[teiid-issues] [JBoss JIRA] (TEIID-5532) Common table projection minimization does not account for usage in a subquery nested in an aggregate

[Steven Hawkins (Jira)]

Steven Hawkins created TEIID-5532:
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             Summary: Common table projection minimization does not account for usage in a subquery nested in an aggregate
                 Key: TEIID-5532
                 URL: https://issues.jboss.org/browse/TEIID-5532
             Project: Teiid
          Issue Type: Bug
          Components: Query Engine
            Reporter: Steven Hawkins
            Assignee: Steven Hawkins
             Fix For: 11.0.3, 11.1.2, 12.0, 11.2.1


Nesting the usage of a common table in an aggregate means that the columns can be removed inappropriately by projection minimization.  A query such as:

with CTE1 as /*+ no_inline */ (SELECT e1, e2, e3 from pm1.g1) 
select array_agg((select e3 from cte1 where e1=pm1.g2.e1 and e2=pm1.g2.e2)) from pm1.g2

will return null values for all e3 as projection minimization of CTE1 will replace the column with a null value.



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