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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
View File

@ -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;

4
mysql-test/r/check_constraint.result
View File

@ -136,10 +136,6 @@ insert into t1(c1) values(1);
ERROR 23000: CONSTRAINT `CONSTRAINT_1` failed for `test`.`t1`
insert into t1(c1) values(2);
drop table t1;
create table t1 (a int, b int, check(a>0));
alter table t1 drop column a;
ERROR 42S22: Unknown column 'a' in 'CHECK'
drop table t1;
create or replace table t1( c1 int auto_increment primary key, check( c1 > 0 or c1 is null ) );
ERROR HY000: Function or expression 'AUTO_INCREMENT' cannot be used in the CHECK clause of `c1`
create table t1 (a int check (@b in (select user from mysql.user)));

4
mysql-test/r/sp-destruct.result
View File

@ -12,7 +12,7 @@ create function bug14233_f() returns int
return 42;
create table t1 (id int);
create trigger t1_ai after insert on t1 for each row call bug14233();
alter table mysql.proc drop type;
alter table mysql.proc drop security_type;
call bug14233();
ERROR HY000: Column count of mysql.proc is wrong. Expected 20, found 19. The table is probably corrupted
create view v1 as select bug14233_f();
@ -142,7 +142,7 @@ drop database if exists mysqltest;
flush table mysql.proc;
create database mysqltest;
# Corrupt mysql.proc to make it unusable by current version of server.
alter table mysql.proc drop column type;
alter table mysql.proc drop column security_type;
# The below statement should not cause assertion failure.
drop database mysqltest;
Warnings:

2
mysql-test/r/statistics.result
View File

@ -1162,7 +1162,7 @@ test t2 idx4 1 6.2000
test t2 idx4 2 1.7222
test t2 idx4 3 1.1154
test t2 idx4 4 1.0000
ALTER TABLE t2 DROP COLUMN b;
ALTER TABLE t2 DROP COLUMN b, DROP PRIMARY KEY, ADD PRIMARY KEY(a);
SELECT * FROM mysql.index_stats ORDER BY index_name, prefix_arity, table_name;
db_name table_name index_name prefix_arity avg_frequency
test t2 idx2 1 7.0000

6
mysql-test/suite/funcs_1/datadict/is_key_column_usage.inc
View File

@ -232,12 +232,6 @@ eval $my_select;
ALTER TABLE db_datadict.t1_my_tablex ADD UNIQUE my_idx (f4,first_col);
eval $my_select;
#
# Check DROP COLUMN
eval $my_select;
ALTER TABLE db_datadict.t1_my_tablex
DROP COLUMN first_col;
eval $my_select;
#
# Check impact of DROP TABLE
SELECT table_name, column_name
FROM information_schema.key_column_usage

24
mysql-test/suite/funcs_1/r/is_key_column_usage.result
View File

@ -345,28 +345,6 @@ db_datadict my_idx db_datadict t1_my_tablex f4 1
db_datadict my_idx db_datadict t1_my_tablex first_col 2
db_datadict PRIMARY db_datadict t1_my_tablex first_col 1
db_datadict PRIMARY db_datadict t1_my_tablex f2 2
SELECT constraint_schema, constraint_name, table_schema,
table_name, column_name, ordinal_position
FROM information_schema.key_column_usage
WHERE table_name = 't1_my_tablex'
ORDER BY constraint_schema, constraint_name, table_schema,
table_name, ordinal_position;
constraint_schema constraint_name table_schema table_name column_name ordinal_position
db_datadict my_idx db_datadict t1_my_tablex f4 1
db_datadict my_idx db_datadict t1_my_tablex first_col 2
db_datadict PRIMARY db_datadict t1_my_tablex first_col 1
db_datadict PRIMARY db_datadict t1_my_tablex f2 2
ALTER TABLE db_datadict.t1_my_tablex
DROP COLUMN first_col;
SELECT constraint_schema, constraint_name, table_schema,
table_name, column_name, ordinal_position
FROM information_schema.key_column_usage
WHERE table_name = 't1_my_tablex'
ORDER BY constraint_schema, constraint_name, table_schema,
table_name, ordinal_position;
constraint_schema constraint_name table_schema table_name column_name ordinal_position
db_datadict my_idx db_datadict t1_my_tablex f4 1
db_datadict PRIMARY db_datadict t1_my_tablex f2 1
SELECT table_name, column_name
FROM information_schema.key_column_usage
WHERE table_name = 't1_my_tablex'
@ -374,6 +352,8 @@ ORDER BY table_name, column_name;
table_name column_name
t1_my_tablex f2
t1_my_tablex f4
t1_my_tablex first_col
t1_my_tablex first_col
DROP TABLE db_datadict.t1_my_tablex;
SELECT table_name, column_name
FROM information_schema.key_column_usage

