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From "Thomas Tauber-Marshall (JIRA)" <j...@apache.org>
Subject [jira] [Created] (IMPALA-5498) Support for partial sorts
Date Tue, 13 Jun 2017 16:29:00 GMT
Thomas Tauber-Marshall created IMPALA-5498:
----------------------------------------------

             Summary: Support for partial sorts
                 Key: IMPALA-5498
                 URL: https://issues.apache.org/jira/browse/IMPALA-5498
             Project: IMPALA
          Issue Type: Improvement
          Components: Backend
    Affects Versions: Impala 2.10.0
            Reporter: Thomas Tauber-Marshall
            Assignee: Thomas Tauber-Marshall


Impala's sorting code currently only allows for full sorts, but it could be extended to support
partial sorts.

This would be useful in situations where the sorting is being done for performance rather
than correctness. For example, a recent change (IMPALA-3742) sorts rows for an INSERT before
sending them to Kudu. Doing only a partial sort could speed this up and reduce the memory
required while still retaining the primary benefit of reducing the load on Kudu.



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