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https://issues.apache.org/jira/browse/SOLR-6968?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14542290#comment-14542290
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ASF subversion and git services commented on SOLR-6968:
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Commit 1679250 from [email protected] in branch 'dev/branches/branch_5x'
[ https://svn.apache.org/r1679250 ]
SOLR-6968: perf tweak: eliminate use of SPARSE storage option since it has some
pathologically bad behavior for some set sizes (particularly when merging shard
responses) (merge r1679241)
> 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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