![MATCH (p:Planet)-[orbit:ORBITS]->(:Star {name: 'Sun'})
WHERE orbit.au < 5
RETURN p AS planet;
g.V().as('p').outE('ORBITS').as('orbit').inV().as(' UNNAMED34')
.where(and(
select('p').hasLabel('Planet'),
select(' UNNAMED34').values('name').is(eq('Sun')),
select(' UNNAMED34').hasLabel('Star'),
select('orbit').values('au').is(lt(5))
))
.select('p').map(project('planet').by(identity()))
The gist](https://image.slidesharecdn.com/cypherforgremlin-ocig7-180315115238/85/Cypher-for-Gremlin-5-320.jpg)
![Clauses Other Patterns Functions
MATCH
RETURN
UNWIND
OPTIONAL MATCH
WITH
UNION
CREATE
MERGE
SET
DETACH DELETE
ON CREATE
ON MATCH
WHERE
ORDER BY
SKIP
LIMIT
DISTINCT
(n:L {k: ‘v’})
()-->()
()--()
()-[r:L {k: ‘v’}]-()
(n)-[r]-(m)
()-[]-()-[]-()
()-[*n]-()
[x IN … | …]
avg, collect, count,
max, min, sum
keys, labels, nodes,
relationships, size
type, exists,
type conversion,
string matching
It is not guaranteed, however, that all combinations of
the listed clauses, patterns, or functions will work.
You are welcome to report any issues with the
translation that you encounter.
Cypher → Gremlin translation](https://image.slidesharecdn.com/cypherforgremlin-ocig7-180315115238/85/Cypher-for-Gremlin-6-320.jpg)
Cypher for Gremlin
- 2. Apache TinkerPop Apache TinkerPop™ is a graph computing framework for both graph databases (OLTP) and graph analytic systems (OLAP). Gremlin is a graph traversal language developed by Apache TinkerPop.
- 3. Gremlin in the wild
- 4. Gremlin language gremlin> g.V().count() ==>0 gremlin> g.addV('person').properties('name', 'Marko') gremlin> g.V().count() ==>1 gremlin> g.V().hasLabel('person').values('name') ==>Marko
- 5. MATCH (p:Planet)-[orbit:ORBITS]->(:Star {name: 'Sun'}) WHERE orbit.au < 5 RETURN p AS planet; g.V().as('p').outE('ORBITS').as('orbit').inV().as(' UNNAMED34') .where(and( select('p').hasLabel('Planet'), select(' UNNAMED34').values('name').is(eq('Sun')), select(' UNNAMED34').hasLabel('Star'), select('orbit').values('au').is(lt(5)) )) .select('p').map(project('planet').by(identity())) The gist
- 6. Clauses Other Patterns Functions MATCH RETURN UNWIND OPTIONAL MATCH WITH UNION CREATE MERGE SET DETACH DELETE ON CREATE ON MATCH WHERE ORDER BY SKIP LIMIT DISTINCT (n:L {k: ‘v’}) ()-->() ()--() ()-[r:L {k: ‘v’}]-() (n)-[r]-(m) ()-[]-()-[]-() ()-[*n]-() [x IN … | …] avg, collect, count, max, min, sum keys, labels, nodes, relationships, size type, exists, type conversion, string matching It is not guaranteed, however, that all combinations of the listed clauses, patterns, or functions will work. You are welcome to report any issues with the translation that you encounter. Cypher → Gremlin translation
- 7. ● Cypher to Gremlin translation library for Java ● Cypher for Gremlin Server (plugin) ● Cypher for Gremlin Console (plugin) ● Cypher wrapper for Gremlin client ● Neo4j driver-like API wrapper ● TCK implementation for Gremlin Cypher for Gremlin open source https://github.com/opencypher/cypher-for-gremlin
- 8. Cypher for Gremlin integration Gremlin Server without Cypher plugin Gremlin Server with Cypher plugin Gremlin driver ❌ ✔ server-side translation Cypher Gremlin client for Java ✔ client-side translation ✔ server-side translation Gremlin Console ❌ ❌ Gremlin Console with Cypher plugin ✔ client-side translation ✔ server-side translation
- 9. 59% 523 scenarios Cypher Technology Compatibility Kit
- 10. Query performance tests ● Setup: ○ “Movies” graph (171 nodes, 506 rels) ○ One benchmark = one query execution ○ Warmup: 1 iteration, 1 sec each ○ Measurement: 5 iterations, 1 sec each ● Targets: ○ Gremlin Server with TinkerGraph backend and Cypher for Gremlin plugin ○ No-op with query translation only ● Hardware: ○ Intel Core i5-6200U CPU @ 2.30GHz ○ Linux 4.14.4-1-ARCH x86_64 ○ JDK 1.8.0_144, VM 25.144-b01 ○ JMH 1.17.4 Benchmark TinkerGraph avg ms/op Translation avg ms/op allNodes 7.019 1.069 allPaths 7.208 1.495 byLabel 4.367 1.246 byLongPath 6.899 2.407 byMultiplePaths 306.611 3.442 byPath 3.902 1.923 byProperty 3.618 1.468 byUndirectedPath 5.037 2.113 byVariablePath 448.726 2.079 countWithPivot 3.917 1.790 groupByProperty 5.295 1.766 limit 3.261 1.229 orderBy 5.268 2.808 relationshipTypes 3.823 1.747 wherePropertyBetween 3.884 2.097
- 11. Java APIs: translation /* * Translation */ String cypher = "MATCH (p:Person) WHERE p.age > 25 RETURN p.name"; CypherAstWrapper ast = CypherAstWrapper.parse(cypher); Translator<String, GroovyPredicate> translator = Translator.builder().gremlinGroovy().build(); String gremlin = ast.buildTranslation(translator);
- 12. Java APIs: Gremlin Server client /* * Gremlin Server client */ Cluster cluster = Cluster.open(configuration); Client gremlinClient = cluster.connect(); CypherGremlinClient cypherGremlinClient = CypherGremlinClient.translating(gremlinClient); String cypher = "MATCH (p:person) WHERE p.age > 25 RETURN p.name"; CypherResultSet resultSet = cypherGremlinClient.submit(cypher); List<Map<String, Object>> results = resultSet.all();
- 13. Neo4j, Gremlin Server, and Cosmos DB running side-by-side