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Posted to issues@trafodion.apache.org by "Qifan Chen (JIRA)" <ji...@apache.org> on 2015/11/30 15:16:11 UTC
[jira] [Work started] (TRAFODION-1654) Need to check the UECs on
predicate-less key columns when consider MDAM
[ https://issues.apache.org/jira/browse/TRAFODION-1654?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Work on TRAFODION-1654 started by Qifan Chen.
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> Need to check the UECs on predicate-less key columns when consider MDAM
> -----------------------------------------------------------------------
>
> Key: TRAFODION-1654
> URL: https://issues.apache.org/jira/browse/TRAFODION-1654
> Project: Apache Trafodion
> Issue Type: Bug
> Components: sql-cmp
> Reporter: Qifan Chen
> Assignee: Qifan Chen
> Labels: performance
>
> When some key columns are predicate less, the current heuristics does not consider the UECs of these key columns, especially when the UECs are high.
> A better heuristics is to compute the product of all such UECs and assure the product is within a threshold.
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