如何在 AroraDB 5.7.12 中转换数组中的字符串？

Question

我知道我可以使用 MySQL 5.7.22 版本的 JSON_ARRAYAGG 函数来获得分组对象数组，但我在工作中使用旧版本。有人知道如何为 AroraDB 5.7.12 使用类似 JSON_ARRAYAGG 的函数？因为我需要将值分组到对象数组中。例如，我使用了 GROUP_CONCAT()，但结果是一串用逗号“,”分隔的对象字符串，我需要该结果是一个列表。类似的事情，例如：

This is my table:
+-----------------+---------------+
| State           | City          |
+-----------------+---------------+
| Capital Region  | Canberra      |
| New South Wales | Sydney        |
| New South Wales | Newcastle     |
| New South Wales | Central Coast |
| New South Wales | Wollongong    |
| Queensland      | Brisbane      |
| Queensland      | Gold Coast    |
| Queensland      | Townsville    |
| Queensland      | Cairns        |
| South Australia | Adelaide      |
| Tasmania        | Hobart        |
| Victoria        | Melbourne     |
| Victoria        | Geelong       |
| West Australia  | Perth         |
+-----------------+---------------+

And I want the next result:
+-----------------+--------------------------------------------------------+
| State           | Cities                                                 |
+-----------------+--------------------------------------------------------+
| Capital Region  | ["Canberra"]                                           |
| New South Wales | ["Sydney", "Newcastle", "Central Coast", "Wollongong"] |
| Queensland      | ["Brisbane", "Gold Coast", "Townsville", "Cairns"]     |
| South Australia | ["Adelaide"]                                           |
| Tasmania        | ["Hobart"]                                             |
| Victoria        | ["Melbourne", "Geelong"]                               |
| West Australia  | ["Perth"]                                              |
+-----------------+--------------------------------------------------------+

So, is there a MySQL function to this? 
Thanks for your attention!

Answer 1

结合：GROUP_CONCAT​CONCAT

SELECT CAST(CONCAT('[',GROUP_CONCAT(CONCAT('"',city,'"')),']') AS JSON) AS cities
FROM tab
GROUP BY State;

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