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Posted to issues@tajo.apache.org by "Jihoon Son (JIRA)" <ji...@apache.org> on 2014/12/12 06:01:13 UTC

[jira] [Updated] (TAJO-1120) Enable collecting column stats when storing a table if necessary

     [ https://issues.apache.org/jira/browse/TAJO-1120?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jihoon Son updated TAJO-1120:
-----------------------------
    Fix Version/s:     (was: 0.9.1)
                   0.9.2

> Enable collecting column stats when storing a table if necessary
> ----------------------------------------------------------------
>
>                 Key: TAJO-1120
>                 URL: https://issues.apache.org/jira/browse/TAJO-1120
>             Project: Tajo
>          Issue Type: Improvement
>          Components: catalog
>            Reporter: Jihoon Son
>            Assignee: Jihoon Son
>             Fix For: 0.9.2
>
>
> Currently, the number of null values and the max/min values of a column are collected only in the shuffle stage.
> In addition, the number of distinct values of a column seems not to be collected in anywhere. 
> However, some recent issues such as TAJO-838 and TAJO-1091 require these statistics, and thus we need to collect them for tables that are newly stored via CTAS or INSERT INTO statements.



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