Call gds.bridges.* leads to NullPointerException when leaving out "remainingSizes"

[JohT]

Describe the bug

CALL gds.bridges.stream('name') YIELD from, to without the field remainingSizes leads to the following error message:

{
  "code": "Neo.ClientError.Procedure.ProcedureCallFailed",
  "message": "Failed to invoke procedure `gds.bridges.stream`: Caused by: java.lang.NullPointerException: Cannot load from long array because the return value of \"org.neo4j.gds.bridges.Bridge.remainingSizes()\" is null"
}

The error also occurs with the write method. Adding the field remainingSizes in the YIELD statement fixes the issue (as a workaround).

To Reproduce

• GDS version: 2.15.0 (and 2.16.0)
• Neo4j version: 2025.02.0 and 2025.03.0
• Operating system: Neo4j Sandbox (and Mac OS Sonoma local)

Steps to reproduce the behavior

• Create a (free) sandbox.neo4j.com

• Use the basic "Graph Data Science" template

• Create an undirected projection like this:

  CALL gds.graph.project(
      'airport-projection',
      'Airport',
      {
          HAS_ROUTE: {
              orientation: 'UNDIRECTED'
          }
      },
      {
          relationshipProperties: ['distance'],
          nodeProperties: ['altitude', 'runways', 'longest']
      }
  )
   YIELD graphName, nodeCount, relationshipCount
  RETURN graphName, nodeCount, relationshipCount

• Run the bridges algorithm:

  CALL gds.bridges.stream('airport-projection') YIELD from, to

[vnickolov]

@JohT thank you for reporting this, we will have a look and will get back to you.

[vnickolov]

Out of curiosity, what dataset are you using?

[JohT]

The basic "Graph Data Science" template in the free Sandbox

[vnickolov]

Thanks, we have identified the issue and we're working on a fix, in the meantime if this is blocking for you please yield the remainingSizes field even though you may not use it, that should produce results for you to work with.