如何在 Couchbase 中获取数组键和值的计数

Question

我有 3 个文档，我想获取数组中存在的键的计数。 以下是文件：-

    [
        {
            appId: "f1606a90-c96f-4db9-8e5f-9f0b6d2d2116",
            attributes: [
                {
                    "activity": "Brand Management",
                },
                {
                    "priority": "No"
                },
                {
                    "numberOfLine": 6
                }
            ]
       },
       {
           appId: "f1606a90-c96f-4db9-8e5f-9f0b6d2d2116",
           attributes: [
               {
                   "activity": "Brand Management",
               }
           ]
      },
      {
          appId: "f1606a90-c96f-4db9-8e5f-9f0b6d2d2116",
          attributes: [
              {
                  "activity": "Upsert",
              },
              {
                  "mailStatus": "Assigned"
              }
          ]
      }

查询：-

SELECT RAW
    count(1)
FROM
    workflow wf
    UNNEST wf.attributes attr
WHERE
    wf.appId = "f1606a90-c96f-4db9-8e5f-9f0b6d2d2116"
    AND
    attr.activity == 'Brand Management';

结果：-

[
   2
]

预期结果：-

[
    {
        "Brand Management" : 2
    }
]

我正在寻找结果，它将给我输出作为活动名称和该活动的计数。任何线索都会非常有帮助。