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Update pad attribute where needed (#20823) (#20910)
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‎character-set-and-collation.md

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### Character set and collation naming
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A character set can have multiple collations, named in the `<character_set>_<collation_properties>` format. For example, the `utf8mb4` character set has a collation called `utf8mb4_bin`, which is a binary collation for `utf8mb4`. Multiple collation properties can be included in the name, separated by underscores (`_`).
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A character set can have multiple collations, named in the `<character_set>_<collation_properties>` format. For example, the `utf8mb4` character set has a collation called `utf8mb4_bin`, which is a binary collation for `utf8mb4`. Multiple collation properties can be included in the name, separated by underscores (`_`).
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The following table shows the common collation properties and meanings.
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```
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```sql
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+--------------------+---------+------+---------+----------+---------+
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| Collation | Charset | Id | Default | Compiled | Sortlen |
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+--------------------+---------+------+---------+----------+---------+
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| utf8mb4_0900_ai_ci | utf8mb4 | 255 | | Yes | 1 |
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| utf8mb4_0900_bin | utf8mb4 | 309 | | Yes | 1 |
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| utf8mb4_bin | utf8mb4 | 46 | Yes | Yes | 1 |
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| utf8mb4_general_ci | utf8mb4 | 45 | | Yes | 1 |
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| utf8mb4_unicode_ci | utf8mb4 | 224 | | Yes | 1 |
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+--------------------+---------+------+---------+----------+---------+
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5 rows in set (0.00 sec)
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+--------------------+---------+-----+---------+----------+---------+---------------+
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| Collation | Charset | Id | Default | Compiled | Sortlen | Pad_attribute |
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+--------------------+---------+-----+---------+----------+---------+---------------+
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| utf8mb4_0900_ai_ci | utf8mb4 | 255 | | Yes | 0 | NO PAD |
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| utf8mb4_0900_bin | utf8mb4 | 309 | | Yes | 1 | NO PAD |
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| utf8mb4_bin | utf8mb4 | 46 | Yes | Yes | 1 | PAD SPACE |
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| utf8mb4_general_ci | utf8mb4 | 45 | | Yes | 1 | PAD SPACE |
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| utf8mb4_unicode_ci | utf8mb4 | 224 | | Yes | 8 | PAD SPACE |
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+--------------------+---------+-----+---------+----------+---------+---------------+
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5 rows in set (0.001 sec)
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```
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For details about the TiDB support of the GBK character set, see [GBK](/character-set-gbk.md).

‎information-schema/information-schema-collations.md

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The `COLLATIONS` table provides a list of collations that correspond to character sets in the `CHARACTER_SETS` table. Currently, this table is included only for compatibility with MySQL.
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{{< copyable "sql" >}}
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```sql
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USE information_schema;
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DESC collations;
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+--------------------+-------------+------+------+---------+-------+
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| COLLATION_NAME | varchar(32) | YES | | NULL | |
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| CHARACTER_SET_NAME | varchar(32) | YES | | NULL | |
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| ID | bigint(11) | YES | | NULL | |
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| ID | bigint | YES | | NULL | |
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| IS_DEFAULT | varchar(3) | YES | | NULL | |
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| IS_COMPILED | varchar(3) | YES | | NULL | |
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| SORTLEN | bigint(3) | YES | | NULL | |
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| SORTLEN | bigint | YES | | NULL | |
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| PAD_ATTRIBUTE | varchar(9) | YES | | NULL | |
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+--------------------+-------------+------+------+---------+-------+
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```
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{{< copyable "sql" >}}
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```sql
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SELECT * FROM collations WHERE character_set_name='utf8mb4';
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```
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```sql
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+--------------------+--------------------+------+------------+-------------+---------+
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| COLLATION_NAME | CHARACTER_SET_NAME | ID | IS_DEFAULT | IS_COMPILED | SORTLEN |
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+--------------------+--------------------+------+------------+-------------+---------+
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| utf8mb4_bin | utf8mb4 | 46 | Yes | Yes | 1 |
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| utf8mb4_general_ci | utf8mb4 | 45 | | Yes | 1 |
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| utf8mb4_unicode_ci | utf8mb4 | 224 | | Yes | 1 |
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+--------------------+--------------------+------+------------+-------------+---------+
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+--------------------+--------------------+------+------------+-------------+---------+---------------+
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| COLLATION_NAME | CHARACTER_SET_NAME | ID | IS_DEFAULT | IS_COMPILED | SORTLEN | PAD_ATTRIBUTE |
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+--------------------+--------------------+------+------------+-------------+---------+---------------+
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| utf8mb4_0900_ai_ci | utf8mb4 | 255 | | Yes | 0 | NO PAD |
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| utf8mb4_0900_bin | utf8mb4 | 309 | | Yes | 1 | NO PAD |
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| utf8mb4_bin | utf8mb4 | 46 | Yes | Yes | 1 | PAD SPACE |
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| utf8mb4_general_ci | utf8mb4 | 45 | | Yes | 1 | PAD SPACE |
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| utf8mb4_unicode_ci | utf8mb4 | 224 | | Yes | 8 | PAD SPACE |
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+--------------------+--------------------+------+------------+-------------+---------+---------------+
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```
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The description of columns in the `COLLATIONS` table is as follows:
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* `IS_DEFAULT`: Whether this collation is the default collation of the character set it belongs to.
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* `IS_COMPILED`: Whether the character set is compiled into the server.
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* `SORTLEN`: The minimum length of memory allocated when the collation sorts characters.
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* `PAD_ATTRIBUTE`: Whether trailing spaces are ignored during string comparison. `PAD SPACE` means that trailing spaces are ignored (for example, `'abc'` equals `'abc '`), while `NO PAD` means that trailing spaces are significant (for example, `'abc'` does not equal `'abc '`).
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## See also
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‎sql-statements/sql-statement-show-collation.md

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```
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```sql
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+--------------------+---------+-----+---------+----------+---------+
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| Collation | Charset | Id | Default | Compiled | Sortlen |
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+--------------------+---------+-----+---------+----------+---------+
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| utf8mb4_0900_ai_ci | utf8mb4 | 255 | | Yes | 1 |
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| utf8mb4_0900_bin | utf8mb4 | 309 | | Yes | 1 |
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| utf8mb4_bin | utf8mb4 | 46 | Yes | Yes | 1 |
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| utf8mb4_general_ci | utf8mb4 | 45 | | Yes | 1 |
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| utf8mb4_unicode_ci | utf8mb4 | 224 | | Yes | 1 |
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+--------------------+---------+-----+---------+----------+---------+
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+--------------------+---------+-----+---------+----------+---------+---------------+
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| Collation | Charset | Id | Default | Compiled | Sortlen | Pad_attribute |
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+--------------------+---------+-----+---------+----------+---------+---------------+
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| utf8mb4_0900_ai_ci | utf8mb4 | 255 | | Yes | 0 | NO PAD |
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| utf8mb4_0900_bin | utf8mb4 | 309 | | Yes | 1 | NO PAD |
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| utf8mb4_bin | utf8mb4 | 46 | Yes | Yes | 1 | PAD SPACE |
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| utf8mb4_general_ci | utf8mb4 | 45 | | Yes | 1 | PAD SPACE |
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| utf8mb4_unicode_ci | utf8mb4 | 224 | | Yes | 8 | PAD SPACE |
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+--------------------+---------+-----+---------+----------+---------+---------------+
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5 rows in set (0.001 sec)
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```
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## MySQL compatibility

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