[GitHub] [tinkerpop] javeme commented on issue #1224: TINKERPOP-1733 Support g.E().properties().hasKey('xx') & hasValue('xx')

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javeme commented on issue #1224: TINKERPOP-1733 Support g.E().properties().hasKey('xx') & hasValue('xx')
URL: https://github.com/apache/tinkerpop/pull/1224#issuecomment-558643444
 
 
   > what's an example of the "same edges with two directions"?
   
   Such as there are two vertices: `person1` and `person2`, one edge with id "follow_1_2" linked from `person1` to `person2`, it can be expressed like this: `person1 -- follow -> person2`.
   When querying edges from source vertex `person1` by `g.V(person1).outE()`, got an edge:
     `person1 -- follow -> person2`,
   and querying edges from source vertex `person2` by `g.V(person2).inE()`, got an edge:
     `person2 <- follow -- person1`. 
   These two edges are essentially one edge, so it makes sense their comparison should be equal, but it's not equal for StarOutEdge and StarInEdge, no such issue for TinkerEdge.
   
   There seem to be 2 ways to fix OUT & IN StarEdge comparison:
   
   1. Override edge id of StarEdge, like [add StarEdgeId class](https://github.com/apache/tinkerpop/pull/1224/commits/8f604df919bdb9452068eb7ea41273e7aee5b2a7). (but there are still some problems: not registered kryo)
     ```c
   org.apache.tinkerpop.gremlin.driver.exception.ResponseException: Error during serialization: java.lang.IllegalArgumentException: Class is not registered: org.apache.tinkerpop.gremlin.structure.util.star.StarGraph$StarEdgeId
   Note: To register this class use: kryo.register(org.apache.tinkerpop.gremlin.structure.util.star.StarGraph$StarEdgeId.class);
   	at org.apache.tinkerpop.gremlin.server.GremlinResultSetIntegrateTest.shouldHandleTinkerGraphResult(GremlinResultSetIntegrateTest.java:207)
   Caused by: org.apache.tinkerpop.gremlin.driver.exception.ResponseException: 
   Error during serialization: java.lang.IllegalArgumentException: Class is not registered: org.apache.tinkerpop.gremlin.structure.util.star.StarGraph$StarEdgeId
   Note: To register this class use: kryo.register(org.apache.tinkerpop.gremlin.structure.util.star.StarGraph$StarEdgeId.class);
   ```
   2. Override StarEdge equals()
   
   Which way is better, or any other ideas?

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