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Posted to dev@drill.apache.org by "Steven Phillips (JIRA)" <ji...@apache.org> on 2015/06/26 02:37:04 UTC

[jira] [Created] (DRILL-3381) Add option to distribute partition keys in CTAS

Steven Phillips created DRILL-3381:
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             Summary: Add option to distribute partition keys in CTAS
                 Key: DRILL-3381
                 URL: https://issues.apache.org/jira/browse/DRILL-3381
             Project: Apache Drill
          Issue Type: Bug
            Reporter: Steven Phillips


The current implementation does not redistribute, which would tend to result in a lot of extra files. Specifically, the number of files will be larger by a factor equal to the number of fragments in the final stage of the query. On even a moderately sized cluster, this number could easily be in the thousands, so a table with a 100 different partitions would end up with hundreds of thousands of files.

To allow a workaround for this situation, we should add an option to include an extra distribution, so that all the rows for any given partition are written from the same writer.



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