MDEV-18009 Missing redo log flush in innodb.instant_alter_crash

Ensure that the 'auxiliary transactions' that are there for
flushing the incomplete undo log of the to-be-recovered DDL
transactions are actually making modifications.

This is a backport of 2fe40a7a
from MariaDB 10.4.

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

@@ -5,7 +5,7 @@ FLUSH TABLES;
 CREATE TABLE t1(id INT PRIMARY KEY, c2 INT UNIQUE)
 ENGINE=InnoDB ROW_FORMAT=REDUNDANT;
 CREATE TABLE t2 LIKE t1;
-INSERT INTO t1 VALUES(1,2);
+INSERT INTO t1 VALUES(0,2);
 BEGIN;
 INSERT INTO t2 VALUES(2,1);
 ALTER TABLE t2 ADD COLUMN (c3 TEXT NOT NULL DEFAULT 'De finibus bonorum');
@@ -15,16 +15,17 @@ ALTER TABLE t1 ADD COLUMN (c3 TEXT NOT NULL DEFAULT ' et malorum');
 connection default;
 SET DEBUG_SYNC='now WAIT_FOR ddl';
 SET GLOBAL innodb_flush_log_at_trx_commit=1;
-COMMIT;
+INSERT INTO t2 VALUES(3,4,'accusantium doloremque laudantium');
 # Kill the server
 disconnect ddl;
 SET GLOBAL innodb_purge_rseg_truncate_frequency=1;
 SELECT * FROM t1;
 id	c2
-1	2
+0	2
 SELECT * FROM t2;
 id	c2	c3
 2	1	De finibus bonorum
+3	4	accusantium doloremque laudantium
 BEGIN;
 DELETE FROM t1;
 ROLLBACK;
@@ -41,11 +42,13 @@ DELETE FROM t1;
 disconnect ddl;
 SET @saved_frequency= @@GLOBAL.innodb_purge_rseg_truncate_frequency;
 SET GLOBAL innodb_purge_rseg_truncate_frequency=1;
+FOUND 2 /\[Note\] InnoDB: Rolled back recovered transaction / in mysqld.1.err
 SELECT * FROM t1;
 id	c2
 SELECT * FROM t2;
 id	c2	c3
 2	1	De finibus bonorum
+3	4	accusantium doloremque laudantium
 64	42	De finibus bonorum
 347	33101	 et malorum
 BEGIN;
@@ -59,27 +62,32 @@ N_RECS=0; LEVEL=0
 header=0x010000030074 (id=0x696e66696d756d00)
 header=0x010008030000 (id=0x73757072656d756d00)
 t2 clustered index root page(type 18):
-N_RECS=4; LEVEL=0
+N_RECS=5; LEVEL=0
 header=0x010000030088 (id=0x696e66696d756d00)
 header=0x1000100b00b9 (id=0x80000000,
  DB_TRX_ID=0x000000000000,
  DB_ROLL_PTR=0x80000000000000,
  c2=NULL(4 bytes),
  c3=0x44652066696e6962757320626f6e6f72756d)
-header=0x0000180900d8 (id=0x80000002,
+header=0x0000180900d9 (id=0x80000002,
  DB_TRX_ID=0x000000000000,
  DB_ROLL_PTR=0x80000000000000,
  c2=0x80000001)
-header=0x0000200900f8 (id=0x80000040,
+header=0x0000200b0119 (id=0x80000003,
+ DB_TRX_ID=0x000000000000,
+ DB_ROLL_PTR=0x80000000000000,
+ c2=0x80000004,
+ c3=0x6163637573616e7469756d20646f6c6f72656d717565206c617564616e7469756d)
+header=0x000028090139 (id=0x80000040,
  DB_TRX_ID=0x000000000000,
  DB_ROLL_PTR=0x80000000000000,
  c2=0x8000002a)
-header=0x0000280b0074 (id=0x8000015b,
+header=0x0000300b0074 (id=0x8000015b,
  DB_TRX_ID=0x000000000000,
  DB_ROLL_PTR=0x80000000000000,
  c2=0x8000814d,
  c3=0x206574206d616c6f72756d)
-header=0x050008030000 (id=0x73757072656d756d00)
+header=0x060008030000 (id=0x73757072656d756d00)
 UNLOCK TABLES;
 DELETE FROM t2;
 InnoDB		0 transactions not purged

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

@@ -16,7 +16,7 @@ let MYSQLD_DATADIR=`select @@datadir`;
 CREATE TABLE t1(id INT PRIMARY KEY, c2 INT UNIQUE)
 ENGINE=InnoDB ROW_FORMAT=REDUNDANT;
 CREATE TABLE t2 LIKE t1;
-INSERT INTO t1 VALUES(1,2);
+INSERT INTO t1 VALUES(0,2);
 BEGIN;
 INSERT INTO t2 VALUES(2,1);
 ALTER TABLE t2 ADD COLUMN (c3 TEXT NOT NULL DEFAULT 'De finibus bonorum');
@@ -29,7 +29,7 @@ ALTER TABLE t1 ADD COLUMN (c3 TEXT NOT NULL DEFAULT ' et malorum');
 connection default;
 SET DEBUG_SYNC='now WAIT_FOR ddl';
 SET GLOBAL innodb_flush_log_at_trx_commit=1;
-COMMIT;
+INSERT INTO t2 VALUES(3,4,'accusantium doloremque laudantium');
 
 --source include/kill_mysqld.inc
 disconnect ddl;
@@ -62,6 +62,10 @@ disconnect ddl;
 SET @saved_frequency= @@GLOBAL.innodb_purge_rseg_truncate_frequency;
 SET GLOBAL innodb_purge_rseg_truncate_frequency=1;
 
+let SEARCH_FILE= $MYSQLTEST_VARDIR/log/mysqld.1.err;
+let SEARCH_PATTERN= \[Note\] InnoDB: Rolled back recovered transaction ;
+-- source include/search_pattern_in_file.inc
+
 SELECT * FROM t1;
 SELECT * FROM t2;
 BEGIN;