2
mysql-test/suite/funcs_1/r/is_table_constraints.result
View File

@ -162,7 +162,7 @@ SELECT table_name FROM information_schema.table_constraints
WHERE table_name LIKE 't1_my_table%';
table_name
CREATE TABLE test.t1_my_table
(f1 CHAR(12), f2 TIMESTAMP, f4 BIGINT, PRIMARY KEY(f1,f2))
(f1 CHAR(12), f2 TIMESTAMP, f4 BIGINT, PRIMARY KEY(f1))
DEFAULT CHARACTER SET latin1 COLLATE latin1_swedish_ci
ENGINE = <engine_type>;
SELECT constraint_name, table_schema, table_name, constraint_type

2
mysql-test/suite/funcs_1/t/is_table_constraints.test
View File

@ -172,7 +172,7 @@ WHERE table_name LIKE 't1_my_table%';
--replace_result $engine_type <engine_type>
eval
CREATE TABLE test.t1_my_table
(f1 CHAR(12), f2 TIMESTAMP, f4 BIGINT, PRIMARY KEY(f1,f2))
(f1 CHAR(12), f2 TIMESTAMP, f4 BIGINT, PRIMARY KEY(f1))
DEFAULT CHARACTER SET latin1 COLLATE latin1_swedish_ci
ENGINE = $engine_type;
# Settings used in CREATE TABLE must be visible

18
mysql-test/suite/gcol/inc/gcol_keys.inc
View File

@ -322,24 +322,6 @@ ALTER TABLE t1 add unique index idx(pk);
DESC t1;
DROP TABLE t1;
--echo #
--echo # Bug#21346132: WL8149:INNODB: FAILING ASSERTION:
--echo # PRIMARY_KEY_NO == -1 || PRIMARY_KEY_NO == 0
--echo #
CREATE TABLE t1 (
col_int_nokey int(11) NOT NULL,
col_int_key int(11) GENERATED ALWAYS AS (col_int_nokey),
col_varchar_nokey varchar(1) NOT NULL,
col_varchar_key varchar(2) GENERATED ALWAYS AS (col_varchar_nokey),
UNIQUE KEY col_int_key (col_int_key),
UNIQUE KEY col_varchar_key (col_varchar_key),
UNIQUE KEY col_int_key_2 (col_int_key,col_varchar_key),
UNIQUE KEY col_varchar_key_2 (col_varchar_key,col_varchar_nokey),
KEY col_int_key_3 (col_int_key,col_int_nokey)
);
ALTER TABLE t1 DROP COLUMN col_varchar_key;
DROP TABLE t1;
--echo #
--echo # Bug#21320151 WL8149: WRONG RESULT WITH INDEX SCAN
--echo #

