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Posted to issues@trafodion.apache.org by "Suresh Subbiah (JIRA)" <ji...@apache.org> on 2015/10/05 18:22:26 UTC
[jira] [Reopened] (TRAFODION-607) LP Bug: 1367398 - enable
statistics for hive tables
[ https://issues.apache.org/jira/browse/TRAFODION-607?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Suresh Subbiah reopened TRAFODION-607:
--------------------------------------
Assignee: Suresh Subbiah (was: Barry Fritchman)
We need to check if Hive scan operator is enabled to use heuristics from stats (now that it is available) to decide when to use CIF.
> LP Bug: 1367398 - enable statistics for hive tables
> ---------------------------------------------------
>
> 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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