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Date: Fri, 20 Apr 2012 15:04:40 +0000 (UTC)
From: "Colin Hebert (Created) (JIRA)" <jira@apache.org>
To: dev@lucene.apache.org
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Subject: [jira] [Created] (SOLR-3386) ExtractingRequestHandler applies fname
 settings to literals
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ExtractingRequestHandler applies fname settings to literals
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                 Key: SOLR-3386
                 URL: https://issues.apache.org/jira/browse/SOLR-3386
             Project: Solr
          Issue Type: Bug
          Components: contrib - Solr Cell (Tika extraction)
    Affects Versions: 3.5
            Reporter: Colin Hebert
            Priority: Minor


The SolrContentHandler.addLiterals() method call the SolrContentHandler.addField() which itself obtain the field with SolrContentHandler.findMappedName().

If this call makes sense with SolrContentHandler.addMetadata() [and others]  because the user can't set the name of the fields otherwise, but with literals, the name of the field is manually given by the user so it shouldn't be changed at all (maybe applying unknownFieldPrefix or defaultField could be done, but even that doesn't seem quite normal).

----

I got this issue with the following usecase:

I have a schema containing a "title" field which is mandatory and contains only one value.
My documents have an internal title which is used as the value of the "title" field.
When sending one of these documents (and HTML document), if it contains a "title" metadata I get an exception because I have multiple values for my "title" field (as I would expect).
To fix that I used "fname.title=tika_title", so the title provided by tika is kept under another name.
Both titles (the original one I pass manually, and the metadata one) are now named "tika_title" and I get an exception because "title" hasn't been provided at all.

----

An easy workaround for this bug is sending the literal as "my_title", and adding the following fnames "fname.my_title=title&fname.title=tika_title". A small swicheroo which puts back the correct value in the expected field.

----

A way to fix that is extracting the first blocks of SolrContentHandler.addField() in an external method (or put the lowerNames check in SolrContentHandler.findMappedName() ) and use that external method (or findMappedName() ) _before_ calling SolrContentHandler.addField()

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