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Bug#24666169: I_S.TABLE_CONSTRAINTS.CONSTRAINT_NAME IS NOT UPDATED
 AFTER RENAME TABLE Bug#25339192: NEWDD: SERVER SHOULD DISALLOW FOREIGN KEYS ON BASE COLUMN OF STORED COLUMN This patch consists of three parts: 1) When tables are renamed, any foreign keys with generated names are renamed as well. This is necessary since the table name is part of the generated name. We assume that the name was generated if it starts with table_name + '_ibfk_', similar to how InnoDB does it in earlier versions. This part fixes Bug#24666169. 2) During ALTER TABLE, both the new and the old table definition exists in the data dictionary at the same time (uncommitted). In order to satisfy the unique constraint on schema_name+fk_name, pre-existing FKs were before not transferred to the new table definition until ALTER TABLE was almost completed. This meant that FK metadata was not available to InnoDB during ALTER TABLE processing. In order to make it available to InnoDB, foreign keys are now transferred to the new table definintion immediately, but with a temporary name to satisfy the unique constraint. The original name is restored at the end of ALTER TABLE. This part is required to fix Bug#25339192. 3) As a consequence of 2), more validity checking of pre-existing foreign keys had been added to the SQL layer to avoid regressions in error reporting. This consists of checking and reporting ER_FK_DUP_NAME, ER_DROP_INDEX_FK and ER_FK_COLUMN_CANNOT_DROP.
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‎mysql-test/r/foreign_key.result

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@@ -160,3 +160,362 @@ CREATE TABLE t1(a INT PRIMARY KEY, b INT,
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FOREIGN KEY(b) REFERENCES t2(name5678901234567890123456789012345678901234567890123456789012345));
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ERROR 42000: Incorrect column name 'name5678901234567890123456789012345678901234567890123456789012345'
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SET @@foreign_key_checks= DEFAULT;
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#
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# Bug#24666169: I_S.TABLE_CONSTRAINTS.CONSTRAINT_NAME IS NOT UPDATED
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# AFTER RENAME TABLE
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#
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SET @@foreign_key_checks= 1;
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#
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# Tests for FK name behavior.
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CREATE TABLE t1(c1 INT PRIMARY KEY);
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CREATE TABLE t2(c1 INT, FOREIGN KEY (c1) REFERENCES t1(c1));
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ALTER TABLE t2 RENAME TO t3;
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SHOW CREATE TABLE t3;
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Table Create Table
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t3 CREATE TABLE `t3` (
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`c1` int(11) DEFAULT NULL,
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KEY `c1` (`c1`),
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CONSTRAINT `t3_ibfk_1` FOREIGN KEY (`c1`) REFERENCES `t1` (`c1`)
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) ENGINE=InnoDB DEFAULT CHARSET=latin1
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INSERT INTO t3 VALUES(1);
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ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`t3`, CONSTRAINT `t3_ibfk_1` FOREIGN KEY (`c1`) REFERENCES `t1` (`c1`))
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ALTER TABLE t3 RENAME TO t4, ALGORITHM= INPLACE;
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SHOW CREATE TABLE t4;
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Table Create Table
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t4 CREATE TABLE `t4` (
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`c1` int(11) DEFAULT NULL,
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KEY `c1` (`c1`),
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CONSTRAINT `t4_ibfk_1` FOREIGN KEY (`c1`) REFERENCES `t1` (`c1`)
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) ENGINE=InnoDB DEFAULT CHARSET=latin1
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INSERT INTO t4 VALUES(1);
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ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`t4`, CONSTRAINT `t4_ibfk_1` FOREIGN KEY (`c1`) REFERENCES `t1` (`c1`))
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ALTER TABLE t4 RENAME TO t5;
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SHOW CREATE TABLE t5;
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Table Create Table