17
mysql-test/suite/gcol/r/gcol_keys_myisam.result
View File

@ -303,23 +303,6 @@ col_int_nokey int(11) YES NULL
col_int_key int(11) YES UNI NULL VIRTUAL GENERATED
DROP TABLE t1;
#
# Bug#21346132: WL8149:INNODB: FAILING ASSERTION:
# PRIMARY_KEY_NO == -1 || PRIMARY_KEY_NO == 0
#
CREATE TABLE t1 (
col_int_nokey int(11) NOT NULL,
col_int_key int(11) GENERATED ALWAYS AS (col_int_nokey),
col_varchar_nokey varchar(1) NOT NULL,
col_varchar_key varchar(2) GENERATED ALWAYS AS (col_varchar_nokey),
UNIQUE KEY col_int_key (col_int_key),
UNIQUE KEY col_varchar_key (col_varchar_key),
UNIQUE KEY col_int_key_2 (col_int_key,col_varchar_key),
UNIQUE KEY col_varchar_key_2 (col_varchar_key,col_varchar_nokey),
KEY col_int_key_3 (col_int_key,col_int_nokey)
);
ALTER TABLE t1 DROP COLUMN col_varchar_key;
DROP TABLE t1;
#
# Bug#21320151 WL8149: WRONG RESULT WITH INDEX SCAN
#
CREATE TABLE t1 (

75
mysql-test/suite/gcol/r/innodb_virtual_basic.result
View File

@ -930,81 +930,6 @@ create index idx on t(c);
Warnings:
Warning 1365 Division by 0
DROP TABLE t;
CREATE TABLE t (
pk INTEGER AUTO_INCREMENT,
col_int_nokey INTEGER /*! NULL */,
col_int INT GENERATED ALWAYS AS (col_int_nokey + col_int_nokey) STORED,
col_int_key INTEGER GENERATED ALWAYS AS (col_int + col_int_nokey) VIRTUAL,
col_date_nokey DATE /*! NULL */,
col_date DATE GENERATED ALWAYS AS (DATE_ADD(col_date_nokey,interval 30 day)) STORED,
col_date_key DATE GENERATED ALWAYS AS (DATE_ADD(col_date,interval 30 day)) VIRTUAL,
col_datetime_nokey DATETIME /*! NULL */,
col_time_nokey TIME /*! NULL */,
col_datetime DATETIME GENERATED ALWAYS AS (ADDTIME(col_datetime_nokey, col_time_nokey)) STORED,
col_time TIME GENERATED ALWAYS AS (ADDTIME(col_datetime_nokey, col_time_nokey)) STORED,
col_datetime_key DATETIME GENERATED ALWAYS AS (ADDTIME(col_datetime, col_time_nokey)) VIRTUAL,
col_time_key TIME GENERATED ALWAYS AS (ADDTIME(col_datetime_nokey, col_time)) VIRTUAL,
col_varchar_nokey VARCHAR(1) /*! NULL */,
col_varchar VARCHAR(2) GENERATED ALWAYS AS (CONCAT(col_varchar_nokey,col_varchar_nokey)) STORED,
col_varchar_key VARCHAR(2) GENERATED ALWAYS AS (CONCAT(col_varchar, 'x')) VIRTUAL,
unique KEY (pk,col_int_key),
KEY(col_int),
KEY(col_date),
KEY(col_datetime),
KEY(col_time),
KEY(col_varchar),
UNIQUE KEY (col_int_key),
KEY (col_time_key),
KEY (col_datetime_key),
UNIQUE KEY (col_int_key, col_varchar_key),
KEY (col_int_key, col_int_nokey),
KEY(col_int_key,col_date_key),
KEY(col_int_key, col_time_key),
KEY(col_int_key, col_datetime_key),
KEY(col_date_key,col_time_key,col_datetime_key),
