This repository was archived by the owner on Apr 22, 2020. It is now read-only.
This repository was archived by the owner on Apr 22, 2020. It is now read-only.
Cannot pass parameters in algo.dfs.stream call #930
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Description
Tried to follow instructions for passing parameters on https://neo4j.com/docs/graph-algorithms/3.5/projected-graph-model/cypher-projection/#cypher-projection-parameters
Using Neo4j 3.5.3, graph-algorithms 3.5.4.0
Example:
Query 1: setup nodes and relationships
create (:TestNode{key:1, name:"A"})-[:CONNECTS]->(:TestNode{key:2, name:"B"})
Query 2: setup param
:param name => 'B'
Query 3 succeeds, the $name param is present but not used in the projection:
MATCH (start:TestNode{key:1})
CALL algo.dfs.stream(
'match (t:TestNode) return id(t) as id',
'match (t:TestNode)-[c:CONNECTS]->(u:TestNode) return id(t) as source, id(u) as target',
'>',
id(start),
{
graph:'cypher',
params: {name: $name}
}
)
YIELD nodeIds
UNWIND nodeIds AS nodeId
WITH algo.asNode(nodeId) AS n
RETURN n
Query 4 fails:
MATCH (start:TestNode{key:1})
CALL algo.dfs.stream(
'match (t:TestNode) where t.name <> $name return id(t) as id',
'match (t:TestNode)-[c:CONNECTS]->(u:TestNode) return id(t) as source, id(u) as target',
'>',
id(start),
{
graph:'cypher',
params: {name: $name}
}
)
YIELD nodeIds
UNWIND nodeIds AS nodeId
WITH algo.asNode(nodeId) AS n
RETURN n
Error:
Neo.ClientError.Procedure.ProcedureCallFailed: Failed to invoke procedure algo.dfs.stream: Caused by: org.neo4j.cypher.ParameterNotFoundException: Expected parameter(s): name
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