MDEV-371 Unique Index for long columns

This patch implements engine independent unique hash index.

Usage:- Unique HASH index can be created automatically for blob/varchar/test column whose key
 length > handler->max_key_length()
or it can be explicitly specified.

  Automatic Creation:-
   Create TABLE t1 (a blob unique);
  Explicit Creation:-
   Create TABLE t1 (a int , unique(a) using HASH);

Internal KEY_PART Representations:-
 Long unique key_info will have 2 representations.
 (lets understand this with an example create table t1(a blob, b blob , unique(a, b)); )

 1. User Given Representation:- key_info->key_part array will be similar to what user has defined.
 So in case of example it will have 2 key_parts (a, b)

 2. Storage Engine Representation:- In this case there will be only one key_part and it will point to
 HASH_FIELD. This key_part will be always after user defined key_parts.

 So:- User Given Representation          [a] [b] [hash_key_part]
                  key_info->key_part ----^
  Storage Engine Representation          [a] [b] [hash_key_part]
                  key_info->key_part ------------^

 Table->s->key_info will have User Given Representation, While table->key_info will have Storage Engine
 Representation.Representation can be changed into each other by calling re/setup_keyinfo_hash function.

Working:-

1. So when user specifies HASH_INDEX or key_length is > handler->max_key_length(), In mysql_prepare_create_table
One extra vfield is added (for each long unique key). And key_info->algorithm is set to HA_KEY_ALG_LONG_HASH.

2. In init_from_binary_frm_image values for hash_keypart is set (like fieldnr , field and flags)

3. In parse_vcol_defs, HASH_FIELD->vcol_info is created. Item_func_hash is used with list of Item_fields,
   When Explicit length is given by user then Item_left is used to concatenate Item_field values.

4. In ha_write_row/ha_update_row check_duplicate_long_entry_key is called which will create the hash key from
table->record[0] and then call ha_index_read_map , if we found duplicated hash , we will compare the result
field by field.

