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From "Aman Sinha (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DRILL-2260) Add support for partitioning files by certain criteria when doing a CTAS
Date Wed, 18 Feb 2015 01:07:13 GMT
Aman Sinha created DRILL-2260:
---------------------------------

             Summary: Add support for partitioning files by certain criteria when doing a
CTAS
                 Key: DRILL-2260
                 URL: https://issues.apache.org/jira/browse/DRILL-2260
             Project: Apache Drill
          Issue Type: Improvement
            Reporter: Aman Sinha
            Assignee: Jacques Nadeau


Doing a CTAS where we create a large number of files (thousands) is becoming increasingly
common.  In order to do partition pruning, we need to organize the files into subdirectories
such that Drill can expose the directory names as 'dir0', 'dir1' etc. and perform pruning.
 Currently, the organization of these files into subdirectories is a manual process and can
be tedious. 

We need to provide a mechanism to organize these output files into subdirectories without
manual intervention.  We could add a PARTITIONED BY <column> extension to the CTAS statement,
similar to what Hive does.  

One question is: suppose we partition by the Month column, do we remove that column from the
output files ? (since the column is represented by the subdirectories).  

Since this is a 'feature' that would span multiple components, I haven't categorized it. 



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