Andy Seaborne created JENA-754:
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Summary: Avoid using a wrapper dataset for SPARQL Update WITH
Key: JENA-754
URL: https://issues.apache.org/jira/browse/JENA-754
Project: Apache Jena
Issue Type: Bug
Components: ARQ
Affects Versions: Jena 2.11.2
Reporter: Andy Seaborne
Assignee: Andy Seaborne
Priority: Minor
When processing a SPARQL Update operation that uses WITH, the processing engine
crates a wrapper dataset {{DatasetGraphAltDefaultGraph}} that catches access to
the default graph and directs it to the alternative graph.
This can block optimization of the graph pattern because
DatasetGraphAltDefaultGraph masks the true storage layer and will use the
default query pattern executor ({{OpExecutor}} and {{StageGeneratorGeneric}}).
This is not too serious now that the generic process does some optimization but
it can be improved by modifying the WHERE clause to wrap it in a GRAPH <URI>
{...} using {{ElementGraph}} and not using a wrapper dataset. The pattern
matching proceeds to the underlying storage engine as normal.
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