[jira] [Created] (SOLR-12829) Add plist (parallel list) Streaming Expressions

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

Joel Bernstein created SOLR-12829:
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             Summary: Add plist (parallel list) Streaming Expressions
                 Key: SOLR-12829
                 URL: https://issues.apache.org/jira/browse/SOLR-12829
             Project: Solr
          Issue Type: New Feature
      Security Level: Public (Default Security Level. Issues are Public)
            Reporter: Joel Bernstein


The *plist* Streaming Expression wraps any number of streaming expressions and opens them in parallel. The results of each of the streams is then iterated in the order they appear in the list. Since many streams perform heavy pushed down operations when opened, like the FacetStream, this will result in the parallelization of these operations. For example plist could wrap several facet() expressions and open them each in parallel, which would cause the facets to be run in parallel, on different replicas in the cluster. Here is sample syntax:
{code:java}
plist(tuple(facet1=facet(...)), 
      tuple(facet2=facet(...)),
      tuple(facet3=facet(...))){code}
 

 



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