[teiid-issues] [JBoss JIRA] (TEIID-4332) Enhance costing to better guess at ndv

[Steven Hawkins (JIRA)]

     [ https://issues.jboss.org/browse/TEIID-4332?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on TEIID-4332 started by Steven Hawkins.
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> Enhance costing to better guess at ndv
> --------------------------------------
>
>                 Key: TEIID-4332
>                 URL: https://issues.jboss.org/browse/TEIID-4332
>             Project: Teiid
>          Issue Type: Quality Risk
>          Components: Query Engine
>            Reporter: Steven Hawkins
>            Assignee: Steven Hawkins
>             Fix For: 9.1
>
>
> Our logic for determining ndv is mostly ad hoc and varies greatly depending upon the position in the plan.  This needs to be more standardized and based upon consistent assumptions - also additional information such as predicates and foreign keys should influence the calculation.



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