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https://issues.apache.org/jira/browse/TINKERPOP-2667?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17459418#comment-17459418
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ASF GitHub Bot commented on TINKERPOP-2667:
-------------------------------------------
spmallette opened a new pull request #1517:
URL: https://github.com/apache/tinkerpop/pull/1517
https://issues.apache.org/jira/browse/TINKERPOP-2667
The following works now:
```text
gremlin> g.inject([a: 1],[b:2]).fold([], addAll)
==>[[a:1],[b:2]]
gremlin> g.inject([a: 1],[b:2]).fold([:], addAll)
==>[a:1,b:2]
```
Interestingly, this functionality used to result in an exception so it
really isn't a change in behavior which means it could slip in on 3.5-dev.
VOTE +1
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> Allow fold() with addAll to work on Map
> ---------------------------------------
>
> Key: TINKERPOP-2667
> URL: https://issues.apache.org/jira/browse/TINKERPOP-2667
> Project: TinkerPop
> Issue Type: Improvement
> Components: process
> Affects Versions: 3.5.1
> Reporter: Stephen Mallette
> Assignee: Stephen Mallette
> Priority: Major
>
> The following bit of Gremlin should work as a method for merging {{Map}}:
> {code}
> gremlin> g.inject([a: 1],[b:2]).fold([:], addAll)
> ==>[a:1,b:2]
> {code}
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