Stardog Service Queries

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s.ar...@geophy.com

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Jan 4, 2017, 5:54:14 AM1/4/17
to Stardog
Why this query does not work on stardog?

SELECT ?s ?o
 
WHERE
{ 
  
   ?s  <http://geophy.com/latitude> ?lat  .  
    SERVICE <http://localhost:3000/queries> { 
    ?s ?e ?o . filter (?o  = ?lat)
    } 
                    
}

ERROR 2017-01-04 11:49:27,051 [StardogServer.WorkerGroup-4] com.complexible.stardog.protocols.http.server.HttpMessageEncoder:write(161): There was an error while encoding the response
com.complexible.common.protocols.EncodingException: com.complexible.stardog.plan.eval.operator.OperatorException: 0
at com.complexible.stardog.protocols.http.server.io.ResponseBodyEncoders$13.encode(ResponseBodyEncoders.java:473) ~[stardog-protocols-http-server-4.2.1.jar:?]
at com.complexible.stardog.protocols.http.server.io.ResponseBodyEncoders$2.encode(ResponseBodyEncoders.java:101) ~[stardog-protocols-http-server-4.2.1.jar:?]
at com.complexible.stardog.protocols.http.annex.QueryPanelEncoder.encode(QueryPanelEncoder.java:112) ~[stardog-webconsole-annex-4.2.1.jar:?]
at com.complexible.stardog.protocols.http.server.HttpMessageEncoder.write(HttpMessageEncoder.java:158) [stardog-protocols-http-server-4.2.1.jar:?]
at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:633) [netty-all-4.0.32.Final.jar:4.0.32.Final]
at io.netty.channel.AbstractChannelHandlerContext.access$1900(AbstractChannelHandlerContext.java:32) [netty-all-4.0.32.Final.jar:4.0.32.Final]
at io.netty.channel.AbstractChannelHandlerContext$AbstractWriteTask.write(AbstractChannelHandlerContext.java:908) [netty-all-4.0.32.Final.jar:4.0.32.Final]
at io.netty.channel.AbstractChannelHandlerContext$AbstractWriteTask.run(AbstractChannelHandlerContext.java:893) [netty-all-4.0.32.Final.jar:4.0.32.Final]
at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:358) [netty-all-4.0.32.Final.jar:4.0.32.Final]
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:357) [netty-all-4.0.32.Final.jar:4.0.32.Final]
at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:112) [netty-all-4.0.32.Final.jar:4.0.32.Final]
at java.lang.Thread.run(Thread.java:745) [?:1.8.0_111]
Caused by: org.openrdf.query.QueryEvaluationException: com.complexible.stardog.plan.eval.operator.OperatorException: 0
at com.complexible.common.rdf.query.IteratorAsTupleQueryResult.hasNext(IteratorAsTupleQueryResult.java:81) ~[stardog-utils-rdf-4.2.1.jar:?]
at com.complexible.stardog.protocols.server.ConnectionFinishQueryResult.hasNext(ConnectionFinishQueryResult.java:75) ~[stardog-protocols-spec-server-4.2.1.jar:?]
at org.openrdf.query.QueryResults.report(QueryResults.java:158) ~[sesame-query-4.0.0.jar:?]
at org.openrdf.query.resultio.QueryResultIO.writeTuple(QueryResultIO.java:449) ~[sesame-queryresultio-api-4.0.0.jar:?]
at com.complexible.stardog.protocols.http.server.io.ResponseBodyEncoders$13.encode(ResponseBodyEncoders.java:470) ~[stardog-protocols-http-server-4.2.1.jar:?]
... 11 more
Caused by: com.complexible.stardog.plan.eval.operator.OperatorException: 0
at com.complexible.stardog.plan.eval.operator.impl.ServiceOperatorImpl.computeNext(ServiceOperatorImpl.java:139) ~[stardog-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.operator.impl.ServiceOperatorImpl.computeNext(ServiceOperatorImpl.java:37) ~[stardog-4.2.1.jar:?]
at com.complexible.common.collect.AbstractSkippingIterator.tryToComputeNext(AbstractSkippingIterator.java:143) ~[stardog-utils-common-4.2.1.jar:?]
at com.complexible.common.collect.AbstractSkippingIterator.hasNext(AbstractSkippingIterator.java:130) ~[stardog-utils-common-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.operator.impl.LoopJoin.nextLeft(LoopJoin.java:143) ~[stardog-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.operator.impl.LoopJoin.computeNext(LoopJoin.java:176) ~[stardog-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.operator.impl.LoopJoin.computeNext(LoopJoin.java:25) ~[stardog-4.2.1.jar:?]
at com.complexible.common.collect.AbstractSkippingIterator.tryToComputeNext(AbstractSkippingIterator.java:143) ~[stardog-utils-common-4.2.1.jar:?]
at com.complexible.common.collect.AbstractSkippingIterator.hasNext(AbstractSkippingIterator.java:130) ~[stardog-utils-common-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.operator.impl.SingleProjectionOp.computeNext(SingleProjectionOp.java:83) ~[stardog-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.operator.impl.SingleProjectionOp.computeNext(SingleProjectionOp.java:33) ~[stardog-4.2.1.jar:?]
