[teiid-issues] [JBoss JIRA] (TEIID-2878) Push ORDER/LIMIT for UNION query
Tom Arnold created TEIID-2878:
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Summary: Push ORDER/LIMIT for UNION query
Key: TEIID-2878
URL: https://issues.jboss.org/browse/TEIID-2878
Project: Teiid
Issue Type: Enhancement
Components: Query Engine
Affects Versions: 8.7
Reporter: Tom Arnold
Assignee: Steven Hawkins
Priority: Minor
Better support for queries on unions between different sources. ORDER BY is necessary on
the inner queries because otherwise the result set will be truncated too early. ORDER BY
can be hardcoded on the inner queries but this limits flexibility.
{code:sql}
create view v_items (...) as
select * from (
(select item_id, created_at, 'Foo' source from foo.items)
union all
(select item_id, created_at, 'Bar' source from bar.items)
) x;
-- Page 1.
select * from v_items order by created_at desc limit 0, 500;
-- Page 2.
select * from v_items order by created_at desc limit 500, 500;
{code}
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