N1QL 将许多子行连接成单个字符串

Question

考虑在 Couchbase 中我有一个人员数据库，其中包含 3 个文档：

Person A
    Child AA
        Grand AAA
        Grand AAB
    Child AB
        Grand ABA
        Grand ABB

Person B

Person C
    Child CA
    Child CB
        Grand CBA

有没有一种简单的方法可以使用 N1QL 将其转换为以下结果？ 我正在尝试将每个人及其孙子显示为字符串？

Person A, Grand: "AAA, AAB, ABA, ABB"
Person B, Grand: ""
Person C, Grand: "CBA"

Answer 1

您可以执行以下操作：

SELECT p.name AS p, ENCODE_JSON(ARRAY_AGG(g.name)) AS g
FROM person AS p LEFT OUTER UNNEST p.child AS c LEFT OUTER UNNEST c.grand AS g
GROUP BY p;