在Neo4jClient中使用UNWIND进行Cypher查询

Question

由于当前版本的Neo4jClient不支持UNWIND，我在重写以下Cypher查询时遇到了麻烦：

MATCH (:A{UId:someByteArray})--(b1:B)-[:C]-(b2:B)
    MATCH p = (b1)-[:C*]->(b2)
    WITH b1.someString as s1, b2.someString as s2, p, 
        EXTRACT(c IN RELATIONSHIPS(p) | c.someValue) AS valuesAlias
    UNWIND(valuesAlias) AS va
    WITH s1, s2, length(NODES(p)) as pLength, MIN(va) AS minVA
WITH s1, s2, MAX(minVA) as maxMinVA, MIN(pLength) AS minPL
RETURN s1, s2, maxMinVA

上面的查询是Solve the Widest Path Problem in Cypher

的变体

Answer 1

为了记录，现在Neo4jClient支持UNWIND。

Answer 2

基本上需要用REDUCE / CASE语句替换UNWIND / MIN，如以下查询所示：

MATCH (:A{UId:someByteArray})--(b1:B)-[:C]-(b2:B)
    MATCH p = (b1)-[:C*]->(b2)
    WITH b1.someString as s1, b2.someString as s2, p, 
        EXTRACT(c IN RELATIONSHIPS(p) | c.someValue) AS valuesAlias
    WITH s1, s2, p, length(NODES(p)) as pLength, 
        REDUCE(curVA=9999999999, va in valuesAlias |
            CASE
                WHEN va < curVA THEN va
                ELSE curVA
            END
        ) AS minVA
WITH s1, s2, MAX(minVA) as maxMinVA, MIN(pLength) AS minPL
RETURN s1, s2, maxMinVA

产生的结果完全相同，包括排序，但我想这一般不能保证。