MDEV-28822 Table from older version requires table rebuild when addin…

…g column to table with multi-column index

This problem was earlier fixed in 10.4 by the patch for MDEV-29481.

Adding MTR tests only.

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

@@ -2929,3 +2929,14 @@ t1	CREATE TABLE `t1` (
   KEY `f2` (`f2`)
 ) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
 DROP TABLE t1, t2;
+#
+# MDEV-28822 Table from older version requires table rebuild when adding column to table with multi-column index
+#
+CREATE TABLE mdev28822_100427_innodb (
+id int not null primary key,
+msg varchar(10),
+index(id, msg)
+) ENGINE=InnoDB ROW_FORMAT=DYNAMIC;
+FLUSH TABLES;
+ALTER TABLE mdev28822_100427_innodb ADD i1 INTEGER, ALGORITHM=INSTANT;
+DROP TABLE mdev28822_100427_innodb;

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

@@ -1,6 +1,8 @@
 --source include/innodb_page_size.inc
 --source include/have_sequence.inc
 
+let $datadir=`select @@datadir`;
+
 --echo #
 --echo # MDEV-11369: Instant ADD COLUMN for InnoDB
 --echo #
@@ -949,3 +951,19 @@ ALTER TABLE t1 DROP COLUMN f3, ADD FOREIGN KEY fk (f1)
 ALTER TABLE t1 DROP COLUMN f5;
 SHOW CREATE TABLE t1;
 DROP TABLE t1, t2;
+
+
+--echo #
+--echo # MDEV-28822 Table from older version requires table rebuild when adding column to table with multi-column index
+--echo #
+
+CREATE TABLE mdev28822_100427_innodb (
+  id int not null primary key,
+  msg varchar(10),
+  index(id, msg)
+) ENGINE=InnoDB ROW_FORMAT=DYNAMIC;
+FLUSH TABLES;
+remove_file $datadir/test/mdev28822_100427_innodb.frm;
+copy_file std_data/mysql_upgrade/mdev28822_100427_innodb.frm $datadir/test/mdev28822_100427_innodb.frm;
+ALTER TABLE mdev28822_100427_innodb ADD i1 INTEGER, ALGORITHM=INSTANT;
+DROP TABLE mdev28822_100427_innodb;