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https://issues.apache.org/jira/browse/LUCENE-4724?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13564218#comment-13564218
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Commit Tag Bot commented on LUCENE-4724:
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[branch_4x commit] Shai Erera
http://svn.apache.org/viewvc?view=revision&revision=1439355
LUCENE-4724: disallow empty or null strings as components
> TaxonomyReader drops empty string component from CategoryPath
> -------------------------------------------------------------
>
> Key: LUCENE-4724
> URL: https://issues.apache.org/jira/browse/LUCENE-4724
> Project: Lucene - Core
> Issue Type: Bug
> Components: modules/facet
> Reporter: Michael McCandless
> Assignee: Shai Erera
> Fix For: 4.2, 5.0
>
> Attachments: LUCENE-4724.patch, LUCENE-4724.patch, LUCENE-4724.patch
>
>
> I ran the new PrintTaxonomyStats on a Wikipedia facets index, and it hit an
> AIOOBE because there was a child of the /categories path that had only one
> component ... this was created because I had added new
> CategoryPath("categories", "") during indexing.
> I think TaxoReader should preserve and return that empty string from .getPath?
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