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https://issues.apache.org/jira/browse/LUCENE-7994?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16237620#comment-16237620
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ASF subversion and git services commented on LUCENE-7994:
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Commit 1d2787464f4709f4960716dd3314c7123324b15b in lucene-solr's branch
refs/heads/master from [~romseygeek]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=1d27874 ]
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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