(pp:PublicParticipant) RETURN gp, pp, r ", " MERGE (gp)-[:REPRESENTS]->(pp) DELETE r ", {batchSize:1000, iterateList:true, parallel:false} ) YIELD total, failedOperations, errorMessages CALL apoc.util.validate(failedOperations > 0, "At least one sub-operation failed: %s", [reduce(all_errors = "", error IN keys(errorMessages) | all_errors + ", " + error)]) RETURN total; ]]>