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Posted to issues@trafodion.apache.org by "Alice Chen (JIRA)" <ji...@apache.org> on 2015/07/22 20:17:53 UTC

[jira] [Created] (TRAFODION-705) LP Bug: 1383835 - null count inaccurate for estimated rowcount

Alice Chen created TRAFODION-705:
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             Summary: LP Bug: 1383835 - null count inaccurate for estimated rowcount
                 Key: TRAFODION-705
                 URL: https://issues.apache.org/jira/browse/TRAFODION-705
             Project: Apache Trafodion
          Issue Type: Bug
            Reporter: Barry Fritchman
            Assignee: Barry Fritchman


When an HBase table's row count is estimated, the number of KeyValues is adjusted by the estimated number of nulls, as represented by missing KeyValues in a sampling of rows. The count of nulls can be inaccurate in the rare case that all columns in a row except the (single-column) primary key are null.  This reduces the accuracy of the row count estimate.



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