Joel Bernstein created SOLR-8281:
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Summary: Add RollupMergeStream to Streaming API
Key: SOLR-8281
URL: https://issues.apache.org/jira/browse/SOLR-8281
Project: Solr
Issue Type: Bug
Reporter: Joel Bernstein
The RollupMergeStream merges the aggregate results emitted by the RollupStream
on *worker* nodes.
This is designed to be used in conjunction with the HashJoinStream to perform
rollup Aggregations on the joined Tuples. The HashJoinStream will require the
tuples to be partitioned on the Join keys. To avoid needing to repartition on
the *group by* fields for the RollupStream, we can perform a merge of the
rolled up Tuples coming from the workers.
The construct would like this:
{code}
mergeRollup (...
parallel (...
hashJoin (
search(...),
search(...),
on="fieldA"
)
)
)
{code}
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