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https://issues.apache.org/jira/browse/LUCENE-4715?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13561628#comment-13561628
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Michael McCandless commented on LUCENE-4715:
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+1
This is very compelling because you also do not need to do the rollup in the
end, so you get the gains of NO_PARENTS without the cost (end rollup), so even
for indices w/ many unique ords there's no penalty.
I also suspect this is common ... ie most faceted search UIs I've seen do not
include the dim facet count, just the values under that dim.
> Add OrdinalPolicy.ALL_BUT_DIMENSION
> -----------------------------------
>
> Key: LUCENE-4715
> URL: https://issues.apache.org/jira/browse/LUCENE-4715
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/facet
> Reporter: Shai Erera
> Assignee: Shai Erera
>
> With the move of OrdinalPolicy to CategoryListParams,
> NonTopLevelOrdinalPolicy was nuked. It might be good to restore it, as
> another enum value of OrdinalPolicy.
> It's the same like ALL_PARENTS, only doesn't add the dimension ordinal, which
> could save space as well as computation time. It's good for when you don't
> care about the count of Date/, but only about its children counts.
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