MDEV-36503 add Pad_attribute column to INFORMATION_SCHEMA.COLLATIONS

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Adding a new column in INFORMATION_SCHEMA.COLLATIONS:

  PAD_ATTRIBUTE ENUM('PAD SPACE','NO PAD')

and a new column Pad_attribute into SHOW COLLATION.

The new column has been added after SORTLEN but before COMMENT.
This order is compatible with MySQL-8.0 order,
with the exception that MariaDB has an extra last column COMMENT:

MariaDB [test]> desc information_schema.collations;
+--------------------+----------------------------+------+-----+---------+-------+
| Field              | Type                       | Null | Key | Default | Extra |
+--------------------+----------------------------+------+-----+---------+-------+
| COLLATION_NAME     | varchar(64)                | NO   |     | NULL    |       |
| CHARACTER_SET_NAME | varchar(32)                | YES  |     | NULL    |       |
| ID                 | bigint(11)                 | YES  |     | NULL    |       |
| IS_DEFAULT         | varchar(3)                 | YES  |     | NULL    |       |
| IS_COMPILED        | varchar(3)                 | NO   |     | NULL    |       |
| SORTLEN            | bigint(3)                  | NO   |     | NULL    |       |
| PAD_ATTRIBUTE      | enum('PAD SPACE','NO PAD') | NO   |     | NULL    |       |
| COMMENT            | varchar(80)                | NO   |     | NULL    |       |
+--------------------+----------------------------+------+-----+---------+-------+

The new Pad_attribute in SHOW COLLATION has been added as the last column.
This is also compatible with MySQL:

MariaDB [test]> show collation like 'utf8mb4_bin';
+-------------+---------+------+---------+----------+---------+---------------+
| Collation   | Charset | Id   | Default | Compiled | Sortlen | Pad_attribute |
+-------------+---------+------+---------+----------+---------+---------------+
| utf8mb4_bin | utf8mb4 |   46 |         | Yes      |       1 | PAD SPACE     |
+-------------+---------+------+---------+----------+---------+---------------+

...

This commit is contained in:

Alexander Barkov

2025-04-09 11:38:33 +04:00

parent 30ed3b867a

commit cf644785e1

16 changed files with 1356 additions and 1323 deletions

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mysql-test/suite/engines/funcs/r/db_alter_collate_ascii.result

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mysql-test/suite/engines/funcs/r/db_alter_collate_utf8.result

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