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t5 CREATE TABLE `t5` (
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`c1` int(11) DEFAULT NULL,
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KEY `c1` (`c1`),
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CONSTRAINT `t5_ibfk_1` FOREIGN KEY (`c1`) REFERENCES `t1` (`c1`)
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) ENGINE=InnoDB DEFAULT CHARSET=latin1
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INSERT INTO t5 VALUES(1);
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ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`t5`, CONSTRAINT `t5_ibfk_1` FOREIGN KEY (`c1`) REFERENCES `t1` (`c1`))
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RENAME TABLE t5 to t6;
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SHOW CREATE TABLE t6;
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Table Create Table
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t6 CREATE TABLE `t6` (
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`c1` int(11) DEFAULT NULL,
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KEY `c1` (`c1`),
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CONSTRAINT `t6_ibfk_1` FOREIGN KEY (`c1`) REFERENCES `t1` (`c1`)
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) ENGINE=InnoDB DEFAULT CHARSET=latin1
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INSERT INTO t6 VALUES(1);
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ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`t6`, CONSTRAINT `t6_ibfk_1` FOREIGN KEY (`c1`) REFERENCES `t1` (`c1`))
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DROP TABLE t6, t1;
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#
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# Tests of FK name generation
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CREATE TABLE t1(a INT PRIMARY KEY);
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CREATE TABLE t2(a INT, b INT, FOREIGN KEY(a) REFERENCES t1(a));
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SELECT constraint_name FROM information_schema.referential_constraints
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WHERE table_name = 't2' ORDER BY constraint_name;
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constraint_name
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t2_ibfk_1
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SELECT constraint_name FROM information_schema.table_constraints
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WHERE table_name = 't2' ORDER BY constraint_name;
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constraint_name
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t2_ibfk_1
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# Add FK
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ALTER TABLE t2 ADD FOREIGN KEY(b) REFERENCES t1(a);
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SELECT constraint_name FROM information_schema.referential_constraints
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WHERE table_name = 't2' ORDER BY constraint_name;
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constraint_name
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t2_ibfk_1
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t2_ibfk_2
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SELECT constraint_name FROM information_schema.table_constraints
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WHERE table_name = 't2' ORDER BY constraint_name;
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constraint_name
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t2_ibfk_1
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t2_ibfk_2
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# Remove first FK and add a new FK.
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ALTER TABLE t2 DROP FOREIGN KEY t2_ibfk_1;
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ALTER TABLE t2 ADD FOREIGN KEY(a) REFERENCES t1(a);
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SELECT constraint_name FROM information_schema.referential_constraints
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WHERE table_name = 't2' ORDER BY constraint_name;
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constraint_name
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t2_ibfk_2
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t2_ibfk_3
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SELECT constraint_name FROM information_schema.table_constraints
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WHERE table_name = 't2' ORDER BY constraint_name;
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constraint_name
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t2_ibfk_2
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t2_ibfk_3
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# Rename table in different ways.
