Updating nested array in BigQuery based on value in another column

Question

I have a problem with BigQuery syntax that I\'m a bit stuck on. I have an entry in a table that has multiple key value pairs as an array and I would like to update only a single

Answer 1

Below is for BigQuery Standard SQL

See corrected version of very yours code

SET
event_params = ARRAY(
  SELECT AS STRUCT * REPLACE(
    CASE WHEN event_param.key = 'programName' THEN
      (SELECT AS STRUCT * REPLACE('anonymous' AS string_value) FROM UNNEST([value]))
    ELSE value
   END AS value
  ) 
  FROM UNNEST(event_params) AS event_param 
)

Also, note - you can remove reference to event_param as in below example

SET
event_params = ARRAY(
  SELECT AS STRUCT * REPLACE(
    CASE WHEN key = 'programName' THEN
      (SELECT AS STRUCT * REPLACE('anonymous' AS string_value) FROM UNNEST([value]))
    ELSE value
   END AS value
  ) 
  FROM UNNEST(event_params)  
)