[teiid-issues] [JBoss JIRA] Updated: (TEIID-1656) Add pushdown support for grouping expression over a UNION
Steven Hawkins (JIRA)
jira-events at lists.jboss.org
Mon Jun 27 14:55:23 EDT 2011
[ https://issues.jboss.org/browse/TEIID-1656?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Steven Hawkins updated TEIID-1656:
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Summary: Add pushdown support for grouping expression over a UNION (was: Add pushdown support for Searched CASE expression over a UNION)
Description:
1) User has created a view MyView containing UNION all of two other views, eg "SELECT * FROM View1 UNION ALL SELECT * FROM View 2".
2) Then a user query containing a searched CASE type expression is submitted against the view, eg "SELECT max(col) FROM MyView group by CASE WHEN StringNum IS NULL THEN 0 ELSE 1 END"
3) With current planner the CASE expression / group by is not pushed down to the individual sources. The enhancement request is to allow the pushdown.
was:
1) User has created a view MyView containing UNION all of two other views, eg "SELECT * FROM View1 UNION ALL SELECT * FROM View 2".
2) Then a user query containing a searched CASE type expression is submitted against the view, eg "SELECT CASE WHEN StringNum IS NULL THEN 0 ELSE 1 END FROM MyView"
3) With current planner the CASE expression is not pushed down to the individual sources. The enhancement request is to allow the pushdown.
Component/s: (was: Server)
> Add pushdown support for grouping expression over a UNION
> ---------------------------------------------------------
>
> Key: TEIID-1656
> URL: https://issues.jboss.org/browse/TEIID-1656
> Project: Teiid
> Issue Type: Enhancement
> Components: Query Engine
> Affects Versions: 7.1.1, 7.4
> Reporter: Mark Drilling
> Assignee: Steven Hawkins
> Fix For: 7.4.1
>
>
> 1) User has created a view MyView containing UNION all of two other views, eg "SELECT * FROM View1 UNION ALL SELECT * FROM View 2".
> 2) Then a user query containing a searched CASE type expression is submitted against the view, eg "SELECT max(col) FROM MyView group by CASE WHEN StringNum IS NULL THEN 0 ELSE 1 END"
> 3) With current planner the CASE expression / group by is not pushed down to the individual sources. The enhancement request is to allow the pushdown.
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