暗号UNION查询

Question

我有简单如下图：
http://console.neo4j.org/?id=v0cvwn

而且我不知道为什么下面的查询：

START n=node(2) 
match n-[:KNOWS]-node 
return node.name as name 
UNION 
START n=node(2) 
match n-[:ACTS_IN]-node 
return node.name as name 

抛出异常：问题

java.lang.AssertionError: assertion failed: Can't profile the same pipe twice 
at scala.Predef$.assert(Predef.scala:179) 
at org.neo4j.cypher.internal.profiler.Profiler.decorate(Profiler.scala:47) 
at org.neo4j.cypher.internal.pipes.Pipe$class.createResults(Pipe.scala:35) 
at org.neo4j.cypher.internal.pipes.NullPipe$.createResults(Pipe.scala:47) 
at org.neo4j.cypher.internal.pipes.PipeWithSource.createResults(Pipe.scala:61) 
at org.neo4j.cypher.internal.pipes.PipeWithSource.createResults(Pipe.scala:61) 
at org.neo4j.cypher.internal.pipes.PipeWithSource.createResults(Pipe.scala:61) 
at org.neo4j.cypher.internal.pipes.UnionIterator.loadNextIterator$1(UnionIterator.scala:60) 
at org.neo4j.cypher.internal.pipes.UnionIterator.step$1(UnionIterator.scala:68) 
at org.neo4j.cypher.internal.pipes.UnionIterator.stepIfNeccessary(UnionIterato 

夫妇关于UNION：

是否有可能对UNION在以前的子查询中结果集中积累的所有数据执行另一个最终匹配子句？

是否可以通过该数据执行订单？

谢谢。

Answer 1

根据这些github评论，UNION只支持2.0或更高版本。

https://github.com/neo4j/neo4j/issues/125