Neo4j Cypher手动关系索引，APOC触发和数据复制

Question

我有以下查询使用普通关系操作进行节点过滤：

MATCH (dg:DecisionGroup)-[:CONTAINS]->(childD:Decision) 
WHERE dg.id = 1 
MATCH (childD)-[relationshipValueRel2:HAS_VALUE_ON]->(filterCharacteristic2:Characteristic) 
WHERE filterCharacteristic2.id = 2 
WITH relationshipValueRel2, childD, dg  
WHERE   (ANY (id IN [".NET"] WHERE id IN relationshipValueRel2.value ))  
RETURN childD.name

只返回一个节点（正如预期的那样）：

"Candidate1"

PROFILE输出：

我想优化查询性能，这就是为什么我使用以下触发器将关系添加到手动索引中的原因：

CALL apoc.trigger.add('HAS_VALUE_ON_ASSIGNED_RELATIONSHIP_PROPERTIES_TRIGGER', "UNWIND keys({assignedRelationshipProperties}) AS key 
UNWIND {assignedRelationshipProperties}[key] AS map 
WITH map 
WHERE type(map.relationship) = 'HAS_VALUE_ON' 
CALL apoc.index.addRelationship(map.relationship, keys(map.relationship))  RETURN true", 
{phase:'before'})

和以下查询，以获取与第一个相同的数据，但仅来自手动索引：

MATCH (dg:DecisionGroup)-[:CONTAINS]->(childD:Decision) 
WHERE dg.id = 1 
MATCH (childD)-[relationshipValueRel2:HAS_VALUE_ON]->(filterCharacteristic2:Characteristic) 
WHERE filterCharacteristic2.id = 2 
WITH relationshipValueRel2, filterCharacteristic2, childD, dg   
CALL apoc.index.in(filterCharacteristic2,'HAS_VALUE_ON','(value:(".NET"))') 
YIELD node WITH node AS childD 
RETURN childD.name

但问题是，此查询返回同一节点的两个实例：

"Candidate1"
"Candidate1"

PROFILE输出：

我做错了什么以及为什么这个查询返回2个实例而不是单个实例？