[jira] [Closed] (TINKERPOP3-754) MergeStep

["Daniel Kuppitz (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/TINKERPOP3-754?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Daniel Kuppitz closed TINKERPOP3-754.
-------------------------------------
    Resolution: Unresolved

Haven't found a good use case so far. The only use case I've had can now be solved using {{select()}}. Will close for now.

> MergeStep
> ---------
>
>                 Key: TINKERPOP3-754
>                 URL: https://issues.apache.org/jira/browse/TINKERPOP3-754
>             Project: TinkerPop 3
>          Issue Type: Improvement
>          Components: process
>            Reporter: Daniel Kuppitz
>            Assignee: Marko A. Rodriguez
>
> Given the traversal in https://issues.apache.org/jira/browse/TINKERPOP3-753 I thought it would be nice to have a step that lets us modify a {{sideEffect}} map - basically {{store()}} for maps. For example:
> {code}
> g.V().match(
>       __.as("v").outE().count().as("outDegree"),
>       __.as("v").inE().count().as("inDegree")).
>    select("v").by(valueMap()).merge("outDegree","inDegree")
> {code}
> **Expected result:**
> {noformat}
> ==>[name=[marko], age=[29], inDegree=0, outDegree=3]
> ==>[name=[vadas], age=[27], inDegree=1, outDegree=0]
> ==>[name=[lop], lang=[java], inDegree=3, outDegree=0]
> ==>[name=[josh], age=[32], inDegree=1, outDegree=2]
> ==>[name=[ripple], lang=[java], inDegree=1, outDegree=0]
> ==>[name=[peter], age=[35], inDegree=0, outDegree=1]
> {noformat}
> Instead of {{.merge(keys...)}} we could also make it {{.merge(mapKey, keys...)}} (which is probably better as it allows more flexible traversals).
> [~okram] already mentioned that {{merge()}} might not be the best name (and I agree), so both - the name and the functionality - are still open for discussions.



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