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Posted to notifications@asterixdb.apache.org by "Ali Alsuliman (JIRA)" <ji...@apache.org> on 2018/02/15 06:30:02 UTC

[jira] [Created] (ASTERIXDB-2286) Parallel Sort Optimization

Ali Alsuliman created ASTERIXDB-2286:
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             Summary: Parallel Sort Optimization
                 Key: ASTERIXDB-2286
                 URL: https://issues.apache.org/jira/browse/ASTERIXDB-2286
             Project: Apache AsterixDB
          Issue Type: Improvement
          Components: COMP - Compiler, FUN - Functions, HYR - Hyracks
            Reporter: Ali Alsuliman


The current plan for queries with ORDER BY clauses consists of two phases; sorting the data locally in each partition and then sort-merging the data in one single partition. Even though the local sort happens in parallel, this effort is wasted by the fact that the merge is happening at one partition. It is desired to remove the merge step and do a true parallel sort where data is range-partitioned across the cluster.



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