KEY (col_varchar_key, col_varchar_nokey),
UNIQUE KEY (col_int_key, col_varchar_key, col_date_key, col_time_key, col_datetime_key)
) AUTO_INCREMENT=10 ENGINE=INNODB PARTITION BY KEY(col_int_key) PARTITIONS 3;
ALTER TABLE t DROP COLUMN `pk`;
SHOW CREATE TABLE t;
Table Create Table
t CREATE TABLE `t` (
`col_int_nokey` int(11) DEFAULT NULL,
`col_int` int(11) GENERATED ALWAYS AS (`col_int_nokey` + `col_int_nokey`) STORED,
`col_int_key` int(11) GENERATED ALWAYS AS (`col_int` + `col_int_nokey`) VIRTUAL,
`col_date_nokey` date DEFAULT NULL,
`col_date` date GENERATED ALWAYS AS (`col_date_nokey` + interval 30 day) STORED,
`col_date_key` date GENERATED ALWAYS AS (`col_date` + interval 30 day) VIRTUAL,
`col_datetime_nokey` datetime DEFAULT NULL,
`col_time_nokey` time DEFAULT NULL,
`col_datetime` datetime GENERATED ALWAYS AS (addtime(`col_datetime_nokey`,`col_time_nokey`)) STORED,
`col_time` time GENERATED ALWAYS AS (addtime(`col_datetime_nokey`,`col_time_nokey`)) STORED,
`col_datetime_key` datetime GENERATED ALWAYS AS (addtime(`col_datetime`,`col_time_nokey`)) VIRTUAL,
`col_time_key` time GENERATED ALWAYS AS (addtime(`col_datetime_nokey`,`col_time`)) VIRTUAL,
`col_varchar_nokey` varchar(1) DEFAULT NULL,
`col_varchar` varchar(2) GENERATED ALWAYS AS (concat(`col_varchar_nokey`,`col_varchar_nokey`)) STORED,
`col_varchar_key` varchar(2) GENERATED ALWAYS AS (concat(`col_varchar`,'x')) VIRTUAL,
UNIQUE KEY `pk` (`col_int_key`),
UNIQUE KEY `col_int_key` (`col_int_key`),
UNIQUE KEY `col_int_key_2` (`col_int_key`,`col_varchar_key`),
UNIQUE KEY `col_int_key_7` (`col_int_key`,`col_varchar_key`,`col_date_key`,`col_time_key`,`col_datetime_key`),
KEY `col_int` (`col_int`),
KEY `col_date` (`col_date`),
KEY `col_datetime` (`col_datetime`),
KEY `col_time` (`col_time`),
KEY `col_varchar` (`col_varchar`),
KEY `col_time_key` (`col_time_key`),
KEY `col_datetime_key` (`col_datetime_key`),
KEY `col_int_key_3` (`col_int_key`,`col_int_nokey`),
KEY `col_int_key_4` (`col_int_key`,`col_date_key`),
KEY `col_int_key_5` (`col_int_key`,`col_time_key`),
KEY `col_int_key_6` (`col_int_key`,`col_datetime_key`),
KEY `col_date_key` (`col_date_key`,`col_time_key`,`col_datetime_key`),
KEY `col_varchar_key` (`col_varchar_key`,`col_varchar_nokey`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
PARTITION BY KEY (`col_int_key`)
PARTITIONS 3
DROP TABLE t;
CREATE TABLE t (a INT, b INT, c INT GENERATED ALWAYS AS(a+b), h VARCHAR(10));
INSERT INTO t VALUES (11, 3, DEFAULT, 'mm');
INSERT INTO t VALUES (18, 1, DEFAULT, 'mm');

