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Bug #152

Exception on not-well-formed OPTIONAL queries

Added by Paula Gearon almost 14 years ago. Updated almost 14 years ago.

Status:
Closed
Priority:
High
Assignee:
Paula Gearon
Category:
Mulgara
Target version:
SPARQL Query Engine
Start date:
Due date:
% Done:

0%

Estimated time:
Resolution:
fixed

Description

The W3C test include the following:

Nested-optionals with a shared variable that does not appear in
  the middle pattern (a not well-formed query pattern as per
  "Semantics and Complexity" of SPARQL

The query is:

PREFIX : <http://example/>

SELECT *
{
 ?X  :name "paul" 
 {?Y :name "george" . OPTIONAL { ?X :email ?Z } }
}

There data is on the W3C site

On running this query we get:

org.mulgara.query.QueryException: Query failed
       at org.mulgara.resolver.DatabaseSession.execute(DatabaseSession.java:754)
       at org.mulgara.resolver.DatabaseSession.query(DatabaseSession.java:464)
       at org.openrdf.sail.mulgara.MulgaraTripleSource.evaluate(MulgaraTripleSource.java:111)
       at org.openrdf.sail.mulgara.MulgaraEvaluationStrategy.evaluate(MulgaraEvaluationStrategy.java:50)
       ... 27 more
Caused by: org.mulgara.query.MulgaraTransactionException: Transaction rollback triggered
       at org.mulgara.resolver.MulgaraInternalTransaction.implicitRollback(MulgaraInternalTransaction.java:516)
       at org.mulgara.resolver.MulgaraInternalTransaction.execute(MulgaraInternalTransaction.java:627)
       at org.mulgara.resolver.DatabaseSession.execute(DatabaseSession.java:751)
       ... 30 more
Caused by: org.mulgara.query.QueryException: Failed to resolve constraintExpression
       at org.mulgara.resolver.ConstraintOperations.resolveConstraintExpression(ConstraintOperations.java:197)
       at org.mulgara.resolver.LocalQueryResolver.resolveE(LocalQueryResolver.java:269)
       at org.mulgara.resolver.DatabaseOperationContext.doQuery(DatabaseOperationContext.java:786)
       at org.mulgara.resolver.QueryOperation.execute(QueryOperation.java:139)
       at org.mulgara.resolver.MulgaraInternalTransaction.execute(MulgaraInternalTransaction.java:623)
       ... 31 more
Caused by: org.mulgara.query.TuplesException: Bad [[LocalNode]] in constraint.  constraint.getElement(0) returned a [[LocalNode]] with value: 0 constraint=[gn0 gn1449 gn1481 gn1369]
       at org.mulgara.resolver.store.StatementStoreResolution.defineIndex(StatementStoreResolution.java:308)
       at org.mulgara.resolver.store.StatementStoreResolution.<init>(StatementStoreResolution.java:156)
       at org.mulgara.resolver.store.StatementStoreResolution.reresolve(StatementStoreResolution.java:371)
       at org.mulgara.store.tuples.TuplesOperations.resolveNewlyBoundFreeNames(TuplesOperations.java:563)
       at org.mulgara.store.tuples.TuplesOperations.unifyOperands(TuplesOperations.java:464)
       at org.mulgara.store.tuples.TuplesOperations.join(TuplesOperations.java:244)
       at org.mulgara.resolver.DefaultConstraintHandlers$5.resolve(DefaultConstraintHandlers.java:165)
       at org.mulgara.resolver.ConstraintOperations.resolveConstraintExpression(ConstraintOperations.java:187)
       ... 35 more

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