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From "Min Zhou (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (TAJO-283) Add Table Partitioning
Date Wed, 18 Dec 2013 07:25:07 GMT

    [ https://issues.apache.org/jira/browse/TAJO-283?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13851464#comment-13851464
] 

Min Zhou commented on TAJO-283:
-------------------------------

Thanks for the explanation.  I noticed that  the files generated by ColumnPartitionedTableStoreExec
is in child directories of staging dir, typically those files should be on hdfs.   If we scan
a regular table and insert it to a partitioned table, there is no data shuffling, just like
a map-only hash, right? 

> Add Table Partitioning
> ----------------------
>
>                 Key: TAJO-283
>                 URL: https://issues.apache.org/jira/browse/TAJO-283
>             Project: Tajo
>          Issue Type: New Feature
>          Components: catalog, physical operator, planner/optimizer
>            Reporter: Hyunsik Choi
>            Assignee: Hyunsik Choi
>             Fix For: 0.8-incubating
>
>
> Table partitioning gives many facilities to maintain large tables. First of all, it enables
the data management system to prune many input data which are actually not necessary. In addition,
it gives the system more optimization  opportunities  that exploit the physical layouts.
> Basically, Tajo should follow the RDBMS-style partitioning system, including range, list,
hash, and so on. In order to keep Hive compatibility, we need to add Hive partition type that
does not exists in existing DBMS systems.



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