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create table test (j json)
insert into test values ('{ "about": "person", "info": [ { "fName": "John", "lName": "Booker", "sex": "male", "age": 20 }, { "fName": "Laurie", "lName": "Sparks", "sex": "female" }, { "fName": "Adam", "lName": "Bate", "age": 26 } ] }')
CREATE FUNCTION filter_json(j JSON) RETURNS JSON BEGIN DECLARE n INT DEFAULT 0; DECLARE info, sex, age, data JSON; SET info = JSON_ARRAY(); WHILE JSON_CONTAINS_PATH(j, 'one', CONCAT('$.info[', n, ']')) DO SET data = JSON_OBJECT(); SET sex = JSON_EXTRACT(j, CONCAT('$.info[', n, '].sex')); IF sex IS NOT NULL THEN SET data = JSON_INSERT(data, '$.sex', sex); END IF; SET age = JSON_EXTRACT(j, CONCAT('$.info[', n, '].age')); IF age IS NOT NULL THEN SET data = JSON_INSERT(data, '$.age', age); END IF; SET info = JSON_ARRAY_APPEND(info, '$', data); SET n = n + 1; END WHILE; RETURN info; END
SELECT filter_json(j) AS filtered FROM test
filtered
[{"age": 20, "sex": "male"}, {"sex": "female"}, {"age": 26}]