at com.complexible.common.collect.AbstractSkippingIterator.tryToComputeNext(AbstractSkippingIterator.java:143) ~[stardog-utils-common-4.2.1.jar:?]
at com.complexible.common.collect.AbstractSkippingIterator.hasNext(AbstractSkippingIterator.java:130) ~[stardog-utils-common-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.operator.impl.SliceOp._hasNext(SliceOp.java:87) ~[stardog-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.operator.impl.SliceOp.computeNext(SliceOp.java:95) ~[stardog-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.operator.impl.SliceOp.computeNext(SliceOp.java:26) ~[stardog-4.2.1.jar:?]
at com.complexible.common.collect.AbstractSkippingIterator.tryToComputeNext(AbstractSkippingIterator.java:143) ~[stardog-utils-common-4.2.1.jar:?]
at com.complexible.common.collect.AbstractSkippingIterator.hasNext(AbstractSkippingIterator.java:130) ~[stardog-utils-common-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.operator.util.AutoCloseOperator.computeNext(AutoCloseOperator.java:115) ~[stardog-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.operator.util.AutoCloseOperator.computeNext(AutoCloseOperator.java:25) ~[stardog-4.2.1.jar:?]
at com.complexible.common.collect.AbstractSkippingIterator.tryToComputeNext(AbstractSkippingIterator.java:143) ~[stardog-utils-common-4.2.1.jar:?]
at com.complexible.common.collect.AbstractSkippingIterator.hasNext(AbstractSkippingIterator.java:130) ~[stardog-utils-common-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.operator.util.OpBasedBindingSetIteration.computeNext(OpBasedBindingSetIteration.java:110) ~[stardog-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.operator.util.OpBasedBindingSetIteration.computeNext(OpBasedBindingSetIteration.java:34) ~[stardog-4.2.1.jar:?]
at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:143) ~[guava-18.0.jar:?]
at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:138) ~[guava-18.0.jar:?]
at com.complexible.common.rdf.query.IteratorAsTupleQueryResult.hasNext(IteratorAsTupleQueryResult.java:77) ~[stardog-utils-rdf-4.2.1.jar:?]
at com.complexible.stardog.protocols.server.ConnectionFinishQueryResult.hasNext(ConnectionFinishQueryResult.java:75) ~[stardog-protocols-spec-server-4.2.1.jar:?]
at org.openrdf.query.QueryResults.report(QueryResults.java:158) ~[sesame-query-4.0.0.jar:?]
at org.openrdf.query.resultio.QueryResultIO.writeTuple(QueryResultIO.java:449) ~[sesame-queryresultio-api-4.0.0.jar:?]
at com.complexible.stardog.protocols.http.server.io.ResponseBodyEncoders$13.encode(ResponseBodyEncoders.java:470) ~[stardog-protocols-http-server-4.2.1.jar:?]
... 11 more
Caused by: java.lang.ArrayIndexOutOfBoundsException: 0
at com.complexible.stardog.plan.eval.operator.impl.LeanSolutionImpl.set(LeanSolutionImpl.java:70) ~[stardog-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.service.ResultsToSolutionIterator.computeNext(ResultsToSolutionIterator.java:76) ~[stardog-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.service.ResultsToSolutionIterator.computeNext(ResultsToSolutionIterator.java:31) ~[stardog-4.2.1.jar:?]
at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:143) ~[guava-18.0.jar:?]
at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:138) ~[guava-18.0.jar:?]
at com.complexible.stardog.plan.eval.operator.impl.ServiceOperatorImpl.computeNext(ServiceOperatorImpl.java:126) ~[stardog-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.operator.impl.ServiceOperatorImpl.computeNext(ServiceOperatorImpl.java:37) ~[stardog-4.2.1.jar:?]
at com.complexible.common.collect.AbstractSkippingIterator.tryToComputeNext(AbstractSkippingIterator.java:143) ~[stardog-utils-common-4.2.1.jar:?]
at com.complexible.common.collect.AbstractSkippingIterator.hasNext(AbstractSkippingIterator.java:130) ~[stardog-utils-common-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.operator.impl.LoopJoin.nextLeft(LoopJoin.java:143) ~[stardog-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.operator.impl.LoopJoin.computeNext(LoopJoin.java:176) ~[stardog-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.operator.impl.LoopJoin.computeNext(LoopJoin.java:25) ~[stardog-4.2.1.jar:?]
at com.complexible.common.collect.AbstractSkippingIterator.tryToComputeNext(AbstractSkippingIterator.java:143) ~[stardog-utils-common-4.2.1.jar:?]
