无法识别的名称：在 BigQuery 中使用 UNNEST WHERE 时

问题描述

我正在尝试按照 this blog 在 BigQuery 中的 unnest 期间进行过滤，但我无法使模式正常工作。

博客中可重现的示例效果非常好。

SELECT event_name,event_timestamp,user_pseudo_id,event_params
FROM `firebase-public-project.analytics_153293282.events_20181003`
WHERE event_name = "level_complete_quickplay"

SELECT event_name,(SELECT value.int_value FROM UNnesT(event_params) 
    WHERE key = "value") AS score
FROM `firebase-public-project.analytics_153293282.events_20181003`
WHERE event_name = "level_complete_quickplay"

当我在自己的桌子上尝试此操作时，出现错误 Unrecognised name:。我尝试在玩具表 nested_seq 中重现错误。

WITH sequences AS (
  SELECT 
    [0,1,2,3,5] AS some_numbers
    UNION ALL SELECT [2,4,8,16,32] AS some_numbers
    UNION ALL SELECT [5,10] AS some_numbers
),-- table containing repeated record
nested_seq AS (
  SELECT 
    some_numbers,some_numbers[OFFSET(1)] AS offset_1,some_numbers[ORDINAL(1)] AS ordinal_1
  FROM sequences
)
-- transformation to extract single value from array
SELECT *
FROM nested_seq
LEFT JOIN (SELECT 
  some_numbers
  FROM UNnesT(some_numbers)
  WHERE some_numbers = 2)
-- Unrecognized name: some_numbers at [21:19]

我期望的是可以提取 some_numbers 的元素，以便我可以在不增加行数的情况下取消嵌套数组。

行	some_numbers	offset_1	ordinal_1
1	2	1	0
2	2	4	2
3	空	10	5

解决方法

... 可以提取 some_numbers 的元素，以便我可以在不增加行数的情况下取消嵌套数组。

考虑下面的“修复”

WITH sequences AS (
  SELECT 
    [0,1,2,3,5] AS some_numbers
    UNION ALL SELECT [2,4,8,16,32] AS some_numbers
    UNION ALL SELECT [5,10] AS some_numbers
)
SELECT # some_numbers,(SELECT some_number
    FROM t.some_numbers some_number
    WHERE some_number = 2
  ) some_number,some_numbers[OFFSET(1)] AS offset_1,some_numbers[ORDINAL(1)] AS ordinal_1
FROM sequences t

带输出

google-bigquery sql sql unnest