Google bigquery 为什么我的BigQuery查询返回的日期与我在WHERE子句中指定的日期不同？

我有下面的问题。我只希望它返回WHERE子句中指定的日期，但是它返回的是所有数据。我已经尝试使用

\u TABLE\u后缀作为日期，但没有成功。我还能做什么

SELECT
  date,
  'iOS' as app_source,
  h.eventinfo.eventlabel,
  COUNT(1) events,
  COUNT(DISTINCT CONCAT(fullvisitorid, CAST(visitstarttime AS string))) uniqueEvents
FROM
   `XXXX1.ga_sessions_*`,
  UNNEST(hits) h
WHERE
  h.type='EVENT'
  and (h.eventInfo.eventCategory = 'Live' and h.eventInfo.eventLabel = 'Team Chat')
  or (h.eventInfo.eventCategory = 'Messages' and h.eventInfo.eventLabel = 'Direct Message')
  and date >= "20190818"
GROUP BY
  1,2,3

UNION ALL

SELECT
  date,
  'Android' as app_source,
  h.eventinfo.eventlabel,
  COUNT(1) events,
  COUNT(DISTINCT CONCAT(fullvisitorid, CAST(visitstarttime AS string))) uniqueEvents
FROM
   `XXXX2.ga_sessions_*`,
  UNNEST(hits) h
WHERE
  h.type='EVENT'
  and (h.eventInfo.eventCategory = 'Live' and h.eventInfo.eventLabel = 'Team Chat')
  or (h.eventInfo.eventCategory = 'Messages' and h.eventInfo.eventLabel = 'Direct Message')
  and date >= "20190818"
GROUP BY
  1,2,3

ORDER BY
  date

您应该修复WHERE子句，如下例所示

WHERE
  h.type='EVENT'
  and (
    (h.eventInfo.eventCategory = 'Live' and h.eventInfo.eventLabel = 'Team Chat')
    or (h.eventInfo.eventCategory = 'Messages' and h.eventInfo.eventLabel = 'Direct Message')
  )
  and date >= "20190818"