[teiid-issues] [JBoss JIRA] (TEIID-2571) Generally allow must pushdown function evaluation

[Steven Hawkins (JIRA)]

     [ https://issues.jboss.org/browse/TEIID-2571?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Steven Hawkins resolved TEIID-2571.
-----------------------------------

    Resolution: Done


Added an initial implementation that is a simple / late evaluation of must pushdown functions tied to a schema one at a time.

If this feature gets more use, then we'll want to address:
- multi-source support to select a single source to execute the function against
- grouping function calls together

TEIID-1131 now has a clearer implementation path as imported sequence functions will function as expected as must pushdown functions
                
> Generally allow must pushdown function evaluation
> -------------------------------------------------
>
>                 Key: TEIID-2571
>                 URL: https://issues.jboss.org/browse/TEIID-2571
>             Project: Teiid
>          Issue Type: Enhancement
>          Components: Connector API, Query Engine
>            Reporter: Steven Hawkins
>            Assignee: Steven Hawkins
>             Fix For: 8.5
>
>
> A must pushdown function not associated with an access node will fail to evaluate.  We can initially improve upon this with translator that support "select without from" to issue a scalar select of the value.
> We can also enhance planning to group all such accesses to prevent multiple calls and to determine a possible source target if the function is not associated with a source schema.

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