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ALTER TABLE t2 RENAME TO t3;
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SELECT constraint_name FROM information_schema.referential_constraints
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WHERE table_name = 't3' ORDER BY constraint_name;
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constraint_name
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t3_ibfk_2
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t3_ibfk_3
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SELECT constraint_name FROM information_schema.table_constraints
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WHERE table_name = 't3' ORDER BY constraint_name;
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constraint_name
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t3_ibfk_2
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t3_ibfk_3
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ALTER TABLE t3 RENAME TO t4, ALGORITHM= INPLACE;
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SELECT constraint_name FROM information_schema.referential_constraints
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WHERE table_name = 't4' ORDER BY constraint_name;
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constraint_name
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t4_ibfk_2
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t4_ibfk_3
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SELECT constraint_name FROM information_schema.table_constraints
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WHERE table_name = 't4' ORDER BY constraint_name;
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constraint_name
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t4_ibfk_2
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t4_ibfk_3
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ALTER TABLE t4 RENAME TO t5;
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SELECT constraint_name FROM information_schema.referential_constraints
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WHERE table_name = 't5' ORDER BY constraint_name;
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constraint_name
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t5_ibfk_2
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t5_ibfk_3
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SELECT constraint_name FROM information_schema.table_constraints
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WHERE table_name = 't5' ORDER BY constraint_name;
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constraint_name
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t5_ibfk_2
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t5_ibfk_3
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RENAME TABLE t5 TO t6;
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SELECT constraint_name FROM information_schema.referential_constraints
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WHERE table_name = 't6' ORDER BY constraint_name;
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constraint_name
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t6_ibfk_2
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t6_ibfk_3
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SELECT constraint_name FROM information_schema.table_constraints
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WHERE table_name = 't6' ORDER BY constraint_name;
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constraint_name
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t6_ibfk_2
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t6_ibfk_3
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# Simulate dump+restore and test rename
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DROP TABLE t6;
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CREATE TABLE `t6` (
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`a` int(11) DEFAULT NULL,
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`b` int(11) DEFAULT NULL,
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KEY `b` (`b`),
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KEY `a` (`a`),
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CONSTRAINT `t6_ibfk_2` FOREIGN KEY (`b`) REFERENCES `t1` (`a`),
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CONSTRAINT `t6_ibfk_3` FOREIGN KEY (`a`) REFERENCES `t1` (`a`)
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) ENGINE=InnoDB DEFAULT CHARSET=latin1;
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SELECT constraint_name FROM information_schema.referential_constraints
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WHERE table_name = 't6' ORDER BY constraint_name;
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constraint_name
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t6_ibfk_2
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t6_ibfk_3
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SELECT constraint_name FROM information_schema.table_constraints
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WHERE table_name = 't6' ORDER BY constraint_name;
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constraint_name
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t6_ibfk_2
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t6_ibfk_3
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RENAME TABLE t6 TO t2;
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SELECT constraint_name FROM information_schema.referential_constraints
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WHERE table_name = 't2' ORDER BY constraint_name;
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constraint_name
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t2_ibfk_2
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t2_ibfk_3
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SELECT constraint_name FROM information_schema.table_constraints
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WHERE table_name = 't2' ORDER BY constraint_name;
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constraint_name
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t2_ibfk_2
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t2_ibfk_3
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# Remove all FKs and add one back
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ALTER TABLE t2 DROP FOREIGN KEY t2_ibfk_2, DROP FOREIGN KEY t2_ibfk_3;
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ALTER TABLE t2 ADD FOREIGN KEY(a) REFERENCES t1(a);
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SELECT constraint_name FROM information_schema.referential_constraints
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WHERE table_name = 't2' ORDER BY constraint_name;
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constraint_name
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t2_ibfk_1
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SELECT constraint_name FROM information_schema.table_constraints
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WHERE table_name = 't2' ORDER BY constraint_name;
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constraint_name
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t2_ibfk_1
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# Add a foreign key with close to generated name
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ALTER TABLE t2 ADD CONSTRAINT t3_ibfk_2 FOREIGN KEY(b) REFERENCES t1(a);
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SELECT constraint_name FROM information_schema.referential_constraints
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WHERE table_name = 't2' ORDER BY constraint_name;
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constraint_name
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t2_ibfk_1
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t3_ibfk_2
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SELECT constraint_name FROM information_schema.table_constraints
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WHERE table_name = 't2' ORDER BY constraint_name;
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constraint_name
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t2_ibfk_1
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t3_ibfk_2
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# Then rename so that the given name now matches a generated name
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RENAME TABLE t2 TO t3;
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SELECT constraint_name FROM information_schema.referential_constraints
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WHERE table_name = 't3' ORDER BY constraint_name;
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constraint_name
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t3_ibfk_1
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t3_ibfk_2
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SELECT constraint_name FROM information_schema.table_constraints
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WHERE table_name = 't3' ORDER BY constraint_name;
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constraint_name
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t3_ibfk_1
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t3_ibfk_2
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# Finally rename it again. The given name is now seen as generated and renamed.
