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Superhero network use case. Proposed PGQL for finding neighbors returns 0 results

Luis Rodriguez FernandezJun 16 2017 — edited Aug 20 2020

Hello there,

It looks like there is something wrong with the example query. It seems that the graph is built correctly:

pgx>  G = session.readGraphWithProperties("/home/lurodrig/development/workspaces/openlab/pgx/superhero-network/hero-network.csv.json").undirect()
==> PgxGraph[name=hero-network_sub-graph_1,N=6426,E=574467,created=1497625143428]
pgx> G.getNumEdges()
==> 574467
pgx> G.getNumVertices()
==> 6426

I can run the pageRank algorithm:

pgx> pageRank = analyst.pagerank(G, 0.0001, 0.85, 100)
==> VertexProperty[name=pagerank,type=double,graph=hero-network_sub-graph_1]
pgx> pageRank.getTopKValues(10)
==> PgxVertex[ID=CAPTAIN AMERICA]=0.0110658307488833
==> PgxVertex[ID=SPIDER-MAN/PETER PAR]=0.010883248192971052
==> PgxVertex[ID=IRON MAN/TONY STARK ]=0.00822400232340639
==> PgxVertex[ID=WOLVERINE/LOGAN ]=0.007184179121356004
==> PgxVertex[ID=THOR/DR. DONALD BLAK]=0.007111076442093899
==> PgxVertex[ID=THING/BENJAMIN J. GR]=0.007040224708813351
==> PgxVertex[ID=HUMAN TORCH/JOHNNY S]=0.006715685790441994
==> PgxVertex[ID=MR. FANTASTIC/REED R]=0.006474776413326844
==> PgxVertex[ID=SCARLET WITCH/WANDA ]=0.006292296186722285
==> PgxVertex[ID=INVISIBLE WOMAN/SUE ]=0.00607097561105347
[rest of output truncated]

I can do some basic pgql:

pgx> G.queryPgql("SELECT n.id(), n.pagerank WHERE (n) ORDER BY n.pagerank DESC").print(10)
+-----------------------------------------------+
| n.id()                 | n.pagerank           |
+-----------------------------------------------+
| "CAPTAIN AMERICA"      | 0.0110658307488833   |
| "SPIDER-MAN/PETER PAR" | 0.010883248192971052 |
| "IRON MAN/TONY STARK " | 0.00822400232340639  |
| "WOLVERINE/LOGAN "     | 0.007184179121356004 |
| "THOR/DR. DONALD BLAK" | 0.007111076442093899 |
| "THING/BENJAMIN J. GR" | 0.007040224708813351 |
| "HUMAN TORCH/JOHNNY S" | 0.006715685790441994 |
| "MR. FANTASTIC/REED R" | 0.006474776413326844 |
| "SCARLET WITCH/WANDA " | 0.006292296186722285 |
| "INVISIBLE WOMAN/SUE " | 0.00607097561105347  |
+-----------------------------------------------+
==> null

However when I ask for neighbors...

pgx> Results = G.queryPgql("SELECT x WHERE\
pgx>          (a @ 'SHANG-CHI')->(x),\
pgx>          (b @ 'WHITE TIGER/HECTOR A')->(x),\
pgx>          (c @ 'IRON FIST/DANIEL RAN')->(x)")
==> PgqlResultSetImpl[graph=hero-network_sub-graph_1,numResults=0]

... I do not get any result

And the characters are there, e.g:

pgx> G.queryPgql("SELECT n.id(), n.pagerank WHERE (n@'SHANG-CHI')").print()
+------------------------------------+
| n.id()      | n.pagerank           |
+------------------------------------+
| "SHANG-CHI" | 7.022436563813896E-4 |
+------------------------------------+
==> null

My environment looks like this:

Description:    Ubuntu 16.04.2 LTS

Java(TM) SE Runtime Environment (build 1.8.0_101-b13)

Java HotSpot(TM) 64-Bit Server VM

PGX Shell 2.4.1

Perhaps am I missing something?

Thanks in advance,

Luis
This post has been answered by oskarvanrest-Oracle on Jun 19 2017
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Added on Jun 16 2017
#database-key-features, #rdf-graph-property-graph
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