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https://issues.apache.org/jira/browse/SOLR-6968?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hoss Man updated SOLR-6968:
---------------------------
    Attachment: SOLR-6968_nosparse.patch

patch that worked well in my perf tests to disable SPARSE (and optimize some 
ram usage when merging EMPTY) ... will commit once {{ant precommit test}} 
finishes.

> add hyperloglog in statscomponent as an approximate count
> ---------------------------------------------------------
>
>                 Key: SOLR-6968
>                 URL: https://issues.apache.org/jira/browse/SOLR-6968
>             Project: Solr
>          Issue Type: Sub-task
>            Reporter: Hoss Man
>            Assignee: Hoss Man
>             Fix For: Trunk, 5.2
>
>         Attachments: SOLR-6968.patch, SOLR-6968.patch, SOLR-6968.patch, 
> SOLR-6968.patch, SOLR-6968.patch, SOLR-6968.patch, SOLR-6968_nosparse.patch
>
>
> stats component currently supports "calcDistinct" but it's terribly 
> inefficient -- especially in distib mode.
> we should add support for using hyperloglog to compute an approximate count 
> of distinct values (using localparams via SOLR-6349 to control the precision 
> of the approximation)



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