Add pushdown support for Searched CASE expression over a UNION
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Key: TEIID-1656
URL:
https://issues.jboss.org/browse/TEIID-1656
Project: Teiid
Issue Type: Enhancement
Components: Query Engine, Server
Affects Versions: 7.4, 7.1.1
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 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.
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