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RENAME TABLE t3 TO t4;
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SELECT constraint_name FROM information_schema.referential_constraints
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WHERE table_name = 't4' ORDER BY constraint_name;
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constraint_name
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t4_ibfk_1
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t4_ibfk_2
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SELECT constraint_name FROM information_schema.table_constraints
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WHERE table_name = 't4' ORDER BY constraint_name;
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constraint_name
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t4_ibfk_1
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t4_ibfk_2
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DROP TABLE t4;
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# Make a foreign key with given name matching a generated name
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CREATE TABLE t2(a INT, b INT);
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ALTER TABLE t2 ADD CONSTRAINT t2_ibfk_1 FOREIGN KEY(a) REFERENCES t1(a);
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ALTER TABLE t2 ADD FOREIGN KEY(b) REFERENCES t1(a);
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SELECT constraint_name FROM information_schema.referential_constraints
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WHERE table_name = 't2' ORDER BY constraint_name;
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constraint_name
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t2_ibfk_1
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t2_ibfk_2
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SELECT constraint_name FROM information_schema.table_constraints
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WHERE table_name = 't2' ORDER BY constraint_name;
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constraint_name
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t2_ibfk_1
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t2_ibfk_2
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DROP TABLE t2;
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# Test FK name case sensitivity
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CREATE TABLE t2(a INT, b INT);
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ALTER TABLE t2 ADD CONSTRAINT FK FOREIGN KEY(a) REFERENCES t1(a);
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SELECT constraint_name FROM information_schema.referential_constraints
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WHERE table_name = 't2' ORDER BY constraint_name;
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constraint_name
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FK
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SELECT constraint_name FROM information_schema.table_constraints
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WHERE table_name = 't2' ORDER BY constraint_name;
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constraint_name
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FK
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ALTER TABLE t2 ADD CONSTRAINT fk FOREIGN KEY(b) REFERENCES t1(a);
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ERROR 42000: Duplicate key name 'fk'
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ALTER TABLE t2 DROP FOREIGN KEY FK;
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# Name matching generated name, but different case.
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ALTER TABLE t2 ADD CONSTRAINT T2_IBFK_1 FOREIGN KEY(a) REFERENCES t1(a);
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ALTER TABLE t2 ADD FOREIGN KEY(b) REFERENCES t1(a);
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ERROR HY000: Duplicate foreign key constraint name 't2_ibfk_1'
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ALTER TABLE t2 DROP FOREIGN KEY T2_IBFK_1;
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DROP TABLE t2;
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# Check long FK generated names due to long table names.
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CREATE TABLE t2 (a INT, FOREIGN KEY (a) REFERENCES t1(a));
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RENAME TABLE t2 TO t123456789012345678901234567890123456789012345678901234567;
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ERROR 42000: Identifier name 't123456789012345678901234567890123456789012345678901234567_ibfk_1' is too long
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RENAME TABLE t2 TO t12345678901234567890123456789012345678901234567890123456;
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SELECT constraint_name FROM information_schema.referential_constraints
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WHERE table_name = 't12345678901234567890123456789012345678901234567890123456'
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ORDER BY constraint_name;
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constraint_name