42
mysql-test/suite/gcol/t/innodb_virtual_basic.test
View File

@ -780,48 +780,6 @@ alter table t add c INT GENERATED ALWAYS AS(a/b);
create index idx on t(c);
DROP TABLE t;
CREATE TABLE t (
pk INTEGER AUTO_INCREMENT,
col_int_nokey INTEGER /*! NULL */,
col_int INT GENERATED ALWAYS AS (col_int_nokey + col_int_nokey) STORED,
col_int_key INTEGER GENERATED ALWAYS AS (col_int + col_int_nokey) VIRTUAL,
col_date_nokey DATE /*! NULL */,
col_date DATE GENERATED ALWAYS AS (DATE_ADD(col_date_nokey,interval 30 day)) STORED,
col_date_key DATE GENERATED ALWAYS AS (DATE_ADD(col_date,interval 30 day)) VIRTUAL,
col_datetime_nokey DATETIME /*! NULL */,
col_time_nokey TIME /*! NULL */,
col_datetime DATETIME GENERATED ALWAYS AS (ADDTIME(col_datetime_nokey, col_time_nokey)) STORED,
col_time TIME GENERATED ALWAYS AS (ADDTIME(col_datetime_nokey, col_time_nokey)) STORED,
col_datetime_key DATETIME GENERATED ALWAYS AS (ADDTIME(col_datetime, col_time_nokey)) VIRTUAL,
col_time_key TIME GENERATED ALWAYS AS (ADDTIME(col_datetime_nokey, col_time)) VIRTUAL,
col_varchar_nokey VARCHAR(1) /*! NULL */,
col_varchar VARCHAR(2) GENERATED ALWAYS AS (CONCAT(col_varchar_nokey,col_varchar_nokey)) STORED,
col_varchar_key VARCHAR(2) GENERATED ALWAYS AS (CONCAT(col_varchar, 'x')) VIRTUAL,
unique KEY (pk,col_int_key),
KEY(col_int),
KEY(col_date),
KEY(col_datetime),
KEY(col_time),
KEY(col_varchar),
UNIQUE KEY (col_int_key),
KEY (col_time_key),
KEY (col_datetime_key),
UNIQUE KEY (col_int_key, col_varchar_key),
KEY (col_int_key, col_int_nokey),
KEY(col_int_key,col_date_key),
KEY(col_int_key, col_time_key),
KEY(col_int_key, col_datetime_key),
KEY(col_date_key,col_time_key,col_datetime_key),
KEY (col_varchar_key, col_varchar_nokey),
UNIQUE KEY (col_int_key, col_varchar_key, col_date_key, col_time_key, col_datetime_key)
) AUTO_INCREMENT=10 ENGINE=INNODB PARTITION BY KEY(col_int_key) PARTITIONS 3;
ALTER TABLE t DROP COLUMN `pk`;
SHOW CREATE TABLE t;
DROP TABLE t;
CREATE TABLE t (a INT, b INT, c INT GENERATED ALWAYS AS(a+b), h VARCHAR(10));
INSERT INTO t VALUES (11, 3, DEFAULT, 'mm');

32
mysql-test/t/alter_table.test
View File

@ -1801,3 +1801,35 @@ DROP TABLE t1;
--error ER_DUP_CONSTRAINT_NAME
CREATE TABLE t1(a INT, b INT, CONSTRAINT min check (a>5),
CONSTRAINT min check (b>5));
#
# MDEV-11114 Cannot drop column referenced by CHECK constraint
#
create table t1 (a int, b int, check(a>b));
--error ER_BAD_FIELD_ERROR
alter table t1 drop column a;
--error ER_BAD_FIELD_ERROR
alter table t1 drop column b, add column b bigint first;
show create table t1;
drop table t1;
create table t1 (a int, b int, check(a>0));
alter table t1 drop column a;
show create table t1;
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;
drop table t1;
create table t1 (a int, b int, c int, unique(a));
alter table t1 drop column a;
show create table t1;
drop table t1;
create table t1 (a int, b int, c int, unique(a,b));
--error ER_KEY_COLUMN_DOES_NOT_EXITS
alter table t1 drop column a;
show create table t1;
drop table t1;

8
mysql-test/t/check_constraint.test
View File

@ -79,14 +79,6 @@ insert into t1(c1) values(1);
insert into t1(c1) values(2);
drop table t1;
#
# MDEV-11114 Cannot drop column referenced by CHECK constraint: Unknown column 'a' in 'virtual column function'
#
create table t1 (a int, b int, check(a>0));
--error ER_BAD_FIELD_ERROR
alter table t1 drop column a;
drop table t1;
#
# MDEV-11117 CHECK constraint fails on intermediate step of ALTER
#

4
mysql-test/t/sp-destruct.test
View File

@ -39,7 +39,7 @@ create table t1 (id int);
create trigger t1_ai after insert on t1 for each row call bug14233();
# Unsupported tampering with the mysql.proc definition
alter table mysql.proc drop type;
alter table mysql.proc drop security_type;
--error ER_COL_COUNT_DOESNT_MATCH_CORRUPTED_V2
call bug14233();
--error ER_COL_COUNT_DOESNT_MATCH_CORRUPTED_V2
@ -238,7 +238,7 @@ let $MYSQLD_DATADIR= `select @@datadir`;
create database mysqltest;
--echo # Corrupt mysql.proc to make it unusable by current version of server.
alter table mysql.proc drop column type;
alter table mysql.proc drop column security_type;
--echo # The below statement should not cause assertion failure.
drop database mysqltest;

