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https://issues.apache.org/jira/browse/SOLR-1973?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12926552#action_12926552
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Koji Sekiguchi commented on SOLR-1973:
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I can reproduce this.
> Empty fields in update messages confuse DataImportHandler
> ---------------------------------------------------------
>
> Key: SOLR-1973
> URL: https://issues.apache.org/jira/browse/SOLR-1973
> Project: Solr
> Issue Type: Bug
> Components: contrib - DataImportHandler
> Affects Versions: 3.1
> Environment: CentOS 5, Java 1.6, Tomcat 6
> Reporter: Sixten Otto
>
> I seem to be running into an issue with Solr (maybe just the
> DataImportHandler?) not liking empty field elements in the docs, and getting
> the wrong values into the fields of the index. Here's the entity declaration
> from data-config.xml for my isolated example:
> <document>
> <entity name="contentAsSolrAdd"
> dataSource="xml"
> processor="XPathEntityProcessor"
> stream="true"
> url="http://example.com/Content.xml";
> useSolrAddSchema="true">
> </entity>
> </document>
> And here's the Content.xml being pulled in by the DIH:
> <add>
> <doc>
> <field name="empty"></field>
> <field name="full">Lorem Ipsum Dolor</field>
> <field name="other">Some content is me!</field>
> </doc>
> </add>
> And here's the relevant portion of the output from the DIH in debug mode:
> <lst name="document#1">
> <str name="query">
> http://example.com/Content.xml
> </str>
> <str name="time-taken">0:0:0.6</str>
> <str>----------- row #1-------------</str>
> <str name="full">Some content is me!</str>
> <str name="empty">Lorem Ipsum Dolor</str>
> <str>---------------------------------------------</str>
> </lst>
> Notice that the field "full" doesn't appear here, but the following field
> "empty" has the content that was there for "full". The "other" field, which
> was non-empty, and preceded by a non-empty field, shows up correctly.
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