作用域聚合和WHERE作用域

Question

以下查询运行并产生16行输出（通过包装在SELECT count(*) FROM (query)中进行验证）命中是重复记录。 hits.customDimensions在命中内重复。 customDimensions在主记录中重复。

SELECT 
    fullVisitorId, 
    visitId, 
    hits.page.pagePath, 
    hits.type, 
    FIRST(IF(customDimensions.index = 10, customDimensions.value, NULL)) WITHIN RECORD AS gacid, 
    FIRST(IF(hits.customDimensions.index = 11, hits.customDimensions.value, NULL)) WITHIN hits AS blogCategories 
FROM 
    [dataset.ga_sessions_20160902] 
WHERE 
    fullVisitorId ='55555555555' 

然而

SELECT 
    fullVisitorId, 
    visitId, 
    hits.page.pagePath, 
    hits.type, 
    FIRST(IF(customDimensions.index = 10, customDimensions.value, NULL)) WITHIN RECORD AS gacid, 
    FIRST(IF(hits.customDimensions.index = 11, hits.customDimensions.value, NULL)) WITHIN hits AS blogCategories 
FROM 
    [dataset.ga_sessions_20160902] 
WHERE 
    fullVisitorId ='55555555555' 
    AND hits.type = 'PAGE' 

失败

Cannot query the cross product of repeated fields customDimensions.index and hits.type. 

只返回一个（不平）记录和我的包裹数量，也没有给我真正的结果？为什么两个作用域集合可以在不同的作用域上工作，但最内层作用域上的WHERE失败？

Answer 1

，以避免产生交叉产品试试下面

SELECT 
    fullVisitorId, 
    visitId, 
    hits.page.pagePath, 
    hits.type, 
    FIRST(IF(customDimensions.index = 10, customDimensions.value, NULL)) WITHIN RECORD AS gacid, 
    FIRST(IF(hits.customDimensions.index = 11, hits.customDimensions.value, NULL)) WITHIN hits AS blogCategories 
FROM [dataset.ga_sessions_20160902] 
WHERE fullVisitorId ='55555555555' 
HAVING hits.type = 'PAGE' 

顺便说一下，在传统的SQL任何最SELECT产生扁平的结果（除非你写resuly到表相应的选项 - 大的结果和非平坦） - 这也解释了问题在你的例子中