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From "Jason Altekruse (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DRILL-3323) Flatten planning rule creates unneeded copy of the list being flattened, causes executuion/allocation issues with large lists
Date Fri, 19 Jun 2015 17:13:01 GMT
Jason Altekruse created DRILL-3323:
--------------------------------------

             Summary: Flatten planning rule creates unneeded copy of the list being flattened,
causes executuion/allocation issues with large lists
                 Key: DRILL-3323
                 URL: https://issues.apache.org/jira/browse/DRILL-3323
             Project: Apache Drill
          Issue Type: Bug
          Components: Execution - Flow
            Reporter: Jason Altekruse
            Assignee: Jason Altekruse
             Fix For: 1.1.0


The planning rule for flatten was written to not only handle the flatten operator, but it
also was designed to address some shortcomings in expression evaluation involving complex
types. The rule currently plans inefficiently to try to cover some of these more advanced
cases, but there is not thorough test coverage to even demonstrate the benefits of it. We
should disable a particular behavior of copying complex data and extra time when it is not
needed, because it is causing flatten queries to fail with allocation issues. 



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