12 files changed, 3381 insertions, 4 deletions

diff --git a/mysql-test/main/long_unique.result b/mysql-test/main/long_unique.result
new file mode 100644
index 00000000000..38ec65700a0
--- /dev/null
+++ b/mysql-test/main/long_unique.result
@@ -0,0 +1,1408 @@
+#Structure of tests
+#First we will check all option for
+#table containing single unique column
+#table containing keys like unique(a,b,c,d) etc
+#then table containing 2 blob unique etc
+set @allowed_packet= @@max_allowed_packet;
+#table with single long blob column;
+create table t1(a blob  unique );
+insert into t1 values(1),(2),(3),(56),('sachin'),('maria'),(123456789034567891),(null),(null),(123456789034567890);
+#blob with primary key not allowed
+create table t2(a blob,primary key(a(10000)));
+ERROR 42000: Specified key was too long; max key length is 1000 bytes
+create table t3(a varchar(10000) primary key);
+ERROR 42000: Specified key was too long; max key length is 1000 bytes
+insert into t1 values(2);
+ERROR 23000: Duplicate entry '2' for key 'a'
+#table structure;
+desc t1;
+Field	Type	Null	Key	Default	Extra
+a	blob	YES	UNI	NULL	
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` blob DEFAULT NULL,
+  UNIQUE KEY `a` (`a`) USING HASH
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+show keys from t1;
+Table	t1
+Non_unique	0
+Key_name	a
+Seq_in_index	1
+Column_name	a
+Collation	A
+Cardinality	NULL
+Sub_part	NULL
+Packed	NULL
+Null	YES
+Index_type	HASH
+Comment	
+Index_comment	
+
+MyISAM file:         DATADIR/test/t1
+Record format:       Packed
+Character set:       latin1_swedish_ci (8)
+Data records:                   10  Deleted blocks:                 0
+Recordlength:                   20
+
+table description:
+Key Start Len Index   Type
+1   12    8   multip. ulonglong NULL       
+select * from information_schema.columns where table_schema = 'test' and table_name = 't1';
+TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	COLUMN_NAME	ORDINAL_POSITION	COLUMN_DEFAULT	IS_NULLABLE	DATA_TYPE	CHARACTER_MAXIMUM_LENGTH	CHARACTER_OCTET_LENGTH	NUMERIC_PRECISION	NUMERIC_SCALE	DATETIME_PRECISION	CHARACTER_SET_NAME	COLLATION_NAME	COLUMN_TYPE	COLUMN_KEY	EXTRA	PRIVILEGES	COLUMN_COMMENT	IS_GENERATED	GENERATION_EXPRESSION
+def	test	t1	a	1	NULL	YES	blob	65535	65535	NULL	NULL	NULL	NULL	NULL	blob	UNI		select,insert,update,references		NEVER	NULL
+select * from information_schema.statistics where table_schema = 'test' and table_name = 't1';
+TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	NON_UNIQUE	INDEX_SCHEMA	INDEX_NAME	SEQ_IN_INDEX	COLUMN_NAME	COLLATION	CARDINALITY	SUB_PART	PACKED	NULLABLE	INDEX_TYPE	COMMENT	INDEX_COMMENT
+def	test	t1	0	test	a	1	a	A	NULL	NULL	NULL	YES	HASH		
+select   * from information_schema.key_column_usage where table_schema= 'test' and table_name= 't1';
+CONSTRAINT_CATALOG	def
+CONSTRAINT_SCHEMA	test
+CONSTRAINT_NAME	a
+TABLE_CATALOG	def
+TABLE_SCHEMA	test
+TABLE_NAME	t1
+COLUMN_NAME	a
+ORDINAL_POSITION	1
+POSITION_IN_UNIQUE_CONSTRAINT	NULL
+REFERENCED_TABLE_SCHEMA	NULL
+REFERENCED_TABLE_NAME	NULL
+REFERENCED_COLUMN_NAME	NULL
+# table select we should not be able to see db_row_hash_column;
+select * from t1 order by a;
+a
+NULL
+NULL
+1
+123456789034567890
+123456789034567891
+2
+3
+56
+maria
+sachin
+select db_row_hash_1 from t1;
+ERROR 42S22: Unknown column 'db_row_hash_1' in 'field list'
+#duplicate entry test;
+insert into t1 values(2);
+ERROR 23000: Duplicate entry '2' for key 'a'
+insert into t1 values('sachin');
+ERROR 23000: Duplicate entry 'sachin' for key 'a'
+insert into t1 values(123456789034567891);
+ERROR 23000: Duplicate entry '123456789034567891' for key 'a'
+select * from t1 order by a;
+a
+NULL
+NULL
+1
+123456789034567890
+123456789034567891
+2
+3
+56
+maria
+sachin
+insert into t1 values(11),(22),(33);
+insert into t1 values(12),(22);
+ERROR 23000: Duplicate entry '22' for key 'a'
+select * from t1 order by a;
+a
+NULL
+NULL
+1
+11
+12
+123456789034567890
+123456789034567891
+2
+22
+3
+33
+56
+maria
+sachin
+insert into t1 values(repeat('s',4000*10)),(repeat('s',4001*10));
+insert into t1 values(repeat('m',4000*10)),(repeat('m',4000*10));
+ERROR 23000: Duplicate entry 'mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm' for key 'a'
+insert into t1 values(repeat('m',4001)),(repeat('m',4002));
+truncate table t1;
+insert into t1 values(1),(2),(3),(4),(5),(8),(7);
+
+MyISAM file:         DATADIR/test/t1
+Record format:       Packed
+Character set:       latin1_swedish_ci (8)
+Data records:                    7  Deleted blocks:                 0
+Recordlength:                   20
+
+table description:
+Key Start Len Index   Type
+1   12    8   multip. ulonglong NULL       
+#now some alter commands;
+alter table t1 add column b int;
+desc t1;
+Field	Type	Null	Key	Default	Extra
+a	blob	YES	UNI	NULL	
+b	int(11)	YES		NULL	
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` blob DEFAULT NULL,
+  `b` int(11) DEFAULT NULL,
+  UNIQUE KEY `a` (`a`) USING HASH
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+insert into t1 values(1,2);
+ERROR 23000: Duplicate entry '1' for key 'a'
+insert into t1 values(2,2);
+ERROR 23000: Duplicate entry '2' for key 'a'
+select db_row_hash_1 from t1;
+ERROR 42S22: Unknown column 'db_row_hash_1' in 'field list'
+#now try to change db_row_hash_1 column;
+alter table t1 drop column db_row_hash_1;
+ERROR 42000: Can't DROP COLUMN `db_row_hash_1`; check that it exists
+alter table t1 add column d int , add column e int , drop column db_row_hash_1;
+ERROR 42000: Can't DROP COLUMN `db_row_hash_1`; check that it exists
+alter table t1 modify column db_row_hash_1 int ;
+ERROR 42S22: Unknown column 'db_row_hash_1' in 't1'
+alter table t1 add column a int , add column b int, modify column db_row_hash_1 int ;
+ERROR 42S22: Unknown column 'db_row_hash_1' in 't1'
+alter table t1 change column db_row_hash_1 dsds int;
+ERROR 42S22: Unknown column 'db_row_hash_1' in 't1'
+alter table t1 add column asd int, change column db_row_hash_1 dsds int;
+ERROR 42S22: Unknown column 'db_row_hash_1' in 't1'
+alter table t1 drop column b , add column c int;
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` blob DEFAULT NULL,
+  `c` int(11) DEFAULT NULL,
+  UNIQUE KEY `a` (`a`) USING HASH
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+#now add some column with name db_row_hash;
+alter table t1 add column db_row_hash_1 int unique;
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` blob DEFAULT NULL,
+  `c` int(11) DEFAULT NULL,
+  `db_row_hash_1` int(11) DEFAULT NULL,
+  UNIQUE KEY `a` (`a`) USING HASH,
+  UNIQUE KEY `db_row_hash_1` (`db_row_hash_1`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+insert into t1 values(45,1,55),(46,1,55);
+ERROR 23000: Duplicate entry '55' for key 'db_row_hash_1'
+insert into t1 values(45,1,55),(45,1,55);
+ERROR 23000: Duplicate entry '45' for key 'a'
+alter table t1 add column db_row_hash_2 int, add column db_row_hash_3 int;
+desc t1;
+Field	Type	Null	Key	Default	Extra
+a	blob	YES	UNI	NULL	
+c	int(11)	YES		NULL	
+db_row_hash_1	int(11)	YES	UNI	NULL	
+db_row_hash_2	int(11)	YES		NULL	
+db_row_hash_3	int(11)	YES		NULL	
+#this should also drop the unique index ;
+alter table t1 drop column a;
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `c` int(11) DEFAULT NULL,
+  `db_row_hash_1` int(11) DEFAULT NULL,
+  `db_row_hash_2` int(11) DEFAULT NULL,
+  `db_row_hash_3` int(11) DEFAULT NULL,
+  UNIQUE KEY `db_row_hash_1` (`db_row_hash_1`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+show keys from t1;
+Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment	Index_comment
+t1	0	db_row_hash_1	1	db_row_hash_1	A	NULL	NULL	NULL	YES	BTREE		
+#add column with unique index on blob ;
+alter table t1 add column a blob unique;
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `c` int(11) DEFAULT NULL,
+  `db_row_hash_1` int(11) DEFAULT NULL,
+  `db_row_hash_2` int(11) DEFAULT NULL,
+  `db_row_hash_3` int(11) DEFAULT NULL,
+  `a` blob DEFAULT NULL,
+  UNIQUE KEY `db_row_hash_1` (`db_row_hash_1`),
+  UNIQUE KEY `a` (`a`) USING HASH
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+# try to change the blob unique name;
+alter table t1 change column a aa blob ;
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `c` int(11) DEFAULT NULL,
+  `db_row_hash_1` int(11) DEFAULT NULL,
+  `db_row_hash_2` int(11) DEFAULT NULL,
+  `db_row_hash_3` int(11) DEFAULT NULL,
+  `aa` blob DEFAULT NULL,
+  UNIQUE KEY `db_row_hash_1` (`db_row_hash_1`),
+  UNIQUE KEY `a` (`aa`) USING HASH
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+show keys from t1;
+Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment	Index_comment
+t1	0	db_row_hash_1	1	db_row_hash_1	A	NULL	NULL	NULL	YES	BTREE		
+t1	0	a	1	aa	A	NULL	NULL	NULL	YES	HASH		
+# try to change the blob unique datatype;
+#this will change index to b tree;
+alter table t1 modify  column aa  int ;
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `c` int(11) DEFAULT NULL,
+  `db_row_hash_1` int(11) DEFAULT NULL,
+  `db_row_hash_2` int(11) DEFAULT NULL,
+  `db_row_hash_3` int(11) DEFAULT NULL,
+  `aa` int(11) DEFAULT NULL,
+  UNIQUE KEY `db_row_hash_1` (`db_row_hash_1`),
+  UNIQUE KEY `a` (`aa`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+show keys from t1;
+Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment	Index_comment
+t1	0	db_row_hash_1	1	db_row_hash_1	A	NULL	NULL	NULL	YES	BTREE		
+t1	0	a	1	aa	A	NULL	NULL	NULL	YES	BTREE		
+alter table t1 add column clm blob unique;
+#try changing the name ;
+alter table t1 change column clm clm_changed blob;
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `c` int(11) DEFAULT NULL,
+  `db_row_hash_1` int(11) DEFAULT NULL,
+  `db_row_hash_2` int(11) DEFAULT NULL,
+  `db_row_hash_3` int(11) DEFAULT NULL,
+  `aa` int(11) DEFAULT NULL,
+  `clm_changed` blob DEFAULT NULL,
+  UNIQUE KEY `db_row_hash_1` (`db_row_hash_1`),
+  UNIQUE KEY `a` (`aa`),
+  UNIQUE KEY `clm` (`clm_changed`) USING HASH
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+show keys from t1;
+Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment	Index_comment
+t1	0	db_row_hash_1	1	db_row_hash_1	A	NULL	NULL	NULL	YES	BTREE		
+t1	0	a	1	aa	A	NULL	NULL	NULL	YES	BTREE		
+t1	0	clm	1	clm_changed	A	NULL	NULL	NULL	YES	HASH		
+#now drop the unique key;
+alter table t1 drop key clm;
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `c` int(11) DEFAULT NULL,
+  `db_row_hash_1` int(11) DEFAULT NULL,
+  `db_row_hash_2` int(11) DEFAULT NULL,
+  `db_row_hash_3` int(11) DEFAULT NULL,
+  `aa` int(11) DEFAULT NULL,
+  `clm_changed` blob DEFAULT NULL,
+  UNIQUE KEY `db_row_hash_1` (`db_row_hash_1`),
+  UNIQUE KEY `a` (`aa`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+show keys from t1;
+Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment	Index_comment
+t1	0	db_row_hash_1	1	db_row_hash_1	A	NULL	NULL	NULL	YES	BTREE		
+t1	0	a	1	aa	A	NULL	NULL	NULL	YES	BTREE		
+drop table t1;
+create table t1 (a TEXT CHARSET latin1 COLLATE latin1_german2_ci unique);
+desc t1;
+Field	Type	Null	Key	Default	Extra
+a	text	YES	UNI	NULL	
+show keys from t1;
+Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment	Index_comment
+t1	0	a	1	a	A	NULL	NULL	NULL	YES	HASH		
+insert into t1 values ('ae');
+insert into t1 values ('AE');
+ERROR 23000: Duplicate entry 'AE' for key 'a'
+insert  into t1 values ('Ä');
+drop table t1;
+create table t1 (a int primary key, b blob unique);
+desc t1;
+Field	Type	Null	Key	Default	Extra
+a	int(11)	NO	PRI	NULL	
+b	blob	YES	UNI	NULL	
+show keys from t1;
+Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment	Index_comment
+t1	0	PRIMARY	1	a	A	0	NULL	NULL		BTREE		
+t1	0	b	1	b	A	NULL	NULL	NULL	YES	HASH		
+insert into t1 values(1,1),(2,2),(3,3);
+insert into t1 values(1,1);
+ERROR 23000: Duplicate entry '1' for key 'b'
+insert into t1 values(7,1);
+ERROR 23000: Duplicate entry '1' for key 'b'
+drop table t1;
+#table with multiple  long blob column and varchar text column ;
+create table t1(a blob unique, b int , c blob unique , d text unique , e varchar(3000) unique);
+insert into t1 values(1,2,3,4,5),(2,11,22,33,44),(3111,222,333,444,555),(5611,2222,3333,4444,5555),
+('sachin',341,'fdf','gfgfgfg','hghgr'),('maria',345,'frter','dasd','utyuty'),
+(123456789034567891,353534,53453453453456,64565464564564,45435345345345),
+(123456789034567890,43545,657567567567,78967657567567,657567567567567676);
+#table structure;
+desc t1;
+Field	Type	Null	Key	Default	Extra
+a	blob	YES	UNI	NULL	
+b	int(11)	YES		NULL	
+c	blob	YES	UNI	NULL	
+d	text	YES	UNI	NULL	
+e	varchar(3000)	YES	UNI	NULL	
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` blob DEFAULT NULL,
+  `b` int(11) DEFAULT NULL,
+  `c` blob DEFAULT NULL,
+  `d` text DEFAULT NULL,
+  `e` varchar(3000) DEFAULT NULL,
+  UNIQUE KEY `a` (`a`) USING HASH,
+  UNIQUE KEY `c` (`c`) USING HASH,
+  UNIQUE KEY `d` (`d`) USING HASH,
+  UNIQUE KEY `e` (`e`) USING HASH
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+show keys from t1;
+Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment	Index_comment
+t1	0	a	1	a	A	NULL	NULL	NULL	YES	HASH		
+t1	0	c	1	c	A	NULL	NULL	NULL	YES	HASH		
+t1	0	d	1	d	A	NULL	NULL	NULL	YES	HASH		
+t1	0	e	1	e	A	NULL	NULL	NULL	YES	HASH		
+
+MyISAM file:         DATADIR/test/t1
+Record format:       Packed
+Character set:       latin1_swedish_ci (8)
+Data records:                    8  Deleted blocks:                 0
+Recordlength:                 3072
+
+table description:
+Key Start Len Index   Type
+1   3039  8   multip. ulonglong NULL       
+2   3047  8   multip. ulonglong NULL       
+3   3055  8   multip. ulonglong NULL       
+4   3063  8   multip. ulonglong NULL       
+select * from information_schema.columns where table_schema = 'test' and table_name = 't1';
+TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	COLUMN_NAME	ORDINAL_POSITION	COLUMN_DEFAULT	IS_NULLABLE	DATA_TYPE	CHARACTER_MAXIMUM_LENGTH	CHARACTER_OCTET_LENGTH	NUMERIC_PRECISION	NUMERIC_SCALE	DATETIME_PRECISION	CHARACTER_SET_NAME	COLLATION_NAME	COLUMN_TYPE	COLUMN_KEY	EXTRA	PRIVILEGES	COLUMN_COMMENT	IS_GENERATED	GENERATION_EXPRESSION
+def	test	t1	a	1	NULL	YES	blob	65535	65535	NULL	NULL	NULL	NULL	NULL	blob	UNI		select,insert,update,references		NEVER	NULL
+def	test	t1	b	2	NULL	YES	int	NULL	NULL	10	0	NULL	NULL	NULL	int(11)			select,insert,update,references		NEVER	NULL
+def	test	t1	c	3	NULL	YES	blob	65535	65535	NULL	NULL	NULL	NULL	NULL	blob	UNI		select,insert,update,references		NEVER	NULL
+def	test	t1	d	4	NULL	YES	text	65535	65535	NULL	NULL	NULL	latin1	latin1_swedish_ci	text	UNI		select,insert,update,references		NEVER	NULL
+def	test	t1	e	5	NULL	YES	varchar	3000	3000	NULL	NULL	NULL	latin1	latin1_swedish_ci	varchar(3000)	UNI		select,insert,update,references		NEVER	NULL
+select * from information_schema.statistics where table_schema = 'test' and table_name = 't1';
+TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	NON_UNIQUE	INDEX_SCHEMA	INDEX_NAME	SEQ_IN_INDEX	COLUMN_NAME	COLLATION	CARDINALITY	SUB_PART	PACKED	NULLABLE	INDEX_TYPE	COMMENT	INDEX_COMMENT
+def	test	t1	0	test	a	1	a	A	NULL	NULL	NULL	YES	HASH		
+def	test	t1	0	test	c	1	c	A	NULL	NULL	NULL	YES	HASH		
+def	test	t1	0	test	d	1	d	A	NULL	NULL	NULL	YES	HASH		
+def	test	t1	0	test	e	1	e	A	NULL	NULL	NULL	YES	HASH		
+select * from information_schema.key_column_usage where table_schema= 'test' and table_name= 't1';
+CONSTRAINT_CATALOG	CONSTRAINT_SCHEMA	CONSTRAINT_NAME	TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	COLUMN_NAME	ORDINAL_POSITION	POSITION_IN_UNIQUE_CONSTRAINT	REFERENCED_TABLE_SCHEMA	REFERENCED_TABLE_NAME	REFERENCED_COLUMN_NAME
+def	test	a	def	test	t1	a	1	NULL	NULL	NULL	NULL
+def	test	c	def	test	t1	c	1	NULL	NULL	NULL	NULL
+def	test	d	def	test	t1	d	1	NULL	NULL	NULL	NULL
+def	test	e	def	test	t1	e	1	NULL	NULL	NULL	NULL
+#table select we should not be able to see db_row_hash_1 column;
+select * from t1 order by a;
+a	b	c	d	e
+1	2	3	4	5
+123456789034567890	43545	657567567567	78967657567567	657567567567567676
+123456789034567891	353534	53453453453456	64565464564564	45435345345345
+2	11	22	33	44
+3111	222	333	444	555
+5611	2222	3333	4444	5555
+maria	345	frter	dasd	utyuty
+sachin	341	fdf	gfgfgfg	hghgr
+select db_row_hash_1 from t1;
+ERROR 42S22: Unknown column 'db_row_hash_1' in 'field list'
+select db_row_hash_2 from t1;
+ERROR 42S22: Unknown column 'db_row_hash_2' in 'field list'
+select db_row_hash_3 from t1;
+ERROR 42S22: Unknown column 'db_row_hash_3' in 'field list'
+#duplicate entry test;
+insert into t1 values(21,2,3,42,51);
+ERROR 23000: Duplicate entry '3' for key 'c'
+insert into t1 values('sachin',null,null,null,null);
+ERROR 23000: Duplicate entry 'sachin' for key 'a'
+insert into t1 values(1234567890345671890,4353451,6575675675617,789676575675617,657567567567567676);
+ERROR 23000: Duplicate entry '657567567567567676' for key 'e'
+select * from t1 order by a;
+a	b	c	d	e
+1	2	3	4	5
+123456789034567890	43545	657567567567	78967657567567	657567567567567676
+123456789034567891	353534	53453453453456	64565464564564	45435345345345
+2	11	22	33	44
+3111	222	333	444	555
+5611	2222	3333	4444	5555
+maria	345	frter	dasd	utyuty
+sachin	341	fdf	gfgfgfg	hghgr
+insert into t1 values(repeat('s',4000*10),100,repeat('s',4000*10),repeat('s',4000*10),
+repeat('s',400)),(repeat('s',4001*10),1000,repeat('s',4001*10),repeat('s',4001*10),
