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  1. MariaDB Server
  2. MDEV-17038

ALTER TABLE CHANGE COLUMN c1 c1 bigint NOT NULL - generates error if table uses SYSTEM VERSIONING

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    Description

      If you issue an ALTER TABLE to make a column that is a foreign key NOT NULL you get the following error:

      Cannot change column 'c1': used in a foreign key constraint 'p2c_ibfk_1'

      In prior versions of MariaDB this was allowed and did not generate an error. Further, if you issue an ALTER TABLE to make a column that is a foreign key NULLable you do NOT get any error message.

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          relates to

          Bug - A problem which impairs or prevents the functions of the product. MDEV-14632 Assertion `!((new_col->prtype ^ col->prtype) & ~256U)' failed in row_log_table_apply_convert_mrec

          • Major - Major loss of function.
          • Closed

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            alice Alice Sherepa added a comment -

            Thanks for the report! Reproducible with Innodb on MariaDB 10.3

            --source include/have_innodb.inc
            		 
            SET @@system_versioning_alter_history = 1;
            		 
             
            		 
            create table t1 (a int not null, key(a))engine=innodb with system versioning;
            		 
            create table t2 (b int, foreign key(b) references t1(a))engine=innodb with system versioning;
            		 
            alter table t2 modify column b int default null;
            		 
            drop table t2,t1;
            		 
             
            		 
            create table t1 (a int, key(a))engine=innodb with system versioning;
            		 
            create table t2 (b int, foreign key(b) references t1(a))engine=innodb with system versioning;
            		 
            alter table t2 modify column b int not null;
            		 
            drop table t2,t1;
            		 
             
            		 
            mysqltest: At line 17: query 'alter table t2 modify column b int not null' failed: 1832: Cannot change column 'b': used in a foreign key constraint 't2_ibfk_1'

            alice Alice Sherepa added a comment - Thanks for the report! Reproducible with Innodb on MariaDB 10.3 --source include/have_innodb.inc SET @@system_versioning_alter_history = 1;   create table t1 (a int not null, key(a))engine=innodb with system versioning; create table t2 (b int, foreign key(b) references t1(a))engine=innodb with system versioning; alter table t2 modify column b int default null; drop table t2,t1;   create table t1 (a int, key(a))engine=innodb with system versioning; create table t2 (b int, foreign key(b) references t1(a))engine=innodb with system versioning; alter table t2 modify column b int not null; drop table t2,t1;   mysqltest: At line 17: query 'alter table t2 modify column b int not null' failed: 1832: Cannot change column 'b': used in a foreign key constraint 't2_ibfk_1'
            marko Marko Mäkelä added a comment -

            I think that the tests need a little more work.

            marko Marko Mäkelä added a comment - I think that the tests need a little more work.

            People

              midenok Aleksey Midenkov
              rdyas Robert Dyas
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                Resolved:

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