[teiid-issues] [JBoss JIRA] (TEIID-3205) Push down supported select expression even if other select expressions are not supported by the source

[Steven Hawkins (JIRA)]

     [ https://issues.jboss.org/browse/TEIID-3205?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Steven Hawkins resolved TEIID-3205.
-----------------------------------
    Resolution: Done


Added initial support based upon pushing to a direct descendant access node during the last run of rule assign output elements (similar to the existing logic handling must pushdown functions).  This is not the same as a complete notion of partial projection pushing - that would require quite a bit more code.  However the current solution will only work in simplistic scenarios and is not based upon a notion of cost (that is a general rule would push projections based upon where the evaluation was least expensive).

> Push down supported select expression even if other select expressions are not supported by the source
> ------------------------------------------------------------------------------------------------------
>
>                 Key: TEIID-3205
>                 URL: https://issues.jboss.org/browse/TEIID-3205
>             Project: Teiid
>          Issue Type: Bug
>          Components: Query Engine
>    Affects Versions: 8.7
>            Reporter: Sanjeev Gour
>            Assignee: Steven Hawkins
>             Fix For: 8.10
>
>
> If the source supports for example the searched case expression and does not support a custom function, having both in the select caused searched case expression not to be pushed. More details are here-
> https://developer.jboss.org/message/909439#909439



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