Extracting nested JSON using json_extract_array: getting null results on populated data fields? - sql

Question

I am attempting to extract the following configuration data from this nested json file (Image of JSON file), using this query:
SELECT
json_extract_scalar(f, '$.affiliationTypes') as affiliation_types
, json_extract_scalar(f, '$.organizationTypes') as organization_types
, json_extract_scalar(f, '$.verificationTypes') as verification_types
, json_extract_scalar(f, '$.notifierIds') as notifier_ids
, json_extract_scalar(f, '$.metadata') as metadata
, json_extract_scalar(body, '$.accountId') as account_id
FROM `my database`
left join unnest(json_extract_array(body, '$.request.config')) as f
LIMIT 100;
but am getting null results for all of the selected config data. I've even filtered on accounts/requests where I know there is config data listed still nothing. Any ideas? (many of these fields have data I've just nulled them out for this post).
AS an example, I would like for the first select statement to output: STUDENT_PART_TIME, EMPLOYEE, FACULTY, VETERAN, STUDENT_FULL_TIME, ACTIVE_DUTY
For those who dont want to open image, this is the json chunk I'm interested in:
"body": {
"accountId":""
,"activeAffiliationTypes":[]
,"affiliations":[]
,"aggregateState":"OPEN"
,"birthMonth":null
,"birthYear":null
,"customerFacingConclusiveVerificationType":null
,"customerFacingRequestedAffiliationType":""
,"dataSourceErrorCodes":null
,"dataSourceResponseHttpStatusCategory":"UNKNOWN"
,"dataSourceResponseHttpStatusCode":-1
,"emailDomain":null
,"errorCodes":[]
,"errors":[]
,"issuedRewards":[]
,"metadata":{}
,"request": {
"accountId":""
,"active":false
,"assetMap":{}
,"config": {
"affiliationTypes":["STUDENT_PART_TIME","EMPLOYEE","FACULTY","VETERAN","STUDENT_FULL_TIME","ACTIVE_DUTY"]
,"assetTypes":[]
,"consolationRewardIds":[]
,"ignoreVerifierClasses":null
,"locale":"en_US"
,"metadata":{}
,"notifierIds":null
,"organizationTypes":[]
,"rewardIds":[]
,"testMode":false
,"verificationModelClass":""
,"verificationSourceClasses":[]
,"verificationTypes":["AUTHORITATIVE"]
}
,"created":null

Answer 1

SELECT STRING(c)
FROM 'my database'
LEFT JOIN UNNEST(
JSON_QUERY_ARRAY(body, '$.request.config.affiliationTypes')
) c