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From "Jinfeng Ni (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DRILL-776) Support selection vector sv2 and sv4 in partition sender
Date Mon, 19 May 2014 18:42:38 GMT
Jinfeng Ni created DRILL-776:
--------------------------------

             Summary: Support selection vector sv2 and sv4 in partition sender 
                 Key: DRILL-776
                 URL: https://issues.apache.org/jira/browse/DRILL-776
             Project: Apache Drill
          Issue Type: Improvement
            Reporter: Jinfeng Ni
            Assignee: Jinfeng Ni


Currently, Partition sender does not accept sv2 or sv4. If the incoming batch is sv2 or sv4,
a SelectionVectorRemover (SVR) op is required to remove sv2 or sv4.   SVR is essentially doing
copy, while partition sender is doing copy as well. This would introduce unnecessary copy
to the whole query process.

In stead, we should enhance Partition sender so that it could take sv2 and sv4 directly, removing
the SVR's copy overhead. This would improve the query performance in terms of cpu and memory
consumption.




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