zhengyingying opened a new issue, #2198:
URL: https://github.com/apache/incubator-hugegraph/issues/2198

   ### Bug Type (问题类型)
   
   None
   
   ### Before submit
   
   - [X] 我已经确认现有的 [Issues](https://github.com/apache/hugegraph/issues) 与 
[FAQ](https://hugegraph.apache.org/docs/guides/faq/) 中没有相同 / 重复问题 (I have 
confirmed and searched that there are no similar problems in the historical 
issue and documents)
   
   ### Environment (环境信息)
   
   - Server Version: 1.0.0 (Apache Release Version)
   - Backend: RocksDB x nodes, HDD or SSD 
   - OS: xx CPUs, xx G RAM, Ubuntu 2x.x / CentOS 7.x 
   - Data Size:  xx vertices, xx edges <!-- (like 1000W 点, 9000W 边) -->
   
   
   ### Expected & Actual behavior (期望与实际表现)
   
   The following two queries have the same execution semantics, but they return 
inconsistent result.  I can also get the inconsistency when replacing 
`in().inE()`  to `out().outE()`.
   ```
   gremlin:> g.V().in().inE().order().by(desc) 
   org.apache.hugegraph.structure.HugeEdge cannot be cast to 
java.lang.Comparable
   
   gremlin:> 
g.withoutStrategies(GraphVertexStepStrategy).V().in().inE().order().by(desc)
   ```
   
   What's interesting is that if I replace `in().inE()` to `in().outE()` or 
replace `out().outE()` to `out().inE()`, I can get the consistent result.
   ```
   gremlin:> g.V().in().outE().order().by(desc) 
   org.apache.hugegraph.structure.HugeEdge cannot be cast to 
java.lang.Comparable
   
   gremlin:> 
g.withoutStrategies(GraphVertexStepStrategy).V().in().outE().order().by(desc) 
   org.apache.hugegraph.structure.HugeEdge cannot be cast to 
java.lang.Comparablee
   ```
   
   ### Vertex/Edge example (问题点 / 边数据举例)
   
   _No response_
   
   ### Schema [VertexLabel, EdgeLabel, IndexLabel] (元数据结构)
   
   _No response_


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