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Posted to issues@trafodion.apache.org by "Suresh Subbiah (JIRA)" <ji...@apache.org> on 2015/10/06 23:19:27 UTC

[jira] [Updated] (TRAFODION-607) LP Bug: 1367398 - Use Hive statistics to enable CIF for Hive scan

     [ https://issues.apache.org/jira/browse/TRAFODION-607?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Suresh Subbiah updated TRAFODION-607:
-------------------------------------
    Summary: LP Bug: 1367398 - Use Hive statistics to enable CIF for Hive scan  (was: LP Bug: 1367398 - enable statistics for hive tables)

> LP Bug: 1367398 - Use Hive statistics to enable CIF for Hive scan
> -----------------------------------------------------------------
>
>                 Key: TRAFODION-607
>                 URL: https://issues.apache.org/jira/browse/TRAFODION-607
>             Project: Apache Trafodion
>          Issue Type: Wish
>          Components: sql-cmp
>            Reporter: Apache Trafodion
>            Assignee: Suresh Subbiah
>            Priority: Minor
>
> the CIF heuristic relies on the statistics to decide which row format (aligned or exploded) to use.  
> we also need to be able to get the average varchar size for each varchar field.
> the statistics information will allow cif to deicide the row format correctly and may have a tremendous impact on performance



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