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https://issues.apache.org/jira/browse/TINKERPOP-967?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16543630#comment-16543630
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ASF GitHub Bot commented on TINKERPOP-967:
------------------------------------------
Github user dkuppitz commented on a diff in the pull request:
https://github.com/apache/tinkerpop/pull/876#discussion_r202453831
--- Diff:
gremlin-core/src/test/java/org/apache/tinkerpop/gremlin/process/traversal/step/branch/RepeatStepTest.java
---
@@ -39,7 +39,9 @@
__.repeat(out()).times(3),
__.repeat(out().as("x")).times(3),
__.out().emit().repeat(out()).times(3),
- __.repeat(out()).until(hasLabel("x"))
+ __.repeat(out()).until(hasLabel("x")),
+ __.repeat("a", __.out()).times(3),
--- End diff --
Ah, alright, I totally missed the first entry, all good then.
We would have to shift or rotate the `loopName`'s hashCode value by the
depth of the repeat traversal. Unfortunately, we don't have this information
and I don't see how your `hashCode` implementation above would solve the
problem. Anyway, it's an unlikely corner case and I don't think we need to care
about it too much, so no big deal if we don't have a solution for now.
> Support nested-repeat() structures
> ----------------------------------
>
> Key: TINKERPOP-967
> URL: https://issues.apache.org/jira/browse/TINKERPOP-967
> Project: TinkerPop
> Issue Type: Improvement
> Components: process
> Affects Versions: 3.1.0-incubating
> Reporter: Marko A. Rodriguez
> Assignee: Marko A. Rodriguez
> Priority: Major
>
> All the internal plumbing is staged for this to happen, we just haven't gone
> all the way. In short, a {{NESTED_LOOP}} traverser has an internal
> {{loopStack}} where {{repeat(repeat())}} will have a {{loopStack}} of two.
> The {{it.loops()}} checks of the internal repeat will always check the top of
> the stack and when its done repeating will delete its counter off the top of
> the stack.
> [~dkuppitz]'s work on {{LoopStep}} will be backwards compatible. In
> {{RepeatStep}} we will support:
> {code}
> repeat('a',out('knows').repeat('b',out('parent')))
> {code}
> and thus, things like {{loops('a')}} as well as {{times('a',2)}}. Note that
> naming the loop stack will be a super rare case as most people will just
> assume standard nested looping semantics with a push/pop stack.
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