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https://issues.apache.org/jira/browse/MARMOTTA-367?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sebastian Schaffert resolved MARMOTTA-367.
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Resolution: Fixed
Fix Version/s: 3.3.0
> KiWi SPARQL: support for OPTIONAL
> ---------------------------------
>
> Key: MARMOTTA-367
> URL: https://issues.apache.org/jira/browse/MARMOTTA-367
> Project: Marmotta
> Issue Type: Sub-task
> Components: KiWi Triple Store
> Affects Versions: 3.1-incubating
> Reporter: Sebastian Schaffert
> Assignee: Sebastian Schaffert
> Fix For: 3.3.0
>
>
> The OPTIONAL construct is very popular among SPARQL users, but currently not
> directly supported by the KiWi SPARQL optimizations. We should investigate
> how OPTIONAL can properly be translated into a SQL LEFT OUTER JOIN to improve
> the performance of such queries.
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