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Fix for bug#24395: 

ALTER TABLE DISABLE KEYS doesn't work when modifying the table
  
ENABLE|DISABLE KEYS combined with another ALTER TABLE option, different
than RENAME TO did nothing. Also, if the table had disabled keys
and was ALTER-ed then the end table was with enabled keys.
  
Fixed by checking whether the table had disabled keys and enabling them
in the copied table.


myisam/mi_open.c:
  Extend mi_indexes_are_disabled to implement return value
  2 - Non-unique indexes are disabled
mysql-test/r/alter_table.result:
  update result
mysql-test/t/alter_table.test:
  update test
sql/sql_table.cc:
  When ENABLE|DISABLE index is combined with another option
  different than RENAME TO, we should ENABLE|DISABLE the keys of
  the modified table. Also when modifying we should preserve the
  previous state of the indices.
  (This problem exists in 5.0 and 5.1 but since the codebase has
  diverged, this fix won't automerge, but the fix will be quite
  similar).
parent 4d2665f0
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Showing with 304 additions and 8 deletions
myisam/mi_open.c
View file @ a9173ec9
...@@ -1233,13 +1233,30 @@ int mi_enable_indexes(MI_INFO *info) ...@@ -1233,13 +1233,30 @@ int mi_enable_indexes(MI_INFO *info)
RETURN RETURN
0 indexes are not disabled 0 indexes are not disabled
1 all indexes are disabled 1 all indexes are disabled
[2 non-unique indexes are disabled - NOT YET IMPLEMENTED] 2 non-unique indexes are disabled
*/ */
int mi_indexes_are_disabled(MI_INFO *info) int mi_indexes_are_disabled(MI_INFO *info)
{ {
MYISAM_SHARE *share= info->s; MYISAM_SHARE *share= info->s;
return (! share->state.key_map && share->base.keys); /*
No keys or all are enabled. keys is the number of keys. Left shifted
gives us only one bit set. When decreased by one, gives us all all bits
up to this one set and it gets unset.
*/
if (!share->base.keys ||
(share->state.key_map == (ULL(1) << share->base.keys) - ULL(1)))
return 0;
/* All are disabled */
if (!share->state.key_map)
return 1;
/*
We have keys. Some enabled, some disabled.
Don't check for any non-unique disabled but return directly 2
*/
return 2;
} }
mysql-test/r/alter_table.result
View file @ a9173ec9
...@@ -528,6 +528,127 @@ create table t1 ( a timestamp ); ...@@ -528,6 +528,127 @@ create table t1 ( a timestamp );
alter table t1 add unique ( a(1) ); alter table t1 add unique ( a(1) );
ERROR HY000: Incorrect sub part key; the used key part isn't a string, the used length is longer than the key part, or the storage engine doesn't support unique sub keys ERROR HY000: Incorrect sub part key; the used key part isn't a string, the used length is longer than the key part, or the storage engine doesn't support unique sub keys
drop table t1; drop table t1;
drop table if exists t1;
create table t1 (a int, key(a));
show indexes from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
t1 1 a 1 a A NULL NULL NULL YES BTREE
"this used not to disable the index"
alter table t1 modify a int, disable keys;
show indexes from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
t1 1 a 1 a A NULL NULL NULL YES BTREE disabled
alter table t1 enable keys;
show indexes from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
t1 1 a 1 a A NULL NULL NULL YES BTREE
alter table t1 modify a bigint, disable keys;
show indexes from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
t1 1 a 1 a A NULL NULL NULL YES BTREE disabled
alter table t1 enable keys;
show indexes from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
t1 1 a 1 a A NULL NULL NULL YES BTREE
alter table t1 add b char(10), disable keys;
show indexes from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
t1 1 a 1 a A NULL NULL NULL YES BTREE disabled
alter table t1 add c decimal(10,2), enable keys;
show indexes from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
t1 1 a 1 a A NULL NULL NULL YES BTREE
"this however did"
alter table t1 disable keys;
show indexes from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
t1 1 a 1 a A NULL NULL NULL YES BTREE disabled
desc t1;
Field Type Null Key Default Extra
a bigint(20) YES MUL NULL
b char(10) YES NULL
c decimal(10,2) YES NULL
alter table t1 add d decimal(15,5);
"The key should still be disabled"
show indexes from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
t1 1 a 1 a A NULL NULL NULL YES BTREE disabled
drop table t1;
"Now will test with one unique index"
create table t1(a int, b char(10), unique(a));
show indexes from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
t1 0 a 1 a A NULL NULL NULL YES BTREE
alter table t1 disable keys;
show indexes from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
t1 0 a 1 a A NULL NULL NULL YES BTREE
alter table t1 enable keys;
"If no copy on noop change, this won't touch the data file"
"Unique index, no change"
alter table t1 modify a int, disable keys;
show indexes from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
t1 0 a 1 a A NULL NULL NULL YES BTREE
"Change the type implying data copy"
"Unique index, no change"
alter table t1 modify a bigint, disable keys;
show indexes from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
