[jira] [Commented] (MARMOTTA-367) KiWi SPARQL: support for OPTIONAL

["ASF subversion and git services (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MARMOTTA-367?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14135212#comment-14135212 ] 

ASF subversion and git services commented on MARMOTTA-367:
----------------------------------------------------------

Commit 0921acaa1e310beef16aa7ebdfd00e4170f89f49 in marmotta's branch refs/heads/develop from [~wastl]
[ https://git-wip-us.apache.org/repos/asf?p=marmotta.git;h=0921aca ]

fix MARMOTTA-367 (OPTIONAL support) and MARMOTTA-494 (SPARQL builder)


> 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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