+repeat('s',2995));
+insert into t1 values(repeat('m',4000*11),10,repeat('s',4000*11),repeat('s',4000*11),repeat('s',2995));
+ERROR 23000: Duplicate entry 'ssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss' for key 'e'
+truncate table t1;
+insert into t1 values(1,2,3,4,5),(2,11,22,33,44),(3111,222,333,444,555),(5611,2222,3333,4444,5555);
+#now some alter commands;
+alter table t1 add column f int;
+desc t1;
+Field	Type	Null	Key	Default	Extra
+a	blob	YES	UNI	NULL	
+b	int(11)	YES		NULL	
+c	blob	YES	UNI	NULL	
+d	text	YES	UNI	NULL	
+e	varchar(3000)	YES	UNI	NULL	
+f	int(11)	YES		NULL	
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` blob DEFAULT NULL,
+  `b` int(11) DEFAULT NULL,
+  `c` blob DEFAULT NULL,
+  `d` text DEFAULT NULL,
+  `e` varchar(3000) DEFAULT NULL,
+  `f` int(11) DEFAULT NULL,
+  UNIQUE KEY `a` (`a`) USING HASH,
+  UNIQUE KEY `c` (`c`) USING HASH,
+  UNIQUE KEY `d` (`d`) USING HASH,
+  UNIQUE KEY `e` (`e`) USING HASH
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+#unique key should not break;
+insert into t1 values(1,2,3,4,5,6);
+ERROR 23000: Duplicate entry '1' for key 'a'
+select db_row_hash_1 , db_row_hash_2, db_row_hash_3 from t1;
+ERROR 42S22: Unknown column 'db_row_hash_1' in 'field list'
+#now try to change db_row_hash_1 column;
+alter table t1 drop column db_row_hash_1, drop column db_row_hash_2, drop column db_row_hash_3;
+ERROR 42000: Can't DROP COLUMN `db_row_hash_1`; check that it exists
+alter table t1 add column dg int , add column ef int , drop column db_row_hash_1;
+ERROR 42000: Can't DROP COLUMN `db_row_hash_1`; check that it exists
+alter table t1 modify column db_row_hash_1 int , modify column db_row_hash_2 int, modify column db_row_hash_3 int;
+ERROR 42S22: Unknown column 'db_row_hash_1' in 't1'
+alter table t1 add column ar int , add column rb int, modify column db_row_hash_1 int , modify column db_row_hash_3 int;
+ERROR 42S22: Unknown column 'db_row_hash_1' in 't1'
+alter table t1 change column db_row_hash_1 dsds int , change column  db_row_hash_2  dfdf int , change column db_row_hash_3 gdfg int ;
+ERROR 42S22: Unknown column 'db_row_hash_1' in 't1'
+alter table t1 add column asd int, drop column a, change column db_row_hash_1 dsds int, change db_row_hash_3 fdfdfd int;
+ERROR 42S22: Unknown column 'db_row_hash_1' in 't1'
+alter table t1 drop column b , add column g int;
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` blob DEFAULT NULL,
+  `c` blob DEFAULT NULL,
+  `d` text DEFAULT NULL,
+  `e` varchar(3000) DEFAULT NULL,
+  `f` int(11) DEFAULT NULL,
+  `g` int(11) DEFAULT NULL,
+  UNIQUE KEY `a` (`a`) USING HASH,
+  UNIQUE KEY `c` (`c`) USING HASH,
+  UNIQUE KEY `d` (`d`) USING HASH,
+  UNIQUE KEY `e` (`e`) USING HASH
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+#now add some column with name db_row_hash;
+alter table t1 add column db_row_hash_1 int unique;
+alter table t1 add column db_row_hash_2 int unique;
+alter table t1 add column db_row_hash_3 int unique;
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` blob DEFAULT NULL,
+  `c` blob DEFAULT NULL,
+  `d` text DEFAULT NULL,
+  `e` varchar(3000) DEFAULT NULL,
+  `f` int(11) DEFAULT NULL,
+  `g` int(11) DEFAULT NULL,
+  `db_row_hash_1` int(11) DEFAULT NULL,
+  `db_row_hash_2` int(11) DEFAULT NULL,
+  `db_row_hash_3` int(11) DEFAULT NULL,
+  UNIQUE KEY `a` (`a`) USING HASH,
+  UNIQUE KEY `c` (`c`) USING HASH,
+  UNIQUE KEY `d` (`d`) USING HASH,
+  UNIQUE KEY `e` (`e`) USING HASH,
+  UNIQUE KEY `db_row_hash_1` (`db_row_hash_1`),
+  UNIQUE KEY `db_row_hash_2` (`db_row_hash_2`),
+  UNIQUE KEY `db_row_hash_3` (`db_row_hash_3`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+alter table t1 add column db_row_hash_7 int, add column db_row_hash_5 int , add column db_row_hash_4 int ;
+alter table t1 drop column db_row_hash_7,drop column db_row_hash_3, drop column db_row_hash_4;
+desc t1;
+Field	Type	Null	Key	Default	Extra
+a	blob	YES	UNI	NULL	
+c	blob	YES	UNI	NULL	
+d	text	YES	UNI	NULL	
+e	varchar(3000)	YES	UNI	NULL	
+f	int(11)	YES		NULL	
+g	int(11)	YES		NULL	
+db_row_hash_1	int(11)	YES	UNI	NULL	
+db_row_hash_2	int(11)	YES	UNI	NULL	
+db_row_hash_5	int(11)	YES		NULL	
+#this should not break anything;
+insert into t1 values(1,2,3,4,5,6,23,5,6);
+ERROR 23000: Duplicate entry '1' for key 'a'
+#this should also drop the unique index;
+alter table t1 drop column a, drop column c;
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `d` text DEFAULT NULL,
+  `e` varchar(3000) DEFAULT NULL,
+  `f` int(11) DEFAULT NULL,
+  `g` int(11) DEFAULT NULL,
+  `db_row_hash_1` int(11) DEFAULT NULL,
+  `db_row_hash_2` int(11) DEFAULT NULL,
+  `db_row_hash_5` int(11) DEFAULT NULL,
+  UNIQUE KEY `d` (`d`) USING HASH,
+  UNIQUE KEY `e` (`e`) USING HASH,
+  UNIQUE KEY `db_row_hash_1` (`db_row_hash_1`),
+  UNIQUE KEY `db_row_hash_2` (`db_row_hash_2`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+show keys from t1;
+Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment	Index_comment
+t1	0	d	1	d	A	NULL	NULL	NULL	YES	HASH		
+t1	0	e	1	e	A	NULL	NULL	NULL	YES	HASH		
+t1	0	db_row_hash_1	1	db_row_hash_1	A	NULL	NULL	NULL	YES	BTREE		
+t1	0	db_row_hash_2	1	db_row_hash_2	A	NULL	NULL	NULL	YES	BTREE		
+#add column with unique index on blob;
+alter table t1 add column a blob unique;
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `d` text DEFAULT NULL,
+  `e` varchar(3000) DEFAULT NULL,
+  `f` int(11) DEFAULT NULL,
+  `g` int(11) DEFAULT NULL,
+  `db_row_hash_1` int(11) DEFAULT NULL,
+  `db_row_hash_2` int(11) DEFAULT NULL,
+  `db_row_hash_5` int(11) DEFAULT NULL,
+  `a` blob DEFAULT NULL,
+  UNIQUE KEY `d` (`d`) USING HASH,
+  UNIQUE KEY `e` (`e`) USING HASH,
+  UNIQUE KEY `db_row_hash_1` (`db_row_hash_1`),
+  UNIQUE KEY `db_row_hash_2` (`db_row_hash_2`),
+  UNIQUE KEY `a` (`a`) USING HASH
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+show keys from t1;
+Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment	Index_comment
+t1	0	d	1	d	A	NULL	NULL	NULL	YES	HASH		
+t1	0	e	1	e	A	NULL	NULL	NULL	YES	HASH		
+t1	0	db_row_hash_1	1	db_row_hash_1	A	NULL	NULL	NULL	YES	BTREE		
+t1	0	db_row_hash_2	1	db_row_hash_2	A	NULL	NULL	NULL	YES	BTREE		
+t1	0	a	1	a	A	NULL	NULL	NULL	YES	HASH		
+#try to change the blob unique column name;
+#this will change index to b tree;
+alter table t1 modify  column a  int ,  modify column e int;
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `d` text DEFAULT NULL,
+  `e` int(11) DEFAULT NULL,
+  `f` int(11) DEFAULT NULL,
+  `g` int(11) DEFAULT NULL,
+  `db_row_hash_1` int(11) DEFAULT NULL,
+  `db_row_hash_2` int(11) DEFAULT NULL,
+  `db_row_hash_5` int(11) DEFAULT NULL,
+  `a` int(11) DEFAULT NULL,
+  UNIQUE KEY `d` (`d`) USING HASH,
+  UNIQUE KEY `e` (`e`),
+  UNIQUE KEY `db_row_hash_1` (`db_row_hash_1`),
+  UNIQUE KEY `db_row_hash_2` (`db_row_hash_2`),
+  UNIQUE KEY `a` (`a`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+show keys from t1;
+Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment	Index_comment
+t1	0	d	1	d	A	NULL	NULL	NULL	YES	HASH		
+t1	0	e	1	e	A	NULL	NULL	NULL	YES	BTREE		
+t1	0	db_row_hash_1	1	db_row_hash_1	A	NULL	NULL	NULL	YES	BTREE		
+t1	0	db_row_hash_2	1	db_row_hash_2	A	NULL	NULL	NULL	YES	BTREE		
+t1	0	a	1	a	A	NULL	NULL	NULL	YES	BTREE		
+alter table t1 add column clm1 blob unique,add column clm2 blob unique;
+#try changing the name; 
+alter table t1 change column clm1 clm_changed1 blob, change column clm2 clm_changed2 blob;
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `d` text DEFAULT NULL,
+  `e` int(11) DEFAULT NULL,
+  `f` int(11) DEFAULT NULL,
+  `g` int(11) DEFAULT NULL,
+  `db_row_hash_1` int(11) DEFAULT NULL,
+  `db_row_hash_2` int(11) DEFAULT NULL,
+  `db_row_hash_5` int(11) DEFAULT NULL,
+  `a` int(11) DEFAULT NULL,
+  `clm_changed1` blob DEFAULT NULL,
+  `clm_changed2` blob DEFAULT NULL,
+  UNIQUE KEY `d` (`d`) USING HASH,
+  UNIQUE KEY `e` (`e`),
+  UNIQUE KEY `db_row_hash_1` (`db_row_hash_1`),
+  UNIQUE KEY `db_row_hash_2` (`db_row_hash_2`),
+  UNIQUE KEY `a` (`a`),
+  UNIQUE KEY `clm1` (`clm_changed1`) USING HASH,
+  UNIQUE KEY `clm2` (`clm_changed2`) USING HASH
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+show keys from t1;
+Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment	Index_comment
+t1	0	d	1	d	A	NULL	NULL	NULL	YES	HASH		
+t1	0	e	1	e	A	NULL	NULL	NULL	YES	BTREE		
+t1	0	db_row_hash_1	1	db_row_hash_1	A	NULL	NULL	NULL	YES	BTREE		
+t1	0	db_row_hash_2	1	db_row_hash_2	A	NULL	NULL	NULL	YES	BTREE		
+t1	0	a	1	a	A	NULL	NULL	NULL	YES	BTREE		
+t1	0	clm1	1	clm_changed1	A	NULL	NULL	NULL	YES	HASH		
+t1	0	clm2	1	clm_changed2	A	NULL	NULL	NULL	YES	HASH		
+#now drop the unique key;
+alter table t1 drop key clm1, drop key clm2;
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `d` text DEFAULT NULL,
+  `e` int(11) DEFAULT NULL,
+  `f` int(11) DEFAULT NULL,
+  `g` int(11) DEFAULT NULL,
+  `db_row_hash_1` int(11) DEFAULT NULL,
+  `db_row_hash_2` int(11) DEFAULT NULL,
+  `db_row_hash_5` int(11) DEFAULT NULL,
+  `a` int(11) DEFAULT NULL,
+  `clm_changed1` blob DEFAULT NULL,
+  `clm_changed2` blob DEFAULT NULL,
+  UNIQUE KEY `d` (`d`) USING HASH,
+  UNIQUE KEY `e` (`e`),
+  UNIQUE KEY `db_row_hash_1` (`db_row_hash_1`),
+  UNIQUE KEY `db_row_hash_2` (`db_row_hash_2`),
+  UNIQUE KEY `a` (`a`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+show keys from t1;
+Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment	Index_comment
+t1	0	d	1	d	A	NULL	NULL	NULL	YES	HASH		
+t1	0	e	1	e	A	NULL	NULL	NULL	YES	BTREE		
+t1	0	db_row_hash_1	1	db_row_hash_1	A	NULL	NULL	NULL	YES	BTREE		
+t1	0	db_row_hash_2	1	db_row_hash_2	A	NULL	NULL	NULL	YES	BTREE		
+t1	0	a	1	a	A	NULL	NULL	NULL	YES	BTREE		
+drop table t1;
+#now the table with key on multiple columns; the ultimate test;
+create table t1(a blob, b int , c varchar(2000) , d text  , e varchar(3000) , f longblob , g int , h text ,
+unique(a,b,c), unique(c,d,e),unique(e,f,g,h), unique(b,d,g,h));
+insert into t1 values(1,1,1,1,1,1,1,1),(2,2,2,2,2,2,2,2),(3,3,3,3,3,3,3,3),(4,4,4,4,4,4,4,4),(5,5,5,5,5,5,5,5),
+('maria',6,'maria','maria','maria','maria',6,'maria'),('mariadb',7,'mariadb','mariadb','mariadb','mariadb',8,'mariadb')
+,(null,null,null,null,null,null,null,null),(null,null,null,null,null,null,null,null);
+#table structure;
+desc t1;
+Field	Type	Null	Key	Default	Extra
+a	blob	YES	MUL	NULL	
+b	int(11)	YES	MUL	NULL	
+c	varchar(2000)	YES	MUL	NULL	
+d	text	YES		NULL	
+e	varchar(3000)	YES	MUL	NULL	
+f	longblob	YES		NULL	
+g	int(11)	YES		NULL	
+h	text	YES		NULL	
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` blob DEFAULT NULL,
+  `b` int(11) DEFAULT NULL,
+  `c` varchar(2000) DEFAULT NULL,
+  `d` text DEFAULT NULL,
+  `e` varchar(3000) DEFAULT NULL,
+  `f` longblob DEFAULT NULL,
+  `g` int(11) DEFAULT NULL,
+  `h` text DEFAULT NULL,
+  UNIQUE KEY `a` (`a`,`b`,`c`) USING HASH,
+  UNIQUE KEY `c` (`c`,`d`,`e`) USING HASH,
+  UNIQUE KEY `e` (`e`,`f`,`g`,`h`) USING HASH,
+  UNIQUE KEY `b` (`b`,`d`,`g`,`h`) USING HASH
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+show keys from t1;
+Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment	Index_comment
+t1	0	a	1	a	A	NULL	NULL	NULL	YES	HASH		
+t1	0	a	2	b	A	NULL	NULL	NULL	YES	HASH		
+t1	0	a	3	c	A	NULL	NULL	NULL	YES	HASH		
+t1	0	c	1	c	A	NULL	NULL	NULL	YES	HASH		
+t1	0	c	2	d	A	NULL	NULL	NULL	YES	HASH		
+t1	0	c	3	e	A	NULL	NULL	NULL	YES	HASH		
+t1	0	e	1	e	A	NULL	NULL	NULL	YES	HASH		
+t1	0	e	2	f	A	NULL	NULL	NULL	YES	HASH		
+t1	0	e	3	g	A	NULL	NULL	NULL	YES	HASH		
+t1	0	e	4	h	A	NULL	NULL	NULL	YES	HASH		
+t1	0	b	1	b	A	NULL	NULL	NULL	YES	HASH		
+t1	0	b	2	d	A	NULL	NULL	NULL	YES	HASH		
+t1	0	b	3	g	A	NULL	NULL	NULL	YES	HASH		
+t1	0	b	4	h	A	NULL	NULL	NULL	YES	HASH		
+
+MyISAM file:         DATADIR/test/t1
+Record format:       Packed
+Character set:       latin1_swedish_ci (8)
+Data records:                    9  Deleted blocks:                 0
+Recordlength:                 5092
+
+table description:
+Key Start Len Index   Type
+1   5057  8   multip. ulonglong NULL       
+2   5065  8   multip. ulonglong NULL       
+3   5073  8   multip. ulonglong NULL       
+4   5081  8   multip. ulonglong NULL       
+select * from information_schema.columns where table_schema = 'test' and table_name = 't1';
+TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	COLUMN_NAME	ORDINAL_POSITION	COLUMN_DEFAULT	IS_NULLABLE	DATA_TYPE	CHARACTER_MAXIMUM_LENGTH	CHARACTER_OCTET_LENGTH	NUMERIC_PRECISION	NUMERIC_SCALE	DATETIME_PRECISION	CHARACTER_SET_NAME	COLLATION_NAME	COLUMN_TYPE	COLUMN_KEY	EXTRA	PRIVILEGES	COLUMN_COMMENT	IS_GENERATED	GENERATION_EXPRESSION
+def	test	t1	a	1	NULL	YES	blob	65535	65535	NULL	NULL	NULL	NULL	NULL	blob	MUL		select,insert,update,references		NEVER	NULL
+def	test	t1	b	2	NULL	YES	int	NULL	NULL	10	0	NULL	NULL	NULL	int(11)	MUL		select,insert,update,references		NEVER	NULL
+def	test	t1	c	3	NULL	YES	varchar	2000	2000	NULL	NULL	NULL	latin1	latin1_swedish_ci	varchar(2000)	MUL		select,insert,update,references		NEVER	NULL
+def	test	t1	d	4	NULL	YES	text	65535	65535	NULL	NULL	NULL	latin1	latin1_swedish_ci	text			select,insert,update,references		NEVER	NULL
+def	test	t1	e	5	NULL	YES	varchar	3000	3000	NULL	NULL	NULL	latin1	latin1_swedish_ci	varchar(3000)	MUL		select,insert,update,references		NEVER	NULL
+def	test	t1	f	6	NULL	YES	longblob	4294967295	4294967295	NULL	NULL	NULL	NULL	NULL	longblob			select,insert,update,references		NEVER	NULL
+def	test	t1	g	7	NULL	YES	int	NULL	NULL	10	0	NULL	NULL	NULL	int(11)			select,insert,update,references		NEVER	NULL
+def	test	t1	h	8	NULL	YES	text	65535	65535	NULL	NULL	NULL	latin1	latin1_swedish_ci	text			select,insert,update,references		NEVER	NULL
+select * from information_schema.statistics where table_schema = 'test' and table_name = 't1';
+TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	NON_UNIQUE	INDEX_SCHEMA	INDEX_NAME	SEQ_IN_INDEX	COLUMN_NAME	COLLATION	CARDINALITY	SUB_PART	PACKED	NULLABLE	INDEX_TYPE	COMMENT	INDEX_COMMENT
+def	test	t1	0	test	a	1	a	A	NULL	NULL	NULL	YES	HASH		
+def	test	t1	0	test	a	2	b	A	NULL	NULL	NULL	YES	HASH		
+def	test	t1	0	test	a	3	c	A	NULL	NULL	NULL	YES	HASH		
+def	test	t1	0	test	c	1	c	A	NULL	NULL	NULL	YES	HASH		
+def	test	t1	0	test	c	2	d	A	NULL	NULL	NULL	YES	HASH		
+def	test	t1	0	test	c	3	e	A	NULL	NULL	NULL	YES	HASH		
+def	test	t1	0	test	e	1	e	A	NULL	NULL	NULL	YES	HASH		
+def	test	t1	0	test	e	2	f	A	NULL	NULL	NULL	YES	HASH		
+def	test	t1	0	test	e	3	g	A	NULL	NULL	NULL	YES	HASH		
+def	test	t1	0	test	e	4	h	A	NULL	NULL	NULL	YES	HASH		
+def	test	t1	0	test	b	1	b	A	NULL	NULL	NULL	YES	HASH		
+def	test	t1	0	test	b	2	d	A	NULL	NULL	NULL	YES	HASH		
+def	test	t1	0	test	b	3	g	A	NULL	NULL	NULL	YES	HASH		
+def	test	t1	0	test	b	4	h	A	NULL	NULL	NULL	YES	HASH		
+select * from information_schema.key_column_usage where table_schema= 'test' and table_name= 't1';
+CONSTRAINT_CATALOG	CONSTRAINT_SCHEMA	CONSTRAINT_NAME	TABLE_CATALOG	TABLE_SCHEMA	TABLE_NAME	COLUMN_NAME	ORDINAL_POSITION	POSITION_IN_UNIQUE_CONSTRAINT	REFERENCED_TABLE_SCHEMA	REFERENCED_TABLE_NAME	REFERENCED_COLUMN_NAME
+def	test	a	def	test	t1	a	1	NULL	NULL	NULL	NULL
+def	test	a	def	test	t1	b	2	NULL	NULL	NULL	NULL
+def	test	a	def	test	t1	c	3	NULL	NULL	NULL	NULL
+def	test	c	def	test	t1	c	1	NULL	NULL	NULL	NULL
+def	test	c	def	test	t1	d	2	NULL	NULL	NULL	NULL
+def	test	c	def	test	t1	e	3	NULL	NULL	NULL	NULL
+def	test	e	def	test	t1	e	1	NULL	NULL	NULL	NULL
+def	test	e	def	test	t1	f	2	NULL	NULL	NULL	NULL
+def	test	e	def	test	t1	g	3	NULL	NULL	NULL	NULL
+def	test	e	def	test	t1	h	4	NULL	NULL	NULL	NULL
+def	test	b	def	test	t1	b	1	NULL	NULL	NULL	NULL
+def	test	b	def	test	t1	d	2	NULL	NULL	NULL	NULL
+def	test	b	def	test	t1	g	3	NULL	NULL	NULL	NULL
+def	test	b	def	test	t1	h	4	NULL	NULL	NULL	NULL
+# table select we should not be able to see db_row_hash_1 column;
+select * from t1 order by a;
+a	b	c	d	e	f	g	h
+NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL
+NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL
+1	1	1	1	1	1	1	1
+2	2	2	2	2	2	2	2
+3	3	3	3	3	3	3	3
+4	4	4	4	4	4	4	4
+5	5	5	5	5	5	5	5
+maria	6	maria	maria	maria	maria	6	maria
+mariadb	7	mariadb	mariadb	mariadb	mariadb	8	mariadb
+select db_row_hash_1 from t1;
+ERROR 42S22: Unknown column 'db_row_hash_1' in 'field list'
+select db_row_hash_2 from t1;
+ERROR 42S22: Unknown column 'db_row_hash_2' in 'field list'
+select db_row_hash_3 from t1;
+ERROR 42S22: Unknown column 'db_row_hash_3' in 'field list'
+#duplicate entry test;
+#duplicate keys entry;
+insert into t1 values(1,1,1,0,0,0,0,0);
+ERROR 23000: Duplicate entry '1-1-1' for key 'a'
+insert into t1 values(0,0,1,1,1,0,0,0);
+ERROR 23000: Duplicate entry '1-1-1' for key 'c'
+insert into t1 values(0,0,0,0,1,1,1,1);
+ERROR 23000: Duplicate entry '1-1-1-1' for key 'e'
+insert into t1 values(1,1,1,1,1,0,0,0);
+ERROR 23000: Duplicate entry '1-1-1' for key 'a'
+insert into t1 values(0,0,0,0,1,1,1,1);
+ERROR 23000: Duplicate entry '1-1-1-1' for key 'e'
+insert into t1 values(1,1,1,1,1,1,1,1);
+ERROR 23000: Duplicate entry '1-1-1' for key 'a'
+select db_row_hash_1,db_row_hash_2,db_row_hash_3,db_row_hash_4,db_row_hash_5 from t1;
+ERROR 42S22: Unknown column 'db_row_hash_1' in 'field list'
+alter table t1 drop column db_row_hash_1, drop column db_row_hash_2, drop column db_row_hash_3;
+ERROR 42000: Can't DROP COLUMN `db_row_hash_1`; check that it exists
