BigQuery标准SQL“左”交叉连接嵌套数组

Question

我试图在包含嵌套数组的记录的表上运行查询。 在下面的例子中，嵌套数组被称为“年龄”。某些记录可能有一个空数组。

如何运行一个查询运行了“左”的交叉连接，因此，即使是在年龄没有元素的记录将被输出（一行与年龄= NULL）/

WITH people AS (
select * from unnest(
[STRUCT("Tim" as name, [5] as ages), 
    STRUCT("Jane" as name, [] as ages)]) 
) 

select 
    name 
    from people, unnest(ages) as a 

Answer 1

#standardSQL 
WITH people AS (
SELECT * FROM UNNEST(
[STRUCT("Tim" AS name, [5] AS ages), 
    STRUCT("Jane" AS name, [] AS ages)]) 
) 

SELECT 
    name 
FROM people 
LEFT JOIN UNNEST(ages) AS a