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https://issues.apache.org/jira/browse/SOLR-14518?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17118993#comment-17118993
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Mikhail Khludnev edited comment on SOLR-14518 at 5/28/20, 7:38 PM:
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bq. uniqueBlock seems to be taking advantage of the existence of the root field
to calculate unique.
Right I've forgotten about it. {{uniqueBlock}} requires monotonicity across
blocks.
Regarding benchmark {{uniqueBlock}} provides gain only with {{limit:-1}}, also
recently we added a bitset option {{uniqueBlock(\{!v=type:product})}} it
doesn't need to read docValues and is supposed to be faster.
was (Author: mkhludnev):
bq. uniqueBlock seems to be taking advantage of the existence of the root field
to calculate unique.
Right I've forgotten about it. {{uniqueBlock}} requires monotonicity across
blocks.
Regarding benchmark {{uniqueBlock}} provides gain only with {{limit:-1}}, also
recently we added a bitset option {{uniqueBlock({!v=type:product})}} it don't
need to read docValues and is supposed to be faster.
> 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
> 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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