Simon Helsen created JENA-294:
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Summary: TransformFilterEquality does not handle starting OPTIONAL
well
Key: JENA-294
URL: https://issues.apache.org/jira/browse/JENA-294
Project: Apache Jena
Issue Type: Bug
Components: ARQ
Affects Versions: Jena 2.7.4
Reporter: Simon Helsen
There was one other case where our tests were stuck on a very slow query
execution because transformFilterEquality failed to optimize. The problem is
that the optimizer gives up whenever the WHERE clause starts with an OPTIONAL
clause. The reason is that the generated algebraic formula starts with a
TableUnit and this is not handled correctly.
I have attached a patch which fixes the problem
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