at com.complexible.common.collect.AbstractSkippingIterator.hasNext(AbstractSkippingIterator.java:130) ~[stardog-utils-common-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.operator.impl.SingleProjectionOp.computeNext(SingleProjectionOp.java:83) ~[stardog-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.operator.impl.SingleProjectionOp.computeNext(SingleProjectionOp.java:33) ~[stardog-4.2.1.jar:?]
at com.complexible.common.collect.AbstractSkippingIterator.tryToComputeNext(AbstractSkippingIterator.java:143) ~[stardog-utils-common-4.2.1.jar:?]
at com.complexible.common.collect.AbstractSkippingIterator.hasNext(AbstractSkippingIterator.java:130) ~[stardog-utils-common-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.operator.impl.SliceOp._hasNext(SliceOp.java:87) ~[stardog-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.operator.impl.SliceOp.computeNext(SliceOp.java:95) ~[stardog-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.operator.impl.SliceOp.computeNext(SliceOp.java:26) ~[stardog-4.2.1.jar:?]
at com.complexible.common.collect.AbstractSkippingIterator.tryToComputeNext(AbstractSkippingIterator.java:143) ~[stardog-utils-common-4.2.1.jar:?]
at com.complexible.common.collect.AbstractSkippingIterator.hasNext(AbstractSkippingIterator.java:130) ~[stardog-utils-common-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.operator.util.AutoCloseOperator.computeNext(AutoCloseOperator.java:115) ~[stardog-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.operator.util.AutoCloseOperator.computeNext(AutoCloseOperator.java:25) ~[stardog-4.2.1.jar:?]
at com.complexible.common.collect.AbstractSkippingIterator.tryToComputeNext(AbstractSkippingIterator.java:143) ~[stardog-utils-common-4.2.1.jar:?]
at com.complexible.common.collect.AbstractSkippingIterator.hasNext(AbstractSkippingIterator.java:130) ~[stardog-utils-common-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.operator.util.OpBasedBindingSetIteration.computeNext(OpBasedBindingSetIteration.java:110) ~[stardog-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.operator.util.OpBasedBindingSetIteration.computeNext(OpBasedBindingSetIteration.java:34) ~[stardog-4.2.1.jar:?]
at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:143) ~[guava-18.0.jar:?]
at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:138) ~[guava-18.0.jar:?]
at com.complexible.common.rdf.query.IteratorAsTupleQueryResult.hasNext(IteratorAsTupleQueryResult.java:77) ~[stardog-utils-rdf-4.2.1.jar:?]
at com.complexible.stardog.protocols.server.ConnectionFinishQueryResult.hasNext(ConnectionFinishQueryResult.java:75) ~[stardog-protocols-spec-server-4.2.1.jar:?]
at org.openrdf.query.QueryResults.report(QueryResults.java:158) ~[sesame-query-4.0.0.jar:?]
at org.openrdf.query.resultio.QueryResultIO.writeTuple(QueryResultIO.java:449) ~[sesame-queryresultio-api-4.0.0.jar:?]
at com.complexible.stardog.protocols.http.server.io.ResponseBodyEncoders$13.encode(ResponseBodyEncoders.java:470) ~[stardog-protocols-http-server-4.2.1.jar:?]
... 11 more
ERROR 2017-01-04 11:49:27,053 [StardogServer.WorkerGroup-4] com.complexible.stardog.protocols.http.server.HttpMessageEncoder:write(171): There was an error writing the HTTP response
org.openrdf.query.QueryEvaluationException: com.complexible.stardog.plan.eval.operator.OperatorException: 0
at com.complexible.common.rdf.query.IteratorAsTupleQueryResult.hasNext(IteratorAsTupleQueryResult.java:81) ~[stardog-utils-rdf-4.2.1.jar:?]
at com.complexible.stardog.protocols.server.ConnectionFinishQueryResult.hasNext(ConnectionFinishQueryResult.java:75) ~[stardog-protocols-spec-server-4.2.1.jar:?]
at org.openrdf.query.QueryResults.report(QueryResults.java:158) ~[sesame-query-4.0.0.jar:?]
at org.openrdf.query.resultio.QueryResultIO.writeTuple(QueryResultIO.java:449) ~[sesame-queryresultio-api-4.0.0.jar:?]
at com.complexible.stardog.protocols.http.server.io.ResponseBodyEncoders$13.encode(ResponseBodyEncoders.java:470) ~[stardog-protocols-http-server-4.2.1.jar:?]
at com.complexible.stardog.protocols.http.server.io.ResponseBodyEncoders$2.encode(ResponseBodyEncoders.java:101) ~[stardog-protocols-http-server-4.2.1.jar:?]
at com.complexible.stardog.protocols.http.annex.QueryPanelEncoder.encode(QueryPanelEncoder.java:112) ~[stardog-webconsole-annex-4.2.1.jar:?]
