json-functions: Update status and links (#8762)

[ti-chi-bot]

This is an automated cherry-pick of #8762

What is changed, added or deleted? (Required)

Update the status of JSON functions in TiDB

mysql> CREATE TABLE t3 (id int primary key auto_increment, o_id int, attribute varchar(255), value varchar(255));
Query OK, 0 rows affected (0.12 sec)

mysql> INSERT INTO t3(o_id, attribute, value) VALUES(2,'color','red'),(2,'fabric','silk'),(3,'color','green'),(3,'shape','square');
Query OK, 4 rows affected (0.02 sec)
Records: 4  Duplicates: 0  Warnings: 0

mysql> SELECT o_id, attribute, value FROM t3;
+------+-----------+--------+
| o_id | attribute | value  |
+------+-----------+--------+
|    2 | color     | red    |
|    2 | fabric    | silk   |
|    3 | color     | green  |
|    3 | shape     | square |
+------+-----------+--------+
4 rows in set (0.00 sec)

mysql> SELECT o_id, JSON_ARRAYAGG(attribute) AS attributes
    -> FROM t3 GROUP BY o_id;
+------+---------------------+
| o_id | attributes          |
+------+---------------------+
|    3 | ["color", "shape"]  |
|    2 | ["color", "fabric"] |
+------+---------------------+
2 rows in set (0.01 sec)

mysql> SELECT tidb_version()\G
*************************** 1. row ***************************
tidb_version(): Release Version: v6.0.0
Edition: Community
Git Commit Hash: 36a9810441ca0e496cbd22064af274b3be771081
Git Branch: heads/refs/tags/v6.0.0
UTC Build Time: 2022-03-31 10:33:28
GoVersion: go1.18
Race Enabled: false
TiKV Min Version: v3.0.0-60965b006877ca7234adaced7890d7b029ed1306
Check Table Before Drop: false
1 row in set (0.01 sec)

mysql> SELECT JSON_PRETTY('{"k":"v"}');
+--------------------------+
| JSON_PRETTY('{"k":"v"}') |
+--------------------------+
| {
  "k": "v"
}           |
+--------------------------+
1 row in set (0.00 sec)

mysql> SELECT JSON_MERGE_PATCH('[1, 2]', '[true, false]');
+---------------------------------------------+
| JSON_MERGE_PATCH('[1, 2]', '[true, false]') |
+---------------------------------------------+
| [true, false]                               |
+---------------------------------------------+
1 row in set (0.00 sec)

Which TiDB version(s) do your changes apply to? (Required)

Tips for choosing the affected version(s):

By default, CHOOSE MASTER ONLY so your changes will be applied to the next TiDB major or minor releases. If your PR involves a product feature behavior change or a compatibility change, CHOOSE THE AFFECTED RELEASE BRANCH(ES) AND MASTER.

For details, see tips for choosing the affected versions.

• master (the latest development version)
• v6.1 (TiDB 6.1 versions)
• v6.0 (TiDB 6.0 versions)
• v5.4 (TiDB 5.4 versions)
• v5.3 (TiDB 5.3 versions)
• v5.2 (TiDB 5.2 versions)
• v5.1 (TiDB 5.1 versions)
• v5.0 (TiDB 5.0 versions)
• v4.0 (TiDB 4.0 versions)

What is the related PR or file link(s)?

• This PR is translated from:
• Other reference link(s): JSON "Unsupported functions" already in server #8938

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• dveeden

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[dveeden]

v5.1.3

sql> SELECT JSON_MERGE_PATCH('[1, 2]', '[true, false]') a, JSON_PRETTY('{}') b, (SELECT JSON_ARRAYAGG(x) FROM (SELECT 'a' x UNION ALL SELECT 'b') a) c, tidb_version()\G
ERROR: 1305 (42000): FUNCTION JSON_MERGE_PATCH does not exist

sql> SELECT JSON_PRETTY('{}') b, (SELECT JSON_ARRAYAGG(x) FROM (SELECT 'a' x UNION ALL SELECT 'b') a) c, tidb_version()\G
ERROR: 1105 (HY000): unsupported agg function: json_arrayagg

sql> SELECT JSON_PRETTY('{}') b, tidb_version()\G
*************************** 1. row ***************************
             b: {}
tidb_version(): Release Version: v5.1.3
Edition: Community
Git Commit Hash: dc079337ef0c9d78eec2d2acb1eb31e12117d29b
Git Branch: heads/refs/tags/v5.1.3
UTC Build Time: 2021-11-26 01:30:03
GoVersion: go1.16.4
Race Enabled: false
TiKV Min Version: v3.0.0-60965b006877ca7234adaced7890d7b029ed1306
Check Table Before Drop: false
1 row in set (0.0012 sec)

[shichun-0415]

/merge

[shichun-0415]

/remove status LGT1
/status LGT2

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 0ca231f