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From "Min Zhou (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (TAJO-283) Add Table Partitioning
Date Wed, 18 Dec 2013 18:00:13 GMT

    [ https://issues.apache.org/jira/browse/TAJO-283?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13851968#comment-13851968
] 

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

Great! thanks for the information.

I was considering about the small hdfs files issue if we won't do a merge through shuffle.
The file number should be M * R,  where M is the mapper tasks number and R is the reducer
tasks number.  If data shuffling is added, files numbers would drop into R.


> 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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