Null-merge

Already fixed in 5.5 as bug#56172,
but fixed in 5.1 as bug#55091.

Only test case was merged, no code change!

mysql-test/r/partition_innodb_plugin.result

+call mtr.add_suppression("nnoDB: Error: table `test`.`t1` .* Partition.* InnoDB internal");
+#
+# Bug#55091: Server crashes on ADD PARTITION after a failed attempt
+#
+SET @old_innodb_file_format_max = @@global.innodb_file_format_max;
+SET @old_innodb_file_format = @@global.innodb_file_format;
+SET @old_innodb_file_per_table = @@global.innodb_file_per_table;
+SET @old_innodb_strict_mode = @@global.innodb_strict_mode;
+SET @@global.innodb_file_format = Barracuda,
+@@global.innodb_file_per_table = ON,
+@@global.innodb_strict_mode = ON;
+# Connection con1
+CREATE TABLE t1 (id INT NOT NULL
+PRIMARY KEY,
+user_num CHAR(10)
+) ENGINE = InnoDB
+KEY_BLOCK_SIZE=4
+PARTITION BY HASH(id) PARTITIONS 1;
+t1#P#p0.ibd
+t1.frm
+t1.par
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `id` int(11) NOT NULL,
+  `user_num` char(10) DEFAULT NULL,
+  PRIMARY KEY (`id`)
+) ENGINE=InnoDB DEFAULT CHARSET=latin1 KEY_BLOCK_SIZE=4
+/*!50100 PARTITION BY HASH (id)
+PARTITIONS 1 */
+SET GLOBAL innodb_file_per_table = OFF;
+# Connection con2
+LOCK TABLE t1 WRITE;
+# ALTER fails because COMPRESSED/KEY_BLOCK_SIZE
+# are incompatible with innodb_file_per_table = OFF;
+ALTER TABLE t1 ADD PARTITION PARTITIONS 1;
+ERROR HY000: Got error 1478 from storage engine
+t1#P#p0.ibd
+t1.frm
+t1.par
+# This SET is not needed to reproduce the bug,
+# it is here just to make the test case more realistic
+SET innodb_strict_mode = OFF;
+ALTER TABLE t1 ADD PARTITION PARTITIONS 2;
+Warnings:
+Warning	1478	InnoDB: KEY_BLOCK_SIZE requires innodb_file_per_table.
+Warning	1478	InnoDB: ignoring KEY_BLOCK_SIZE=4.
+Warning	1478	InnoDB: KEY_BLOCK_SIZE requires innodb_file_per_table.
+Warning	1478	InnoDB: ignoring KEY_BLOCK_SIZE=4.
+Warning	1478	InnoDB: KEY_BLOCK_SIZE requires innodb_file_per_table.
+Warning	1478	InnoDB: ignoring KEY_BLOCK_SIZE=4.
+t1.frm
+t1.par
+ALTER TABLE t1 REBUILD PARTITION p0;
+Warnings:
+Warning	1478	InnoDB: KEY_BLOCK_SIZE requires innodb_file_per_table.
+Warning	1478	InnoDB: ignoring KEY_BLOCK_SIZE=4.
+UNLOCK TABLES;
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `id` int(11) NOT NULL,
+  `user_num` char(10) DEFAULT NULL,
+  PRIMARY KEY (`id`)
+) ENGINE=InnoDB DEFAULT CHARSET=latin1 KEY_BLOCK_SIZE=4
+/*!50100 PARTITION BY HASH (id)
+PARTITIONS 3 */
+DROP TABLE t1;
+# Connection default
+SET @@global.innodb_strict_mode = @old_innodb_strict_mode;
+SET @@global.innodb_file_format = @old_innodb_file_format;
+SET @@global.innodb_file_per_table = @old_innodb_file_per_table;
+SET @@global.innodb_file_format_max = @old_innodb_file_format_max;
 SET NAMES utf8;
 CREATE TABLE `t``\""e` (a INT, PRIMARY KEY (a))
 ENGINE=InnoDB

mysql-test/t/partition_innodb_plugin.test

 --source include/have_partition.inc
 --source include/have_innodb.inc
 
+let $MYSQLD_DATADIR= `SELECT @@datadir`;
+
+call mtr.add_suppression("nnoDB: Error: table `test`.`t1` .* Partition.* InnoDB internal");
+--echo #
+--echo # Bug#55091: Server crashes on ADD PARTITION after a failed attempt
+--echo #
+SET @old_innodb_file_format_max = @@global.innodb_file_format_max;
+SET @old_innodb_file_format = @@global.innodb_file_format;
+SET @old_innodb_file_per_table = @@global.innodb_file_per_table;
+SET @old_innodb_strict_mode = @@global.innodb_strict_mode;
+SET @@global.innodb_file_format = Barracuda,
+@@global.innodb_file_per_table = ON,
+@@global.innodb_strict_mode = ON;
+
+--echo # Connection con1
+--connect(con1,localhost,root,,)
+
+CREATE TABLE t1 (id INT NOT NULL
+PRIMARY KEY,
+user_num CHAR(10)
+) ENGINE = InnoDB
+KEY_BLOCK_SIZE=4
+PARTITION BY HASH(id) PARTITIONS 1;
+
+--list_files $MYSQLD_DATADIR/test
+SHOW CREATE TABLE t1;
+
+SET GLOBAL innodb_file_per_table = OFF;
+
+--disconnect con1
+--connect(con2,localhost,root,,)
+--echo # Connection con2
+
+LOCK TABLE t1 WRITE;
+
+--echo # ALTER fails because COMPRESSED/KEY_BLOCK_SIZE
+--echo # are incompatible with innodb_file_per_table = OFF;
+
+--error ER_GET_ERRNO
+ALTER TABLE t1 ADD PARTITION PARTITIONS 1;
+
+--list_files $MYSQLD_DATADIR/test
+--echo # This SET is not needed to reproduce the bug,
+--echo # it is here just to make the test case more realistic
+SET innodb_strict_mode = OFF;
+
+ALTER TABLE t1 ADD PARTITION PARTITIONS 2;
+--list_files $MYSQLD_DATADIR/test
+
+# really bug#56172
+ALTER TABLE t1 REBUILD PARTITION p0;
+
+UNLOCK TABLES;
+SHOW CREATE TABLE t1;
+DROP TABLE t1;
+
+--disconnect con2
+--connection default
+--echo # Connection default
+SET @@global.innodb_strict_mode = @old_innodb_strict_mode;
+SET @@global.innodb_file_format = @old_innodb_file_format;
+SET @@global.innodb_file_per_table = @old_innodb_file_per_table;
+SET @@global.innodb_file_format_max = @old_innodb_file_format_max;
+
 #
 # Bug#32430 - show engine innodb status causes errors
 #