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https://issues.apache.org/jira/browse/DERBY-6942?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16071405#comment-16071405
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Harshvardhan Gupta commented on DERBY-6942:
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Let me emphasize on this improvement in case of multiple joins: Although in the
above example my changes didn't change the cost (it shouldn't since during
execution by that conglomerate needs to do the same work), improvement in
cardinality estimates will help us avoid cascading errors during cost
estimation of joins.
> Utilise additional statistics for selectivity estimates.
> --------------------------------------------------------
>
> Key: DERBY-6942
> URL: https://issues.apache.org/jira/browse/DERBY-6942
> Project: Derby
> Issue Type: Sub-task
> Components: SQL
> Reporter: Harshvardhan Gupta
> Assignee: Harshvardhan Gupta
> Priority: Minor
> Attachments: DERBY-6942.diff, z12.txt, z13.txt
>
>
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