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https://issues.apache.org/jira/browse/LUCENE-5129?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13718324#comment-13718324
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ASF subversion and git services commented on LUCENE-5129:
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Commit 1506526 from [~shaie] in branch 'dev/trunk'
[ https://svn.apache.org/r1506526 ]
LUCENE-5129: CategoryAssociationsContainer should not allow null associations
> CategoryAssociationsContainer should not allow null associations
> ----------------------------------------------------------------
>
> Key: LUCENE-5129
> URL: https://issues.apache.org/jira/browse/LUCENE-5129
> Project: Lucene - Core
> Issue Type: Bug
> Components: modules/facet
> Reporter: Shai Erera
> Assignee: Shai Erera
> Fix For: 5.0, 4.5
>
> Attachments: LUCENE-5129.patch
>
>
> Currently you can set a null CategoryAssociation to a CategoryPath, but alas,
> it's just dropped by AssociationFacetFields. The history behind this break is
> that in the past, category associations were indexed twice, with and without
> the association value. In the move to 4.2 I guess with all the transitions
> the code went through, this behavior was nuked (as it doesn't make sense in
> general to index these categories twice), but AssociationFacetFields has a
> comment that these categories are added anyway -- this is of course wrong.
> Instead of supporting null category associations, which is not so trivial in
> AssociationFacetFields, I think that we should just prevent it (throw a hard
> exception). If a user wants to add a category such as Category/Computer
> Science=0.74 (i.e. with weight 0.74) and be able to aggregate Category/ with
> and without associations, he should either write a special FacetsAggregator
> which ignores the associated value, or add the category twice, once using
> FacetFields (counting) and second time with AssociationFacetFields.
> I'll post a patch soon.
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