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  1. MariaDB Server
  2. MDEV-13320

virtual columns fail when expression references auto increment column

Details

    Description

      The following create statement fails on 10.2.7:

      CREATE TABLE t1 ( id INT NOT NULL AUTO_INCREMENT, v INT AS (id) VIRTUAL, PRIMARY KEY (id) ) ENGINE=InnoDB;

      Giving the error:
      #1901 - Function or expression 'AUTO_INCREMENT' cannot be used in the GENERATED ALWAYS AS clause of `id`

      The same create statement works fine on 10.1.22

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          relates to

          Bug - A problem which impairs or prevents the functions of the product. MDEV-12936 upgrade to 10.2.6 failed upon tables with virtual columns

          • Blocker - Blocks development and/or testing work, production could not run.
          • Closed

          Activity

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            honso Taylor Honsowetz created issue -
            honso Taylor Honsowetz made changes -
            Field Original Value New Value
            honso Taylor Honsowetz made changes -
            Description The following create statement fails on 10.2.7:

            {{CREATE TABLE t1 ( i INT NOT NULL AUTO_INCREMENT, v INT AS (i) VIRTUAL, PRIMARY KEY (i) ) ENGINE=InnoDB;}}

            Giving the error:
            {{#1901 - Function or expression 'AUTO_INCREMENT' cannot be used in the GENERATED ALWAYS AS clause of `i`}}

            The same create statement works fine on 10.1.22             		The following create statement fails on 10.2.7:

            CREATE TABLE t1 ( i INT NOT NULL AUTO_INCREMENT, v INT AS (i) VIRTUAL, PRIMARY KEY (i) ) ENGINE=InnoDB;

            Giving the error:
            #1901 - Function or expression 'AUTO_INCREMENT' cannot be used in the GENERATED ALWAYS AS clause of `i`

            The same create statement works fine on 10.1.22
            honso Taylor Honsowetz made changes -
            Description The following create statement fails on 10.2.7:

            CREATE TABLE t1 ( i INT NOT NULL AUTO_INCREMENT, v INT AS (i) VIRTUAL, PRIMARY KEY (i) ) ENGINE=InnoDB;

            Giving the error:
            #1901 - Function or expression 'AUTO_INCREMENT' cannot be used in the GENERATED ALWAYS AS clause of `i`

            The same create statement works fine on 10.1.22             		The following create statement fails on 10.2.7:

            CREATE TABLE t1 ( id INT NOT NULL AUTO_INCREMENT, v INT AS (id) VIRTUAL, PRIMARY KEY (id) ) ENGINE=InnoDB;

            Giving the error:
            #1901 - Function or expression 'AUTO_INCREMENT' cannot be used in the GENERATED ALWAYS AS clause of `id`

            The same create statement works fine on 10.1.22
            serg Sergei Golubchik added a comment -

            This is intentional. Generated columns do not work with auto-incremented columns, they won't see the value. We've introduced the limitation in MDEV-11117. It's the same in MySQL 5.7.

            In 10.1 (and earlier version) this was allowed, but it did not work correctly.

            To let generated columns work with auto-increment would need a rather big internal refactoring. We want to do that, but it's not a change for 10.2.

            serg Sergei Golubchik added a comment - This is intentional. Generated columns do not work with auto-incremented columns, they won't see the value. We've introduced the limitation in MDEV-11117 . It's the same in MySQL 5.7. In 10.1 (and earlier version) this was allowed, but it did not work correctly. To let generated columns work with auto-increment would need a rather big internal refactoring. We want to do that, but it's not a change for 10.2.
            serg Sergei Golubchik made changes -
            Fix Version/s N/A [ 14700 ]
            Assignee Sergei Golubchik [ serg ]
            Resolution Not a Bug [ 6 ]
            Status Open [ 1 ] Closed [ 6 ]
            serg Sergei Golubchik made changes -
            Description The following create statement fails on 10.2.7:

            CREATE TABLE t1 ( id INT NOT NULL AUTO_INCREMENT, v INT AS (id) VIRTUAL, PRIMARY KEY (id) ) ENGINE=InnoDB;

            Giving the error:
            #1901 - Function or expression 'AUTO_INCREMENT' cannot be used in the GENERATED ALWAYS AS clause of `id`

            The same create statement works fine on 10.1.22             		The following create statement fails on 10.2.7:
            {code:sql}
            CREATE TABLE t1 ( id INT NOT NULL AUTO_INCREMENT, v INT AS (id) VIRTUAL, PRIMARY KEY (id) ) ENGINE=InnoDB;
            {code}
            Giving the error:
            #1901 - Function or expression 'AUTO_INCREMENT' cannot be used in the GENERATED ALWAYS AS clause of `id`

            The same create statement works fine on 10.1.22
            honso Taylor Honsowetz added a comment -

            If this is intentional, it should be included within the documentation for AUTO_INCREMENT.

            Currently this is an undocumented incompatible change between 10.1 and 10.2.

            honso Taylor Honsowetz added a comment - If this is intentional, it should be included within the documentation for AUTO_INCREMENT. Currently this is an undocumented incompatible change between 10.1 and 10.2.
            serg Sergei Golubchik made changes -
            Assignee Sergei Golubchik [ serg ] Ian Gilfillan [ greenman ]
            serg Sergei Golubchik made changes -
            Resolution Not a Bug [ 6 ]
            Status Closed [ 6 ] Stalled [ 10000 ]
            serg Sergei Golubchik made changes -
            Component/s Documentation [ 10903 ]
            greenman Ian Gilfillan added a comment -

            Documented in:
            https://mariadb.com/kb/en/mariadb/upgrading-from-mariadb-101-to-mariadb-102/
            https://mariadb.com/kb/en/mariadb/what-is-mariadb-102/
            https://mariadb.com/kb/en/mariadb/mariadb-1026-release-notes/
            https://mariadb.com/kb/en/mariadb/auto_increment
            https://mariadb.com/kb/en/mariadb/virtual-computed-columns/
            https://mariadb.com/kb/en/mariadb/constraint/

            greenman Ian Gilfillan added a comment - Documented in: https://mariadb.com/kb/en/mariadb/upgrading-from-mariadb-101-to-mariadb-102/ https://mariadb.com/kb/en/mariadb/what-is-mariadb-102/ https://mariadb.com/kb/en/mariadb/mariadb-1026-release-notes/ https://mariadb.com/kb/en/mariadb/auto_increment https://mariadb.com/kb/en/mariadb/virtual-computed-columns/ https://mariadb.com/kb/en/mariadb/constraint/
            greenman Ian Gilfillan made changes -
            Resolution Fixed [ 1 ]
            Status Stalled [ 10000 ] Closed [ 6 ]
            Dean T Dean Trower made changes -
            Comment [ Should also be documented on the *CREATE TABLE* page, under the *DEFAULT Column Option* heading. The text currently says:

            From MariaDB 10.2.1 you can use most functions in DEFAULT. Expressions should have parentheses around them. If you use a non deterministic function in DEFAULT then all inserts to the table will be replicated in row mode. *You can even refer to earlier columns in the DEFAULT expression*:
            ...

            But there's no indication that the "earlier columns" cannot be AUTO_INCREMENT. ]
            serg Sergei Golubchik made changes -
            Workflow MariaDB v3 [ 81665 ] MariaDB v4 [ 152485 ]

            People

              greenman Ian Gilfillan
              honso Taylor Honsowetz
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                Updated:
                Resolved:

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