无法识别的名称：在 BigQuery 中使用 UNNEST WHERE 时

Question

I'm trying to filter during an unnest in BigQuery as per this blog , but I can't get the pattern working.

The reproducible example in the blog works really nicely.

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, event_timestamp, user_pseudo_id, 
  (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"

When I try this on my own table I get the error Unrecognised name: . I've tried to reproduce the error in a toy table, nested_seq .

WITH sequences AS (
  SELECT 
    [0, 1, 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] 

What I'm expecting is that elements of some_numbers can be extracted so that I can unnest a nested array without increasing the number of rows.

Row	some_numbers	offset_1	ordinal_1
1	2	1	0
2	2	4	2
3	null	10	5

Answer 1

... elements of some_numbers can be extracted so that I can unnest a nested array without increasing the number of rows.

Consider below "fix"

WITH sequences AS (
  SELECT 
    [0, 1, 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

with output