at com.complexible.stardog.protocols.http.server.HttpMessageEncoder.write(HttpMessageEncoder.java:158) [stardog-protocols-http-server-4.2.1.jar:?]
at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:633) [netty-all-4.0.32.Final.jar:4.0.32.Final]
at io.netty.channel.AbstractChannelHandlerContext.access$1900(AbstractChannelHandlerContext.java:32) [netty-all-4.0.32.Final.jar:4.0.32.Final]
at io.netty.channel.AbstractChannelHandlerContext$AbstractWriteTask.write(AbstractChannelHandlerContext.java:908) [netty-all-4.0.32.Final.jar:4.0.32.Final]
at io.netty.channel.AbstractChannelHandlerContext$AbstractWriteTask.run(AbstractChannelHandlerContext.java:893) [netty-all-4.0.32.Final.jar:4.0.32.Final]
at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:358) [netty-all-4.0.32.Final.jar:4.0.32.Final]
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:357) [netty-all-4.0.32.Final.jar:4.0.32.Final]
at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:112) [netty-all-4.0.32.Final.jar:4.0.32.Final]
at java.lang.Thread.run(Thread.java:745) [?:1.8.0_111]
Caused by: com.complexible.stardog.plan.eval.operator.OperatorException: 0
at com.complexible.stardog.plan.eval.operator.impl.ServiceOperatorImpl.computeNext(ServiceOperatorImpl.java:139) ~[stardog-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.operator.impl.ServiceOperatorImpl.computeNext(ServiceOperatorImpl.java:37) ~[stardog-4.2.1.jar:?]
at com.complexible.common.collect.AbstractSkippingIterator.tryToComputeNext(AbstractSkippingIterator.java:143) ~[stardog-utils-common-4.2.1.jar:?]
at com.complexible.common.collect.AbstractSkippingIterator.hasNext(AbstractSkippingIterator.java:130) ~[stardog-utils-common-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.operator.impl.LoopJoin.nextLeft(LoopJoin.java:143) ~[stardog-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.operator.impl.LoopJoin.computeNext(LoopJoin.java:176) ~[stardog-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.operator.impl.LoopJoin.computeNext(LoopJoin.java:25) ~[stardog-4.2.1.jar:?]
at com.complexible.common.collect.AbstractSkippingIterator.tryToComputeNext(AbstractSkippingIterator.java:143) ~[stardog-utils-common-4.2.1.jar:?]
at com.complexible.common.collect.AbstractSkippingIterator.hasNext(AbstractSkippingIterator.java:130) ~[stardog-utils-common-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.operator.impl.SingleProjectionOp.computeNext(SingleProjectionOp.java:83) ~[stardog-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.operator.impl.SingleProjectionOp.computeNext(SingleProjectionOp.java:33) ~[stardog-4.2.1.jar:?]
at com.complexible.common.collect.AbstractSkippingIterator.tryToComputeNext(AbstractSkippingIterator.java:143) ~[stardog-utils-common-4.2.1.jar:?]
at com.complexible.common.collect.AbstractSkippingIterator.hasNext(AbstractSkippingIterator.java:130) ~[stardog-utils-common-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.operator.impl.SliceOp._hasNext(SliceOp.java:87) ~[stardog-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.operator.impl.SliceOp.computeNext(SliceOp.java:95) ~[stardog-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.operator.impl.SliceOp.computeNext(SliceOp.java:26) ~[stardog-4.2.1.jar:?]
at com.complexible.common.collect.AbstractSkippingIterator.tryToComputeNext(AbstractSkippingIterator.java:143) ~[stardog-utils-common-4.2.1.jar:?]
at com.complexible.common.collect.AbstractSkippingIterator.hasNext(AbstractSkippingIterator.java:130) ~[stardog-utils-common-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.operator.util.AutoCloseOperator.computeNext(AutoCloseOperator.java:115) ~[stardog-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.operator.util.AutoCloseOperator.computeNext(AutoCloseOperator.java:25) ~[stardog-4.2.1.jar:?]
at com.complexible.common.collect.AbstractSkippingIterator.tryToComputeNext(AbstractSkippingIterator.java:143) ~[stardog-utils-common-4.2.1.jar:?]
at com.complexible.common.collect.AbstractSkippingIterator.hasNext(AbstractSkippingIterator.java:130) ~[stardog-utils-common-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.operator.util.OpBasedBindingSetIteration.computeNext(OpBasedBindingSetIteration.java:110) ~[stardog-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.operator.util.OpBasedBindingSetIteration.computeNext(OpBasedBindingSetIteration.java:34) ~[stardog-4.2.1.jar:?]
at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:143) ~[guava-18.0.jar:?]
