Shai Erera created LUCENE-5129:
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Summary: 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
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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