+alter table t1 add column dg int , add column ef int , drop column db_row_hash_1;
+ERROR 42000: Can't DROP COLUMN `db_row_hash_1`; check that it exists
+alter table t1 modify column db_row_hash_1 int , modify column db_row_hash_2 int, modify column db_row_hash_3 int;
+ERROR 42S22: Unknown column 'db_row_hash_1' in 't1'
+alter table t1 add column ar int , add column rb int, modify column db_row_hash_1 int , modify column db_row_hash_3 int;
+ERROR 42S22: Unknown column 'db_row_hash_1' in 't1'
+alter table t1 change column db_row_hash_1 dsds int , change column  db_row_hash_2  dfdf int , change column db_row_hash_3 gdfg int ;
+ERROR 42S22: Unknown column 'db_row_hash_1' in 't1'
+alter table t1 add column asd int, drop column a, change column db_row_hash_1 dsds int, change db_row_hash_3 fdfdfd int;
+ERROR 42S22: Unknown column 'db_row_hash_1' in 't1'
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` blob DEFAULT NULL,
+  `b` int(11) DEFAULT NULL,
+  `c` varchar(2000) DEFAULT NULL,
+  `d` text DEFAULT NULL,
+  `e` varchar(3000) DEFAULT NULL,
+  `f` longblob DEFAULT NULL,
+  `g` int(11) DEFAULT NULL,
+  `h` text DEFAULT NULL,
+  UNIQUE KEY `a` (`a`,`b`,`c`) USING HASH,
+  UNIQUE KEY `c` (`c`,`d`,`e`) USING HASH,
+  UNIQUE KEY `e` (`e`,`f`,`g`,`h`) USING HASH,
+  UNIQUE KEY `b` (`b`,`d`,`g`,`h`) USING HASH
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+# add column named db_row_hash_*;
+alter table t1 add column db_row_hash_7 int , add column db_row_hash_5 int,
+add column db_row_hash_1 int, add column db_row_hash_2 int;
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` blob DEFAULT NULL,
+  `b` int(11) DEFAULT NULL,
+  `c` varchar(2000) DEFAULT NULL,
+  `d` text DEFAULT NULL,
+  `e` varchar(3000) DEFAULT NULL,
+  `f` longblob DEFAULT NULL,
+  `g` int(11) DEFAULT NULL,
+  `h` text DEFAULT NULL,
+  `db_row_hash_7` int(11) DEFAULT NULL,
+  `db_row_hash_5` int(11) DEFAULT NULL,
+  `db_row_hash_1` int(11) DEFAULT NULL,
+  `db_row_hash_2` int(11) DEFAULT NULL,
+  UNIQUE KEY `a` (`a`,`b`,`c`) USING HASH,
+  UNIQUE KEY `c` (`c`,`d`,`e`) USING HASH,
+  UNIQUE KEY `e` (`e`,`f`,`g`,`h`) USING HASH,
+  UNIQUE KEY `b` (`b`,`d`,`g`,`h`) USING HASH
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+show keys from t1;
+Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment	Index_comment
+t1	0	a	1	a	A	NULL	NULL	NULL	YES	HASH		
+t1	0	a	2	b	A	NULL	NULL	NULL	YES	HASH		
+t1	0	a	3	c	A	NULL	NULL	NULL	YES	HASH		
+t1	0	c	1	c	A	NULL	NULL	NULL	YES	HASH		
+t1	0	c	2	d	A	NULL	NULL	NULL	YES	HASH		
+t1	0	c	3	e	A	NULL	NULL	NULL	YES	HASH		
+t1	0	e	1	e	A	NULL	NULL	NULL	YES	HASH		
+t1	0	e	2	f	A	NULL	NULL	NULL	YES	HASH		
+t1	0	e	3	g	A	NULL	NULL	NULL	YES	HASH		
+t1	0	e	4	h	A	NULL	NULL	NULL	YES	HASH		
+t1	0	b	1	b	A	NULL	NULL	NULL	YES	HASH		
+t1	0	b	2	d	A	NULL	NULL	NULL	YES	HASH		
+t1	0	b	3	g	A	NULL	NULL	NULL	YES	HASH		
+t1	0	b	4	h	A	NULL	NULL	NULL	YES	HASH		
+alter table t1 drop column db_row_hash_7  , drop column db_row_hash_5 ,
+drop column db_row_hash_1, drop column db_row_hash_2 ;
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` blob DEFAULT NULL,
+  `b` int(11) DEFAULT NULL,
+  `c` varchar(2000) DEFAULT NULL,
+  `d` text DEFAULT NULL,
+  `e` varchar(3000) DEFAULT NULL,
+  `f` longblob DEFAULT NULL,
+  `g` int(11) DEFAULT NULL,
+  `h` text DEFAULT NULL,
+  UNIQUE KEY `a` (`a`,`b`,`c`) USING HASH,
+  UNIQUE KEY `c` (`c`,`d`,`e`) USING HASH,
+  UNIQUE KEY `e` (`e`,`f`,`g`,`h`) USING HASH,
+  UNIQUE KEY `b` (`b`,`d`,`g`,`h`) USING HASH
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+show keys from t1;
+Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment	Index_comment
+t1	0	a	1	a	A	NULL	NULL	NULL	YES	HASH		
+t1	0	a	2	b	A	NULL	NULL	NULL	YES	HASH		
+t1	0	a	3	c	A	NULL	NULL	NULL	YES	HASH		
+t1	0	c	1	c	A	NULL	NULL	NULL	YES	HASH		
+t1	0	c	2	d	A	NULL	NULL	NULL	YES	HASH		
+t1	0	c	3	e	A	NULL	NULL	NULL	YES	HASH		
+t1	0	e	1	e	A	NULL	NULL	NULL	YES	HASH		
+t1	0	e	2	f	A	NULL	NULL	NULL	YES	HASH		
+t1	0	e	3	g	A	NULL	NULL	NULL	YES	HASH		
+t1	0	e	4	h	A	NULL	NULL	NULL	YES	HASH		
+t1	0	b	1	b	A	NULL	NULL	NULL	YES	HASH		
+t1	0	b	2	d	A	NULL	NULL	NULL	YES	HASH		
+t1	0	b	3	g	A	NULL	NULL	NULL	YES	HASH		
+t1	0	b	4	h	A	NULL	NULL	NULL	YES	HASH		
+#try to change column names;
+alter table t1 change column a aa blob , change column b bb blob , change column d dd blob;
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `aa` blob DEFAULT NULL,
+  `bb` blob DEFAULT NULL,
+  `c` varchar(2000) DEFAULT NULL,
+  `dd` blob DEFAULT NULL,
+  `e` varchar(3000) DEFAULT NULL,
+  `f` longblob DEFAULT NULL,
+  `g` int(11) DEFAULT NULL,
+  `h` text DEFAULT NULL,
+  UNIQUE KEY `a` (`aa`,`bb`,`c`) USING HASH,
+  UNIQUE KEY `c` (`c`,`dd`,`e`) USING HASH,
+  UNIQUE KEY `e` (`e`,`f`,`g`,`h`) USING HASH,
+  UNIQUE KEY `b` (`bb`,`dd`,`g`,`h`) USING HASH
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+show keys from t1;
+Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment	Index_comment
+t1	0	a	1	aa	A	NULL	NULL	NULL	YES	HASH		
+t1	0	a	2	bb	A	NULL	NULL	NULL	YES	HASH		
+t1	0	a	3	c	A	NULL	NULL	NULL	YES	HASH		
+t1	0	c	1	c	A	NULL	NULL	NULL	YES	HASH		
+t1	0	c	2	dd	A	NULL	NULL	NULL	YES	HASH		
+t1	0	c	3	e	A	NULL	NULL	NULL	YES	HASH		
+t1	0	e	1	e	A	NULL	NULL	NULL	YES	HASH		
+t1	0	e	2	f	A	NULL	NULL	NULL	YES	HASH		
+t1	0	e	3	g	A	NULL	NULL	NULL	YES	HASH		
+t1	0	e	4	h	A	NULL	NULL	NULL	YES	HASH		
+t1	0	b	1	bb	A	NULL	NULL	NULL	YES	HASH		
+t1	0	b	2	dd	A	NULL	NULL	NULL	YES	HASH		
+t1	0	b	3	g	A	NULL	NULL	NULL	YES	HASH		
+t1	0	b	4	h	A	NULL	NULL	NULL	YES	HASH		
+alter table t1 change column aa a blob , change column bb b blob , change column dd d blob;
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` blob DEFAULT NULL,
+  `b` blob DEFAULT NULL,
+  `c` varchar(2000) DEFAULT NULL,
+  `d` blob DEFAULT NULL,
+  `e` varchar(3000) DEFAULT NULL,
+  `f` longblob DEFAULT NULL,
+  `g` int(11) DEFAULT NULL,
+  `h` text DEFAULT NULL,
+  UNIQUE KEY `a` (`a`,`b`,`c`) USING HASH,
+  UNIQUE KEY `c` (`c`,`d`,`e`) USING HASH,
+  UNIQUE KEY `e` (`e`,`f`,`g`,`h`) USING HASH,
+  UNIQUE KEY `b` (`b`,`d`,`g`,`h`) USING HASH
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+show keys from t1;
+Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment	Index_comment
+t1	0	a	1	a	A	NULL	NULL	NULL	YES	HASH		
+t1	0	a	2	b	A	NULL	NULL	NULL	YES	HASH		
+t1	0	a	3	c	A	NULL	NULL	NULL	YES	HASH		
+t1	0	c	1	c	A	NULL	NULL	NULL	YES	HASH		
+t1	0	c	2	d	A	NULL	NULL	NULL	YES	HASH		
+t1	0	c	3	e	A	NULL	NULL	NULL	YES	HASH		
+t1	0	e	1	e	A	NULL	NULL	NULL	YES	HASH		
+t1	0	e	2	f	A	NULL	NULL	NULL	YES	HASH		
+t1	0	e	3	g	A	NULL	NULL	NULL	YES	HASH		
+t1	0	e	4	h	A	NULL	NULL	NULL	YES	HASH		
+t1	0	b	1	b	A	NULL	NULL	NULL	YES	HASH		
+t1	0	b	2	d	A	NULL	NULL	NULL	YES	HASH		
+t1	0	b	3	g	A	NULL	NULL	NULL	YES	HASH		
+t1	0	b	4	h	A	NULL	NULL	NULL	YES	HASH		
+#now we will change the data type to int and varchar limit so that we no longer  require hash_index;
+#on key a_b_c;
+alter table t1 modify column a varchar(20) , modify column b varchar(20) , modify column c varchar(20);
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` varchar(20) DEFAULT NULL,
+  `b` varchar(20) DEFAULT NULL,
+  `c` varchar(20) DEFAULT NULL,
+  `d` blob DEFAULT NULL,
+  `e` varchar(3000) DEFAULT NULL,
+  `f` longblob DEFAULT NULL,
+  `g` int(11) DEFAULT NULL,
+  `h` text DEFAULT NULL,
+  UNIQUE KEY `a` (`a`,`b`,`c`),
+  UNIQUE KEY `c` (`c`,`d`,`e`) USING HASH,
+  UNIQUE KEY `e` (`e`,`f`,`g`,`h`) USING HASH,
+  UNIQUE KEY `b` (`b`,`d`,`g`,`h`) USING HASH
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+show keys from t1;
+Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment	Index_comment
+t1	0	a	1	a	A	NULL	NULL	NULL	YES	BTREE		
+t1	0	a	2	b	A	NULL	NULL	NULL	YES	BTREE		
+t1	0	a	3	c	A	NULL	NULL	NULL	YES	BTREE		
+t1	0	c	1	c	A	NULL	NULL	NULL	YES	HASH		
+t1	0	c	2	d	A	NULL	NULL	NULL	YES	HASH		
+t1	0	c	3	e	A	NULL	NULL	NULL	YES	HASH		
+t1	0	e	1	e	A	NULL	NULL	NULL	YES	HASH		
+t1	0	e	2	f	A	NULL	NULL	NULL	YES	HASH		
+t1	0	e	3	g	A	NULL	NULL	NULL	YES	HASH		
+t1	0	e	4	h	A	NULL	NULL	NULL	YES	HASH		
+t1	0	b	1	b	A	NULL	NULL	NULL	YES	HASH		
+t1	0	b	2	d	A	NULL	NULL	NULL	YES	HASH		
+t1	0	b	3	g	A	NULL	NULL	NULL	YES	HASH		
+t1	0	b	4	h	A	NULL	NULL	NULL	YES	HASH		
+#change it back;
+alter table t1 modify column a blob , modify column b blob , modify column c blob;
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` blob DEFAULT NULL,
+  `b` blob DEFAULT NULL,
+  `c` blob DEFAULT NULL,
+  `d` blob DEFAULT NULL,
+  `e` varchar(3000) DEFAULT NULL,
+  `f` longblob DEFAULT NULL,
+  `g` int(11) DEFAULT NULL,
+  `h` text DEFAULT NULL,
+  UNIQUE KEY `a` (`a`,`b`,`c`) USING HASH,
+  UNIQUE KEY `c` (`c`,`d`,`e`) USING HASH,
+  UNIQUE KEY `e` (`e`,`f`,`g`,`h`) USING HASH,
+  UNIQUE KEY `b` (`b`,`d`,`g`,`h`) USING HASH
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+show keys from t1;
+Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment	Index_comment
+t1	0	a	1	a	A	NULL	NULL	NULL	YES	HASH		
+t1	0	a	2	b	A	NULL	NULL	NULL	YES	HASH		
+t1	0	a	3	c	A	NULL	NULL	NULL	YES	HASH		
+t1	0	c	1	c	A	NULL	NULL	NULL	YES	HASH		
+t1	0	c	2	d	A	NULL	NULL	NULL	YES	HASH		
+t1	0	c	3	e	A	NULL	NULL	NULL	YES	HASH		
+t1	0	e	1	e	A	NULL	NULL	NULL	YES	HASH		
+t1	0	e	2	f	A	NULL	NULL	NULL	YES	HASH		
+t1	0	e	3	g	A	NULL	NULL	NULL	YES	HASH		
+t1	0	e	4	h	A	NULL	NULL	NULL	YES	HASH		
+t1	0	b	1	b	A	NULL	NULL	NULL	YES	HASH		
+t1	0	b	2	d	A	NULL	NULL	NULL	YES	HASH		
+t1	0	b	3	g	A	NULL	NULL	NULL	YES	HASH		
+t1	0	b	4	h	A	NULL	NULL	NULL	YES	HASH		
+#try to delete blob column in unique;
+truncate table t1;
+#now try to delete keys;
+alter table t1 drop key c, drop key e;
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` blob DEFAULT NULL,
+  `b` blob DEFAULT NULL,
+  `c` blob DEFAULT NULL,
+  `d` blob DEFAULT NULL,
+  `e` varchar(3000) DEFAULT NULL,
+  `f` longblob DEFAULT NULL,
+  `g` int(11) DEFAULT NULL,
+  `h` text DEFAULT NULL,
+  UNIQUE KEY `a` (`a`,`b`,`c`) USING HASH,
+  UNIQUE KEY `b` (`b`,`d`,`g`,`h`) USING HASH
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+show keys from t1;
+Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment	Index_comment
+t1	0	a	1	a	A	NULL	NULL	NULL	YES	HASH		
+t1	0	a	2	b	A	NULL	NULL	NULL	YES	HASH		
+t1	0	a	3	c	A	NULL	NULL	NULL	YES	HASH		
+t1	0	b	1	b	A	NULL	NULL	NULL	YES	HASH		
+t1	0	b	2	d	A	NULL	NULL	NULL	YES	HASH		
+t1	0	b	3	g	A	NULL	NULL	NULL	YES	HASH		
+t1	0	b	4	h	A	NULL	NULL	NULL	YES	HASH		
+drop table t1;
+#now alter table containing some data basically some tests with ignore;
+create table t1 (a blob);
+insert into t1 values(1),(2),(3);
+#normal alter table;
+alter table t1 add unique key(a);
+alter table t1 drop key a;
+truncate table t1;
+insert into t1 values(1),(1),(2),(2),(3);
+alter table t1 add unique key(a);
+ERROR 23000: Duplicate entry '1' for key 'a'
+alter ignore table t1 add unique key(a);
+select * from t1 order by a;
+a
+1
+2
+3
+insert into t1 values(1);
+ERROR 23000: Duplicate entry '1' for key 'a'
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` blob DEFAULT NULL,
+  UNIQUE KEY `a` (`a`) USING HASH
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+show keys from t1;
+Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment	Index_comment
+t1	0	a	1	a	A	NULL	NULL	NULL	YES	HASH		
+drop table t1;
+#Now with multiple keys;
+create table t1(a blob , b blob, c blob , d blob , e int);
+insert into t1 values (1,1,1,1,1);
+insert into t1 values (1,1,1,1,1);
+insert into t1 values (2,1,1,1,1);
+insert into t1 values (2,2,2,2,2);
+insert into t1 values (3,3,4,4,4);
+insert into t1 values (4,4,4,4,4);
+alter table t1 add unique key(a,c), add unique key(b,d), add unique key(e);
+ERROR 23000: Duplicate entry '1-1' for key 'a'
+alter ignore  table t1 add unique key(a,c), add unique key(b,d), add unique key(e);
+select * from t1 order by a;
+a	b	c	d	e
+1	1	1	1	1
+2	2	2	2	2
+3	3	4	4	4
+insert into t1 values (1,12,1,13,14);
+ERROR 23000: Duplicate entry '1-1' for key 'a'
+insert into t1 values (12,1,14,1,14);
+ERROR 23000: Duplicate entry '1-1' for key 'b'
+insert into t1 values (13,12,13,14,4);
+ERROR 23000: Duplicate entry '4' for key 'e'
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` blob DEFAULT NULL,
+  `b` blob DEFAULT NULL,
+  `c` blob DEFAULT NULL,
+  `d` blob DEFAULT NULL,
+  `e` int(11) DEFAULT NULL,
+  UNIQUE KEY `a` (`a`,`c`) USING HASH,
+  UNIQUE KEY `b` (`b`,`d`) USING HASH,
+  UNIQUE KEY `e` (`e`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+show keys from t1;
+Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment	Index_comment
+t1	0	a	1	a	A	NULL	NULL	NULL	YES	HASH		
+t1	0	a	2	c	A	NULL	NULL	NULL	YES	HASH		
+t1	0	b	1	b	A	NULL	NULL	NULL	YES	HASH		
+t1	0	b	2	d	A	NULL	NULL	NULL	YES	HASH		
+t1	0	e	1	e	A	0	NULL	NULL	YES	BTREE		
+drop table t1;
+#visibility of db_row_hash 
+create table t1 (a blob unique , b blob unique);
+desc t1;
+Field	Type	Null	Key	Default	Extra
+a	blob	YES	UNI	NULL	
+b	blob	YES	UNI	NULL	
+insert into t1 values(1,19);
+insert into t1 values(2,29);
+insert into t1 values(3,39);
+insert into t1 values(4,49);
+create table t2 (DB_ROW_HASH_1 int, DB_ROW_HASH_2 int);
+insert into t2 values(11,1);
+insert into t2 values(22,2);
+insert into t2 values(33,3);
+insert into t2 values(44,4);
+select * from t1 order by a;
+a	b
+1	19
+2	29
+3	39
+4	49
+select * from t2 order by DB_ROW_HASH_1;
+DB_ROW_HASH_1	DB_ROW_HASH_2
+11	1
+22	2
+33	3
+44	4
+select DB_ROW_HASH_1, DB_ROW_HASH_2 from t1;
+ERROR 42S22: Unknown column 'DB_ROW_HASH_1' in 'field list'
+#bug
+select DB_ROW_HASH_1, DB_ROW_HASH_2 from t1,t2;
+DB_ROW_HASH_1	DB_ROW_HASH_2
+11	1
+11	1
+11	1
+11	1
+22	2
+22	2
+22	2
+22	2
+33	3
+33	3
+33	3
+33	3
+44	4
+44	4
+44	4
+44	4
+select * from t1 where DB_ROW_HASH_1 in (select DB_ROW_HASH_1 from t2);
+ERROR 42S22: Unknown column 'DB_ROW_HASH_1' in 'IN/ALL/ANY subquery'
+select DB_ROW_HASH_1, DB_ROW_HASH_2 from t1,t2 where DB_ROW_HASH_1 in (select DB_ROW_HASH_1 from t2);
+DB_ROW_HASH_1	DB_ROW_HASH_2
+11	1
+22	2
+33	3
+44	4
+11	1
+22	2
+33	3
+44	4
+11	1
+22	2
+33	3
+44	4
+11	1
+22	2
+33	3
+44	4
+select * from t2 where DB_ROW_HASH_1 in (select DB_ROW_HASH_1 from t1);
+DB_ROW_HASH_1	DB_ROW_HASH_2
+11	1
+22	2
+33	3
+44	4
+select DB_ROW_HASH_1 from t1,t2 where t1.DB_ROW_HASH_1 = t2.DB_ROW_HASH_2;
+ERROR 42S22: Unknown column 't1.DB_ROW_HASH_1' in 'where clause'
+select DB_ROW_HASH_1 from t1 inner join t2 on t1.a = t2.DB_ROW_HASH_2;
+DB_ROW_HASH_1
+11
+22
+33
+44
+drop table t1,t2;
+#very long blob entry;
+SET @@GLOBAL.max_allowed_packet=67108864;
+connect  'newcon', localhost, root,,;
+connection newcon;
+show variables like 'max_allowed_packet';
+Variable_name	Value
+max_allowed_packet	67108864
+create table t1(a longblob unique, b longblob , c longblob , unique(b,c));
+desc t1;
+Field	Type	Null	Key	Default	Extra
+a	longblob	YES	UNI	NULL	
+b	longblob	YES	MUL	NULL	
+c	longblob	YES		NULL	
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` longblob DEFAULT NULL,
+  `b` longblob DEFAULT NULL,
+  `c` longblob DEFAULT NULL,
+  UNIQUE KEY `a` (`a`) USING HASH,
+  UNIQUE KEY `b` (`b`,`c`) USING HASH
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+show keys from t1;
+Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment	Index_comment
+t1	0	a	1	a	A	NULL	NULL	NULL	YES	HASH		
+t1	0	b	1	b	A	NULL	NULL	NULL	YES	HASH		
+t1	0	b	2	c	A	NULL	NULL	NULL	YES	HASH		
+insert into t1 values(concat(repeat('sachin',10000000),'1'),concat(repeat('sachin',10000000),'1'),
+concat(repeat('sachin',10000000),'1'));
+insert into t1 values(concat(repeat('sachin',10000000),'2'),concat(repeat('sachin',10000000),'2'),
+concat(repeat('sachin',10000000),'1'));
+insert into t1 values(concat(repeat('sachin',10000000),'2'),concat(repeat('sachin',10000000),'2'),
+concat(repeat('sachin',10000000),'4'));
+ERROR 23000: Duplicate entry 'sachinsachinsachinsachinsachinsachinsachinsachinsachinsachinsach' for key 'a'
+insert into t1 values(concat(repeat('sachin',10000000),'3'),concat(repeat('sachin',10000000),'1'),
+concat(repeat('sachin',10000000),'1'));
+ERROR 23000: Duplicate entry 'sachinsachinsachinsachinsachinsachinsachinsachinsachinsachinsach' for key 'b'
+drop table t1;
+#long key unique with different key length
+create table t1(a blob, unique(a(3000)));
+desc t1;
+Field	Type	Null	Key	Default	Extra
+a	blob	YES	UNI	NULL	
+show keys from t1;
+Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment	Index_comment
+t1	0	a	1	a	A	NULL	3000	NULL	YES	HASH		
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` blob DEFAULT NULL,
+  UNIQUE KEY `a` (`a`(3000)) USING HASH
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+insert into t1 value(concat(repeat('s',3000),'1'));
+insert into t1 value(concat(repeat('s',3000),'2'));
+ERROR 23000: Duplicate entry 'ssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss' for key 'a'
+insert into t1 value(concat(repeat('a',3000),'2'));
+drop table t1;
+create table t1(a varchar(4000), b longblob , c varchar(5000), d longblob, 
+unique(a(3500), b), unique(c(4500), d));
+desc t1;
+Field	Type	Null	Key	Default	Extra
+a	varchar(4000)	YES	MUL	NULL	
+b	longblob	YES		NULL	
+c	varchar(5000)	YES	MUL	NULL	
+d	longblob	YES		NULL	
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` varchar(4000) DEFAULT NULL,
+  `b` longblob DEFAULT NULL,
+  `c` varchar(5000) DEFAULT NULL,
+  `d` longblob DEFAULT NULL,
+  UNIQUE KEY `a` (`a`(3500),`b`) USING HASH,
