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https://issues.apache.org/jira/browse/TINKERPOP-2972?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ken Hu closed TINKERPOP-2972.
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Resolution: Done
> ProjectStep will produce an unexpected output when dealing with duplicate keys
> ------------------------------------------------------------------------------
>
> Key: TINKERPOP-2972
> URL: https://issues.apache.org/jira/browse/TINKERPOP-2972
> Project: TinkerPop
> Issue Type: Improvement
> Components: process
> Affects Versions: 3.6.4
> Reporter: Jianzhong Liu
> Priority: Major
> Fix For: 3.6.6, 3.7.1
>
>
> g.V().project("a", "b", "b").by("lang").by(T.id).by("age")
> TP:
> 1 \{'b': 29}
> 2 \{'b': 27}
> 3 \{'a': 'java', 'b': '3'}
> 4 \{'b': 32}
> 5 \{'a': 'java', 'b': '5'}
> 6 \{'b': 35}
> TinkerPop erroneously generates an output from the final 'productive'
> by-traversal when a key is used more than once, a situation that should not
> occur. A proposed solution is to throw an exception when a redundant key is
> detected.
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