at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:138) ~[guava-18.0.jar:?]
at com.complexible.common.rdf.query.IteratorAsTupleQueryResult.hasNext(IteratorAsTupleQueryResult.java:77) ~[stardog-utils-rdf-4.2.1.jar:?]
... 15 more
Caused by: java.lang.ArrayIndexOutOfBoundsException: 0
at com.complexible.stardog.plan.eval.operator.impl.LeanSolutionImpl.set(LeanSolutionImpl.java:70) ~[stardog-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.service.ResultsToSolutionIterator.computeNext(ResultsToSolutionIterator.java:76) ~[stardog-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.service.ResultsToSolutionIterator.computeNext(ResultsToSolutionIterator.java:31) ~[stardog-4.2.1.jar:?]
at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:143) ~[guava-18.0.jar:?]
at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:138) ~[guava-18.0.jar:?]
at com.complexible.stardog.plan.eval.operator.impl.ServiceOperatorImpl.computeNext(ServiceOperatorImpl.java:126) ~[stardog-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.operator.impl.ServiceOperatorImpl.computeNext(ServiceOperatorImpl.java:37) ~[stardog-4.2.1.jar:?]
at com.complexible.common.collect.AbstractSkippingIterator.tryToComputeNext(AbstractSkippingIterator.java:143) ~[stardog-utils-common-4.2.1.jar:?]
at com.complexible.common.collect.AbstractSkippingIterator.hasNext(AbstractSkippingIterator.java:130) ~[stardog-utils-common-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.operator.impl.LoopJoin.nextLeft(LoopJoin.java:143) ~[stardog-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.operator.impl.LoopJoin.computeNext(LoopJoin.java:176) ~[stardog-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.operator.impl.LoopJoin.computeNext(LoopJoin.java:25) ~[stardog-4.2.1.jar:?]
at com.complexible.common.collect.AbstractSkippingIterator.tryToComputeNext(AbstractSkippingIterator.java:143) ~[stardog-utils-common-4.2.1.jar:?]
at com.complexible.common.collect.AbstractSkippingIterator.hasNext(AbstractSkippingIterator.java:130) ~[stardog-utils-common-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.operator.impl.SingleProjectionOp.computeNext(SingleProjectionOp.java:83) ~[stardog-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.operator.impl.SingleProjectionOp.computeNext(SingleProjectionOp.java:33) ~[stardog-4.2.1.jar:?]
at com.complexible.common.collect.AbstractSkippingIterator.tryToComputeNext(AbstractSkippingIterator.java:143) ~[stardog-utils-common-4.2.1.jar:?]
at com.complexible.common.collect.AbstractSkippingIterator.hasNext(AbstractSkippingIterator.java:130) ~[stardog-utils-common-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.operator.impl.SliceOp._hasNext(SliceOp.java:87) ~[stardog-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.operator.impl.SliceOp.computeNext(SliceOp.java:95) ~[stardog-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.operator.impl.SliceOp.computeNext(SliceOp.java:26) ~[stardog-4.2.1.jar:?]
at com.complexible.common.collect.AbstractSkippingIterator.tryToComputeNext(AbstractSkippingIterator.java:143) ~[stardog-utils-common-4.2.1.jar:?]
at com.complexible.common.collect.AbstractSkippingIterator.hasNext(AbstractSkippingIterator.java:130) ~[stardog-utils-common-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.operator.util.AutoCloseOperator.computeNext(AutoCloseOperator.java:115) ~[stardog-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.operator.util.AutoCloseOperator.computeNext(AutoCloseOperator.java:25) ~[stardog-4.2.1.jar:?]
at com.complexible.common.collect.AbstractSkippingIterator.tryToComputeNext(AbstractSkippingIterator.java:143) ~[stardog-utils-common-4.2.1.jar:?]
at com.complexible.common.collect.AbstractSkippingIterator.hasNext(AbstractSkippingIterator.java:130) ~[stardog-utils-common-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.operator.util.OpBasedBindingSetIteration.computeNext(OpBasedBindingSetIteration.java:110) ~[stardog-4.2.1.jar:?]
at com.complexible.stardog.plan.eval.operator.util.OpBasedBindingSetIteration.computeNext(OpBasedBindingSetIteration.java:34) ~[stardog-4.2.1.jar:?]
at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:143) ~[guava-18.0.jar:?]
at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:138) ~[guava-18.0.jar:?]
at com.complexible.common.rdf.query.IteratorAsTupleQueryResult.hasNext(IteratorAsTupleQueryResult.java:77) ~[stardog-utils-rdf-4.2.1.jar:?]
... 15 more

