[teiid-issues] [JBoss JIRA] (TEIID-1990) UNION pushdown

Wed Apr 4 00:54:47 EDT 2012

    [ https://issues.jboss.org/browse/TEIID-1990?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12681476#comment-12681476 ] 

Mark Addleman commented on TEIID-1990:
--------------------------------------

The execution factory subclasses JDBCExecutionFactory and only overrides supportsRowOffect as false.  supportSelectExpression returns true.

> UNION pushdown
> --------------
>
>                 Key: TEIID-1990
>                 URL: https://issues.jboss.org/browse/TEIID-1990
>             Project: Teiid
>          Issue Type: Bug
>            Reporter: Mark Addleman
>            Assignee: Steven Hawkins
>         Attachments: plan.txt, plan.txt
>
>
> I have SQL of the form
> SELECT a FROM (
>    SELECT a FROM ds.t1 UNION
>    SELECT a FROM ds.t2
> ) t
> The execution factory extends JDBCExecutionFactory and supports everything except row offset.  It appears that the two unioned SELECTs are being executed as separate statements rather than the entire unioned set being pushed down to the datasource.
> Attached is plan

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