+  UNIQUE KEY `c` (`c`(4500),`d`) USING HASH
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+show keys from t1;
+Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment	Index_comment
+t1	0	a	1	a	A	NULL	3500	NULL	YES	HASH		
+t1	0	a	2	b	A	NULL	NULL	NULL	YES	HASH		
+t1	0	c	1	c	A	NULL	4500	NULL	YES	HASH		
+t1	0	c	2	d	A	NULL	NULL	NULL	YES	HASH		
+drop table t1;
+disconnect newcon;
+connection default;
+SET @@GLOBAL.max_allowed_packet=4194304;
+#ext bug
+create table t1(a int primary key, b blob unique, c int, d blob , index(c));
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` int(11) NOT NULL,
+  `b` blob DEFAULT NULL,
+  `c` int(11) DEFAULT NULL,
+  `d` blob DEFAULT NULL,
+  PRIMARY KEY (`a`),
+  UNIQUE KEY `b` (`b`) USING HASH,
+  KEY `c` (`c`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+insert into t1 values(1,23,1,33);
+insert into t1 values(2,23,1,33);
+ERROR 23000: Duplicate entry '23' for key 'b'
+drop table t1;
+create table t2 (a blob unique , c int , index(c));
+show create table t2;
+Table	Create Table
+t2	CREATE TABLE `t2` (
+  `a` blob DEFAULT NULL,
+  `c` int(11) DEFAULT NULL,
+  UNIQUE KEY `a` (`a`) USING HASH,
+  KEY `c` (`c`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+insert into t2 values(1,1);
+insert into t2 values(2,1);
+drop table t2;
+#not null test
+create table t1(a blob unique not null);
+desc t1;
+Field	Type	Null	Key	Default	Extra
+a	blob	NO	UNI	NULL	
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` blob NOT NULL,
+  UNIQUE KEY `a` (`a`) USING HASH
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+insert into t1 values(1);
+insert into t1 values(3);
+insert into t1 values(1);
+ERROR 23000: Duplicate entry '1' for key 'a'
+drop table t1;
+create table t1(a int primary key, b blob unique , c blob unique not null);
+insert into t1 values(1,1,1);
+insert into t1 values(2,1,2);
+ERROR 23000: Duplicate entry '1' for key 'b'
+insert into t1 values(3,3,1);
+ERROR 23000: Duplicate entry '1' for key 'c'
+drop table t1;
+create table t1 (a blob unique not null, b blob not null, c blob not null, unique(b,c));
+desc t1;
+Field	Type	Null	Key	Default	Extra
+a	blob	NO	UNI	NULL	
+b	blob	NO	MUL	NULL	
+c	blob	NO		NULL	
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` blob NOT NULL,
+  `b` blob NOT NULL,
+  `c` blob NOT NULL,
+  UNIQUE KEY `a` (`a`) USING HASH,
+  UNIQUE KEY `b` (`b`,`c`) USING HASH
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+insert into t1 values (1, 2, 3);
+insert into t1 values (2, 1, 3);
+insert into t1 values (2, 1, 3);
+ERROR 23000: Duplicate entry '2' for key 'a'
+drop table t1;
+#partition
+create table t1(a blob unique) partition by hash(a);
+ERROR HY000: A BLOB field is not allowed in partition function
+#key length > 2^16 -1
+create table t1(a blob, unique(a(65536)));
+ERROR HY000: Max key segment length is 65535
+create table t1(a blob, unique(a(65535)));
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` blob DEFAULT NULL,
+  UNIQUE KEY `a` (`a`) USING HASH
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+drop table t1;
+#64 indexes
+create table t1 ( a63 blob unique, a62 blob unique, a61 blob unique, a60 blob unique, a59 blob unique, a58 blob unique, a57 blob unique, a56 blob unique, a55 blob unique, a54 blob unique, a53 blob unique, a52 blob unique, a51 blob unique, a50 blob unique, a49 blob unique, a48 blob unique, a47 blob unique, a46 blob unique, a45 blob unique, a44 blob unique, a43 blob unique, a42 blob unique, a41 blob unique, a40 blob unique, a39 blob unique, a38 blob unique, a37 blob unique, a36 blob unique, a35 blob unique, a34 blob unique, a33 blob unique, a32 blob unique, a31 blob unique, a30 blob unique, a29 blob unique, a28 blob unique, a27 blob unique, a26 blob unique, a25 blob unique, a24 blob unique, a23 blob unique, a22 blob unique, a21 blob unique, a20 blob unique, a19 blob unique, a18 blob unique, a17 blob unique, a16 blob unique, a15 blob unique, a14 blob unique, a13 blob unique, a12 blob unique, a11 blob unique, a10 blob unique, a9 blob unique, a8 blob unique, a7 blob unique, a6 blob unique, a5 blob unique, a4 blob unique, a3 blob unique, a2 blob unique, a1 blob unique, a blob unique);;
+insert into t1 values( 63, 62, 61, 60, 59, 58, 57, 56, 55, 54, 53, 52, 51, 50, 49, 48, 47, 46, 45, 44, 43, 42, 41, 40, 39, 38, 37, 36, 35, 34, 33, 32, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0);;
+insert into t1 values( 63, 62, 61, 60, 59, 58, 57, 56, 55, 54, 53, 52, 51, 50, 49, 48, 47, 46, 45, 44, 43, 42, 41, 40, 39, 38, 37, 36, 35, 34, 33, 32, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0);;
+ERROR 23000: Duplicate entry '63' for key 'a63'
+insert into t1 values( 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63);;
+insert into t1 values( 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63);;
+ERROR 23000: Duplicate entry '0' for key 'a63'
+drop table t1;
+set @@GLOBAL.max_allowed_packet= @allowed_packet;
diff --git a/mysql-test/main/long_unique.test b/mysql-test/main/long_unique.test
new file mode 100644
index 00000000000..11ab5038809
--- /dev/null
+++ b/mysql-test/main/long_unique.test
@@ -0,0 +1,511 @@
+let datadir=`select @@datadir`;
+--source include/have_partition.inc
+
+--echo #Structure of tests
+--echo #First we will check all option for
+--echo #table containing single unique column
+--echo #table containing keys like unique(a,b,c,d) etc
+--echo #then table containing 2 blob unique etc
+set @allowed_packet= @@max_allowed_packet;
+--echo #table with single long blob column;
+create table t1(a blob  unique );
+insert into t1 values(1),(2),(3),(56),('sachin'),('maria'),(123456789034567891),(null),(null),(123456789034567890);
+--echo #blob with primary key not allowed
+--error ER_TOO_LONG_KEY
+create table t2(a blob,primary key(a(10000)));
+--error ER_TOO_LONG_KEY
+create table t3(a varchar(10000) primary key);
+
+--error ER_DUP_ENTRY
+insert into t1 values(2);
+--echo #table structure;
+desc t1;
+show create table t1;
+query_vertical show keys from t1;
+replace_result $datadir DATADIR;
+exec $MYISAMCHK -d $datadir/test/t1;
+select * from information_schema.columns where table_schema = 'test' and table_name = 't1';
+select * from information_schema.statistics where table_schema = 'test' and table_name = 't1';
+query_vertical select   * from information_schema.key_column_usage where table_schema= 'test' and table_name= 't1';
+--echo # table select we should not be able to see db_row_hash_column;
+select * from t1 order by a;
+--error ER_BAD_FIELD_ERROR
+select db_row_hash_1 from t1;
+--echo #duplicate entry test;
+--error ER_DUP_ENTRY
+insert into t1 values(2);
+--error ER_DUP_ENTRY
+insert into t1 values('sachin');
+--error ER_DUP_ENTRY
+insert into t1 values(123456789034567891);
+select * from t1 order by a;
+insert into t1 values(11),(22),(33);
+--error ER_DUP_ENTRY
+insert into t1 values(12),(22);
+select * from t1 order by a;
+insert into t1 values(repeat('s',4000*10)),(repeat('s',4001*10));
+--error ER_DUP_ENTRY
+insert into t1 values(repeat('m',4000*10)),(repeat('m',4000*10));
+insert into t1 values(repeat('m',4001)),(repeat('m',4002));
+truncate table t1;
+insert into t1 values(1),(2),(3),(4),(5),(8),(7);
+replace_result $datadir DATADIR;
+exec $MYISAMCHK -d $datadir/test/t1;
+--echo #now some alter commands;
+alter table t1 add column b int;
+desc t1;
+show create table t1;
+--error ER_DUP_ENTRY
+insert into t1 values(1,2);
+--error ER_DUP_ENTRY
+insert into t1 values(2,2);
+--error ER_BAD_FIELD_ERROR
+select db_row_hash_1 from t1;
+--echo #now try to change db_row_hash_1 column;
+--error ER_CANT_DROP_FIELD_OR_KEY
+alter table t1 drop column db_row_hash_1;
+--error ER_CANT_DROP_FIELD_OR_KEY
+alter table t1 add column d int , add column e int , drop column db_row_hash_1;
+--error ER_BAD_FIELD_ERROR
+alter table t1 modify column db_row_hash_1 int ;
+--error ER_BAD_FIELD_ERROR
+alter table t1 add column a int , add column b int, modify column db_row_hash_1 int ;
+--error ER_BAD_FIELD_ERROR
+alter table t1 change column db_row_hash_1 dsds int;
+--error ER_BAD_FIELD_ERROR
+alter table t1 add column asd int, change column db_row_hash_1 dsds int;
+alter table t1 drop column b , add column c int;
+show create table t1;
+
+--echo #now add some column with name db_row_hash;
+alter table t1 add column db_row_hash_1 int unique;
+show create table t1;
+--error ER_DUP_ENTRY
+insert into t1 values(45,1,55),(46,1,55);
+--error ER_DUP_ENTRY
+insert into t1 values(45,1,55),(45,1,55);
+alter table t1 add column db_row_hash_2 int, add column db_row_hash_3 int;
+desc t1;
+--echo #this should also drop the unique index ;
+alter table t1 drop column a;
+show create table t1;
+show keys from t1;
+--echo #add column with unique index on blob ;
+alter table t1 add column a blob unique;
+show create table t1;
+--echo # try to change the blob unique name;
+alter table t1 change column a aa blob ;
+show create table t1;
+show keys from t1;
+--echo # try to change the blob unique datatype;
+--echo #this will change index to b tree;
+alter table t1 modify  column aa  int ;
+show create table t1;
+show keys from t1;
+alter table t1 add column clm blob unique;
+--echo #try changing the name ;
+alter table t1 change column clm clm_changed blob;
+show create table t1;
+show keys from t1;
+--echo #now drop the unique key;
+alter table t1 drop key clm;
+show create table t1;
+show keys from t1;
+drop table t1;
+
+create table t1 (a TEXT CHARSET latin1 COLLATE latin1_german2_ci unique);
+desc t1;
+show keys from t1;
+ insert into t1 values ('ae');
+--error ER_DUP_ENTRY
+insert into t1 values ('AE');
+insert  into t1 values ('Ä');
+drop table t1;
+create table t1 (a int primary key, b blob unique);
+desc t1;
+show keys from t1;
+insert into t1 values(1,1),(2,2),(3,3);
+--error ER_DUP_ENTRY
+insert into t1 values(1,1);
+--error ER_DUP_ENTRY
+insert into t1 values(7,1);
+drop table t1;
+
+--echo #table with multiple  long blob column and varchar text column ;
+create table t1(a blob unique, b int , c blob unique , d text unique , e varchar(3000) unique);
+insert into t1 values(1,2,3,4,5),(2,11,22,33,44),(3111,222,333,444,555),(5611,2222,3333,4444,5555),
+('sachin',341,'fdf','gfgfgfg','hghgr'),('maria',345,'frter','dasd','utyuty'),
+(123456789034567891,353534,53453453453456,64565464564564,45435345345345),
+(123456789034567890,43545,657567567567,78967657567567,657567567567567676);
+
+--echo #table structure;
+desc t1;
+show create table t1;
+show keys from t1;
+replace_result $datadir DATADIR;
+exec $MYISAMCHK -d $datadir/test/t1;
+select * from information_schema.columns where table_schema = 'test' and table_name = 't1';
+select * from information_schema.statistics where table_schema = 'test' and table_name = 't1';
+select * from information_schema.key_column_usage where table_schema= 'test' and table_name= 't1';
+--echo #table select we should not be able to see db_row_hash_1 column;
+select * from t1 order by a;
+--error ER_BAD_FIELD_ERROR
+select db_row_hash_1 from t1;
+--error ER_BAD_FIELD_ERROR
+select db_row_hash_2 from t1;
+--error ER_BAD_FIELD_ERROR
+select db_row_hash_3 from t1;
+--echo #duplicate entry test;
+--error ER_DUP_ENTRY
+insert into t1 values(21,2,3,42,51);
+--error ER_DUP_ENTRY
+insert into t1 values('sachin',null,null,null,null);
+--error ER_DUP_ENTRY
+insert into t1 values(1234567890345671890,4353451,6575675675617,789676575675617,657567567567567676);
+select * from t1 order by a;
+insert into t1 values(repeat('s',4000*10),100,repeat('s',4000*10),repeat('s',4000*10),
+repeat('s',400)),(repeat('s',4001*10),1000,repeat('s',4001*10),repeat('s',4001*10),
+repeat('s',2995));
+--error ER_DUP_ENTRY
+insert into t1 values(repeat('m',4000*11),10,repeat('s',4000*11),repeat('s',4000*11),repeat('s',2995));
+truncate table t1;
+insert into t1 values(1,2,3,4,5),(2,11,22,33,44),(3111,222,333,444,555),(5611,2222,3333,4444,5555);
+--echo #now some alter commands;
+alter table t1 add column f int;
+desc t1;
+show create table t1;
+--echo #unique key should not break;
+--error ER_DUP_ENTRY
+insert into t1 values(1,2,3,4,5,6);
+--error ER_BAD_FIELD_ERROR
+select db_row_hash_1 , db_row_hash_2, db_row_hash_3 from t1;
+--echo #now try to change db_row_hash_1 column;
+--error ER_CANT_DROP_FIELD_OR_KEY
+alter table t1 drop column db_row_hash_1, drop column db_row_hash_2, drop column db_row_hash_3;
+--error ER_CANT_DROP_FIELD_OR_KEY
+alter table t1 add column dg int , add column ef int , drop column db_row_hash_1;
+--error ER_BAD_FIELD_ERROR
+alter table t1 modify column db_row_hash_1 int , modify column db_row_hash_2 int, modify column db_row_hash_3 int;
+--error ER_BAD_FIELD_ERROR
+alter table t1 add column ar int , add column rb int, modify column db_row_hash_1 int , modify column db_row_hash_3 int;
+--error ER_BAD_FIELD_ERROR
+alter table t1 change column db_row_hash_1 dsds int , change column  db_row_hash_2  dfdf int , change column db_row_hash_3 gdfg int ;
+--error ER_BAD_FIELD_ERROR
+alter table t1 add column asd int, drop column a, change column db_row_hash_1 dsds int, change db_row_hash_3 fdfdfd int;
+alter table t1 drop column b , add column g int;
+show create table t1;
+
+--echo #now add some column with name db_row_hash;
+alter table t1 add column db_row_hash_1 int unique;
+alter table t1 add column db_row_hash_2 int unique;
+alter table t1 add column db_row_hash_3 int unique;
+show create table t1;
+
+alter table t1 add column db_row_hash_7 int, add column db_row_hash_5 int , add column db_row_hash_4 int ;
+alter table t1 drop column db_row_hash_7,drop column db_row_hash_3, drop column db_row_hash_4;
+desc t1;
+--echo #this should not break anything;
+--error ER_DUP_ENTRY
+insert into t1 values(1,2,3,4,5,6,23,5,6);
+--echo #this should also drop the unique index;
+alter table t1 drop column a, drop column c;
+show create table t1;
+show keys from t1;
+--echo #add column with unique index on blob;
+alter table t1 add column a blob unique;
+show create table t1;
+show keys from t1;
+--echo #try to change the blob unique column name;
+--echo #this will change index to b tree;
+alter table t1 modify  column a  int ,  modify column e int;
+show create table t1;
+show keys from t1;
+alter table t1 add column clm1 blob unique,add column clm2 blob unique;
+--echo #try changing the name; 
+alter table t1 change column clm1 clm_changed1 blob, change column clm2 clm_changed2 blob;
+show create table t1;
+show keys from t1;
+--echo #now drop the unique key;
+alter table t1 drop key clm1, drop key clm2;
+show create table t1;
+show keys from t1;
+drop table t1;
+--echo #now the table with key on multiple columns; the ultimate test;
+create table t1(a blob, b int , c varchar(2000) , d text  , e varchar(3000) , f longblob , g int , h text ,
+  unique(a,b,c), unique(c,d,e),unique(e,f,g,h), unique(b,d,g,h));
+
+insert into t1 values(1,1,1,1,1,1,1,1),(2,2,2,2,2,2,2,2),(3,3,3,3,3,3,3,3),(4,4,4,4,4,4,4,4),(5,5,5,5,5,5,5,5),
+('maria',6,'maria','maria','maria','maria',6,'maria'),('mariadb',7,'mariadb','mariadb','mariadb','mariadb',8,'mariadb')
+,(null,null,null,null,null,null,null,null),(null,null,null,null,null,null,null,null);
+
+--echo #table structure;
+desc t1;
+show create table t1;
+show keys from t1;
+replace_result $datadir DATADIR;
+exec $MYISAMCHK -d $datadir/test/t1;
+select * from information_schema.columns where table_schema = 'test' and table_name = 't1';
+select * from information_schema.statistics where table_schema = 'test' and table_name = 't1';
+select * from information_schema.key_column_usage where table_schema= 'test' and table_name= 't1';
+--echo # table select we should not be able to see db_row_hash_1 column;
+select * from t1 order by a;
+--error ER_BAD_FIELD_ERROR
+select db_row_hash_1 from t1;
+--error ER_BAD_FIELD_ERROR
+select db_row_hash_2 from t1;
+--error ER_BAD_FIELD_ERROR
+select db_row_hash_3 from t1;
+--echo #duplicate entry test;
+--echo #duplicate keys entry;
+--error ER_DUP_ENTRY
+insert into t1 values(1,1,1,0,0,0,0,0);
+--error ER_DUP_ENTRY
+insert into t1 values(0,0,1,1,1,0,0,0);
+--error ER_DUP_ENTRY
+insert into t1 values(0,0,0,0,1,1,1,1);
+--error ER_DUP_ENTRY
+insert into t1 values(1,1,1,1,1,0,0,0);
+--error ER_DUP_ENTRY
+insert into t1 values(0,0,0,0,1,1,1,1);
+--error ER_DUP_ENTRY
+insert into t1 values(1,1,1,1,1,1,1,1);
+--error ER_BAD_FIELD_ERROR
+select db_row_hash_1,db_row_hash_2,db_row_hash_3,db_row_hash_4,db_row_hash_5 from t1;
+--error ER_CANT_DROP_FIELD_OR_KEY
+alter table t1 drop column db_row_hash_1, drop column db_row_hash_2, drop column db_row_hash_3;
+--error ER_CANT_DROP_FIELD_OR_KEY
+alter table t1 add column dg int , add column ef int , drop column db_row_hash_1;
+--error ER_BAD_FIELD_ERROR
+alter table t1 modify column db_row_hash_1 int , modify column db_row_hash_2 int, modify column db_row_hash_3 int;
+--error ER_BAD_FIELD_ERROR
+alter table t1 add column ar int , add column rb int, modify column db_row_hash_1 int , modify column db_row_hash_3 int;
+--error ER_BAD_FIELD_ERROR
+alter table t1 change column db_row_hash_1 dsds int , change column  db_row_hash_2  dfdf int , change column db_row_hash_3 gdfg int ;
+--error ER_BAD_FIELD_ERROR
+alter table t1 add column asd int, drop column a, change column db_row_hash_1 dsds int, change db_row_hash_3 fdfdfd int;
+
