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MDEV-11114 Cannot drop column referenced by CHECK constraint

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SQL Standard behavior for DROP COLUMN xxx RESTRICT:
* If a constraint (UNIQUE or CHECK) uses only the dropped column,
  it's automatically dropped too. If it uses many columns - an error.
This commit is contained in:
Sergei Golubchik
2017-08-12 18:52:38 +02:00
parent 28ddc9b3bb
commit 04b288ae47
17 changed files with 121 additions and 200 deletions
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51
mysql-test/r/alter_table.result
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@ -2171,3 +2171,54 @@ DROP TABLE t1;
CREATE TABLE t1(a INT, b INT, CONSTRAINT min check (a>5),
CONSTRAINT min check (b>5));
ERROR HY000: Duplicate CHECK constraint name 'min'
create table t1 (a int, b int, check(a>b));
alter table t1 drop column a;
ERROR 42S22: Unknown column 'a' in 'CHECK'
alter table t1 drop column b, add column b bigint first;
ERROR 42S22: Unknown column 'b' in 'CHECK'
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`a` int(11) DEFAULT NULL,
`b` int(11) DEFAULT NULL,
CONSTRAINT `CONSTRAINT_1` CHECK (`a` > `b`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1
drop table t1;
create table t1 (a int, b int, check(a>0));
alter table t1 drop column a;
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`b` int(11) DEFAULT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1
drop table t1;
create table t1 (a int, b int, check(a>0));
alter table t1 drop column a, add column a bigint first;
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`a` bigint(20) DEFAULT NULL,
`b` int(11) DEFAULT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1
drop table t1;
create table t1 (a int, b int, c int, unique(a));
alter table t1 drop column a;
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`b` int(11) DEFAULT NULL,
`c` int(11) DEFAULT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1
drop table t1;
create table t1 (a int, b int, c int, unique(a,b));
alter table t1 drop column a;
ERROR 42000: Key column 'a' doesn't exist in table
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`a` int(11) DEFAULT NULL,
`b` int(11) DEFAULT NULL,
`c` int(11) DEFAULT NULL,
UNIQUE KEY `a` (`a`,`b`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1
drop table t1;