[teiid-issues] [JBoss JIRA] (TEIID-4885) Costing issues

[Steven Hawkins (JIRA)]

     [ https://issues.jboss.org/browse/TEIID-4885?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Steven Hawkins resolved TEIID-4885.
-----------------------------------
    Resolution: Done


Addressed the issues and changed the predicate costing logic to use a smoother estimate for high ndv values.

> Costing issues
> --------------
>
>                 Key: TEIID-4885
>                 URL: https://issues.jboss.org/browse/TEIID-4885
>             Project: Teiid
>          Issue Type: Quality Risk
>          Components: Query Engine
>            Reporter: Steven Hawkins
>            Assignee: Steven Hawkins
>             Fix For: 9.3
>
>
> There were several deficiencies introduced with TEIID-4332 -
> In some circumstances very low ndv values on the large side of a join would cause a dependent join in an unexpected direction.
> The row estimate derived for a join without ndv information would tend to be too low, which would have a cumulative effect through further joins.  



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