[jira] [Created] (SOLR-8556) Add ConcatOperation to be used with the SelectStream

["Joel Bernstein (JIRA)" <ji...@apache.org>]

Joel Bernstein created SOLR-8556:
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             Summary: Add ConcatOperation to be used with the SelectStream
                 Key: SOLR-8556
                 URL: https://issues.apache.org/jira/browse/SOLR-8556
             Project: Solr
          Issue Type: New Feature
            Reporter: Joel Bernstein


Now that we have the UpdateStream it would be nice to support the use case of sending rolled up aggregates for storage in another SolrCloud collection. To support we'll need to create ID's for the aggregate records.

The ConcatOperation would allows us to concatenate the bucket values into a unique id. For example:

{code}
update(
            select( 
                         rollup(search()), 
                         concat(fields="a,b,c", delim="_",  as="id")))
{code}



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