[teiid-issues] [JBoss JIRA] (TEIID-1990) UNION pushdown
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https://issues.jboss.org/browse/TEIID-1990?page=com.atlassian.jira.plugin...
]
Steven Hawkins commented on TEIID-1990:
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You'll want to check the showplan debug output and see what is inhibiting pushdown.
UNION pushdown
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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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