[JENA-1198] Filter placement together with a property function can cause NPE.

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: Jena 3.1.1
• Component/s: TDB
• Assignee: Andy Seaborne
• Reporter: Andy Seaborne
• Created: 21/Jun/16 10:32
• Updated: 08/Nov/16 10:21
• Resolved: 21/Jun/16 11:45

Description

TDB sets filter placement within BGPs to false (it does it itself).

placePropertyFunctionProcedure does not handle the "no change" case properly. This arises when

placeOrWrapBGP => wrapBGP which happens in the TDB case but not memory graphs.placeBGP happens to always rebuild, wrapBGP does not.

SELECT ?s
WHERE {
    ?s ?p ?o .
    ?s <http://www.w3.org/2000/01/rdf-schema#member> ?m .
    FILTER (!bound(?test))
} 

causes:

org.apache.jena.sparql.algebra.optimize.TransformFilterPlacement.placePropertyFunctionProcedure(TransformFilterPlacement.java:453)
    at org.apache.jena.sparql.algebra.optimize.TransformFilterPlacement.placePropertyFunction(TransformFilterPlacement.java:432)
    at org.apache.jena.sparql.algebra.optimize.TransformFilterPlacement.transform(TransformFilterPlacement.java:200)
    at org.apache.jena.sparql.algebra.optimize.TransformFilterPlacement.transform(TransformFilterPlacement.java:159)
    at org.apache.jena.sparql.algebra.TransformWrapper.transform(TransformWrapper.java:59) 
...