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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] [Created] (TRAFODION-1654) Need to check the UECs on predicate-less key columns when consider MDAM

Qifan Chen created TRAFODION-1654:
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             Summary: 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


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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