如何索引嵌套数组

Question

如何在文档上方建立索引（Couchbase 中的 N1QL 查询）以加快嵌套数组中 SerialNumber 字段的搜索速度（doc => groups => items => item.SerialNumber）？

样本：

{
  "Id": "0012ed6e-41af-4e45-b53f-bac3b2eb0b82",
  "Machine": "Machine2",
  "Groups": [        
    {
      "Id": "0fed9b14-fa38-e511-893a-001125665867",
      "Name": "Name",
      "Items": [
        {
          "Id": "64e69b14-fa38-e511-893a-001125665867",
          "SerialNumber": "1504H365",
          "Position": 73
        },
        {
          "Id": "7be69b14-fa38-e511-893a-001125665867",
          "SerialNumber": "1504H364",
          "Position": 72
        }
      ]
    },
    {
      "Id": "0fed9b14-fa38-e511-893a-001125665867",
      "Name": "Name",
      "Items": [
        {
          "Id": "64e69b14-fa38-e511-893a-001125665867",
          "SerialNumber": "1504H365",
          "Position": 73
        },
        {
          "Id": "7be69b14-fa38-e511-893a-001125665867",
          "SerialNumber": "1504H364",
          "Position": 72
        }
      ]
    }
  ]
}

我的查询：

CREATE INDEX idx_serial ON `aplikomp-bucket` 
(ALL ARRAY(ALL ARRAY i.SerialNumber FOR i IN g.Items END ) FOR g In Groups END);

Answer 1

CREATE INDEX idx_serial ON `aplikomp-bucket` (DISTINCT ARRAY(DISTINCT ARRAY i.SerialNumber FOR i IN g.Items END ) FOR g In Groups END);

SELECT META().id FROM `aplikomp-bucket` AS a
WHERE ANY g IN a.Groups SATISFIES (ANY i IN g.Items SATISFIES i.SerialNumber > 123 END) END;