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

Tue Apr 3 17:13:47 EDT 2012

    [ https://issues.jboss.org/browse/TEIID-1990?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12681433#comment-12681433 ] 

Steven Hawkins commented on TEIID-1990:
---------------------------------------

You'll want to check the showplan debug output and see what is inhibiting pushdown.

> 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
>
>
> 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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