Azure 流分析查詢返回 0 行

Question

我有來自帶有嵌套列表的 KEPServerEx 的數據，因此我需要 CROSS APPLY 將單個值從傳入流發送到我的 blob。 我使用這篇文章讓查詢工作了幾分鍾（ 通過 cql 流分析在 json msg 中迭代嵌套列表），但無法再獲得正確的輸出。

一條消息如下所示：

[
  {
    "timestamp": 1575933997508,
    "values": [
      {
        "id": "Channel1.Device1.RANDOM1",
        "v": 5,
        "q": 1,
        "t": 1575933987573
      },
      {
        "id": "Channel1.Device1.RANDOM1",
        "v": 196,
        "q": 1,
        "t": 1575933988076
      },
      {
        "id": "Channel1.Device1.RANDOM1",
        "v": 56,
        "q": 1,
        "t": 1575933988570
      },
      {
        "id": "Channel1.Device1.RANDOM1",
        "v": 104,
        "q": 1,
        "t": 1575933989077
      },
      {
        "id": "Channel1.Device1.RANDOM1",
        "v": 24,
        "q": 1,
        "t": 1575933989567
      },
      {
        "id": "Channel1.Device1.RANDOM1",
        "v": 177,
        "q": 1,
        "t": 1575933990069
      },
      {
        "id": "Channel1.Device1.RANDOM1",
        "v": 168,
        "q": 1,
        "t": 1575933990575
      },
      {
        "id": "Channel1.Device1.RANDOM1",
        "v": 113,
        "q": 1,
        "t": 1575933991067
      },
      {
        "id": "Channel1.Device1.RANDOM1",
        "v": 189,
        "q": 1,
        "t": 1575933991572
      },
      {
        "id": "Channel1.Device1.RANDOM1",
        "v": 96,
        "q": 1,
        "t": 1575933992075
      },
      {
        "id": "Channel1.Device1.RANDOM1",
        "v": 15,
        "q": 1,
        "t": 1575933992567
      },
      {
        "id": "Channel1.Device1.RANDOM1",
        "v": 179,
        "q": 1,
        "t": 1575933993074
      },
      {
        "id": "Channel1.Device1.RANDOM1",
        "v": 22,
        "q": 1,
        "t": 1575933993569
      },
      {
        "id": "Channel1.Device1.RANDOM1",
        "v": 98,
        "q": 1,
        "t": 1575933994073
      },
      {
        "id": "Channel1.Device1.RANDOM1",
        "v": 9,
        "q": 1,
        "t": 1575933994575
      },
      {
        "id": "Channel1.Device1.RANDOM1",
        "v": 142,
        "q": 1,
        "t": 1575933995071
      },
      {
        "id": "Channel1.Device1.RANDOM1",
        "v": 54,
        "q": 1,
        "t": 1575933995576
      },
      {
        "id": "Channel1.Device1.RANDOM1",
        "v": 174,
        "q": 1,
        "t": 1575933996070
      },
      {
        "id": "Channel1.Device1.RANDOM1",
        "v": 188,
        "q": 1,
        "t": 1575933996567
      },
      {
        "id": "Channel1.Device1.RANDOM1",
        "v": 45,
        "q": 1,
        "t": 1575933997073
      }
    ]
  }
]

我用來成功地將上述消息值列表拆分為單個值的查詢是：

SELECT
    event.timestamp as messageTS,
    [values].ArrayValue.id,
    [values].ArrayValue.v,
    [values].ArrayValue.t as valueTS
FROM
    brewingmqtt AS event
CROSS APPLY getarrayelements(event.eachvalue) AS [values]

不幸的是，這現在在執行測試時給了我 0 行的回報，我無法弄清楚我錯過了什么。

Answer 1

為什么要在 getArrayElements 函數中設置eachvalue ？ 您的示例數據表明它應該是 [values]。 我根據您的示例數據測試了 sql，它對我有用。

SELECT
    event.timestamp as messageTS,
    [values].ArrayValue.id,
    [values].ArrayValue.v,
    [values].ArrayValue.t as valueTS
FROM
    brewingmqtt AS event
CROSS APPLY getarrayelements(event.[values]) AS [values]

輸出：