2
mysql-test/t/statistics.test
View File

@ -500,7 +500,7 @@ SELECT * FROM mysql.index_stats ORDER BY index_name, prefix_arity, table_name;
ANALYZE TABLE t2 PERSISTENT FOR COLUMNS ALL INDEXES ALL;
SELECT * FROM mysql.index_stats ORDER BY index_name, prefix_arity, table_name;
ALTER TABLE t2 DROP COLUMN b;
ALTER TABLE t2 DROP COLUMN b, DROP PRIMARY KEY, ADD PRIMARY KEY(a);
SELECT * FROM mysql.index_stats ORDER BY index_name, prefix_arity, table_name;
ANALYZE TABLE t2 PERSISTENT FOR COLUMNS() INDEXES ALL;

28
sql/sql_table.cc
View File

@ -7549,6 +7549,7 @@ mysql_prepare_alter_table(THD *thd, TABLE *table,
bool modified_primary_key= FALSE;
Create_field *def;
Field **f_ptr,*field;
MY_BITMAP *dropped_fields= NULL; // if it's NULL - no dropped fields
DBUG_ENTER("mysql_prepare_alter_table");
/*
@ -7605,6 +7606,7 @@ mysql_prepare_alter_table(THD *thd, TABLE *table,
/*
First collect all fields from table which isn't in drop_list
*/
bitmap_clear_all(&table->tmp_set);
for (f_ptr=table->field ; (field= *f_ptr) ; f_ptr++)
{
Alter_drop *drop;
@ -7630,6 +7632,8 @@ mysql_prepare_alter_table(THD *thd, TABLE *table,
if (table->s->tmp_table == NO_TMP_TABLE)
(void) delete_statistics_for_column(thd, table, field);
drop_it.remove();
dropped_fields= &table->tmp_set;
bitmap_set_bit(dropped_fields, field->field_index);
continue;
}
/* Check if field is changed */
@ -7816,6 +7820,7 @@ mysql_prepare_alter_table(THD *thd, TABLE *table,
continue;
}
const char *dropped_key_part= NULL;
KEY_PART_INFO *key_part= key_info->key_part;
key_parts.empty();
bool delete_index_stat= FALSE;
@ -7845,6 +7850,7 @@ mysql_prepare_alter_table(THD *thd, TABLE *table,
if (table->s->primary_key == i)
modified_primary_key= TRUE;
delete_index_stat= TRUE;
dropped_key_part= key_part_name;
continue; // Field is removed
}
key_part_length= key_part->length;
@ -7927,6 +7933,11 @@ mysql_prepare_alter_table(THD *thd, TABLE *table,
key_type= Key::PRIMARY;
else
key_type= Key::UNIQUE;
if (dropped_key_part)
{
my_error(ER_KEY_COLUMN_DOES_NOT_EXITS, MYF(0), dropped_key_part);
goto err;
}
}
else if (key_info->flags & HA_FULLTEXT)
key_type= Key::FULLTEXT;
@ -7977,6 +7988,23 @@ mysql_prepare_alter_table(THD *thd, TABLE *table,
break;
}
}
/* see if the constraint depends on *only* on dropped fields */
if (dropped_fields)
{
table->default_column_bitmaps();
bitmap_clear_all(table->read_set);
check->expr->walk(&Item::register_field_in_read_map, 1, 0);
if (bitmap_is_subset(table->read_set, dropped_fields))
drop= (Alter_drop*)1;
else if (bitmap_is_overlapping(dropped_fields, table->read_set))
{
bitmap_intersect(table->read_set, dropped_fields);
uint field_nr= bitmap_get_first_set(table->read_set);
my_error(ER_BAD_FIELD_ERROR, MYF(0),
table->field[field_nr]->field_name, "CHECK");
goto err;
}
}
if (!drop)
new_constraint_list.push_back(check, thd->mem_root);
}