Jeremy Coulon created JENA-1519:
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Summary: OpWalkerVisitor should interact better with custom
operators
Key: JENA-1519
URL: https://issues.apache.org/jira/browse/JENA-1519
Project: Apache Jena
Issue Type: Bug
Components: ARQ
Affects Versions: Jena 3.6.0
Reporter: Jeremy Coulon
When visiting an OpExt, current implementation of OpWalkerVisitor is just
calling the visitor on opExt.effectiveOp().
However if OpExt is replacing a sub-tree of the algebra instead of a single
leaf node, the sub-tree is ignored by walker.
I found this bug when trying to execute a query with a MINUS operator with
either side of the operator being replaced by an custom operator.
For example the following query is not working, if I transform both side of
MINUS with a custom operator:
{{(project (?animal)}}
{{ (minus}}
{{ (bgp (triple ?animal rdf:type ex:Animal))}}
{{ (filter (|| (= ?type ex:Reptile) (= ?type ex:Insect))}}
{{ (bgp (triple ?animal rdf:type ?type)))))}}
which I transform into:
{{(project (?animal)}}
{{ (minus}}
{{ (op-ext )}}
{{ (op-ext )))}}
The reason is that MINUS is calling OpVars.visibleVars() which does not walk
into the subop of the filter.
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