[teiid-issues] [JBoss JIRA] (TEIID-4099) Improve with clause performance with incremental materialization
Steven Hawkins (JIRA)
issues at jboss.org
Thu Oct 12 15:10:00 EDT 2017
[ https://issues.jboss.org/browse/TEIID-4099?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Work on TEIID-4099 started by Steven Hawkins.
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> Improve with clause performance with incremental materialization
> ----------------------------------------------------------------
>
> Key: TEIID-4099
> URL: https://issues.jboss.org/browse/TEIID-4099
> Project: Teiid
> Issue Type: Enhancement
> Components: Query Engine
> Reporter: Steven Hawkins
> Assignee: Steven Hawkins
> Fix For: 10.0
>
>
> When a with clause item is first referenced it is fully materialized before use. We should generally allow iterative processing for full table scans - in scenarios where the table hasn't been augmented to add inferred indexes.
> Another possible improvement to consider would be to fully analyse the predicates used against the common table to determine if a disjunct of all would limit the rows needed.
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