Question

我在下面针对我们的移动应用数据编写了以下查询。由于用户数量众多，在底部添加"Resources exceeded during query execution: The query could not be executed in the allotted memory"时遇到400请求错误ORDER BY。

问题：我可以做些什么来优化查询，但仍然保留底部的ORDER BY？

我已经添加了Firebase的演示数据集，但是我认为他们的数据集太小而没有问题（相比之下，我的数据集有5到1000万个记录）。

SELECT 
  f.user_pseudo_id,
  f.event_timestamp, 
  DATE(TIMESTAMP_MICROS(f.event_timestamp)) as event_timestamp_date,
  f.event_name,
  f.user_first_touch_timestamp,
  DATE(TIMESTAMP_MICROS(f.user_first_touch_timestamp)) as user_first_touch_date,
  CASE WHEN r.has_appRemove >= 1 THEN "removed" ELSE "not-removed" END AS status_after_first7days
FROM `firebase-analytics-sample-data.ios_dataset.app_events_*` f
LEFT JOIN (
    SELECT user_pseudo_id, 1 has_appRemove
    FROM `firebase-analytics-sample-data.ios_dataset.app_events_*`
    WHERE DATE(TIMESTAMP_MICROS(user_first_touch_timestamp)) >= DATE_SUB(CURRENT_DATE(), INTERVAL 10 DAY)
      AND DATE(TIMESTAMP_MICROS(user_first_touch_timestamp)) < DATE_SUB(CURRENT_DATE(), INTERVAL 9 DAY)
      AND _TABLE_SUFFIX >= FORMAT_DATE('%Y%m%d', DATE_SUB(CURRENT_DATE(), INTERVAL 10 DAY))
      AND _TABLE_SUFFIX < FORMAT_DATE('%Y%m%d', DATE_SUB(CURRENT_DATE(), INTERVAL 3 DAY))
      AND platform = "ANDROID"
      AND event_name = "app_remove"
    GROUP BY user_pseudo_id
    ) r on f.user_pseudo_id = r.user_pseudo_id
WHERE
  DATE(TIMESTAMP_MICROS(user_first_touch_timestamp)) >= DATE_SUB(CURRENT_DATE(), INTERVAL 10 DAY)
  AND DATE(TIMESTAMP_MICROS(user_first_touch_timestamp)) < DATE_SUB(CURRENT_DATE(), INTERVAL 9 DAY)
  AND _TABLE_SUFFIX >= FORMAT_DATE('%Y%m%d', DATE_SUB(CURRENT_DATE(), INTERVAL 10 DAY))
  AND _TABLE_SUFFIX < FORMAT_DATE('%Y%m%d', DATE_SUB(CURRENT_DATE(), INTERVAL 3 DAY))
  AND platform = "ANDROID" 
ORDER BY 1,2 ASC

Answer 1

您可以应用开窗/分析功能而不是加入连接-如下面的示例（未测试）

#standardSQL
SELECT 
  user_pseudo_id,
  event_timestamp, 
  DATE(TIMESTAMP_MICROS(event_timestamp)) AS event_timestamp_date,
  event_name,
  user_first_touch_timestamp,
  DATE(TIMESTAMP_MICROS(user_first_touch_timestamp)) AS user_first_touch_date,
  COUNTIF(event_name = "app_remove") OVER(PARTITION BY user_pseudo_id) > 0 isRemoved
FROM `firebase-analytics-sample-data.ios_dataset.app_events_*` 
WHERE
  DATE(TIMESTAMP_MICROS(user_first_touch_timestamp)) >= DATE_SUB(CURRENT_DATE(), INTERVAL 10 DAY)
  AND DATE(TIMESTAMP_MICROS(user_first_touch_timestamp)) < DATE_SUB(CURRENT_DATE(), INTERVAL 9 DAY)
  AND _TABLE_SUFFIX >= FORMAT_DATE('%Y%m%d', DATE_SUB(CURRENT_DATE(), INTERVAL 10 DAY))
  AND _TABLE_SUFFIX < FORMAT_DATE('%Y%m%d', DATE_SUB(CURRENT_DATE(), INTERVAL 3 DAY))
  AND platform = "ANDROID" 
ORDER BY 1,2 ASC

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