+show create table t1;
+--echo # add column named db_row_hash_*;
+alter table t1 add column db_row_hash_7 int , add column db_row_hash_5 int,
+ add column db_row_hash_1 int, add column db_row_hash_2 int;
+show create table t1;
+show keys from t1;
+alter table t1 drop column db_row_hash_7  , drop column db_row_hash_5 ,
+ drop column db_row_hash_1, drop column db_row_hash_2 ;
+show create table t1;
+show keys from t1;
+
+--echo #try to change column names;
+alter table t1 change column a aa blob , change column b bb blob , change column d dd blob;
+show create table t1;
+show keys from t1;
+alter table t1 change column aa a blob , change column bb b blob , change column dd d blob;
+show create table t1;
+show keys from t1;
+
+--echo #now we will change the data type to int and varchar limit so that we no longer  require hash_index;
+--echo #on key a_b_c;
+alter table t1 modify column a varchar(20) , modify column b varchar(20) , modify column c varchar(20);
+show create table t1;
+show keys from t1;
+--echo #change it back;
+alter table t1 modify column a blob , modify column b blob , modify column c blob;
+show create table t1;
+show keys from t1;
+
+--echo #try to delete blob column in unique;
+truncate table t1;
+## this feature removed in 10.2
+#alter table t1 drop column a, drop column b, drop  column c;
+#show create table t1;
+#show keys from t1;
+--echo #now try to delete keys;
+alter table t1 drop key c, drop key e;
+show create table t1;
+show keys from t1;
+drop table t1;
+
+--echo #now alter table containing some data basically some tests with ignore;
+create table t1 (a blob);
+insert into t1 values(1),(2),(3);
+--echo #normal alter table;
+alter table t1 add unique key(a);
+alter table t1 drop key a;
+truncate table t1;
+insert into t1 values(1),(1),(2),(2),(3);
+--error ER_DUP_ENTRY
+alter table t1 add unique key(a);
+alter ignore table t1 add unique key(a);
+select * from t1 order by a;
+--error ER_DUP_ENTRY
+insert into t1 values(1);
+show create table t1;
+show keys from t1;
+drop table t1;
+
+--echo #Now with multiple keys;
+create table t1(a blob , b blob, c blob , d blob , e int);
+insert into t1 values (1,1,1,1,1);
+insert into t1 values (1,1,1,1,1);
+insert into t1 values (2,1,1,1,1);
+insert into t1 values (2,2,2,2,2);
+insert into t1 values (3,3,4,4,4);
+insert into t1 values (4,4,4,4,4);
+--error ER_DUP_ENTRY
+alter table t1 add unique key(a,c), add unique key(b,d), add unique key(e);
+alter ignore  table t1 add unique key(a,c), add unique key(b,d), add unique key(e);
+select * from t1 order by a;
+--error ER_DUP_ENTRY
+insert into t1 values (1,12,1,13,14);
+--error ER_DUP_ENTRY
+insert into t1 values (12,1,14,1,14);
+--error ER_DUP_ENTRY
+insert into t1 values (13,12,13,14,4);
+show create table t1;
+show keys from t1;
+drop table t1;
+
+--echo #visibility of db_row_hash 
+create table t1 (a blob unique , b blob unique);
+desc t1;
+insert into t1 values(1,19);
+insert into t1 values(2,29);
+insert into t1 values(3,39);
+insert into t1 values(4,49);
+create table t2 (DB_ROW_HASH_1 int, DB_ROW_HASH_2 int);
+insert into t2 values(11,1);
+insert into t2 values(22,2);
+insert into t2 values(33,3);
+insert into t2 values(44,4);
+select * from t1 order by a;
+select * from t2 order by DB_ROW_HASH_1;
+--error ER_BAD_FIELD_ERROR
+select DB_ROW_HASH_1, DB_ROW_HASH_2 from t1;
+--echo #bug
+select DB_ROW_HASH_1, DB_ROW_HASH_2 from t1,t2;
+--error ER_BAD_FIELD_ERROR
+select * from t1 where DB_ROW_HASH_1 in (select DB_ROW_HASH_1 from t2);
+select DB_ROW_HASH_1, DB_ROW_HASH_2 from t1,t2 where DB_ROW_HASH_1 in (select DB_ROW_HASH_1 from t2);
+select * from t2 where DB_ROW_HASH_1 in (select DB_ROW_HASH_1 from t1);
+--error ER_BAD_FIELD_ERROR
+select DB_ROW_HASH_1 from t1,t2 where t1.DB_ROW_HASH_1 = t2.DB_ROW_HASH_2;
+select DB_ROW_HASH_1 from t1 inner join t2 on t1.a = t2.DB_ROW_HASH_2;
+drop table t1,t2;
+
+--echo #very long blob entry;
+SET @@GLOBAL.max_allowed_packet=67108864;
+
+connect ('newcon', localhost, root,,);
+--connection newcon
+show variables like 'max_allowed_packet';
+create table t1(a longblob unique, b longblob , c longblob , unique(b,c));
+desc t1;
+show create table t1;
+show keys from t1;
+insert into t1 values(concat(repeat('sachin',10000000),'1'),concat(repeat('sachin',10000000),'1'),
+concat(repeat('sachin',10000000),'1'));
+insert into t1 values(concat(repeat('sachin',10000000),'2'),concat(repeat('sachin',10000000),'2'),
+concat(repeat('sachin',10000000),'1'));
+--error ER_DUP_ENTRY
+insert into t1 values(concat(repeat('sachin',10000000),'2'),concat(repeat('sachin',10000000),'2'),
+concat(repeat('sachin',10000000),'4'));
+--error ER_DUP_ENTRY
+insert into t1 values(concat(repeat('sachin',10000000),'3'),concat(repeat('sachin',10000000),'1'),
+concat(repeat('sachin',10000000),'1'));
+drop table t1;
+
+--echo #long key unique with different key length
+create table t1(a blob, unique(a(3000)));
+desc t1;
+show keys from t1;
+show create table t1;
+insert into t1 value(concat(repeat('s',3000),'1'));
+--error ER_DUP_ENTRY
+insert into t1 value(concat(repeat('s',3000),'2'));
+insert into t1 value(concat(repeat('a',3000),'2'));
+drop table t1;
+
+create table t1(a varchar(4000), b longblob , c varchar(5000), d longblob, 
+unique(a(3500), b), unique(c(4500), d));
+desc t1;
+show create table t1;
+show keys from t1;
+drop table t1;
+disconnect newcon;
+--connection default
+SET @@GLOBAL.max_allowed_packet=4194304;
+--echo #ext bug
+create table t1(a int primary key, b blob unique, c int, d blob , index(c));
+show create table t1;
+insert into t1 values(1,23,1,33);
+--error ER_DUP_ENTRY
+insert into t1 values(2,23,1,33);
+drop table t1;
+create table t2 (a blob unique , c int , index(c));
+show create table t2;
+insert into t2 values(1,1);
+insert into t2 values(2,1);
+drop table t2;
+--echo #not null test
+create table t1(a blob unique not null);
+desc t1;
+show create table t1;
+insert into t1 values(1);
+insert into t1 values(3);
+--error ER_DUP_ENTRY
+insert into t1 values(1);
+drop table t1;
+create table t1(a int primary key, b blob unique , c blob unique not null);
+insert into t1 values(1,1,1);
+--error ER_DUP_ENTRY
+insert into t1 values(2,1,2);
+--error ER_DUP_ENTRY
+insert into t1 values(3,3,1);
+drop table t1;
+create table t1 (a blob unique not null, b blob not null, c blob not null, unique(b,c));
+desc t1;
+show create table t1;
+insert into t1 values (1, 2, 3);
+insert into t1 values (2, 1, 3);
+--error ER_DUP_ENTRY
+insert into t1 values (2, 1, 3);
+drop table t1;
+
+--echo #partition
+--error ER_BLOB_FIELD_IN_PART_FUNC_ERROR
+create table t1(a blob unique) partition by hash(a);
+--echo #key length > 2^16 -1
+--error ER_TOO_LONG_HASH_KEYSEG
+create table t1(a blob, unique(a(65536)));
+create table t1(a blob, unique(a(65535)));
+show create table t1;
+drop table t1;
+
+--echo #64 indexes
+--let $create_table=create table t1 (
+--let $insert_data_1=insert into t1 values(
+--let $insert_data_2=insert into t1 values(
+--let $count= 63
+--let $index= 0
+while ($count)
+{
+  --let $create_table=$create_table a$count blob unique,
+  --let $insert_data_1=$insert_data_1 $count,
+  --let $insert_data_2=$insert_data_2 $index,
+  --dec $count
+  --inc $index
+}
+--let $create_table=$create_table a blob unique);
+--let $insert_data_1=$insert_data_1 0);
+--let $insert_data_2=$insert_data_2 63);
+
+--eval $create_table
+--eval $insert_data_1
+--error ER_DUP_ENTRY
+--eval $insert_data_1
+--eval $insert_data_2
+--error ER_DUP_ENTRY
+--eval $insert_data_2
+drop table t1;
+
+set @@GLOBAL.max_allowed_packet= @allowed_packet;
diff --git a/mysql-test/main/long_unique_debug.result b/mysql-test/main/long_unique_debug.result
new file mode 100644
index 00000000000..fb56a9d024b
--- /dev/null
+++ b/mysql-test/main/long_unique_debug.result
@@ -0,0 +1,579 @@
+#In this test case we will check what will happen in the case of hash collision
+SET debug_dbug="d,same_long_unique_hash";
+create table t1(a blob unique);
+FLUSH STATUS;
+insert into t1 values('xyz');
+insert into t1 values('abc');
+insert into t1 values('sachin');
+insert into t1 values('sachin');
+ERROR 23000: Duplicate entry 'sachin' for key 'a'
+insert into t1 values('maria');
+insert into t1 values('maria');
+ERROR 23000: Duplicate entry 'maria' for key 'a'
+drop table t1;
+SHOW STATUS LIKE 'handler_read_next';
+Variable_name	Value
+Handler_read_next	11
+SET debug_dbug="";
+create table t1(a blob unique);
+FLUSH STATUS;
+insert into t1 values('xyz');
+insert into t1 values('abc');
+insert into t1 values('sachin');
+insert into t1 values('sachin');
+ERROR 23000: Duplicate entry 'sachin' for key 'a'
+insert into t1 values('maria');
+insert into t1 values('maria');
+ERROR 23000: Duplicate entry 'maria' for key 'a'
+drop table t1;
+SHOW STATUS LIKE 'handler_read_next';
+Variable_name	Value
+Handler_read_next	0
+SET debug_dbug="d,same_long_unique_hash";
+create table t1(a blob unique, b blob unique);
+insert into t1 values('xyz', 11);
+insert into t1 values('abc', 22);
+insert into t1 values('sachin', 1);
+insert into t1 values('sachin', 4);
+ERROR 23000: Duplicate entry 'sachin' for key 'a'
+insert into t1 values('maria', 2);
+insert into t1 values('maria', 3);
+ERROR 23000: Duplicate entry 'maria' for key 'a'
+drop table t1;
+create table t1(a blob , b blob , unique(a,b));
+insert into t1 values('xyz', 11);
+insert into t1 values('abc', 22);
+insert into t1 values('sachin', 1);
+insert into t1 values('sachin', 1);
+ERROR 23000: Duplicate entry 'sachin-1' for key 'a'
+insert into t1 values('maria', 2);
+insert into t1 values('maria', 2);
+ERROR 23000: Duplicate entry 'maria-2' for key 'a'
+drop table t1;
+##Internal State of long unique tables
+SET debug_dbug="d,print_long_unique_internal_state";
+create table t1 ( a blob unique);
+Warnings:
+Note	1	Printing Table state, It will print table fields, fields->offset,field->null_bit, field->null_pos and key_info ... 
+
+Printing  Table  keyinfo
+
+table->s->reclength 19
+table->s->fields 2
+
+table->key_info[0] user_defined_key_parts = 1
+table->key_info[0] algorithm == HA_KEY_ALG_LONG_HASH = 1
+table->key_info[0] flags & HA_NOSAME = 0
+
+table->s->key_info[0] user_defined_key_parts = 1
+table->s->key_info[0] algorithm == HA_KEY_ALG_LONG_HASH = 1
+table->s->key_info[0] flags & HA_NOSAME = 1
+
+Printing table->key_info[0].key_part[0] info
+key_part->offset = 11
+key_part->field_name = DB_ROW_HASH_1
+key_part->length = 8
+key_part->null_bit = 2
+key_part->null_offset = 0
+
+Printing share->key_info[0].key_part[0] info
+key_part->offset = 1
+key_part->field_name = a
+key_part->length = 0
+key_part->null_bit = 1
+key_part->null_offset = 0
+
+Printing table->fields
+
+table->field[0]->field_name a
+table->field[0]->offset = 1
+table->field[0]->field_length = 10
+table->field[0]->null_pos wrt to record 0 = 0
+table->field[0]->null_bit_pos = 1
+
+table->field[1]->field_name DB_ROW_HASH_1
+table->field[1]->offset = 11
+table->field[1]->field_length = 8
+table->field[1]->null_pos wrt to record 0 = 0
+table->field[1]->null_bit_pos = 2
+
+SET debug_dbug="";
+drop table t1;
+SET debug_dbug="d,print_long_unique_internal_state";
+create table t1 ( a blob unique, b blob unique , c blob  unique);
+Warnings:
+Note	1	Printing Table state, It will print table fields, fields->offset,field->null_bit, field->null_pos and key_info ... 
+
+Printing  Table  keyinfo
+
+table->s->reclength 55
+table->s->fields 6
+
+table->key_info[0] user_defined_key_parts = 1
+table->key_info[0] algorithm == HA_KEY_ALG_LONG_HASH = 1
+table->key_info[0] flags & HA_NOSAME = 0
+
+table->s->key_info[0] user_defined_key_parts = 1
+table->s->key_info[0] algorithm == HA_KEY_ALG_LONG_HASH = 1
+table->s->key_info[0] flags & HA_NOSAME = 1
+
+Printing table->key_info[0].key_part[0] info
+key_part->offset = 31
+key_part->field_name = DB_ROW_HASH_1
+key_part->length = 8
+key_part->null_bit = 8
+key_part->null_offset = 0
+
+Printing share->key_info[0].key_part[0] info
+key_part->offset = 1
+key_part->field_name = a
+key_part->length = 0
+key_part->null_bit = 1
+key_part->null_offset = 0
+
+table->key_info[1] user_defined_key_parts = 1
+table->key_info[1] algorithm == HA_KEY_ALG_LONG_HASH = 1
+table->key_info[1] flags & HA_NOSAME = 0
+
+table->s->key_info[1] user_defined_key_parts = 1
+table->s->key_info[1] algorithm == HA_KEY_ALG_LONG_HASH = 1
+table->s->key_info[1] flags & HA_NOSAME = 1
+
+Printing table->key_info[1].key_part[0] info
+key_part->offset = 39
+key_part->field_name = DB_ROW_HASH_2
+key_part->length = 8
+key_part->null_bit = 16
+key_part->null_offset = 0
+
+Printing share->key_info[1].key_part[0] info
+key_part->offset = 11
+key_part->field_name = b
+key_part->length = 0
+key_part->null_bit = 2
+key_part->null_offset = 0
+
+table->key_info[2] user_defined_key_parts = 1
+table->key_info[2] algorithm == HA_KEY_ALG_LONG_HASH = 1
+table->key_info[2] flags & HA_NOSAME = 0
+
+table->s->key_info[2] user_defined_key_parts = 1
+table->s->key_info[2] algorithm == HA_KEY_ALG_LONG_HASH = 1
+table->s->key_info[2] flags & HA_NOSAME = 1
+
+Printing table->key_info[2].key_part[0] info
+key_part->offset = 47
+key_part->field_name = DB_ROW_HASH_3
+key_part->length = 8
+key_part->null_bit = 32
+key_part->null_offset = 0
+
+Printing share->key_info[2].key_part[0] info
+key_part->offset = 21
+key_part->field_name = c
+key_part->length = 0
+key_part->null_bit = 4
+key_part->null_offset = 0
+
+Printing table->fields
+
+table->field[0]->field_name a
+table->field[0]->offset = 1
+table->field[0]->field_length = 10
+table->field[0]->null_pos wrt to record 0 = 0
+table->field[0]->null_bit_pos = 1
+
+table->field[1]->field_name b
+table->field[1]->offset = 11
+table->field[1]->field_length = 10
+table->field[1]->null_pos wrt to record 0 = 0
+table->field[1]->null_bit_pos = 2
+
+table->field[2]->field_name c
+table->field[2]->offset = 21
+table->field[2]->field_length = 10
+table->field[2]->null_pos wrt to record 0 = 0
+table->field[2]->null_bit_pos = 4
+
+table->field[3]->field_name DB_ROW_HASH_1
+table->field[3]->offset = 31
+table->field[3]->field_length = 8
+table->field[3]->null_pos wrt to record 0 = 0
+table->field[3]->null_bit_pos = 8
+
+table->field[4]->field_name DB_ROW_HASH_2
+table->field[4]->offset = 39
+table->field[4]->field_length = 8
+table->field[4]->null_pos wrt to record 0 = 0
+table->field[4]->null_bit_pos = 16
+
+table->field[5]->field_name DB_ROW_HASH_3
+table->field[5]->offset = 47
+table->field[5]->field_length = 8
+table->field[5]->null_pos wrt to record 0 = 0
+table->field[5]->null_bit_pos = 32
+
+SET debug_dbug="";
+drop table t1;
+SET debug_dbug="d,print_long_unique_internal_state";
+create table t1 ( a blob , b blob , c blob , d blob , unique (a,b), unique(c, d));
+Warnings:
+Note	1	Printing Table state, It will print table fields, fields->offset,field->null_bit, field->null_pos and key_info ... 
+
+Printing  Table  keyinfo
+
+table->s->reclength 57
+table->s->fields 6
+
+table->key_info[0] user_defined_key_parts = 1
+table->key_info[0] algorithm == HA_KEY_ALG_LONG_HASH = 1
+table->key_info[0] flags & HA_NOSAME = 0
+
+table->s->key_info[0] user_defined_key_parts = 2
+table->s->key_info[0] algorithm == HA_KEY_ALG_LONG_HASH = 1
+table->s->key_info[0] flags & HA_NOSAME = 1
+
+Printing table->key_info[0].key_part[0] info
+key_part->offset = 41
+key_part->field_name = DB_ROW_HASH_1
+key_part->length = 8
+key_part->null_bit = 16
+key_part->null_offset = 0
+
+Printing share->key_info[0].key_part[0] info
+key_part->offset = 1
+key_part->field_name = a
+key_part->length = 0
+key_part->null_bit = 1
+key_part->null_offset = 0
+
+Printing share->key_info[0].key_part[1] info
+key_part->offset = 11
+key_part->field_name = b
+key_part->length = 0
+key_part->null_bit = 2
+key_part->null_offset = 0
+
+table->key_info[1] user_defined_key_parts = 1
+table->key_info[1] algorithm == HA_KEY_ALG_LONG_HASH = 1
+table->key_info[1] flags & HA_NOSAME = 0
+
+table->s->key_info[1] user_defined_key_parts = 2
+table->s->key_info[1] algorithm == HA_KEY_ALG_LONG_HASH = 1
+table->s->key_info[1] flags & HA_NOSAME = 1
+
+Printing table->key_info[1].key_part[0] info
+key_part->offset = 49
+key_part->field_name = DB_ROW_HASH_2
+key_part->length = 8
+key_part->null_bit = 32
+key_part->null_offset = 0
+
+Printing share->key_info[1].key_part[0] info
+key_part->offset = 21
+key_part->field_name = c
+key_part->length = 0
+key_part->null_bit = 4
+key_part->null_offset = 0
+
+Printing share->key_info[1].key_part[1] info
+key_part->offset = 31
+key_part->field_name = d
+key_part->length = 0
+key_part->null_bit = 8
+key_part->null_offset = 0
+
+Printing table->fields
+
+table->field[0]->field_name a
+table->field[0]->offset = 1
+table->field[0]->field_length = 10
+table->field[0]->null_pos wrt to record 0 = 0
+table->field[0]->null_bit_pos = 1
+
+table->field[1]->field_name b
+table->field[1]->offset = 11
+table->field[1]->field_length = 10
+table->field[1]->null_pos wrt to record 0 = 0
+table->field[1]->null_bit_pos = 2
+
+table->field[2]->field_name c
+table->field[2]->offset = 21
+table->field[2]->field_length = 10
+table->field[2]->null_pos wrt to record 0 = 0
+table->field[2]->null_bit_pos = 4
+
+table->field[3]->field_name d
+table->field[3]->offset = 31
+table->field[3]->field_length = 10
