Bigquery Split with comma in data

Question

Below is my source table, need expected result but getting incorrect result for the below query. Please help

Query:

select ID, metric, value from ( SELECT *, REGEXP_REPLACE(SPLIT(pair, ':')[OFFSET(0)], r'^"|"$', '') metric, REGEXP_REPLACE(SPLIT(pair, ':')[OFFSET(1)], r'^"|"$', '') value FROM, UNNEST(SPLIT(REGEXP_REPLACE(to_json_string(), r'{|}', ''))) pair ) where metric not in (ID) order by metric, value;

Expected result:

incorrect result with above query:

Answer 1

as far as I can see there is no need to touch the Value column as you only add a column named "metric"

I would suggest working with an Case statement

Answer 2

The source is having dynamic columns. Hence, we can't hard code any columns except ID.