Andy Seaborne created JENA-2317:
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Summary: Apply BGP reorder before filter placement.
Key: JENA-2317
URL: https://issues.apache.org/jira/browse/JENA-2317
Project: Apache Jena
Issue Type: Improvement
Components: ARQ
Affects Versions: Jena 4.4.0
Reporter: Andy Seaborne
Assignee: Andy Seaborne
Fix For: Jena 4.5.0
The reordering of BGPs is usually left until execution because the pattern may
become more grounded during execution.
Filter are moved around during the optimization of the algebra. This can break
up BGPs by putting a filter in the middle of them and that then blocks
reordering. Specifically, a triple pattern with two ground terms (and the
property is not rdf:type) usually yields only a few results. But if we have a
BGP where first pattern is a triple pattern of one ground term and a
restriction on the object value (as occurs in BSBM Q5), reordering does not
find the better starting point.
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