t1 0 a 1 a A NULL NULL NULL YES BTREE
alter table t1 modify a bigint;
show indexes from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
t1 0 a 1 a A NULL NULL NULL YES BTREE
alter table t1 modify a int;
show indexes from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
t1 0 a 1 a A NULL NULL NULL YES BTREE
drop table t1;
"Now will test with one unique and one non-unique index"
create table t1(a int, b char(10), unique(a), key(b));
show indexes from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
t1 0 a 1 a A NULL NULL NULL YES BTREE
t1 1 b 1 b A NULL NULL NULL YES BTREE
alter table t1 disable keys;
show indexes from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
t1 0 a 1 a A NULL NULL NULL YES BTREE
t1 1 b 1 b A NULL NULL NULL YES BTREE disabled
alter table t1 enable keys;
"If no copy on noop change, this won't touch the data file"
"The non-unique index will be disabled"
alter table t1 modify a int, disable keys;
show indexes from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
t1 0 a 1 a A NULL NULL NULL YES BTREE
t1 1 b 1 b A NULL NULL NULL YES BTREE disabled
alter table t1 enable keys;
show indexes from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
t1 0 a 1 a A NULL NULL NULL YES BTREE
t1 1 b 1 b A NULL NULL NULL YES BTREE
"Change the type implying data copy"
"The non-unique index will be disabled"
alter table t1 modify a bigint, disable keys;
show indexes from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
t1 0 a 1 a A NULL NULL NULL YES BTREE
t1 1 b 1 b A NULL NULL NULL YES BTREE disabled
"Change again the type, but leave the indexes as_is"
alter table t1 modify a int;
show indexes from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
t1 0 a 1 a A NULL NULL NULL YES BTREE
t1 1 b 1 b A NULL NULL NULL YES BTREE disabled
"Try the same. When data is no copied on similar tables, this is noop"
alter table t1 modify a int;
show indexes from t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment
t1 0 a 1 a A NULL NULL NULL YES BTREE
t1 1 b 1 b A NULL NULL NULL YES BTREE disabled
drop table t1;
create database mysqltest1; create database mysqltest1;
create table t1 (c1 int); create table t1 (c1 int);
alter table t1 rename mysqltest1.t1; alter table t1 rename mysqltest1.t1;
......
mysql-test/t/alter_table.test
View file @ a9173ec9
...@@ -361,6 +361,103 @@ create table t1 ( a timestamp ); ...@@ -361,6 +361,103 @@ create table t1 ( a timestamp );
alter table t1 add unique ( a(1) ); alter table t1 add unique ( a(1) );
drop table t1; drop table t1;
#
# Bug #24395: ALTER TABLE DISABLE KEYS doesn't work when modifying the table
#
# This problem happens if the data change is compatible.
# Changing to the same type is compatible for example.
#
--disable_warnings
drop table if exists t1;
--enable_warnings
create table t1 (a int, key(a));
show indexes from t1;
--echo "this used not to disable the index"
alter table t1 modify a int, disable keys;
show indexes from t1;
alter table t1 enable keys;
show indexes from t1;
alter table t1 modify a bigint, disable keys;
show indexes from t1;
alter table t1 enable keys;
show indexes from t1;
alter table t1 add b char(10), disable keys;
show indexes from t1;
alter table t1 add c decimal(10,2), enable keys;
show indexes from t1;
--echo "this however did"
alter table t1 disable keys;
show indexes from t1;
desc t1;
alter table t1 add d decimal(15,5);
--echo "The key should still be disabled"
show indexes from t1;
drop table t1;
--echo "Now will test with one unique index"
create table t1(a int, b char(10), unique(a));
show indexes from t1;
alter table t1 disable keys;
show indexes from t1;
alter table t1 enable keys;
--echo "If no copy on noop change, this won't touch the data file"
--echo "Unique index, no change"
alter table t1 modify a int, disable keys;
show indexes from t1;
--echo "Change the type implying data copy"
--echo "Unique index, no change"
alter table t1 modify a bigint, disable keys;
show indexes from t1;
alter table t1 modify a bigint;
show indexes from t1;
alter table t1 modify a int;
show indexes from t1;
drop table t1;
--echo "Now will test with one unique and one non-unique index"
create table t1(a int, b char(10), unique(a), key(b));
show indexes from t1;
alter table t1 disable keys;
show indexes from t1;
alter table t1 enable keys;
--echo "If no copy on noop change, this won't touch the data file"
--echo "The non-unique index will be disabled"
alter table t1 modify a int, disable keys;
show indexes from t1;
alter table t1 enable keys;
show indexes from t1;
--echo "Change the type implying data copy"
--echo "The non-unique index will be disabled"
alter table t1 modify a bigint, disable keys;
show indexes from t1;
--echo "Change again the type, but leave the indexes as_is"
alter table t1 modify a int;
show indexes from t1;
--echo "Try the same. When data is no copied on similar tables, this is noop"
alter table t1 modify a int;
show indexes from t1;
drop table t1;
# #
# Bug#11493 - Alter table rename to default database does not work without # Bug#11493 - Alter table rename to default database does not work without
# db name qualifying # db name qualifying
......
