Select 存储在 Google BigQuery 中的 Firebase 事件的单行中的多个事件参数

Question

我正在尝试对存储在 Google BigQuery 中的 Firebase 事件执行一个非常简单的查询，但我找不到执行此操作的方法。

在 Android 应用程序中，我记录了这样一个事件：

Bundle params = new Bundle();
params.putInt("productID", productId);
params.putInt(FirebaseAnalytics.Param.VALUE, value);
firebaseAnalytics.logEvent("productEvent", params);

所以，在 BigQuery 中我有这样的东西：

 ___________________ _______________________ ____________________________ 
| event_dim.name    | event_dim.params.key  | event_dim.params.int_value | 
|___________________|_______________________|____________________________|
| productEvent      | productID             | 25                         | 
|                   |_______________________|____________________________| 
|                   | value                 | 1253                       |
|___________________|_______________________|____________________________|

当我从此 table 获取数据时，我得到两行：

 ___________________ _______________________ ____________________________
|event_dim.name     | event_dim.params.key  | event_dim.params.int_value |
|___________________|_______________________|____________________________|
| productEvent      | productID             | 25                         |
| productEvent      | value                 | 12353                      |

但我真正需要的是这个 table 中的 SELECT 子句来获取如下数据：

 ___________________ _____________ _________
|   name            | productID   | value   |
|___________________|_____________|_________|
| productEvent      | 25          | 12353   |

有什么想法或建议吗？

Answer 1

您可以像这样将值旋转到列中

SELECT 
  event_dim.name as name,
  MAX(IF(event_dim.params.key = "productID", event_dim.params.int_value, NULL)) WITHIN RECORD productID,
  MAX(IF(event_dim.params.key = "value", event_dim.params.int_value, NULL)) WITHIN RECORD value,
FROM [events]

如果您想使用 SQL 生成此命令，请参阅此解决方案：

Answer 2

使用standard SQL（在UI中取消选中"Show Options"下的"Use Legacy SQL"），您可以将查询表达为：

SELECT 
  event_dim.name as name,
  (SELECT value.int_value FROM UNNEST(event_dim.params)
   WHERE key = "productID") AS productID,
  (SELECT value.int_value FROM UNNEST(event_dim.params)
   WHERE key = "value") AS value
FROM `dataset.mytable` AS t,
  t.event_dim AS event_dim;

编辑：根据下面的评论更新示例以将 int_value 作为 value 的一部分包含在内。这是一个独立的示例，也演示了该方法：

WITH T AS (
  SELECT ARRAY_AGG(event_dim) AS event_dim
  FROM (
    SELECT STRUCT(
        "foo" AS name,
        ARRAY<STRUCT<key STRING, value STRUCT<int_value INT64, string_value STRING>>>[
          ("productID", (10, NULL)), ("value", (5, NULL))
        ] AS params) AS event_dim
    UNION ALL
    SELECT STRUCT(
        "bar" AS name,
        ARRAY<STRUCT<key STRING, value STRUCT<int_value INT64, string_value STRING>>>[
          ("productID", (13, NULL)), ("value", (42, NULL))
        ] AS params) AS event_dim
  )
)
SELECT 
  event_dim.name as name,
  (SELECT value.int_value FROM UNNEST(event_dim.params)
   WHERE key = "productID") AS productID,
  (SELECT value.int_value FROM UNNEST(event_dim.params)
   WHERE key = "value") AS value
FROM T AS t,
  t.event_dim AS event_dim;

Select 存储在 Google BigQuery 中的 Firebase 事件的单行中的多个事件参数

Select several event params in a single row for Firebase events stored in Google BigQuery

firebase

google-bigquery

firebase-analytics