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https://issues.apache.org/jira/browse/TINKERPOP-2220?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16842565#comment-16842565
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Daniel Kuppitz commented on TINKERPOP-2220:
-------------------------------------------
Just had another idea on how to explain it. Instead of {{dedup()}} let's just
use a filter lambda that follows the same rules (and prints some debug
messages):
{code}
gremlin> dedupLambda = {
......1> element = it.get()
......2> step = it.getStepId()
......3> if ((m = (step =~ /[0-9]+\.[0-9]+\.[0-9]+\(\)/)).find()) {
......4> step = m.group()
......5> }
......6> seen = memory[step]?.contains(element)
......7> memory[step] = (memory[step] ?: []) + [element]
......8> println "${element} seen at step ${step}: ${seen ? 'yes (filter it)'
: 'no (let it pass)'}"
......9> return !seen
.....10> }
==>groovysh_evaluate$_run_closure1@67514bdd
gremlin>
gremlin> memory = [:] ; g.V().filter(dedupLambda).filter(dedupLambda).count()
v[1] seen at step 1.0.0(): no (let it pass)
v[1] seen at step 2.0.0(): no (let it pass)
v[2] seen at step 1.0.0(): no (let it pass)
v[2] seen at step 2.0.0(): no (let it pass)
v[3] seen at step 1.0.0(): no (let it pass)
v[3] seen at step 2.0.0(): no (let it pass)
v[4] seen at step 1.0.0(): no (let it pass)
v[4] seen at step 2.0.0(): no (let it pass)
v[5] seen at step 1.0.0(): no (let it pass)
v[5] seen at step 2.0.0(): no (let it pass)
v[6] seen at step 1.0.0(): no (let it pass)
v[6] seen at step 2.0.0(): no (let it pass)
==>6
gremlin> memory = [:] ; g.V().repeat(filter(dedupLambda)).times(2).count()
v[1] seen at step 1.0.0(): no (let it pass)
v[1] seen at step 1.0.0(): yes (filter it)
v[2] seen at step 1.0.0(): no (let it pass)
v[2] seen at step 1.0.0(): yes (filter it)
v[3] seen at step 1.0.0(): no (let it pass)
v[3] seen at step 1.0.0(): yes (filter it)
v[4] seen at step 1.0.0(): no (let it pass)
v[4] seen at step 1.0.0(): yes (filter it)
v[5] seen at step 1.0.0(): no (let it pass)
v[5] seen at step 1.0.0(): yes (filter it)
v[6] seen at step 1.0.0(): no (let it pass)
v[6] seen at step 1.0.0(): yes (filter it)
==>0
{code}
> Dedup inside Repeat Produces 0 results
> --------------------------------------
>
> Key: TINKERPOP-2220
> URL: https://issues.apache.org/jira/browse/TINKERPOP-2220
> Project: TinkerPop
> Issue Type: Bug
> Components: process
> Affects Versions: 3.3.0
> Reporter: Rahul Chander
> Priority: Major
>
> Testing against the Tinkerpop Modern graph dataset, I ran this query:
> {code:java}
> g.V().repeat(__.dedup()).times(2).count()
> {code}
> which should essentially be the same as running dedup twice. It produced 0
> results, while dedup twice produced the correct 6.
>
>
>
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