Joel Bernstein created SOLR-10436:
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Summary: 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
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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