[jira] [Created] (TAJO-574) Add a sort-based physical executor for column partition store

["Hyunsik Choi (JIRA)" <ji...@apache.org>]

Hyunsik Choi created TAJO-574:
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             Summary: Add a sort-based physical executor for column partition store
                 Key: TAJO-574
                 URL: https://issues.apache.org/jira/browse/TAJO-574
             Project: Tajo
          Issue Type: New Feature
          Components: physical operator
            Reporter: Hyunsik Choi
            Assignee: Hyunsik Choi
             Fix For: 0.8-incubating


ColumnPartitionStoreExec keeps numerous open files while it is storing all data. In addition, it's random write gives burden to HDFS namenode.

To solve this problem, I would like to propose a sort-based physical executor for column partition store. It assumes that input tuples are sorted in an ascending or descending order of partition keys. It means that it needs extra sort operation. But, it opens only one file simultaneously. It writes all data sequentially. In many cases, it would be the best choice for column partition store.



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