[jira] [Created] (TINKERPOP3-967) Support nested-repeat() structures.

["Marko A. Rodriguez (JIRA)" <ji...@apache.org>]

Marko A. Rodriguez created TINKERPOP3-967:
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             Summary: Support nested-repeat() structures.
                 Key: TINKERPOP3-967
                 URL: https://issues.apache.org/jira/browse/TINKERPOP3-967
             Project: TinkerPop 3
          Issue Type: Improvement
          Components: process
    Affects Versions: 3.1.0-incubating
            Reporter: Marko A. Rodriguez
            Assignee: Marko A. Rodriguez


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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