sql/sql_table.cc
View file @ a9173ec9
...@@ -38,7 +38,8 @@ static int copy_data_between_tables(TABLE *from,TABLE *to, ...@@ -38,7 +38,8 @@ static int copy_data_between_tables(TABLE *from,TABLE *to,
enum enum_duplicates handle_duplicates, enum enum_duplicates handle_duplicates,
bool ignore, bool ignore,
uint order_num, ORDER *order, uint order_num, ORDER *order,
ha_rows *copied,ha_rows *deleted); ha_rows *copied, ha_rows *deleted,
enum enum_enable_or_disable keys_onoff);
/* /*
...@@ -2836,6 +2837,54 @@ int mysql_drop_indexes(THD *thd, TABLE_LIST *table_list, ...@@ -2836,6 +2837,54 @@ int mysql_drop_indexes(THD *thd, TABLE_LIST *table_list,
#endif /* NOT_USED */ #endif /* NOT_USED */
/*
Manages enabling/disabling of indexes for ALTER TABLE
SYNOPSIS
alter_table_manage_keys()
table Target table
indexes_were_disabled Whether the indexes of the from table
were disabled
keys_onoff ENABLE | DISABLE | LEAVE_AS_IS
RETURN VALUES
FALSE OK
TRUE Error
*/
static
bool alter_table_manage_keys(TABLE *table, int indexes_were_disabled,
enum enum_enable_or_disable keys_onoff)
{
int error= 0;
DBUG_ENTER("alter_table_manage_keys");
DBUG_PRINT("enter", ("table=%p were_disabled=%d on_off=%d",
table, indexes_were_disabled, keys_onoff));
switch (keys_onoff) {
case ENABLE:
error= table->file->enable_indexes(HA_KEY_SWITCH_NONUNIQ_SAVE);
break;
case LEAVE_AS_IS:
if (!indexes_were_disabled)
break;
/* fall-through: disabled indexes */
case DISABLE:
error= table->file->disable_indexes(HA_KEY_SWITCH_NONUNIQ_SAVE);
}
if (error == HA_ERR_WRONG_COMMAND)
{
push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
ER_ILLEGAL_HA, ER(ER_ILLEGAL_HA), table->table_name);
error= 0;
} else if (error)
table->file->print_error(error, MYF(0));
DBUG_RETURN(error);
}
/* /*
Alter table Alter table
*/ */
...@@ -3375,7 +3424,14 @@ int mysql_alter_table(THD *thd,char *new_db, char *new_name, ...@@ -3375,7 +3424,14 @@ int mysql_alter_table(THD *thd,char *new_db, char *new_name,
if (!new_table->is_view) if (!new_table->is_view)
error=copy_data_between_tables(table,new_table,create_list, error=copy_data_between_tables(table,new_table,create_list,
handle_duplicates, ignore, handle_duplicates, ignore,
order_num, order, &copied, &deleted); order_num, order, &copied, &deleted,
alter_info->keys_onoff);
/*
No need to have call to alter_table_manage_keys() in the else because
in 4.1 we always copy data, except for views. In 5.0 it could happen
that no data is copied and only frm is modified. Then we have to handle
alter_info->keys_onoff outside of copy_data_between_tables
*/
thd->last_insert_id=next_insert_id; // Needed for correct log thd->last_insert_id=next_insert_id; // Needed for correct log
thd->count_cuted_fields= CHECK_FIELD_IGNORE; thd->count_cuted_fields= CHECK_FIELD_IGNORE;
...@@ -3598,7 +3654,8 @@ copy_data_between_tables(TABLE *from,TABLE *to, ...@@ -3598,7 +3654,8 @@ copy_data_between_tables(TABLE *from,TABLE *to,
bool ignore, bool ignore,
uint order_num, ORDER *order, uint order_num, ORDER *order,
ha_rows *copied, ha_rows *copied,
ha_rows *deleted) ha_rows *deleted,
enum enum_enable_or_disable keys_onoff)
{ {
int error; int error;
Copy_field *copy,*copy_end; Copy_field *copy,*copy_end;
...@@ -3630,6 +3687,10 @@ copy_data_between_tables(TABLE *from,TABLE *to, ...@@ -3630,6 +3687,10 @@ copy_data_between_tables(TABLE *from,TABLE *to,
if (to->file->external_lock(thd, F_WRLCK)) if (to->file->external_lock(thd, F_WRLCK))
DBUG_RETURN(-1); DBUG_RETURN(-1);
/* We need external lock before we can disable/enable keys */
alter_table_manage_keys(to, from->file->indexes_are_disabled(), keys_onoff);
from->file->info(HA_STATUS_VARIABLE); from->file->info(HA_STATUS_VARIABLE);
to->file->start_bulk_insert(from->file->records); to->file->start_bulk_insert(from->file->records);
......
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