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ASF GitHub Bot commented on TINKERPOP-3202:
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Cole-Greer commented on PR #3251:
URL: https://github.com/apache/tinkerpop/pull/3251#issuecomment-3438074599
VOTE +1
> Limit and range semantics change when used inside repeat
> --------------------------------------------------------
>
> Key: TINKERPOP-3202
> URL: https://issues.apache.org/jira/browse/TINKERPOP-3202
> Project: TinkerPop
> Issue Type: Improvement
> Components: process
> Affects Versions: 3.7.4
> Reporter: Andrea Child
> Priority: Major
> Labels: breaking
>
> Original dev list post:
> [https://lists.apache.org/thread/nclqpdb5d9wm6cgdxkk39k0co7gt564l]
> Currently, limit() and range() steps inside repeat() maintain global
> counters that persist across repeat iterations, leading to strange behaviour.
> To demonstrate, consider the following limit() traversals for the Grateful
> Dead toy graph which are querying for pairs of song sequences starting with
> the song 'JAM'.
> This repeat() traversal does not produce results because the limit(2)
> counter reaches the global limit after the first iteration (note that
> RepeatUnrollStrategy is disabled so that the repeat() step is not stripped
> by strategy optimization):
> gremlin>
> g.withoutStrategies(RepeatUnrollStrategy).V().has('name','JAM').repeat(out('followedBy').limit(2)).times(2).values('name’)
> gremlin>
> However, the following unrolled traversal without repeat() produces 2
> results:
> gremlin>
> g.V().has('name','JAM').out('followedBy').limit(2).out('followedBy').limit(2).propertyMap('name’)
> ==>[name:[vp[name->HURTS ME TOO]]]
> ==>[name:[vp[name->BLACK THROATED WIND]]]
> These examples demonstrate how having globally tracked limit() and range()
> counters inside repeat() are counter intuitive and instead should be tracked
> per-iteration.
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