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  1. MariaDB Server
  2. MDEV-13508

ALTER TABLE that renames columns and CHECK constraints

Details

    Description

      If a column is renamed, CHECK constraint isn't changed to use the new column name. But UNIQUE constraint is.

      create table t1 (a int, b int, check(a>b));
      		 
      alter table t1 change column a b int, change column b a int;
      		 
      show create table t1;

      Compare with

      create table t1 (a int, b int, unique(a,b));
      		 
      alter table t1 change column a b int, change column b a int;
      		 
      show create table t1;

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        Issue Links

          is duplicated by

          Bug - A problem which impairs or prevents the functions of the product. MDEV-16161 Syntax error reserverd keyword

          • Major - Major loss of function.
          • Closed
          relates to

          Bug - A problem which impairs or prevents the functions of the product. MDEV-11114 Cannot drop column referenced by CHECK constraint

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-22881 Unexpected errors, corrupt output, Valgrind / ASAN errors in Item_ident::print or append_identifier

          • Critical - Crashes, loss of data, severe memory leak.
          • Closed

          Activity

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            zzzeek Mike Bayer added a comment -

            note also as in MDEV-11114 this prevents the column from being renamed in most cases:

            MariaDB [test]> create table t1 (a int, check (a in (0, 1)));
            Query OK, 0 rows affected (0.03 sec)

            MariaDB [test]> alter table t1 change column a b int;
            ERROR 1054 (42S22): Unknown column 'a' in 'CHECK'

            zzzeek Mike Bayer added a comment - note also as in MDEV-11114 this prevents the column from being renamed in most cases: MariaDB [test] > create table t1 (a int, check (a in (0, 1))); Query OK, 0 rows affected (0.03 sec) MariaDB [test] > alter table t1 change column a b int; ERROR 1054 (42S22): Unknown column 'a' in 'CHECK'
            monty Michael Widenius added a comment -

            Fixed by adding Item::rename_fields_processor and use this to rename fields in
            virtual columns, check constraint and default values

            monty Michael Widenius added a comment - Fixed by adding Item::rename_fields_processor and use this to rename fields in virtual columns, check constraint and default values

            People

              monty Michael Widenius
              serg Sergei Golubchik
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              Dates

                Created:
                Updated:
                Resolved:

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