[jira] [Updated] (LUCENE-7994) Use int/int hash map for int taxonomy facet counts

["Michael McCandless (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-7994?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael McCandless updated LUCENE-7994:
---------------------------------------
    Attachment: LUCENE-7994.patch

Patch; I think it's ready.

{{FloatTaxonomyFacets}} could also be improved but let's save that for a later issue.

> 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
>             Fix For: master (8.0), 7.2
>
>         Attachments: 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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