+table->field[3]->null_pos wrt to record 0 = 0
+table->field[3]->null_bit_pos = 8
+
+table->field[4]->field_name DB_ROW_HASH_1
+table->field[4]->offset = 41
+table->field[4]->field_length = 8
+table->field[4]->null_pos wrt to record 0 = 0
+table->field[4]->null_bit_pos = 16
+
+table->field[5]->field_name DB_ROW_HASH_2
+table->field[5]->offset = 49
+table->field[5]->field_length = 8
+table->field[5]->null_pos wrt to record 0 = 0
+table->field[5]->null_bit_pos = 32
+
+SET debug_dbug="";
+drop table t1;
+SET debug_dbug="d,print_long_unique_internal_state";
+create table t1(a int primary key, b blob unique , c blob unique not null);
+Warnings:
+Note	1	Printing Table state, It will print table fields, fields->offset,field->null_bit, field->null_pos and key_info ... 
+
+Printing  Table  keyinfo
+
+table->s->reclength 41
+table->s->fields 5
+
+table->key_info[0] user_defined_key_parts = 1
+table->key_info[0] algorithm == HA_KEY_ALG_LONG_HASH = 0
+table->key_info[0] flags & HA_NOSAME = 1
+
+table->s->key_info[0] user_defined_key_parts = 1
+table->s->key_info[0] algorithm == HA_KEY_ALG_LONG_HASH = 0
+table->s->key_info[0] flags & HA_NOSAME = 1
+
+Printing table->key_info[0].key_part[0] info
+key_part->offset = 1
+key_part->field_name = a
+key_part->length = 4
+key_part->null_bit = 0
+key_part->null_offset = 0
+
+Printing share->key_info[0].key_part[0] info
+key_part->offset = 1
+key_part->field_name = a
+key_part->length = 4
+key_part->null_bit = 0
+key_part->null_offset = 0
+
+table->key_info[1] user_defined_key_parts = 1
+table->key_info[1] algorithm == HA_KEY_ALG_LONG_HASH = 1
+table->key_info[1] flags & HA_NOSAME = 0
+
+table->s->key_info[1] user_defined_key_parts = 1
+table->s->key_info[1] algorithm == HA_KEY_ALG_LONG_HASH = 1
+table->s->key_info[1] flags & HA_NOSAME = 1
+
+Printing table->key_info[1].key_part[0] info
+key_part->offset = 25
+key_part->field_name = DB_ROW_HASH_1
+key_part->length = 8
+key_part->null_bit = 2
+key_part->null_offset = 0
+
+Printing share->key_info[1].key_part[0] info
+key_part->offset = 5
+key_part->field_name = b
+key_part->length = 0
+key_part->null_bit = 1
+key_part->null_offset = 0
+
+table->key_info[2] user_defined_key_parts = 1
+table->key_info[2] algorithm == HA_KEY_ALG_LONG_HASH = 1
+table->key_info[2] flags & HA_NOSAME = 0
+
+table->s->key_info[2] user_defined_key_parts = 1
+table->s->key_info[2] algorithm == HA_KEY_ALG_LONG_HASH = 1
+table->s->key_info[2] flags & HA_NOSAME = 1
+
+Printing table->key_info[2].key_part[0] info
+key_part->offset = 33
+key_part->field_name = DB_ROW_HASH_2
+key_part->length = 8
+key_part->null_bit = 0
+key_part->null_offset = 0
+
+Printing share->key_info[2].key_part[0] info
+key_part->offset = 15
+key_part->field_name = c
+key_part->length = 0
+key_part->null_bit = 0
+key_part->null_offset = 0
+
+Printing table->fields
+
+table->field[0]->field_name a
+table->field[0]->offset = 1
+table->field[0]->field_length = 4
+table->field[0]->null_pos wrt to record 0 = -1
+table->field[0]->null_bit_pos = 0
+
+table->field[1]->field_name b
+table->field[1]->offset = 5
+table->field[1]->field_length = 10
+table->field[1]->null_pos wrt to record 0 = 0
+table->field[1]->null_bit_pos = 1
+
+table->field[2]->field_name c
+table->field[2]->offset = 15
+table->field[2]->field_length = 10
+table->field[2]->null_pos wrt to record 0 = -1
+table->field[2]->null_bit_pos = 0
+
+table->field[3]->field_name DB_ROW_HASH_1
+table->field[3]->offset = 25
+table->field[3]->field_length = 8
+table->field[3]->null_pos wrt to record 0 = 0
+table->field[3]->null_bit_pos = 2
+
+table->field[4]->field_name DB_ROW_HASH_2
+table->field[4]->offset = 33
+table->field[4]->field_length = 8
+table->field[4]->null_pos wrt to record 0 = -1
+table->field[4]->null_bit_pos = 0
+
+SET debug_dbug="";
+drop table t1;
+##Using hash
+SET debug_dbug="d,print_long_unique_internal_state";
+create table t1(a int ,b int , c int,  unique(a, b, c) using hash);
+Warnings:
+Note	1	Printing Table state, It will print table fields, fields->offset,field->null_bit, field->null_pos and key_info ... 
+
+Printing  Table  keyinfo
+
+table->s->reclength 21
+table->s->fields 4
+
+table->key_info[0] user_defined_key_parts = 1
+table->key_info[0] algorithm == HA_KEY_ALG_LONG_HASH = 1
+table->key_info[0] flags & HA_NOSAME = 0
+
+table->s->key_info[0] user_defined_key_parts = 3
+table->s->key_info[0] algorithm == HA_KEY_ALG_LONG_HASH = 1
+table->s->key_info[0] flags & HA_NOSAME = 1
+
+Printing table->key_info[0].key_part[0] info
+key_part->offset = 13
+key_part->field_name = DB_ROW_HASH_1
+key_part->length = 8
+key_part->null_bit = 16
+key_part->null_offset = 0
+
+Printing share->key_info[0].key_part[0] info
+key_part->offset = 1
+key_part->field_name = a
+key_part->length = 4
+key_part->null_bit = 2
+key_part->null_offset = 0
+
+Printing share->key_info[0].key_part[1] info
+key_part->offset = 5
+key_part->field_name = b
+key_part->length = 4
+key_part->null_bit = 4
+key_part->null_offset = 0
+
+Printing share->key_info[0].key_part[2] info
+key_part->offset = 9
+key_part->field_name = c
+key_part->length = 4
+key_part->null_bit = 8
+key_part->null_offset = 0
+
+Printing table->fields
+
+table->field[0]->field_name a
+table->field[0]->offset = 1
+table->field[0]->field_length = 4
+table->field[0]->null_pos wrt to record 0 = 0
+table->field[0]->null_bit_pos = 2
+
+table->field[1]->field_name b
+table->field[1]->offset = 5
+table->field[1]->field_length = 4
+table->field[1]->null_pos wrt to record 0 = 0
+table->field[1]->null_bit_pos = 4
+
+table->field[2]->field_name c
+table->field[2]->offset = 9
+table->field[2]->field_length = 4
+table->field[2]->null_pos wrt to record 0 = 0
+table->field[2]->null_bit_pos = 8
+
+table->field[3]->field_name DB_ROW_HASH_1
+table->field[3]->offset = 13
+table->field[3]->field_length = 8
+table->field[3]->null_pos wrt to record 0 = 0
+table->field[3]->null_bit_pos = 16
+
+SET debug_dbug="";
+drop table t1;
+##Using hash but with memory engine so no long unique column
+SET debug_dbug="d,print_long_unique_internal_state";
+create table t1(a int ,b int , c int,  unique(a, b, c) using hash) engine=memory;
+Warnings:
+Note	1	Printing Table state, It will print table fields, fields->offset,field->null_bit, field->null_pos and key_info ... 
+
+Printing  Table  keyinfo
+
+table->s->reclength 13
+table->s->fields 3
+
+table->key_info[0] user_defined_key_parts = 3
+table->key_info[0] algorithm == HA_KEY_ALG_LONG_HASH = 0
+table->key_info[0] flags & HA_NOSAME = 1
+
+table->s->key_info[0] user_defined_key_parts = 3
+table->s->key_info[0] algorithm == HA_KEY_ALG_LONG_HASH = 0
+table->s->key_info[0] flags & HA_NOSAME = 1
+
+Printing table->key_info[0].key_part[0] info
+key_part->offset = 1
+key_part->field_name = a
+key_part->length = 4
+key_part->null_bit = 2
+key_part->null_offset = 0
+
+Printing share->key_info[0].key_part[0] info
+key_part->offset = 1
+key_part->field_name = a
+key_part->length = 4
+key_part->null_bit = 2
+key_part->null_offset = 0
+
+Printing share->key_info[0].key_part[1] info
+key_part->offset = 5
+key_part->field_name = b
+key_part->length = 4
+key_part->null_bit = 4
+key_part->null_offset = 0
+
+Printing share->key_info[0].key_part[2] info
+key_part->offset = 9
+key_part->field_name = c
+key_part->length = 4
+key_part->null_bit = 8
+key_part->null_offset = 0
+
+Printing table->fields
+
+table->field[0]->field_name a
+table->field[0]->offset = 1
+table->field[0]->field_length = 4
+table->field[0]->null_pos wrt to record 0 = 0
+table->field[0]->null_bit_pos = 2
+
+table->field[1]->field_name b
+table->field[1]->offset = 5
+table->field[1]->field_length = 4
+table->field[1]->null_pos wrt to record 0 = 0
+table->field[1]->null_bit_pos = 4
+
+table->field[2]->field_name c
+table->field[2]->offset = 9
+table->field[2]->field_length = 4
+table->field[2]->null_pos wrt to record 0 = 0
+table->field[2]->null_bit_pos = 8
+
+SET debug_dbug="";
+drop table t1;
diff --git a/mysql-test/main/long_unique_debug.test b/mysql-test/main/long_unique_debug.test
new file mode 100644
index 00000000000..63ebfa89b48
--- /dev/null
+++ b/mysql-test/main/long_unique_debug.test
@@ -0,0 +1,91 @@
+--source include/have_debug.inc
+--source include/have_innodb.inc
+--echo #In this test case we will check what will happen in the case of hash collision
+
+SET debug_dbug="d,same_long_unique_hash";
+create table t1(a blob unique);
+
+FLUSH STATUS;
+insert into t1 values('xyz');
+insert into t1 values('abc');
+insert into t1 values('sachin');
+--error ER_DUP_ENTRY
+insert into t1 values('sachin');
+insert into t1 values('maria');
+--error ER_DUP_ENTRY
+insert into t1 values('maria');
+drop table t1;
+SHOW STATUS LIKE 'handler_read_next';
+
+SET debug_dbug="";
+create table t1(a blob unique);
+FLUSH STATUS;
+
+insert into t1 values('xyz');
+insert into t1 values('abc');
+insert into t1 values('sachin');
+--error ER_DUP_ENTRY
+insert into t1 values('sachin');
+insert into t1 values('maria');
+--error ER_DUP_ENTRY
+insert into t1 values('maria');
+drop table t1;
+SHOW STATUS LIKE 'handler_read_next';
+
+SET debug_dbug="d,same_long_unique_hash";
+create table t1(a blob unique, b blob unique);
+
+insert into t1 values('xyz', 11);
+insert into t1 values('abc', 22);
+insert into t1 values('sachin', 1);
+--error ER_DUP_ENTRY
+insert into t1 values('sachin', 4);
+insert into t1 values('maria', 2);
+--error ER_DUP_ENTRY
+insert into t1 values('maria', 3);
+drop table t1;
+
+create table t1(a blob , b blob , unique(a,b));
+
+insert into t1 values('xyz', 11);
+insert into t1 values('abc', 22);
+insert into t1 values('sachin', 1);
+--error ER_DUP_ENTRY
+insert into t1 values('sachin', 1);
+insert into t1 values('maria', 2);
+--error ER_DUP_ENTRY
+insert into t1 values('maria', 2);
+drop table t1;
+
+--echo ##Internal State of long unique tables
+SET debug_dbug="d,print_long_unique_internal_state";
+create table t1 ( a blob unique);
+SET debug_dbug="";
+drop table t1;
+
+SET debug_dbug="d,print_long_unique_internal_state";
+create table t1 ( a blob unique, b blob unique , c blob  unique);
+SET debug_dbug="";
+drop table t1;
+
+SET debug_dbug="d,print_long_unique_internal_state";
+create table t1 ( a blob , b blob , c blob , d blob , unique (a,b), unique(c, d));
+SET debug_dbug="";
+drop table t1;
+
+SET debug_dbug="d,print_long_unique_internal_state";
+create table t1(a int primary key, b blob unique , c blob unique not null);
+SET debug_dbug="";
+drop table t1;
+
+--echo ##Using hash
+SET debug_dbug="d,print_long_unique_internal_state";
+create table t1(a int ,b int , c int,  unique(a, b, c) using hash);
+SET debug_dbug="";
+drop table t1;
+
+--echo ##Using hash but with memory engine so no long unique column
+SET debug_dbug="d,print_long_unique_internal_state";
+create table t1(a int ,b int , c int,  unique(a, b, c) using hash) engine=memory;
+SET debug_dbug="";
+drop table t1;
diff --git a/mysql-test/main/long_unique_innodb.result b/mysql-test/main/long_unique_innodb.result
new file mode 100644
index 00000000000..efbddfb30a8
--- /dev/null
+++ b/mysql-test/main/long_unique_innodb.result
@@ -0,0 +1,123 @@
+create table t1(a blob unique) engine= InnoDB;
+insert into t1 values('RUC');
+insert into t1 values ('RUC');
+ERROR 23000: Duplicate entry 'RUC' for key 'a'
+drop table t1;
+#test for concurrent insert of long unique in innodb
+create table t1(a blob unique) engine= InnoDB;
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` blob DEFAULT NULL,
+  UNIQUE KEY `a` (`a`) USING HASH
+) ENGINE=InnoDB DEFAULT CHARSET=latin1
+connect  'con1', localhost, root,,;
+connect  'con2', localhost, root,,;
+connection con1;
+set innodb_lock_wait_timeout= 2;
+set  transaction isolation level READ UNCOMMITTED;
+start transaction;
+insert into t1 values('RUC');
+connection con2;
+set innodb_lock_wait_timeout= 2;
+set  transaction isolation level READ UNCOMMITTED;
+start transaction;
+insert into t1 values ('RUC');
+ERROR HY000: Lock wait timeout exceeded; try restarting transaction
+connection con1;
+commit;
+set  transaction isolation level READ COMMITTED;
+start transaction;
+insert into t1 values('RC');
+connection con2;
+commit;
+set  transaction isolation level READ COMMITTED;
+start transaction;
+insert into t1 values ('RC');
+ERROR HY000: Lock wait timeout exceeded; try restarting transaction
+commit;
+connection con1;
+commit;
+set  transaction isolation level REPEATABLE READ;
+start transaction;
+insert into t1 values('RR');
+connection con2;
+commit;
+set  transaction isolation level REPEATABLE READ;
+start transaction;
+insert into t1 values ('RR');
+ERROR HY000: Lock wait timeout exceeded; try restarting transaction
+connection con1;
+commit;
+set  transaction isolation level SERIALIZABLE;
+start transaction;
+insert into t1 values('S');
+connection con2;
+commit;
+set  transaction isolation level SERIALIZABLE;
+start transaction;
+insert into t1 values ('S');
+ERROR HY000: Lock wait timeout exceeded; try restarting transaction
+commit;
+connection con1;
+commit;
+select * from t1;
+a
+RUC
+RC
+RR
+S
+drop table t1;
+create table t1(a blob unique) engine=Innodb;
+connection con1;
+set  transaction isolation level READ UNCOMMITTED;
+start transaction;
+insert into t1 values('RUC');
+connection con2;
+set  transaction isolation level READ UNCOMMITTED;
+start transaction;
+insert into t1 values ('RUC');;
+connection con1;
+rollback;
+connection con2;
+commit;
+connection con1;
+set  transaction isolation level READ COMMITTED;
+start transaction;
+insert into t1 values('RC');
+connection con2;
+set  transaction isolation level READ COMMITTED;
+start transaction;
+insert into t1 values ('RC');;
+connection con1;
+rollback;
+connection con2;
+commit;
+connection con1;
+set  transaction isolation level REPEATABLE READ;
+start transaction;
+insert into t1 values('RR');
+connection con2;
+set  transaction isolation level REPEATABLE READ;
+start transaction;
+insert into t1 values ('RR');;
+connection con1;
+rollback;
+connection con2;
+commit;
+connection con1;
+set  transaction isolation level SERIALIZABLE;
+start transaction;
+insert into t1 values('S');
+connection con2;
+set  transaction isolation level SERIALIZABLE;
+start transaction;
+insert into t1 values ('S');;
+connection con1;
+rollback;
+connection con2;
+commit;
+connection default;
+drop table t1;
+disconnect con1;
+disconnect con2;
diff --git a/mysql-test/main/long_unique_innodb.test b/mysql-test/main/long_unique_innodb.test
new file mode 100644
index 00000000000..f3c7f7d952d
--- /dev/null
+++ b/mysql-test/main/long_unique_innodb.test
@@ -0,0 +1,135 @@
+--source include/have_innodb.inc
+
+create table t1(a blob unique) engine= InnoDB;
+insert into t1 values('RUC');
+--error ER_DUP_ENTRY
+insert into t1 values ('RUC');
+drop table t1;
+
+--echo #test for concurrent insert of long unique in innodb
+create table t1(a blob unique) engine= InnoDB;
+show create table t1;
+connect ('con1', localhost, root,,);
+connect ('con2', localhost, root,,);
+
+--connection con1
+set innodb_lock_wait_timeout= 2;
+set  transaction isolation level READ UNCOMMITTED;
+start transaction;
+insert into t1 values('RUC');
+--connection con2
+set innodb_lock_wait_timeout= 2;
+set  transaction isolation level READ UNCOMMITTED;
+start transaction;
+--error ER_LOCK_WAIT_TIMEOUT
+insert into t1 values ('RUC');
+
+--connection con1
+commit;
+set  transaction isolation level READ COMMITTED;
+start transaction;
+insert into t1 values('RC');
+--connection con2
+commit;
+set  transaction isolation level READ COMMITTED;
+start transaction;
+--error ER_DUP_ENTRY
+--error ER_LOCK_WAIT_TIMEOUT
+insert into t1 values ('RC');
+commit;
+
+--connection con1
+commit;
+set  transaction isolation level REPEATABLE READ;
+start transaction;
+insert into t1 values('RR');
+--connection con2
+commit;
+set  transaction isolation level REPEATABLE READ;
+start transaction;
+--error ER_DUP_ENTRY
+--error ER_LOCK_WAIT_TIMEOUT
+insert into t1 values ('RR');
+
+--connection con1
+commit;
+set  transaction isolation level SERIALIZABLE;
+start transaction;
+insert into t1 values('S');
+--connection con2
+commit;
+set  transaction isolation level SERIALIZABLE;
+start transaction;
+--error ER_DUP_ENTRY
+--error ER_LOCK_WAIT_TIMEOUT
+insert into t1 values ('S');
+commit;
+
+--connection con1
+commit;
+
+select * from t1;
+drop table t1;
+
+create table t1(a blob unique) engine=Innodb;
+
+--connection con1
+set  transaction isolation level READ UNCOMMITTED;
+start transaction;
+insert into t1 values('RUC');
+--connection con2
+set  transaction isolation level READ UNCOMMITTED;
+start transaction;
+--send insert into t1 values ('RUC');
+--connection con1
+rollback;
+--connection con2
+--reap
+commit;
+
+--connection con1
+set  transaction isolation level READ COMMITTED;
+start transaction;
+insert into t1 values('RC');
+--connection con2
+set  transaction isolation level READ COMMITTED;
+start transaction;
+--send insert into t1 values ('RC');
+--connection con1
+rollback;
+--connection con2
+--reap
+commit;
+
+--connection con1
+set  transaction isolation level REPEATABLE READ;
+start transaction;
+insert into t1 values('RR');
+--connection con2
+set  transaction isolation level REPEATABLE READ;
+start transaction;
+--send insert into t1 values ('RR');
+--connection con1
