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https://issues.apache.org/jira/browse/SOLR-10436?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joel Bernstein updated SOLR-10436:
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Attachment: SOLR-10346.patch
Basic implementation, test to follow.
> Add hashRollup Streaming Expression
> -----------------------------------
>
> Key: SOLR-10436
> URL: https://issues.apache.org/jira/browse/SOLR-10436
> Project: Solr
> Issue Type: New Feature
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Joel Bernstein
> Attachments: SOLR-10346.patch
>
>
> The *hashRollup* Streaming Expression performs group by aggregations by
> keeping all the groups in an in-memory HashMap. The existing *rollup*
> expression requires that the tuples be sorted by the group by fields. The
> hashRollup will not have the sorting requirement, but it will also not have
> support for unlimited cardinality, like the rollup expression.
> The *hashRollup* or *rollup* can then be chosen based on the requirements of
> the query.
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