Andy Seaborne created JENA-1815:
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Summary: Join strategy/VarFinder: deal with assigned variables
(AS) differently to pattern defined variables.
Key: JENA-1815
URL: https://issues.apache.org/jira/browse/JENA-1815
Project: Apache Jena
Issue Type: Improvement
Affects Versions: Jena 3.13.1, Jena 3.14.0
Reporter: Andy Seaborne
Assignee: Andy Seaborne
The {{VarFinder}} treats assigned variables ({{AS ?var}}) in the same way as
variables set by pattern. In the sense that these two forms both set variables,
this is correct but "AS variables" can not be substituted for. At the moment
join classification says that a join is not "linear" (i.e. {{sequence}} can be
used) when assignment is encountered.
By classifying variables into substituable and non-substitutable, it should be
possible to do a better job of optimization choices of the join strategy.
This is motivated by JENA-1813.
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