I'm trying to pull some relational info into a JSON string via MySQL. However, the method that I'm using seems to truncate the returned value.

Does MyQSL enforce some kind of max string length for queries using `CONCAT` / `GROUP_CONCAT` / `JSON_OBJECT` ? Can I override this?

```
(SELECT
    CONCAT(
        '[',
            GROUP_CONCAT(
                JSON_OBJECT(
                    'my_key_1', my_table.my_val_1,
                    'my_key_2', my_table.my_val_2,
                    'my_key_3', my_table.my_val_3,
                    'my_key_4', my_table.my_val_4,
                    ## [etc, etc ...]
                )
            ),
        ']' 
    )
    FROM my_table
) AS my_alias

```