[teiid-issues] [JBoss JIRA] (TEIID-5420) Costing can over estimate join cardinality when no keys nor ndv is specified
Steven Hawkins (JIRA)
issues at jboss.org
Tue Jul 17 17:30:00 EDT 2018
[ https://issues.jboss.org/browse/TEIID-5420?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Steven Hawkins updated TEIID-5420:
----------------------------------
Fix Version/s: 11.0.1
> Costing can over estimate join cardinality when no keys nor ndv is specified
> ----------------------------------------------------------------------------
>
> Key: TEIID-5420
> URL: https://issues.jboss.org/browse/TEIID-5420
> Project: Teiid
> Issue Type: Quality Risk
> Components: Query Engine
> Reporter: Steven Hawkins
> Assignee: Steven Hawkins
> Fix For: 11.1, 11.0.1
>
>
> The changes from TEIID-4485 allow for joins lacking all but cardinality information to have their cardinality over-estimated. The estimate should be made more cautious by default as that would be the most common case.
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