| Key: |
SES-409
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| Type: |
Bug
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| Status: |
Closed
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| Resolution: |
Fixed
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| Priority: |
Minor
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| Assignee: |
Unassigned
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| Reporter: |
Jeen Broekstra
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| Votes: |
0
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| Watchers: |
0
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Issue Links:
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Dependency
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This issue is a dependency for:
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SES-421
update SPARQL support to the CR of 14...
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SPARQL has adopted a semantics for the OPTIONAL clause which essentially reduces it a LeftJoin. In Sesame, we have an depth-first evaluation approach for SPARQL queries. In corner cases, this is not quite compatible with the official semantics of SPARQL.
The corner case is that of queries which contain patterns which are not "well designed". See http://iswc2006.semanticweb.org/items/Arenas2006bv.pdf : Perez. et al., "Semantics and Complexity of SPARQL", section 4.2, for a definition of this notion.
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Change by Jeen Broekstra [14/Jun/07 11:33 AM]
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Description
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SPARQL has adopted a semantics for the OPTIONAL clause which essentially reduces it a LeftJoin. In Sesame, we have an depth-first evaluation approach for SPARQL queries. In corner cases, this is not quite compatible with the official semantics of SPARQL.
The corner case is that of queries which contain patterns which are not "well designed". See <a href =http://iswc2006.semanticweb.org/items/Arenas2006bv.pdf>Perez. et al., "Semantics and Complexity of SPARQL"</a>, section 4.2, for a definition of this notion.
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SPARQL has adopted a semantics for the OPTIONAL clause which essentially reduces it a LeftJoin. In Sesame, we have an depth-first evaluation approach for SPARQL queries. In corner cases, this is not quite compatible with the official semantics of SPARQL.
The corner case is that of queries which contain patterns which are not "well designed". See <a href =http://iswc2006.semanticweb.org/items/Arenas2006bv.pdf>Perez. et al., "Semantics and Complexity of SPARQL"</a>, section 4.2, for a definition of this notion.
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Change by Jeen Broekstra [14/Jun/07 11:34 AM]
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| Field |
Original Value |
New Value |
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Description
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SPARQL has adopted a semantics for the OPTIONAL clause which essentially reduces it a LeftJoin. In Sesame, we have an depth-first evaluation approach for SPARQL queries. In corner cases, this is not quite compatible with the official semantics of SPARQL.
The corner case is that of queries which contain patterns which are not "well designed". See <a href =http://iswc2006.semanticweb.org/items/Arenas2006bv.pdf>Perez. et al., "Semantics and Complexity of SPARQL"</a>, section 4.2, for a definition of this notion.
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SPARQL has adopted a semantics for the OPTIONAL clause which essentially reduces it a LeftJoin. In Sesame, we have an depth-first evaluation approach for SPARQL queries. In corner cases, this is not quite compatible with the official semantics of SPARQL.
The corner case is that of queries which contain patterns which are not "well designed". See http://iswc2006.semanticweb.org/items/Arenas2006bv.pdf : Perez. et al., "Semantics and Complexity of SPARQL", section 4.2, for a definition of this notion.
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Change by Arjohn Kampman [06/Jul/07 11:11 AM]
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Fix Version/s
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2.0-beta6
[ 10270
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Fix Version/s
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2.0
[ 10080
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Affects Version/s
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2.0-beta5
[ 10260
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The corner cases ("non well-designed graph patterns") are now handled differently by the generic query engine.
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Change by Arjohn Kampman [07/Sep/07 11:38 AM]
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Status
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Open
[ 1
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Resolved
[ 5
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Resolution
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Fixed
[ 1
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Change by Arjohn Kampman [20/Mar/08 08:41 PM]
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Status
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Resolved
[ 5
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Closed
[ 6
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SPARQL OPTIONAL clause semantics not fully compatible