google-bigquery - 查询失败错误 : Resources exceeded during query execution: The query could not be executed in the allotted memory

Question

我使用的是标准 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

此查询工作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，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)