In un database Neo4j con un paio di nodi e relazioni, sto cercando di individuare gli utenti più "popolari" (in questo caso: i nodi che partecipano alla maggior parte delle relazioni):Ordinare i nodi per numero di relazioni -> ThisShouldNotHappenError
START n=node:user('*:*')
MATCH (n)-[r]->(x)
RETURN n
ORDER BY COUNT(r) DESC
LIMIT 10
Tuttavia, questa query (Neo4j 1.9.2) provoca il seguente errore:
ThisShouldNotHappenError
Developer: Andres claims that: Aggregations should not be used like this.
StackTrace: org.neo4j.cypher.internal.commands.expressions.AggregationExpression.apply(AggregationExpression.scala:31) org.neo4j.cypher.internal.commands.expressions.AggregationExpression.apply(AggregationExpression.scala:29) org.neo4j.cypher.internal.pipes.ExtractPipe$$anonfun$internalCreateResults$1$$anonfun$apply$1.apply(ExtractPipe.scala:47) org.neo4j.cypher.internal.pipes.ExtractPipe$$anonfun$internalCreateResults$1$$anonfun$apply$1.apply(ExtractPipe.scala:45) scala.collection.immutable.Map$Map1.foreach(Map.scala:109) org.neo4j.cypher.internal.pipes.ExtractPipe$$anonfun$internalCreateResults$1.apply(ExtractPipe.scala:45) org.neo4j.cypher.internal.pipes.ExtractPipe$$anonfun$internalCreateResults$1.apply(ExtractPipe.scala:44) scala.collection.Iterator$$anon$11.next(Iterator.scala:328) org.neo4j.cypher.internal.pipes.TopPipe.internalCreateResults(TopPipe.scala:45) org.neo4j.cypher.internal.pipes.PipeWithSource.createResults(Pipe.scala:69) org.neo4j.cypher.internal.pipes.PipeWithSource.createResults(Pipe.scala:66) org.neo4j.cypher.internal.executionplan.ExecutionPlanImpl.org$neo4j$cypher$internal$executionplan$ExecutionPlanImpl$$prepareStateAndResult(ExecutionPlanImpl.scala:164) org.neo4j.cypher.internal.executionplan.ExecutionPlanImpl$$anonfun$getLazyReadonlyQuery$1.apply(ExecutionPlanImpl.scala:139) org.neo4j.cypher.internal.executionplan.ExecutionPlanImpl$$anonfun$getLazyReadonlyQuery$1.apply(ExecutionPlanImpl.scala:138) org.neo4j.cypher.internal.executionplan.ExecutionPlanImpl.execute(ExecutionPlanImpl.scala:38) org.neo4j.cypher.ExecutionEngine.execute(ExecutionEngine.scala:72) org.neo4j.cypher.ExecutionEngine.execute(ExecutionEngine.scala:76) org.neo4j.cypher.javacompat.ExecutionEngine.execute(ExecutionEngine.java:79) org.neo4j.server.rest.web.CypherService.cypher(CypherService.java:94) java.lang.reflect.Method.invoke(Method.java:611) org.neo4j.server.rest.security.SecurityFilter.doFilter(SecurityFilter.java:112)
Tutte le idee su come posso esprimere questo differntly?
+1 In realtà è sufficiente aggiungerlo al ritorno: 'return n, count (r) as c order by c', 'WITH' non è necessario. –