Zachary Whitley

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Jan 4, 2017, 6:55:07 AM1/4/17
to sta...@clarkparsia.com
I believe the problem might be with the filter in the service query. Specifically the ?lat variable. The service query will be executed first without any bindings so your remote till try to answer 

?s ?e ?o . filter (?o  = ?lat)

And fail because ?lat doesn't have any bindings. Granted without that the remote query will not be selective and depending on how much data you have will not perform very well. The easiest solution is to import the data from your remote into Stardog. 
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Samur Araujo

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Jan 4, 2017, 9:55:44 AM1/4/17
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I would expect the query planner to expand the service query with the values for ?lat.

Is that ever an implementation that is going to exist?


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Stephen Nowell

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Jan 4, 2017, 10:04:19 AM1/4/17
to sta...@clarkparsia.com
Samur,

If the remote values were loaded into Stardog, then performing that join would be trivial. What you suggest, however, would require a separate call to the SERVICE for every possible value of ?lat. There are many reasons why we would not want to allow that, but at the very least performance would be substantially slower and limited by your network speeds.

Cheers,
Stephen

Zachary Whitley

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Jan 4, 2017, 10:18:51 AM1/4/17
to Stardog
Depending on the carnality you could try flipping it around with the following

SELECT
    ?s ?o
WHERE
{ 
    SERVICE <http://localhost:3000/queries> { 
        ?s ?e ?lat .
        SERVICE <http://wherever-stardog-is> {

            ?s  <http://geophy.com/latitude> ?lat  .
        }
    }
}

You could also try using a query federation engine that specifically addresses this optimization. FedX [1], SPLENDID [2], and SemaGrow [3] seem to be the three top contenders in this category with SemaGrow being the most recent and self described leader in this category.

[1] http://www.fluidops.com/en/company/training/open_source
[2] https://github.com/goerlitz/rdffederator
[3] http://semagrow.github.io/




On Wed, Jan 4, 2017 at 10:04 AM, Stephen Nowell <ste...@stardog.com> wrote:
Samur,

If the remote values were loaded into Stardog, then performing that join would be trivial. What you suggest, however, would require a separate call to the SERVICE for every possible value of ?lat. There are many reasons why we would not want to allow that, but at the very least performance would be substantially slower and limited by your network speeds.

Cheers,
Stephen


On 1/4/17 09:55, Samur Araujo wrote:
I would expect the query planner to expand the service query with the values for ?lat.

Is that ever an implementation that is going to exist?
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