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https://issues.apache.org/jira/browse/TINKERPOP-2641?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17465006#comment-17465006
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Divij Vaidya commented on TINKERPOP-2641:
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Adding a note so that we don't forget. As part of completion of the ticket, we
need to update the orderability semantics at
https://tinkerpop.apache.org/docs/3.6.0-SNAPSHOT/dev/provider/#_composite_types_3
> Allow orderability on any type
> ------------------------------
>
> Key: TINKERPOP-2641
> URL: https://issues.apache.org/jira/browse/TINKERPOP-2641
> Project: TinkerPop
> Issue Type: Improvement
> Components: process
> Affects Versions: 3.5.1
> Reporter: Stephen Mallette
> Priority: Major
>
> Currently, TinkerPop follows comparability for orderability, thus
> non-comparable and mixed-type values will fail in ordering. The proposed
> change is to be able to order any types.
> {code}
> gremlin> g.V().order(). // 3.5.x
> org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerVertex cannot be
> cast to java.lang.Comparable
> Type ':help' or ':h' for help.
> Display stack trace? [yN]
> gremlin> g.V(1).values('name').union(identity(),V(2)).order() // 3.5.x
> org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerVertex cannot be
> cast to java.lang.Comparable
> Type ':help' or ':h' for help.
> Display stack trace? [yN]n
> gremlin> g.V().order() // proposed
> ==>v[1]
> ==>v[2]
> ==>v[3]
> ==>v[4]
> ==>v[5]
> ==>v[6]
> gremlin> g.V(1).values('name').union(identity(),V(2)).order() // proposed
> ==>v[2]
> ==>marko
> gremlin> g.addV().property("key", 100)
> ==>v[0]
> gremlin> g.addV().property("key", "100000")
> ==>v[2]
> gremlin> g.V().values('key').order() // 3.5.x
> java.lang.Integer cannot be cast to java.lang.String
> Type ':help' or ':h' for help.
> Display stack trace? [yN]
> gremlin> g.V().values('key').order() // proposed
> ==>100
> ==>100000
> {code}
> To sort across any types of values, we define the order between each type as
> follows:
> (In this order, ID, label, property key and property value are considered as
> a part of primitive types)
> * `nulltype`
> * Boolean
> * Number
> * Date
> * String
> * Vertex
> * Edge
> * VertexProperty
> * Property
> * Path
> * List
> * Map
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