Details
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New Feature
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Status: Closed (View Workflow)
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Critical
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Resolution: Fixed
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A new column PAD_ATTRIBUTE was been added to INFORMATION_SCHEMA.COLLATIONS and SHOW COLLATION that shows whether a collation is PAD SPACE or NOPAD.
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Q2/2025 Development
Description
Add column to INFORMATION_SCHEMA.COLLATIONS that shows whether collation is PAD SPACE or NOPAD. For compatibility let's use same values and same column name as in MYSQL
INFORMATION_SCHEMA.COLLATIONS
Let's add the new column after SORTLEN (before COMMENT), so the new structure looks like this:
MariaDB [test]> desc information_schema.collations;
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+--------------------+----------------------------+------+-----+---------+-------+
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| Field | Type | Null | Key | Default | Extra |
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+--------------------+----------------------------+------+-----+---------+-------+
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| COLLATION_NAME | varchar(64) | NO | | 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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| IS_DEFAULT | varchar(3) | YES | | NULL | |
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| IS_COMPILED | varchar(3) | NO | | NULL | |
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| SORTLEN | bigint(3) | NO | | NULL | |
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| PAD_ATTRIBUTE | enum('PAD SPACE','NO PAD') | NO | | NULL | |
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| COMMENT | varchar(80) | NO | | NULL | |
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+--------------------+----------------------------+------+-----+---------+-------+
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The above order will be compatible with MySQL-8.0 order (with the exception that MariaDB has an extra last column COMMENT):
+--------------------+----------------------------+------+-----+---------+-------+
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| Field | Type | Null | Key | Default | Extra |
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+--------------------+----------------------------+------+-----+---------+-------+
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| COLLATION_NAME | varchar(64) | NO | | NULL | |
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| CHARACTER_SET_NAME | varchar(64) | NO | | NULL | |
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| ID | bigint unsigned | NO | | 0 | |
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| IS_DEFAULT | varchar(3) | NO | | | |
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| IS_COMPILED | varchar(3) | NO | | | |
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| SORTLEN | int unsigned | NO | | NULL | |
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| PAD_ATTRIBUTE | enum('PAD SPACE','NO PAD') | NO | | NULL | |
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+--------------------+----------------------------+------+-----+---------+-------+
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SHOW COLLATION
Let's also add this new column to SHOW COLLATION as the last column, as follows:
MariaDB [test]> show collation like 'utf8mb4_bin';
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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_bin | utf8mb4 | 46 | | Yes | 1 | PAD SPACE |
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+-------------+---------+------+---------+----------+---------+---------------+
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This will be compatible with MySQL's SHOW COLLATION:
+-------------+---------+----+---------+----------+---------+---------------+
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| Collation | Charset | Id | Default | Compiled | Sortlen | Pad_attribute |
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+-------------+---------+----+---------+----------+---------+---------------+
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| utf8mb4_bin | utf8mb4 | 46 | | Yes | 1 | PAD SPACE |
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+-------------+---------+----+---------+----------+---------+---------------+
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Attachments
Issue Links
- relates to
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