You are viewing a plain text version of this content. The canonical link for it is here.

Posted to issues@trafodion.apache.org by "Qifan Chen (JIRA)" <ji...@apache.org> on 2015/12/09 15:13:11 UTC

[jira] [Resolved] (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 ]

Qifan Chen resolved TRAFODION-1654.
-----------------------------------
    Resolution: Fixed

> 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. 



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)