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https://issues.apache.org/jira/browse/SOLR-14518?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17118178#comment-17118178
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Joel Bernstein commented on SOLR-14518:
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There are two ways to co-locate records data on the same shard, one is block
join and the other is composite id routing. This would provide fast unique
functionality for those that are using composite id routing.
> Add support for partitioned unique agg to JSON facets
> -----------------------------------------------------
>
> Key: SOLR-14518
> URL: https://issues.apache.org/jira/browse/SOLR-14518
> Project: Solr
> Issue Type: New Feature
> Security Level: Public(Default Security Level. Issues are Public)
> Components: Facet Module
> Reporter: Joel Bernstein
> Priority: Major
>
> There are scenarios where documents are partitioned across shards based on
> the same field that the *unique* agg is applied to with JSON facets. In this
> scenario exact unique counts can be calculated by simply sending the bucket
> level unique counts to the aggregator where they can be summed. Suggested
> syntax is to add a boolean flag to the unique aggregation function:
> *unique*(partitioned_field, true).
> The *true* value turns on the "partitioned" unique logic. The default is
> false.
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