.org/jira/browse/SOLR-1979?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12968582#action_12968582
] 

Erik Hatcher commented on SOLR-1979:
------------------------------------

Oh, and don't get me wrong, I get the multivalued language per document need too, here.  Anyway,
it'll be easy enough add support for this to be controlled through configuration.  In single
language per doc mode, basically concatenate all of the fields specified and detect on that
and map into a singled value language field.  Language-per-field I get too, of course... just
depends on the domain being modeled and in my experience I've seen apps designed both ways.
 Neither way is the one true way, it just depends. 

And of course Muir is smirking and saying "heck, you have multiple languages within a field
often too, so we need to account for that somehow too".  But probably not here, yet.

> 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, 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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