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Posted to issues@tajo.apache.org by "Jihoon Son (JIRA)" <ji...@apache.org> on 2015/11/12 05:57:10 UTC

[jira] [Created] (TAJO-1975) Gathering fine-grained column statistics

Jihoon Son created TAJO-1975:
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             Summary: Gathering fine-grained column statistics
                 Key: TAJO-1975
                 URL: https://issues.apache.org/jira/browse/TAJO-1975
             Project: Tajo
          Issue Type: Task
            Reporter: Jihoon Son
            Assignee: Jihoon Son
             Fix For: 0.12.0, 0.11.1


One of the stages where statistics is very useful is the shuffle stage during query execution.Tajo also utilizes statistics for range shuffle. 

Currently, once gathering statistics is enabled, it is collected on every column of the input schema rather than the shuffle key columns. This may cause unnecessary overhead, so we need to collect statistics on only the shuffle keys.



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