Use OpReduce instead of OpDistinct for DISTINCT + ORDER BY queries
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Key: JENA-90
URL: https://issues.apache.org/jira/browse/JENA-90
Project: Jena
Issue Type: Improvement
Components: ARQ
Reporter: Paolo Castagna
Priority: Trivial
ARQ's optimizer could use an OpReduce instead of OpDistinct if a query is
DISTINCT + ORDER BY.
OpReduce removes adjacent duplicates and it does not require a set of already
seen bindings as the current OpDistinct implementation does.
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