[teiid-issues] [JBoss JIRA] Created: (TEIID-1272) Join planning should make better decisions when mixing costing and unknown values
Steven Hawkins (JIRA)
jira-events at lists.jboss.org
Wed Sep 22 14:56:28 EDT 2010
Join planning should make better decisions when mixing costing and unknown values
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Key: TEIID-1272
URL: https://jira.jboss.org/browse/TEIID-1272
Project: Teiid
Issue Type: Quality Risk
Components: Query Engine
Affects Versions: 7.0
Reporter: Steven Hawkins
Assignee: Steven Hawkins
Fix For: 7.1.1
When faced with an unknown value during join planning we use the default assumption of 100000 rows. However this may cause non-performant cross joins to be pushed in the worst case. It would be better to either not cost these scenarios or get a more accurate estimate of the post join cardinality based upon the the other side of the join.
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