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java.lang.NullPointerException: 	at edu.washington.escience.myria.operator.LeapFrogJoin.generateSchema(LeapFrogJoin.java:625)	at edu.washington.escience.myria.operator.Operator.getSchema(Operator.java:497)	at edu.washington.escience.myria.operator.RootOperator.generateSchema(RootOperator.java:158)	at edu.washington.escience.myria.operator.Operator.getSchema(Operator.java:497)	at edu.washington.escience.myria.api.encoding.QueryConstruct.setConsumerSchema(QueryConstruct.java:604)	at edu.washington.escience.myria.api.encoding.QueryConstruct.instantiate(QueryConstruct.java:95)	at edu.washington.escience.myria.parallel.JsonSubQuery.instantiate(JsonSubQuery.java:70)	at edu.washington.escience.myria.parallel.Query.nextSubQuery(Query.java:208)	at edu.washington.escience.myria.parallel.QueryManager.advanceQuery(QueryManager.java:336)	at edu.washington.escience.myria.parallel.QueryManager.submitQuery(QueryManager.java:262)	at edu.washington.escience.myria.parallel.QueryManager.submitQuery(QueryManager.java:513)	at edu.washington.escience.myria.api.QueryResource.postNewQuery(QueryResource.java:92)	at sun.reflect.GeneratedMethodAccessor27.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory$1.invoke(ResourceMethodInvocationHandlerFactory.java:81)	at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher$1.run(AbstractJavaResourceMethodDispatcher.java:151)	at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:172)	at org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$ResponseOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:152)	at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:104)	at org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:384)	at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:342)	at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:101)	at org.glassfish.jersey.server.ServerRuntime$1.run(ServerRuntime.java:271)	at org.glassfish.jersey.internal.Errors$1.call(Errors.java:271)	at org.glassfish.jersey.internal.Errors$1.call(Errors.java:267)	at org.glassfish.jersey.internal.Errors.process(Errors.java:315)	at org.glassfish.jersey.internal.Errors.process(Errors.java:297)	at org.glassfish.jersey.internal.Errors.process(Errors.java:267)	at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:297)	at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:254)	at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:1030)	at org.glassfish.jersey.grizzly2.httpserver.GrizzlyHttpContainer.service(GrizzlyHttpContainer.java:378)	at org.glassfish.grizzly.http.server.HttpHandler$1.run(HttpHandler.java:219)	at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:565)	at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:545)