如何在Google BigQuery中导出Google Optimize数据？

Question

所以我进行了测试，现在想使用BigQuery导出我的Google Optimize数据。 不幸的是，尽管Google Analytics（分析）中有该日期范围内的测试数据，但BigQuery Export中的变量“ experimentId”和“ experimentVariant”都是空的。

Synthax是否有问题？ StandardSQL：

SELECT 
clientId,
visitId,
fullVisitorId,
exp.experimentId AS experimentId,
exp.experimentVariant AS experimentVariant,
trafficSource.source AS source,
trafficSource.medium AS medium,
hits.page.pagePath AS pagePath,
timestamp_seconds(visitStartTime+(CAST(ROUND(hits.time/1000) AS INT64))) 
AS timestamp,
hits.eventInfo.eventCategory AS EventCategory,
hits.eventInfo.eventAction AS EventAction,
hits.eventInfo.eventLabel AS EventLabel

FROM `123456789.ga_sessions_*` LEFT JOIN
UNNEST(hits) hits LEFT JOIN
UNNEST(hits.experiment) exp

WHERE hits.page.pagePath LIKE '%page1/page2%' AND _TABLE_SUFFIX BETWEEN 
FORMAT_DATE('%Y%m%d', date '2019-04-16') AND FORMAT_DATE('%Y%m%d', date 
'2019-04-22') 

GROUP BY 
clientId,
visitId,
fullVisitorId,
experimentId,
experimentVariant,
source,
medium,
pagePath,
timestamp,
eventCategory,
EventAction,
EventLabel