google-bigquery - 查询失败错误：查询执行期间资源超出：无法在分配的内存中执行查询

Question

我正在使用标准 SQL。即使它是一个基本查询，它仍然会抛出错误。任何建议请

SELECT 
  fullVisitorId,
  CONCAT(CAST(fullVisitorId AS string),CAST(visitId AS string)) AS session,
  date,
  visitStartTime,
  hits.time,
  hits.page.pagepath
FROM
  `XXXXXXXXXX.ga_sessions_*`,
  UNNEST(hits) AS hits
WHERE
  _TABLE_SUFFIX BETWEEN "20160801"
  AND "20170331"
ORDER BY
  fullVisitorId,
  date,
  visitStartTime

Answer 1

此查询起作用的唯一方法是删除最后应用的排序：

SELECT 
  fullVisitorId,
  CONCAT(CAST(fullVisitorId AS string),CAST(visitId AS string)) AS session,
  date,
  visitStartTime,
  hits.time,
  hits.page.pagepath
FROM
  `XXXXXXXXXX.ga_sessions_*`,
  UNNEST(hits) AS hits
WHERE
  _TABLE_SUFFIX BETWEEN "20160801"
  AND "20170331"

ORDER BY操作非常昂贵并且不能并行处理，所以尽量避免它（或尝试在有限的结果集中应用它）

Answer 2

除了接受的答案之外，您可能希望按日期对表进行分区，以减少昂贵查询使用的内存量。