[jira] [Created] (TINKERPOP-1088) Preserve Cardinality in Subgraph

["stephen mallette (JIRA)" <ji...@apache.org>]

stephen mallette created TINKERPOP-1088:
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             Summary: Preserve Cardinality in Subgraph
                 Key: TINKERPOP-1088
                 URL: https://issues.apache.org/jira/browse/TINKERPOP-1088
             Project: TinkerPop
          Issue Type: Bug
          Components: process
    Affects Versions: 3.1.0-incubating
            Reporter: stephen mallette


Originally reported here:

https://groups.google.com/d/msg/aureliusgraphs/qKvGZOWpNtY/ivd6qc_iAAAJ

{quote}
I found the cardinality of properties are not preserved in the subgraph 
generated by Gremlin 'Subgraph Step' (i.e. subgraph('sub').cap('sub')).

To be specific, in my case, I have several property keys with 'LIST' cardinality (e.g. propertyKey: created)
so that there can be multiple properties for those keys.
e.g.
gremlin> v.properties()
=>vp[created->true]
=>vp[created->false]
=>vp[created->true]

(properties also have nested properties so they are not just simple duplication of the same information)
 
However, when I generated subgraph from this graph,
only one of the properties using the same key is copied to the corresponding vertex in the subgraph.
{quote}

I think this can be fixed by explicitly using:

{code}
public <V> VertexProperty<V> property(final VertexProperty.Cardinality cardinality, final String key, final V value, final Object... keyValues);
{code}

Currently the cardinality check is occurring by default but against the target graph and not the source graph (so you get the wrong cardinality).





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