+rollback;
+--connection con2
+--reap
+commit;
+
+--connection con1
+set  transaction isolation level SERIALIZABLE;
+start transaction;
+insert into t1 values('S');
+--connection con2
+set  transaction isolation level SERIALIZABLE;
+start transaction;
+--send insert into t1 values ('S');
+--connection con1
+rollback;
+--connection con2
+--reap
+commit;
+
+connection default;
+drop table t1;
+disconnect con1;
+disconnect con2;
diff --git a/mysql-test/main/long_unique_update.result b/mysql-test/main/long_unique_update.result
new file mode 100644
index 00000000000..60a4fb46558
--- /dev/null
+++ b/mysql-test/main/long_unique_update.result
@@ -0,0 +1,317 @@
+#structure of tests;
+#1 test of table containing single unique blob column;
+#2 test of table containing another unique int/ varchar etc column; 
+#3 test of table containing multiple unique blob column like unique(a),unique(b);
+#4 test of table containing multiple multiple unique blob column like unique(a,b...),unique(c,d....);
+#structure of each test;
+#test if update works;
+#test update for duplicate entry;
+#test update for no change keys;
+#test update for ignore ;
+#test 1
+create table t1 (a blob unique);
+show keys from t1;
+Table	t1
+Non_unique	0
+Key_name	a
+Seq_in_index	1
+Column_name	a
+Collation	A
+Cardinality	NULL
+Sub_part	NULL
+Packed	NULL
+Null	YES
+Index_type	HASH
+Comment	
+Index_comment	
+insert into t1 values(1),(2),(3),(4),(5);
+select * from t1;
+a
+1
+2
+3
+4
+5
+update t1 set a=11 where a=5;
+update t1 set a=a+20 where a=1;
+select * from t1;
+a
+21
+2
+3
+4
+11
+update t1 set a=3 where a=2;
+ERROR 23000: Duplicate entry '3' for key 'a'
+update t1 set a=4 where a=3;
+ERROR 23000: Duplicate entry '4' for key 'a'
+#no change in blob key
+update t1 set a=3 where a=3;
+update t1 set a=2 where a=2;
+select* from t1;
+a
+21
+2
+3
+4
+11
+#IGNORE;
+update ignore t1 set a=3 where a=2;
+update ignore t1 set a=4 where a=3;
+select * from t1;
+a
+21
+2
+3
+4
+11
+drop table t1;
+#test 2;
+create table t1 (a int primary key, b blob unique , c int unique );
+show keys from t1;
+Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment	Index_comment
+t1	0	PRIMARY	1	a	A	0	NULL	NULL		BTREE		
+t1	0	b	1	b	A	NULL	NULL	NULL	YES	HASH		
+t1	0	c	1	c	A	NULL	NULL	NULL	YES	BTREE		
+insert into t1 values(1,1,1),(2,2,2),(3,3,3),(4,4,4),(5,5,5),(6,6,6),(7,7,7);
+select * from t1 limit 3;
+a	b	c
+1	1	1
+2	2	2
+3	3	3
+update t1 set b=34 where a=1;
+update t1 set b=a+c+b+34 where b=2;
+update t1 set b=a+10+b where c=3;
+select * from t1;
+a	b	c
+1	34	1
+2	40	2
+3	16	3
+4	4	4
+5	5	5
+6	6	6
+7	7	7
+truncate table t1;
+insert into t1 values(1,1,1),(2,2,2),(3,3,3),(4,4,4),(5,5,5),(6,6,6),(7,7,7);
+update t1 set b=4 where a=3;
+ERROR 23000: Duplicate entry '4' for key 'b'
+update t1 set b=a+1 where b=3;
+ERROR 23000: Duplicate entry '4' for key 'b'
+update t1 set b=a+1 where c=3;
+ERROR 23000: Duplicate entry '4' for key 'b'
+#no change in blob key
+update t1 set b=3 where a=3;
+update t1 set b=2 where b=2;
+update t1 set b=5 where c=5;
+select* from t1;
+a	b	c
+1	1	1
+2	2	2
+3	3	3
+4	4	4
+5	5	5
+6	6	6
+7	7	7
+#IGNORE;
+update ignore t1 set b=3 where a=2;
+update ignore t1 set b=4 where b=3;
+update ignore t1 set b=5 where c=3;
+select * from t1;
+a	b	c
+1	1	1
+2	2	2
+3	3	3
+4	4	4
+5	5	5
+6	6	6
+7	7	7
+drop table t1;
+#test 3;
+create table t1 (a blob unique, b blob unique , c blob unique);
+show keys from t1;
+Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment	Index_comment
+t1	0	a	1	a	A	NULL	NULL	NULL	YES	HASH		
+t1	0	b	1	b	A	NULL	NULL	NULL	YES	HASH		
+t1	0	c	1	c	A	NULL	NULL	NULL	YES	HASH		
+insert into t1 values(1,1,1),(2,2,2),(3,3,3),(4,4,4),(5,5,5),(6,6,6),(7,7,7);
+select * from t1 limit 3;
+a	b	c
+1	1	1
+2	2	2
+3	3	3
+update t1 set b=34 where a=1;
+update t1 set b=a+c+b+34 where b=2;
+update t1 set b=a+10+b where c=3;
+select * from t1;
+a	b	c
+1	34	1
+2	40	2
+3	16	3
+4	4	4
+5	5	5
+6	6	6
+7	7	7
+truncate table t1;
+insert into t1 values(1,1,1),(2,2,2),(3,3,3),(4,4,4),(5,5,5),(6,6,6),(7,7,7);
+update t1 set b=4 where a=3;
+ERROR 23000: Duplicate entry '4' for key 'b'
+update t1 set b=a+1 where b=3;
+ERROR 23000: Duplicate entry '4' for key 'b'
+update t1 set b=a+1 where c=3;
+ERROR 23000: Duplicate entry '4' for key 'b'
+#no change in blob key
+update t1 set b=3 where a=3;
+update t1 set b=2 where b=2;
+update t1 set b=5 where c=5;
+select* from t1;
+a	b	c
+1	1	1
+2	2	2
+3	3	3
+4	4	4
+5	5	5
+6	6	6
+7	7	7
+#IGNORE;
+update ignore t1 set b=3 where a=2;
+update ignore t1 set b=4 where b=3;
+update ignore t1 set b=5 where c=3;
+update ignore t1 set b=b+3 where a>1 or b>1 or c>1;
+select * from t1;
+a	b	c
+1	1	1
+2	2	2
+3	3	3
+4	4	4
+5	8	5
+6	9	6
+7	10	7
+update ignore t1 set b=b+5 where a>1 and  b<5 and  c<a+b;
+select * from t1;
+a	b	c
+1	1	1
+2	7	2
+3	3	3
+4	4	4
+5	8	5
+6	9	6
+7	10	7
+drop table t1;
+#test 4 ultimate test;
+create table t1 (a int primary key , b int, c blob , d blob , e  varchar(2000), f int , g text, 
+unique (b,c), unique (b,f),unique(e,g),unique(a,b,c,d,e,f,g));
+desc t1;
+Field	Type	Null	Key	Default	Extra
+a	int(11)	NO	PRI	NULL	
+b	int(11)	YES	MUL	NULL	
+c	blob	YES		NULL	
+d	blob	YES		NULL	
+e	varchar(2000)	YES	MUL	NULL	
+f	int(11)	YES		NULL	
+g	text	YES		NULL	
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `a` int(11) NOT NULL,
+  `b` int(11) DEFAULT NULL,
+  `c` blob DEFAULT NULL,
+  `d` blob DEFAULT NULL,
+  `e` varchar(2000) DEFAULT NULL,
+  `f` int(11) DEFAULT NULL,
+  `g` text DEFAULT NULL,
+  PRIMARY KEY (`a`),
+  UNIQUE KEY `b` (`b`,`c`) USING HASH,
+  UNIQUE KEY `b_2` (`b`,`f`),
+  UNIQUE KEY `e` (`e`,`g`) USING HASH,
+  UNIQUE KEY `a` (`a`,`b`,`c`,`d`,`e`,`f`,`g`) USING HASH
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+show keys from t1;
+Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment	Index_comment
+t1	0	PRIMARY	1	a	A	0	NULL	NULL		BTREE		
+t1	0	b	1	b	A	NULL	NULL	NULL	YES	HASH		
+t1	0	b	2	c	A	NULL	NULL	NULL	YES	HASH		
+t1	0	b_2	1	b	A	NULL	NULL	NULL	YES	BTREE		
+t1	0	b_2	2	f	A	NULL	NULL	NULL	YES	BTREE		
+t1	0	e	1	e	A	NULL	NULL	NULL	YES	HASH		
+t1	0	e	2	g	A	NULL	NULL	NULL	YES	HASH		
+t1	0	a	1	a	A	NULL	NULL	NULL		HASH		
+t1	0	a	2	b	A	NULL	NULL	NULL	YES	HASH		
+t1	0	a	3	c	A	NULL	NULL	NULL	YES	HASH		
+t1	0	a	4	d	A	NULL	NULL	NULL	YES	HASH		
+t1	0	a	5	e	A	NULL	NULL	NULL	YES	HASH		
+t1	0	a	6	f	A	NULL	NULL	NULL	YES	HASH		
+t1	0	a	7	g	A	NULL	NULL	NULL	YES	HASH		
+insert into t1 values(1,1,1,1,1,1,1),(2,2,2,2,2,2,2),(3,3,3,3,3,3,3),(4,4,4,4,4,4,4),
+(5,5,5,5,5,5,5),(6,6,6,6,6,6,6),(7,7,7,7,7,7,7),(8,8,8,8,8,8,8),(9,9,9,9,9,9,9);
+select * from t1 limit 3;
+a	b	c	d	e	f	g
+1	1	1	1	1	1	1
+2	2	2	2	2	2	2
+3	3	3	3	3	3	3
+#key b_c
+update t1 set b=2 ,c=2 where a=1;
+ERROR 23000: Duplicate entry '2-2' for key 'b'
+update t1 set b=b+34, c=c+34 where e=1 and g=1 ;
+update t1 set b=35, c=35 where e=1 and g=1 ;
+update t1 set b=b+1, c=c+1 where a>0;
+ERROR 23000: Duplicate entry '3-3' for key 'b'
+update ignore t1 set b=b+1, c=c+1 where a>0;
+select * from t1 ;
+a	b	c	d	e	f	g
+1	37	37	1	1	1	1
+2	2	2	2	2	2	2
+3	3	3	3	3	3	3
+4	4	4	4	4	4	4
+5	5	5	5	5	5	5
+6	6	6	6	6	6	6
+7	7	7	7	7	7	7
+8	8	8	8	8	8	8
+9	10	10	9	9	9	9
+truncate table t1;
+insert into t1 values(1,1,1,1,1,1,1),(2,2,2,2,2,2,2),(3,3,3,3,3,3,3),(4,4,4,4,4,4,4),
+(5,5,5,5,5,5,5),(6,6,6,6,6,6,6),(7,7,7,7,7,7,7),(8,8,8,8,8,8,8),(9,9,9,9,9,9,9);
+#key b_f no hash key
+update t1 set b=2 , f=2 where a=1;
+ERROR 23000: Duplicate entry '2-2' for key 'b_2'
+update  t1 set b=b+33, f=f+33 where e=1 and g=1;
+update t1 set b=34, f=34 where e=1 and g=1 ;
+update t1 set b=b+1, f=f+1 where a>0;
+ERROR 23000: Duplicate entry '3-3' for key 'b_2'
+update ignore t1 set b=b+1, f=f+1 where a>0;
+select * from t1 ;
+a	b	c	d	e	f	g
+1	36	1	1	1	36	1
+2	2	2	2	2	2	2
+3	3	3	3	3	3	3
+4	4	4	4	4	4	4
+5	5	5	5	5	5	5
+6	6	6	6	6	6	6
+7	7	7	7	7	7	7
+8	8	8	8	8	8	8
+9	10	9	9	9	10	9
+truncate table t1;
+insert into t1 values(1,1,1,1,1,1,1),(2,2,2,2,2,2,2),(3,3,3,3,3,3,3),(4,4,4,4,4,4,4),
+(5,5,5,5,5,5,5),(6,6,6,6,6,6,6),(7,7,7,7,7,7,7),(8,8,8,8,8,8,8),(9,9,9,9,9,9,9);
+#key e_g
+update t1 set e=2 , g=2 where a=1;
+ERROR 23000: Duplicate entry '2-2' for key 'e'
+update  t1 set e=e+34, g=g+34 where a=1;
+update t1 set e=34, g=34 where e=1 and g=1 ;
+select * from t1 where  a=1;
+a	b	c	d	e	f	g
+1	1	1	1	35	1	35
+update t1 set e=e+1, g=g+1 where a>0;
+ERROR 23000: Duplicate entry '3-3' for key 'e'
+update ignore t1 set e=e+1, g=g+1 where a>0;
+select * from t1 ;
+a	b	c	d	e	f	g
+1	1	1	1	37	1	37
+2	2	2	2	2	2	2
+3	3	3	3	3	3	3
+4	4	4	4	4	4	4
+5	5	5	5	5	5	5
+6	6	6	6	6	6	6
+7	7	7	7	7	7	7
+8	8	8	8	8	8	8
+9	9	9	9	10	9	10
+drop table t1;
diff --git a/mysql-test/main/long_unique_update.test b/mysql-test/main/long_unique_update.test
new file mode 100644
index 00000000000..b160ebad9f1
--- /dev/null
+++ b/mysql-test/main/long_unique_update.test
@@ -0,0 +1,138 @@
+--echo #structure of tests;
+--echo #1 test of table containing single unique blob column;
+--echo #2 test of table containing another unique int/ varchar etc column; 
+--echo #3 test of table containing multiple unique blob column like unique(a),unique(b);
+--echo #4 test of table containing multiple multiple unique blob column like unique(a,b...),unique(c,d....);
+--echo #structure of each test;
+--echo #test if update works;
+--echo #test update for duplicate entry;
+--echo #test update for no change keys;
+--echo #test update for ignore ;
+
+--echo #test 1
+create table t1 (a blob unique);
+query_vertical show keys from t1;
+insert into t1 values(1),(2),(3),(4),(5);
+select * from t1;
+update t1 set a=11 where a=5;
+update t1 set a=a+20 where a=1;
+select * from t1;
+--error ER_DUP_ENTRY
+update t1 set a=3 where a=2;
+--error ER_DUP_ENTRY
+update t1 set a=4 where a=3;
+--echo #no change in blob key
+update t1 set a=3 where a=3;
+update t1 set a=2 where a=2;
+select* from t1;
+--echo #IGNORE;
+update ignore t1 set a=3 where a=2;
+update ignore t1 set a=4 where a=3;
+select * from t1;
+drop table t1;
+
+--echo #test 2;
+create table t1 (a int primary key, b blob unique , c int unique );
+show keys from t1;
+insert into t1 values(1,1,1),(2,2,2),(3,3,3),(4,4,4),(5,5,5),(6,6,6),(7,7,7);
+select * from t1 limit 3;
+update t1 set b=34 where a=1;
+update t1 set b=a+c+b+34 where b=2;
+update t1 set b=a+10+b where c=3;
+select * from t1;
+truncate table t1;
+insert into t1 values(1,1,1),(2,2,2),(3,3,3),(4,4,4),(5,5,5),(6,6,6),(7,7,7);
+--error ER_DUP_ENTRY
+update t1 set b=4 where a=3;
+--error ER_DUP_ENTRY
+update t1 set b=a+1 where b=3;
+--error ER_DUP_ENTRY
+update t1 set b=a+1 where c=3;
+--echo #no change in blob key
+update t1 set b=3 where a=3;
+update t1 set b=2 where b=2;
+update t1 set b=5 where c=5;
+select* from t1;
+--echo #IGNORE;
+update ignore t1 set b=3 where a=2;
+update ignore t1 set b=4 where b=3;
+update ignore t1 set b=5 where c=3;
+select * from t1;
+drop table t1;
+
+--echo #test 3;
+create table t1 (a blob unique, b blob unique , c blob unique);
+show keys from t1;
+insert into t1 values(1,1,1),(2,2,2),(3,3,3),(4,4,4),(5,5,5),(6,6,6),(7,7,7);
+select * from t1 limit 3;
+update t1 set b=34 where a=1;
+update t1 set b=a+c+b+34 where b=2;
+update t1 set b=a+10+b where c=3;
+select * from t1;
+truncate table t1;
+insert into t1 values(1,1,1),(2,2,2),(3,3,3),(4,4,4),(5,5,5),(6,6,6),(7,7,7);
+--error ER_DUP_ENTRY
+update t1 set b=4 where a=3;
+--error ER_DUP_ENTRY
+update t1 set b=a+1 where b=3;
+--error ER_DUP_ENTRY
+update t1 set b=a+1 where c=3;
+--echo #no change in blob key
+update t1 set b=3 where a=3;
+update t1 set b=2 where b=2;
+update t1 set b=5 where c=5;
+select* from t1;
+--echo #IGNORE;
+update ignore t1 set b=3 where a=2;
+update ignore t1 set b=4 where b=3;
+update ignore t1 set b=5 where c=3;
+update ignore t1 set b=b+3 where a>1 or b>1 or c>1;
+select * from t1;
+update ignore t1 set b=b+5 where a>1 and  b<5 and  c<a+b;
+select * from t1;
+drop table t1;
+
+--echo #test 4 ultimate test;
+create table t1 (a int primary key , b int, c blob , d blob , e  varchar(2000), f int , g text, 
+unique (b,c), unique (b,f),unique(e,g),unique(a,b,c,d,e,f,g));
+desc t1;
+show create table t1;
+show keys from t1;
+insert into t1 values(1,1,1,1,1,1,1),(2,2,2,2,2,2,2),(3,3,3,3,3,3,3),(4,4,4,4,4,4,4),
+(5,5,5,5,5,5,5),(6,6,6,6,6,6,6),(7,7,7,7,7,7,7),(8,8,8,8,8,8,8),(9,9,9,9,9,9,9);
+select * from t1 limit 3;
+--echo #key b_c
+--error ER_DUP_ENTRY
+update t1 set b=2 ,c=2 where a=1;
+update t1 set b=b+34, c=c+34 where e=1 and g=1 ;
+update t1 set b=35, c=35 where e=1 and g=1 ;
+--error ER_DUP_ENTRY
+update t1 set b=b+1, c=c+1 where a>0;
+update ignore t1 set b=b+1, c=c+1 where a>0;
+select * from t1 ;
+truncate table t1;
+insert into t1 values(1,1,1,1,1,1,1),(2,2,2,2,2,2,2),(3,3,3,3,3,3,3),(4,4,4,4,4,4,4),
+(5,5,5,5,5,5,5),(6,6,6,6,6,6,6),(7,7,7,7,7,7,7),(8,8,8,8,8,8,8),(9,9,9,9,9,9,9);
+--echo #key b_f no hash key
+--error ER_DUP_ENTRY
+update t1 set b=2 , f=2 where a=1;
+update  t1 set b=b+33, f=f+33 where e=1 and g=1;
+update t1 set b=34, f=34 where e=1 and g=1 ;
+--error ER_DUP_ENTRY
+update t1 set b=b+1, f=f+1 where a>0;
+update ignore t1 set b=b+1, f=f+1 where a>0;
+select * from t1 ;
+truncate table t1;
+insert into t1 values(1,1,1,1,1,1,1),(2,2,2,2,2,2,2),(3,3,3,3,3,3,3),(4,4,4,4,4,4,4),
+(5,5,5,5,5,5,5),(6,6,6,6,6,6,6),(7,7,7,7,7,7,7),(8,8,8,8,8,8,8),(9,9,9,9,9,9,9);
+--echo #key e_g
+--error ER_DUP_ENTRY
+update t1 set e=2 , g=2 where a=1;
+update  t1 set e=e+34, g=g+34 where a=1;
+update t1 set e=34, g=34 where e=1 and g=1 ;
+select * from t1 where  a=1;
+--error ER_DUP_ENTRY
+update t1 set e=e+1, g=g+1 where a>0;
+update ignore t1 set e=e+1, g=g+1 where a>0;
+select * from t1 ;
+drop table t1;
diff --git a/mysql-test/main/long_unique_using_hash.result b/mysql-test/main/long_unique_using_hash.result
new file mode 100644
index 00000000000..987e11294ec
--- /dev/null
+++ b/mysql-test/main/long_unique_using_hash.result
@@ -0,0 +1,54 @@
+create table t1(a blob , unique(a) using hash);
+show keys from t1;;
+Table	t1
+Non_unique	0
+Key_name	a
+Seq_in_index	1
+Column_name	a
+Collation	A
+Cardinality	NULL
+Sub_part	NULL
+Packed	NULL
+Null	YES
+Index_type	HASH
+Comment	
+Index_comment	
+drop table t1;
+create table t1(a blob , unique(a) using btree);
+ERROR 42000: Specified key was too long; max key length is 1000 bytes
+create table t1(a int , unique(a) using hash);
+show keys from t1;;
+Table	t1
+Non_unique	0
+Key_name	a
+Seq_in_index	1
+Column_name	a
+Collation	A
+Cardinality	NULL
+Sub_part	NULL
+Packed	NULL
+Null	YES
+Index_type	HASH
+Comment	
+Index_comment	
+drop table t1;
+create table t1(a int ,b int , c int,  unique(a, b, c) using hash);
+show keys from t1;
+Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment	Index_comment
+t1	0	a	1	a	A	NULL	NULL	NULL	YES	HASH		
+t1	0	a	2	b	A	NULL	NULL	NULL	YES	HASH		
+t1	0	a	3	c	A	NULL	NULL	NULL	YES	HASH		
+insert into t1 values(1,1,1);
+insert into t1 values(1,1,1);
+ERROR 23000: Duplicate entry '1-1-1' for key 'a'
+drop table t1;
+create table t1(a int ,b int , c int,  unique(a, b, c) using hash) engine=memory;
+show keys from t1;
+Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment	Index_comment
+t1	0	a	1	a	NULL	NULL	NULL	NULL	YES	HASH		
+t1	0	a	2	b	NULL	NULL	NULL	NULL	YES	HASH		
+t1	0	a	3	c	NULL	0	NULL	NULL	YES	HASH		
+insert into t1 values(1,1,1);
+insert into t1 values(1,1,1);
+ERROR 23000: Duplicate entry '1-1-1' for key 'a'
+drop table t1;
diff --git a/mysql-test/main/long_unique_using_hash.test b/mysql-test/main/long_unique_using_hash.test
new file mode 100644
index 00000000000..50f7a4e1920
--- /dev/null
+++ b/mysql-test/main/long_unique_using_hash.test
@@ -0,0 +1,25 @@
+
+create table t1(a blob , unique(a) using hash);
+--query_vertical show keys from t1;
+drop table t1;
+
+--error ER_TOO_LONG_KEY
+create table t1(a blob , unique(a) using btree);
+
+create table t1(a int , unique(a) using hash);
+--query_vertical show keys from t1;
+drop table t1;
+
+create table t1(a int ,b int , c int,  unique(a, b, c) using hash);
+show keys from t1;
+insert into t1 values(1,1,1);
+--error ER_DUP_ENTRY
+insert into t1 values(1,1,1);
+drop table t1;
+
+create table t1(a int ,b int , c int,  unique(a, b, c) using hash) engine=memory;
+show keys from t1;
+insert into t1 values(1,1,1);
+--error ER_DUP_ENTRY
+insert into t1 values(1,1,1);
+drop table t1;
diff --git a/mysql-test/main/type_blob.result b/mysql-test/main/type_blob.result
index 83a7f49f8c6..0654338a6ca 100644
--- a/mysql-test/main/type_blob.result
+++ b/mysql-test/main/type_blob.result
@@ -369,8 +369,6 @@ HELLO MY	1
 a	1
 hello	1
 drop table t1;
-create table t1 (a text, unique (a(2100)));
-ERROR 42000: Specified key was too long; max key length is 1000 bytes
 create table t1 (a text, key (a(2100)));
 Warnings:
 Note	1071	Specified key was too long; max key length is 1000 bytes
diff --git a/mysql-test/main/type_blob.test b/mysql-test/main/type_blob.test
index 4b5f3578e3a..993362c3298 100644
--- a/mysql-test/main/type_blob.test
+++ b/mysql-test/main/type_blob.test
@@ -131,8 +131,6 @@ select c,count(*) from t1 group by c;
 select d,count(*) from t1 group by d;
 drop table t1;
 
--- error 1071
-create table t1 (a text, unique (a(2100))); # should give an error
 create table t1 (a text, key (a(2100)));    # key is auto-truncated
 show create table t1;
 drop table t1;