MySQL SUM json values grouped by json keys

Question

Is it possible to calculate sum of json values grouped by json keys?

Mysql version is 5.7.17 on Google cloud sql.

Example_1: A short exampl

Answer 1

SQL for the "short example":

SELECT col1,
       JSON_OBJECT('key1', SUM(value1), 'key2', SUM(value2)) AS col2
FROM
    (SELECT col1,
            JSON_EXTRACT(col2, '$.key1') AS value1,
            JSON_EXTRACT(col2, '$.key2') AS value2
     FROM tbl) subq
GROUP BY col1;