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#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;
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