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https://issues.apache.org/jira/browse/LUCENE-7994?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16237619#comment-16237619
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ASF subversion and git services commented on LUCENE-7994:
---------------------------------------------------------

Commit 4add3016aff336ed547601cf6a4259d6902596e6 in lucene-solr's branch 
refs/heads/branch_7x from [~romseygeek]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=4add301 ]

LUCENE-7994: Add facets lib/ directory to IntelliJ setup


> Use int/int hash map for int taxonomy facet counts
> --------------------------------------------------
>
>                 Key: LUCENE-7994
>                 URL: https://issues.apache.org/jira/browse/LUCENE-7994
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>            Priority: Major
>             Fix For: master (8.0), 7.2
>
>         Attachments: LUCENE-7994.patch, LUCENE-7994.patch
>
>
> Int taxonomy facets today always count into a dense {{int[]}}, which is 
> wasteful in cases where the number of unique facet labels is high and the 
> size of the current result set is small.
> I factored the native hash map from LUCENE-7927 and use a simple heuristic 
> (customizable by the user by subclassing) to decide up front whether to count 
> sparse or dense.  I also made loading of the large children and siblings 
> {{int[]}} lazy, so that they are only instantiated if you really need them.



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