Adding testcase

mysql-test/suite/innodb/r/import.result

+CREATE TABLE t1 (a int) ENGINE=InnoDB;
+INSERT INTO t1 VALUES(42);
+CREATE TABLE t2 LIKE t1;
+ALTER TABLE t2 DISCARD TABLESPACE;
+FLUSH TABLES t1 FOR EXPORT;
+UNLOCK TABLES;
+ALTER TABLE t2 IMPORT TABLESPACE;
+SELECT * from t2;
+a
+42
+DROP TABLE t1, t2;
+#
+# MDEV-26137 ALTER TABLE IMPORT enhancement
+#
+CREATE TABLE t1 (a int) ENGINE=InnoDB;
+INSERT INTO t1 VALUES(42);
+FLUSH TABLES t1 FOR EXPORT;
+UNLOCK TABLES;
+ALTER TABLE t2 IMPORT TABLESPACE;
+SELECT * FROM t2;
+a
+42
+DROP TABLE t1, t2;
+CREATE TABLE t1 (a int) ENGINE=InnoDB;
+INSERT INTO t1 VALUES(42);
+FLUSH TABLES t1 FOR EXPORT;
+UNLOCK TABLES;
+DROP TABLE t1;
+ALTER TABLE t2 IMPORT TABLESPACE;
+SELECT * FROM t2;
+a
+42
+DROP TABLE t2;
+CREATE TABLE t1 (a int) ENGINE=InnoDB;
+INSERT INTO t1 VALUES(42);
+CREATE TABLE t2 LIKE t1;
+FLUSH TABLES t1 FOR EXPORT;
+UNLOCK TABLES;
+DROP TABLE t1;
+call mtr.add_suppression("InnoDB: Unable to import tablespace");
+ALTER TABLE t2 IMPORT TABLESPACE;
+ERROR HY000: Tablespace for table 'test/t2' exists. Please DISCARD the tablespace before IMPORT
+SELECT * FROM t2;
+a
+DROP TABLE t2;
+ALTER TABLE t2 IMPORT TABLESPACE;
+ERROR 42S02: Table 'test.t2' doesn't exist

mysql-test/suite/innodb/t/import.test

+--source include/have_innodb.inc
+let $MYSQLD_DATADIR = `SELECT @@datadir`;
+
+# existing workflow
+CREATE TABLE t1 (a int) ENGINE=InnoDB;
+INSERT INTO t1 VALUES(42);
+CREATE TABLE t2 LIKE t1;
+ALTER TABLE t2 DISCARD TABLESPACE;
+FLUSH TABLES t1 FOR EXPORT;
+--copy_file $MYSQLD_DATADIR/test/t1.cfg $MYSQLD_DATADIR/test/t2.cfg
+--copy_file $MYSQLD_DATADIR/test/t1.ibd $MYSQLD_DATADIR/test/t2.ibd
+UNLOCK TABLES;
+ALTER TABLE t2 IMPORT TABLESPACE;
+SELECT * from t2;
+DROP TABLE t1, t2;
+
+--echo #
+--echo # MDEV-26137 ALTER TABLE IMPORT enhancement
+--echo #
+
+# enhanced workflow
+CREATE TABLE t1 (a int) ENGINE=InnoDB;
+INSERT INTO t1 VALUES(42);
+FLUSH TABLES t1 FOR EXPORT;
+--copy_file $MYSQLD_DATADIR/test/t1.cfg $MYSQLD_DATADIR/test/t2.cfg
+--copy_file $MYSQLD_DATADIR/test/t1.frm $MYSQLD_DATADIR/test/t2.frm
+--copy_file $MYSQLD_DATADIR/test/t1.ibd $MYSQLD_DATADIR/test/t2.ibd
+UNLOCK TABLES;
+ALTER TABLE t2 IMPORT TABLESPACE;
+SELECT * FROM t2;
+DROP TABLE t1, t2;
+
+# a variant of the previous case, but we drop t1 before importing t2
+CREATE TABLE t1 (a int) ENGINE=InnoDB;
+INSERT INTO t1 VALUES(42);
+FLUSH TABLES t1 FOR EXPORT;
+--copy_file $MYSQLD_DATADIR/test/t1.cfg $MYSQLD_DATADIR/test/t2.cfg
+--copy_file $MYSQLD_DATADIR/test/t1.frm $MYSQLD_DATADIR/test/t2.frm
+--copy_file $MYSQLD_DATADIR/test/t1.ibd $MYSQLD_DATADIR/test/t2.ibd
+UNLOCK TABLES;
+DROP TABLE t1;
+ALTER TABLE t2 IMPORT TABLESPACE;
+SELECT * FROM t2;
+DROP TABLE t2;
+
+# created t2 but did not discard tablespace
+CREATE TABLE t1 (a int) ENGINE=InnoDB;
+INSERT INTO t1 VALUES(42);
+CREATE TABLE t2 LIKE t1;
+FLUSH TABLES t1 FOR EXPORT;
+--copy_file $MYSQLD_DATADIR/test/t1.cfg $MYSQLD_DATADIR/test/t2.cfg
+--error 1
+--copy_file $MYSQLD_DATADIR/test/t1.frm $MYSQLD_DATADIR/test/t2.frm
+--error 1
+--copy_file $MYSQLD_DATADIR/test/t1.ibd $MYSQLD_DATADIR/test/t2.ibd
+UNLOCK TABLES;
+DROP TABLE t1;
+call mtr.add_suppression("InnoDB: Unable to import tablespace");
+--error ER_TABLESPACE_EXISTS
+ALTER TABLE t2 IMPORT TABLESPACE;
+SELECT * FROM t2;
+DROP TABLE t2;
+
+# attempt to import when there's no tablespace
+--error ER_NO_SUCH_TABLE
+ALTER TABLE t2 IMPORT TABLESPACE;