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From "Grant Ingersoll (JIRA)" <j...@apache.org>
Subject [jira] Commented: (SOLR-1979) Create LanguageIdentifierUpdateProcessor
Date Tue, 07 Dec 2010 01:08:11 GMT

    [ https://issues.apache.org/jira/browse/SOLR-1979?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12968528#action_12968528
] 

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

bq. So for all unmapped languages, you may want to map to a single generic field, or not map
at all (leave field as is).

It currently leaves it in the original field.

bq. Also, if there are multiple input fields, the current patch would create multiple language
field values requiring that field to be multi-valued. Is the goal here to identify a single
language for a document? Or a separate language value for each of the input fields (which
seems odd to me)?

Current patch requires multivalued language field.  I figure the main thing you want the lang.
field for is faceting and filtering, but it can be changed.  As for the broader goal, I think
it makes sense to detect languages per field and not per document.  In other words, you can
have multiple languages in a single document.

> 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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