[teiid-issues] [JBoss JIRA] Resolved: (TEIID-38) supported non-deterministic functions are evaluated prior to push-down

[Steven Hawkins (JIRA)]

     [ https://jira.jboss.org/jira/browse/TEIID-38?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Steven Hawkins resolved TEIID-38.
---------------------------------

    Resolution: Won't Fix


Our approach to non-deterministic functions is not common among vendors.  Preventing further push-down seems to be the wrong thing to do.  We should simply live for now with the possibility that a non-deterministic push down may not yield the same result had it not been pushed down.

> supported non-deterministic functions are evaluated prior to push-down
> ----------------------------------------------------------------------
>
>                 Key: TEIID-38
>                 URL: https://jira.jboss.org/jira/browse/TEIID-38
>             Project: Teiid
>          Issue Type: Bug
>          Components: Query Engine
>    Affects Versions: 6.x
>            Reporter: Steven Hawkins
>            Priority: Optional
>             Fix For: 6.1.0
>
>
> Defect Tracker #24735: We currently will not actually push down non-deterministic functions even if they are supported, since the evaluateexpressionvisitor will replace them with constant values.  For example rand will be pre-evaluated before being sent to sqlserver (however sqlserver does not correctly support non-deterministic functions anyway).  We may need to actually not support non-deterministic functions in sqlserver or other sources that do not handle them properly.

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