[teiid-issues] [JBoss JIRA] (TEIID-964) Must pushdown functions in select clause

[Steven Hawkins (Resolved) (JIRA)]

     [ https://issues.jboss.org/browse/TEIID-964?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Steven Hawkins resolved TEIID-964.
----------------------------------

      Assignee: Steven Hawkins
    Resolution: Done


Added support for pushing must pushdown functions in the select clause.  

The logic could be expended later into more general projection/subexpression pushing that works on all clauses.
                
> Must pushdown functions in select clause
> ----------------------------------------
>
>                 Key: TEIID-964
>                 URL: https://issues.jboss.org/browse/TEIID-964
>             Project: Teiid
>          Issue Type: Feature Request
>          Components: Query Engine
>    Affects Versions: 6.0.0
>            Reporter: Steven Hawkins
>            Assignee: Steven Hawkins
>             Fix For: 7.6
>
>
> (F_ATM_REPORT_TYPE is a DB function) 
> SELECT F_ATM_REPORT_TYPE (BUS_LINE_CODE) FROM ...
> Will not have the function pushed down if it only appears in the select clause.  The planner must check if a function is pushdown only when it appears in the select clause and determine a source to push it to.

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