[teiid-issues] [JBoss JIRA] (TEIID-5532) Common table projection minimization does not account for usage in a subquery nested in an aggregate or in some view scenarios
Steven Hawkins (Jira)
issues at jboss.org
Tue Nov 13 09:58:00 EST 2018
[ https://issues.jboss.org/browse/TEIID-5532?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Steven Hawkins reopened TEIID-5532:
-----------------------------------
Reopening to address the performance issue. I'll probably just restrict the minimization to run for only user queries.
> Common table projection minimization does not account for usage in a subquery nested in an aggregate or in some view scenarios
> ------------------------------------------------------------------------------------------------------------------------------
>
> 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
> Priority: Blocker
> 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.
> A similar situation occurs when the query above is defined instead in a view. A similar issue was captured on TEIID-5535
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