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https://issues.apache.org/jira/browse/SOLR-14518?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17118174#comment-17118174
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Joel Bernstein commented on SOLR-14518:
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To follow the *uniqueBlock* convention we could also create a new function
called *uniqueShard*. The same basic idea as uniqueBlock just without the need
for a block join.
> 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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