[
https://issues.apache.org/jira/browse/STANBOL-222?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Rupert Westenthaler resolved STANBOL-222.
-----------------------------------------
Resolution: Fixed
Fixed with revision 1136059
Sorry forgot to mention this Issue in the commit
Here the related comments:
### FieldQuery to SPARQL
Based on the feedback provided by Andrea several improvements to the generated
SPARQL queries where made (see http://markmail.org/thread/wxd4rdjcssi5b4u6 for
details)
* Fixed a bug in the full text search optimization for Virtuoso that prevented
results for queries containing spaces.
* The usage of SPARQL 1.1 sub-select should solve problems with LIMIT.
Currently sub-selects are only supported by Virtuoso.
* OPTIONAL selects are now only selected for previously selected entities. This
greatly improves performance in such cases
for details see: http://svn.apache.org/viewvc?rev=1136059&view=rev
> Timeout exception from LOD remote endpoints when performing queries with the
> Entity Hub.
> ----------------------------------------------------------------------------------------
>
> Key: STANBOL-222
> URL: https://issues.apache.org/jira/browse/STANBOL-222
> Project: Stanbol
> Issue Type: Bug
> Components: Entity Hub
> Reporter: Andrea Nuzzolese
> Assignee: Rupert Westenthaler
>
> The sparql constructs serialized by the Entity Hub that is used for querying
> remote LOD endpoints contain OPTIONAL patterns that require too much time to
> be evaluated.
> An example is the following
> CONSTRUCT { ... }
> WHERE {
> { {?id <http://www.w3.org/2002/07/owl#sameAs>
> <http://www4.wiwiss.fu-berlin.de/factbook/resource/United_States> }}
> { OPTIONAL { ?id <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
> ?v_1 . } }
> { OPTIONAL { ?id <http://www.w3.org/2000/01/rdf-schema#label> ?v_2 . }
> }
> }
> ...
> The sparql engine tries to satisfy the optional clauses in the whole graph
> ignoring the first condition ?id <http://www.w3.org/2002/07/owl#sameAs>
> <http://www4.wiwiss.fu-berlin.de/factbook/resource/United_States>
--
This message is automatically generated by JIRA.
For more information on JIRA, see: http://www.atlassian.com/software/jira
