Daniel Kuppitz created TINKERPOP-1817:
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Summary: OLAP loses vertex labels
Key: TINKERPOP-1817
URL: https://issues.apache.org/jira/browse/TINKERPOP-1817
Project: TinkerPop
Issue Type: Bug
Components: process
Affects Versions: 3.2.6, 3.3.0
Reporter: Daniel Kuppitz
Working on this SO question:
https://stackoverflow.com/questions/46962237/how-to-perform-cross-join-on-different-vertices-in-gremlin-tinkerpop/46977603
...I noticed that the connected components query randomly loses the vertex
labels.
*Init Graph:*
{noformat}
graph = TinkerGraph.open()
g = graph.traversal()
a = graph.addVertex(label, "person", "user", "A")
b = graph.addVertex(label, "person", "user", "B")
c = graph.addVertex(label, "person", "user", "C")
d = graph.addVertex(label, "person", "user", "D")
one = graph.addVertex('rec_id')
one.property('ids', '1')
two = graph.addVertex('rec_id')
two.property('ids', '2')
three = graph.addVertex('rec_id')
three.property('ids', '3')
four = graph.addVertex('rec_id')
four.property('ids', '4')
five = graph.addVertex('rec_id')
five.property('ids', '5')
a.addEdge('part_of',one)
a.addEdge('part_of',two)
b.addEdge('part_of', three)
b.addEdge('part_of',four)
c.addEdge('part_of',five)
d.addEdge('part_of',four)
d.addEdge('part_of',two)
g = graph.traversal().withComputer()
{noformat}
*Query:*
{noformat}
g.V().
emit(cyclicPath().or().not(both())).
repeat(both()).
until(cyclicPath()).
aggregate("p").by(path()).cap("p").
unfold().limit(local, 1).dedup().
map(__.as("v").select("p").unfold().
filter(unfold().where(eq("v"))).
unfold().dedup().order().by(id).fold()).dedup().
project("Users","associated_ids").
by(unfold().label().fold()).
by(unfold().label().fold())
{noformat}
*Sample Output:*
{noformat}
gremlin> g.V().
......1> emit(cyclicPath().or().not(both())).
......2> repeat(both()).
......3> until(cyclicPath()).
......4> aggregate("p").by(path()).cap("p").
......5> unfold().limit(local, 1).dedup().
......6> map(__.as("v").select("p").unfold().
......7> filter(unfold().where(eq("v"))).
......8> unfold().dedup().order().by(id).fold()).dedup().
......9> project("Users","associated_ids").
.....10> by(unfold().label()./*hasLabel("person").*/fold()).
.....11> by(unfold().label()./*hasLabel("rec_id").*/fold())
==>[Users:[person,person,person,vertex,vertex,vertex,vertex],associated_ids:[person,person,person,vertex,vertex,vertex,vertex]]
==>[Users:[vertex,rec_id],associated_ids:[vertex,rec_id]]
gremlin> g = graph.traversal().withComputer()
==>graphtraversalsource[tinkergraph[vertices:9 edges:7], graphcomputer]
gremlin> g.V().
......1> emit(cyclicPath().or().not(both())).
......2> repeat(both()).
......3> until(cyclicPath()).
......4> aggregate("p").by(path()).cap("p").
......5> unfold().limit(local, 1).dedup().
......6> map(__.as("v").select("p").unfold().
......7> filter(unfold().where(eq("v"))).
......8> unfold().dedup().order().by(id).fold()).dedup().
......9> project("Users","associated_ids").
.....10> by(unfold().label()./*hasLabel("person").*/fold()).
.....11> by(unfold().label()./*hasLabel("rec_id").*/fold())
==>[Users:[person,person,person,rec_id,vertex,vertex,vertex],associated_ids:[person,person,person,rec_id,vertex,vertex,vertex]]
==>[Users:[vertex,rec_id],associated_ids:[vertex,rec_id]]
{noformat}
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