Bigquery array of STRINGs to array of INTs

Question

I'm trying to pull an array of INT64 s in BigQuery standard SQL from a column which is a long string of numbers separated by commas (for example, 2013,1625,1297,7634). I can pull an array of strings easily with:

SELECT
  SPLIT(string_col,",")
FROM
  table

However, I want to return an array of INT64 s, not an array of strings. How can I do that? I've tried

CAST(SPLIT(string_col,",") AS ARRAY<INT64>) 

but that doesn't work.

Answer 1

Below is for BigQuery Standard SQL

#standardSQL
WITH yourTable AS (
  SELECT 1 AS id, '2013,1625,1297,7634' AS string_col UNION ALL
  SELECT 2, '1,2,3,4,5'
)
SELECT id, 
  (SELECT ARRAY_AGG(CAST(num AS INT64)) 
    FROM UNNEST(SPLIT(string_col)) AS num
  ) AS num,
  ARRAY(SELECT CAST(num AS INT64) 
    FROM UNNEST(SPLIT(string_col)) AS num
  ) AS num_2
FROM yourTable