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https://issues.apache.org/jira/browse/LUCENE-4882?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13614604#comment-13614604
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Shai Erera commented on LUCENE-4882:
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The fix that I added to CountingListBuilder is only for the case where you
index facets such as "a", "b", which is done in tests only. Usually, your
facets will look like dimension/level1[/level2/level3...], in which case you're
not affected by the fix in CLB. I would just extends FacetsAccumulator with a
TODO "remove when 4.3 is out"...
> FacetsAccumulator.java:185 throws NullPointerException if it's given an empty
> CategoryPath.
> -------------------------------------------------------------------------------------------
>
> Key: LUCENE-4882
> URL: https://issues.apache.org/jira/browse/LUCENE-4882
> Project: Lucene - Core
> Issue Type: Bug
> Components: modules/facet
> Affects Versions: 4.2
> Reporter: crocket
> Assignee: Shai Erera
> Priority: Critical
> Fix For: 5.0, 4.3
>
> Attachments: LUCENE-4882.patch
>
>
> When I wanted to count root categories, I used to pass "new CategoryPath(new
> String[0])" to a CountFacetRequest.
> Since upgrading lucene from 4.1 to 4.2, that threw
> ArrayIndexOfOutBoundsException, so I passed CategoryPath.EMPTY to a
> CountFacetRequest instead, and this time I got NullPointerException.
> It all originates from FacetsAccumulator.java:185
> Does someone conspire to prevent others from counting root categories?
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