带有TABLE_DATE_RANGE的FLATTEN

Question

我在数据集中有一系列表,需要在FLATTENing其中一个重复记录时查询所有表.例如,像下面这样的查询工作正常:

 SELECT
   date,
   customDimensions.value AS customDimension,
   hits.page.pagePath AS pagePath
FROM
   (FLATTEN( [<projectId>:<datasetId>.ga_sessions_20130910] ,
   customDimensions)) 
WHERE
   hits.page.pagePath CONTAINS '/helmets' 
   AND customDimensions.index IN (1,2,3)

但是,我在使用表通配符时遇到了FLATTENing问题.有人可以帮我解决语法问题吗？可以在TABLE_DATE_RANGE中使用FLATTEN吗？

SELECT
   date,
   customDimensions.value AS customDimension,
   hits.page.pagePath AS pagePath
FROM
   (FLATTEN (TABLE_DATE_RANGE ([<project>:<dataset>.ga_sessions_],
   TIMESTAMP('2013-09-10'),
   TIMESTAMP ('2014-06-10'))),
   customDimensions) 
WHERE
   hits.page.pagePath CONTAINS '/helmets' 
   AND customDimensions.index IN (1,2,3)

谢谢,沙燕

Answer 1

根据参考手册,FLATTEN语法是:

...(FLATTEN ([project_name:]datasetId.tableId, flattenField))..
...(FLATTEN (subselect_clause, flattenField))..

基于此,我会尝试在FLATTEN语句中添加一个subselect子句,如下所示:

SELECT
date,
customDimensions.value AS customDimension,
hits.page.pagePath AS pagePath
FROM
FLATTEN(
(SELECT date, customDimensions, hits FROM TABLE_DATE_RANGE ([<project>:<dataset>.ga_sessions_],
TIMESTAMP('2013-09-10'),TIMESTAMP ('2014-06-10')))
, customDimensions)
WHERE
hits.page.pagePath CONTAINS '/helmets' 
AND customDimensions.index IN (1,2,3)