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t12345678901234567890123456789012345678901234567890123456_ibfk_1
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SELECT constraint_name FROM information_schema.table_constraints
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WHERE table_name = 't12345678901234567890123456789012345678901234567890123456'
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ORDER BY constraint_name;
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constraint_name
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t12345678901234567890123456789012345678901234567890123456_ibfk_1
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DROP TABLE t12345678901234567890123456789012345678901234567890123456;
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CREATE TABLE t123456789012345678901234567890123456789012345678901234567(
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a INT, FOREIGN KEY (a) REFERENCES t1(a));
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ERROR 42000: Identifier name 't123456789012345678901234567890123456789012345678901234567_ibfk_1' is too long
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CREATE TABLE t123456789012345678901234567890123456789012345678901234567890123(
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a INT, CONSTRAINT fk FOREIGN KEY (a) REFERENCES t1(a));
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DROP TABLE t123456789012345678901234567890123456789012345678901234567890123;
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DROP TABLE t1;
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# FK Referencing virtual column
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CREATE TABLE t1(a INT PRIMARY KEY,
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b INT GENERATED ALWAYS AS (a+1) VIRTUAL UNIQUE);
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CREATE TABLE t2(a INT, FOREIGN KEY (a) REFERENCES t1(b));
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ERROR HY000: Cannot add foreign key constraint
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CREATE TABLE t2(a INT);
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ALTER TABLE t2 ADD FOREIGN KEY(a) REFERENCES t1(b);
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ERROR HY000: Cannot add foreign key constraint
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DROP TABLE t1, t2;
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# FK on generated stored column
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CREATE TABLE t1(a INT PRIMARY KEY);
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CREATE TABLE t2(a INT, b INT GENERATED ALWAYS AS (a+1) STORED UNIQUE);
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CREATE TABLE t3(a INT, b INT GENERATED ALWAYS AS (a+1) STORED UNIQUE,
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FOREIGN KEY (b) REFERENCES t1(a));
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ALTER TABLE t2 ADD FOREIGN KEY(b) REFERENCES t1(a);
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ALTER TABLE t2 DROP FOREIGN KEY t2_ibfk_1;
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DROP TABLE t3;
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CREATE TABLE t3(a INT, b INT GENERATED ALWAYS AS (a+1) STORED UNIQUE,
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FOREIGN KEY (b) REFERENCES t1(a) ON UPDATE CASCADE);
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ERROR HY000: Cannot define foreign key with ON UPDATE CASCADE clause on a generated column.
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ALTER TABLE t2 ADD FOREIGN KEY(b) REFERENCES t1(a) ON UPDATE CASCADE;
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ERROR HY000: Cannot define foreign key with ON UPDATE CASCADE clause on a generated column.
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CREATE TABLE t3(a INT, b INT GENERATED ALWAYS AS (a+1) STORED UNIQUE,
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FOREIGN KEY (b) REFERENCES t1(a) ON DELETE SET NULL);
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ERROR HY000: Cannot define foreign key with ON DELETE SET NULL clause on a generated column.
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ALTER TABLE t2 ADD FOREIGN KEY(b) REFERENCES t1(a) ON DELETE SET NULL;
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ERROR HY000: Cannot define foreign key with ON DELETE SET NULL clause on a generated column.
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CREATE TABLE t3(a INT, b INT GENERATED ALWAYS AS (a+1) STORED UNIQUE,
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FOREIGN KEY (b) REFERENCES t1(a) ON UPDATE SET NULL);
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ERROR HY000: Cannot define foreign key with ON UPDATE SET NULL clause on a generated column.
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ALTER TABLE t2 ADD FOREIGN KEY(b) REFERENCES t1(a) ON UPDATE SET NULL;
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ERROR HY000: Cannot define foreign key with ON UPDATE SET NULL clause on a generated column.
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# FK on Base column of generated stored column.
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CREATE TABLE t3(a INT, b INT GENERATED ALWAYS AS (a+1) STORED UNIQUE,
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FOREIGN KEY (a) REFERENCES t1(a));
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ALTER TABLE t2 ADD FOREIGN KEY(a) REFERENCES t1(a);
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ALTER TABLE t2 DROP FOREIGN KEY t2_ibfk_1;
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DROP TABLE t3;
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CREATE TABLE t3(a INT, b INT GENERATED ALWAYS AS (a+1) STORED UNIQUE,
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FOREIGN KEY (a) REFERENCES t1(a) ON UPDATE CASCADE);
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ERROR HY000: Cannot add foreign key constraint
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ALTER TABLE t2 ADD FOREIGN KEY(a) REFERENCES t1(a) ON UPDATE CASCADE;
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ERROR HY000: Cannot add foreign key constraint
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CREATE TABLE t3(a INT, b INT GENERATED ALWAYS AS (a+1) STORED UNIQUE,
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FOREIGN KEY (a) REFERENCES t1(a) ON DELETE SET NULL);
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ERROR HY000: Cannot add foreign key constraint
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ALTER TABLE t2 ADD FOREIGN KEY(a) REFERENCES t1(a) ON DELETE SET NULL;
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ERROR HY000: Cannot add foreign key constraint
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CREATE TABLE t3(a INT, b INT GENERATED ALWAYS AS (a+1) STORED UNIQUE,
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FOREIGN KEY (a) REFERENCES t1(a) ON UPDATE SET NULL);
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ERROR HY000: Cannot add foreign key constraint
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ALTER TABLE t2 ADD FOREIGN KEY(a) REFERENCES t1(a) ON UPDATE SET NULL;
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ERROR HY000: Cannot add foreign key constraint
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DROP TABLE t2, t1;
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# FK on virtual column not supported.
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CREATE TABLE t1(a INT PRIMARY KEY);
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CREATE TABLE t2(a INT, b INT GENERATED ALWAYS AS (a+1) VIRTUAL UNIQUE,
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FOREIGN KEY(b) REFERENCES t1(a));
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ERROR HY000: Cannot add foreign key constraint
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CREATE TABLE t2(a INT, b INT GENERATED ALWAYS AS (a+1) VIRTUAL UNIQUE);
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ALTER TABLE t2 ADD FOREIGN KEY (b) REFERENCES t1(a);
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ERROR HY000: Cannot add foreign key constraint
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DROP TABLE t2;
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CREATE TABLE t2(a INT, b INT, FOREIGN KEY(b) REFERENCES t1(a));
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ALTER TABLE t2 MODIFY COLUMN b INT GENERATED ALWAYS AS (a+1) VIRTUAL;
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ERROR HY000: 'Changing the STORED status' is not supported for generated columns.
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DROP TABLE t2, t1;
499+
# Trying to drop columns used in multi-column FKs.
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CREATE TABLE t1(a INT PRIMARY KEY, b INT, INDEX(a, b));
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CREATE TABLE t2(a INT, b INT, FOREIGN KEY(a, b) REFERENCES t1(a, b));
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ALTER TABLE t2 DROP COLUMN a;
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ERROR HY000: Cannot drop column 'a': needed in a foreign key constraint 't2_ibfk_1'
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ALTER TABLE t2 DROP COLUMN b;
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ERROR HY000: Cannot drop column 'b': needed in a foreign key constraint 't2_ibfk_1'
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DROP TABLE t2;
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# Use explicitly named index to check where index name is != column name.
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CREATE TABLE t2(a INT, b INT, INDEX idx(a, b),
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FOREIGN KEY(a, b) REFERENCES t1(a, b));
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ALTER TABLE t2 DROP COLUMN a;
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ERROR HY000: Cannot drop column 'a': needed in a foreign key constraint 't2_ibfk_1'
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ALTER TABLE t2 DROP COLUMN b;
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ERROR HY000: Cannot drop column 'b': needed in a foreign key constraint 't2_ibfk_1'
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DROP TABLE t2, t1;
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# Index with prefix cannot be used for supporting FK.
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CREATE TABLE t1 (PK VARCHAR(100) PRIMARY KEY);
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CREATE TABLE t2 (FK VARCHAR(100), FOREIGN KEY(FK) REFERENCES t1 (PK), KEY(FK));
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ALTER TABLE t2 DROP INDEX FK, ADD INDEX FK2(FK(10));
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ERROR HY000: Cannot drop index 'FK': needed in a foreign key constraint
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DROP TABLE t2, t1;
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SET @@foreign_key_checks= DEFAULT;

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