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Commit 9c111e37 authored by davi@endora.local's avatar davi@endora.local
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Merge endora.local:/Users/davi/mysql/bugs/31397-5.1 

into  endora.local:/Users/davi/mysql/mysql-5.1-runtime
parents 4ca38aff 94e6e4ff
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Showing with 399 additions and 163 deletions
mysql-test/include/handler.inc
View file @ 9c111e37
......@@ -598,3 +598,97 @@ handler a2 read a last;
handler a2 read a prev;
handler a2 close;
drop table t1;
#
# Bug#31397 Inconsistent drop table behavior of handler tables.
#
--disable_warnings
drop table if exists t1,t2;
--enable_warnings
create table t1 (a int);
handler t1 open as t1_alias;
drop table t1;
create table t1 (a int);
handler t1 open as t1_alias;
flush tables;
drop table t1;
create table t1 (a int);
handler t1 open as t1_alias;
handler t1_alias close;
drop table t1;
create table t1 (a int);
handler t1 open as t1_alias;
handler t1_alias read first;
drop table t1;
--error ER_UNKNOWN_TABLE
handler t1_alias read next;
# Test that temporary tables associated with handlers are properly dropped.
create table t1 (a int);
create temporary table t2 (a int, key(a));
handler t1 open as a1;
handler t2 open as a2;
handler a2 read a first;
drop table t1, t2;
--error ER_UNKNOWN_TABLE
handler a2 read a next;
--error ER_UNKNOWN_TABLE
handler a1 close;
# Alter table drop handlers
create table t1 (a int, key(a));
create table t2 like t1;
handler t1 open as a1;
handler t2 open as a2;
handler a1 read a first;
handler a2 read a first;
alter table t1 add b int;
--error ER_UNKNOWN_TABLE
handler a1 close;
handler a2 close;
drop table t1, t2;
# Rename table drop handlers
create table t1 (a int, key(a));
handler t1 open as a1;
handler a1 read a first;
rename table t1 to t2;
--error ER_UNKNOWN_TABLE
handler a1 read a first;
drop table t2;
# Optimize table drop handlers
create table t1 (a int, key(a));
create table t2 like t1;
handler t1 open as a1;
handler t2 open as a2;
handler a1 read a first;
handler a2 read a first;
optimize table t1;
--error ER_UNKNOWN_TABLE
handler a1 close;
handler a2 close;
drop table t1, t2;
# Flush tables causes handlers reopen
create table t1 (a int, b char(1), key a(a), key b(a,b));
insert into t1 values (0,"a"),(1,"b"),(2,"c"),(3,"d"),(4,"e"),
(5,"f"),(6,"g"),(7,"h"),(8,"i"),(9,"j");
handler t1 open;
handler t1 read a first;
handler t1 read a next;
flush tables;
handler t1 read a next;
handler t1 read a next;
flush tables with read lock;
handler t1 read a next;
unlock tables;
drop table t1;
--error ER_UNKNOWN_TABLE
handler t1 read a next;
mysql-test/r/handler_innodb.result
View file @ 9c111e37
......@@ -637,3 +637,94 @@ a b
8 i
handler a2 close;
drop table t1;
drop table if exists t1,t2;
create table t1 (a int);
handler t1 open as t1_alias;
drop table t1;
create table t1 (a int);
handler t1 open as t1_alias;
flush tables;
drop table t1;
create table t1 (a int);
handler t1 open as t1_alias;
handler t1_alias close;
drop table t1;
create table t1 (a int);
handler t1 open as t1_alias;
handler t1_alias read first;
a
drop table t1;
handler t1_alias read next;
ERROR 42S02: Unknown table 't1_alias' in HANDLER
create table t1 (a int);
create temporary table t2 (a int, key(a));
handler t1 open as a1;
handler t2 open as a2;
handler a2 read a first;
a
drop table t1, t2;
handler a2 read a next;
ERROR 42S02: Unknown table 'a2' in HANDLER
handler a1 close;
ERROR 42S02: Unknown table 'a1' in HANDLER
create table t1 (a int, key(a));
create table t2 like t1;
handler t1 open as a1;
handler t2 open as a2;
handler a1 read a first;
a
handler a2 read a first;
a
alter table t1 add b int;
handler a1 close;
ERROR 42S02: Unknown table 'a1' in HANDLER
handler a2 close;
drop table t1, t2;
create table t1 (a int, key(a));
handler t1 open as a1;
handler a1 read a first;
a
rename table t1 to t2;
handler a1 read a first;
ERROR 42S02: Unknown table 'a1' in HANDLER
drop table t2;
create table t1 (a int, key(a));
create table t2 like t1;
handler t1 open as a1;
handler t2 open as a2;
handler a1 read a first;
a
handler a2 read a first;
a
optimize table t1;
Table Op Msg_type Msg_text
test.t1 optimize status OK
handler a1 close;
ERROR 42S02: Unknown table 'a1' in HANDLER
handler a2 close;
drop table t1, t2;
create table t1 (a int, b char(1), key a(a), key b(a,b));
insert into t1 values (0,"a"),(1,"b"),(2,"c"),(3,"d"),(4,"e"),
(5,"f"),(6,"g"),(7,"h"),(8,"i"),(9,"j");
handler t1 open;
handler t1 read a first;
a b
0 a
handler t1 read a next;
a b
1 b
flush tables;
handler t1 read a next;
a b
0 a
handler t1 read a next;
a b
1 b
flush tables with read lock;
handler t1 read a next;
a b
0 a
unlock tables;
drop table t1;
handler t1 read a next;
ERROR 42S02: Unknown table 't1' in HANDLER
mysql-test/r/handler_myisam.result
View file @ 9c111e37
......@@ -637,3 +637,94 @@ a b
8 i
handler a2 close;
drop table t1;
drop table if exists t1,t2;
create table t1 (a int);
handler t1 open as t1_alias;
drop table t1;
create table t1 (a int);
handler t1 open as t1_alias;
flush tables;
drop table t1;
create table t1 (a int);
handler t1 open as t1_alias;
handler t1_alias close;
drop table t1;
create table t1 (a int);
handler t1 open as t1_alias;
handler t1_alias read first;
a
drop table t1;
handler t1_alias read next;
ERROR 42S02: Unknown table 't1_alias' in HANDLER
create table t1 (a int);
create temporary table t2 (a int, key(a));
handler t1 open as a1;
handler t2 open as a2;
handler a2 read a first;
a
drop table t1, t2;
handler a2 read a next;
ERROR 42S02: Unknown table 'a2' in HANDLER
handler a1 close;
ERROR 42S02: Unknown table 'a1' in HANDLER
create table t1 (a int, key(a));
create table t2 like t1;
handler t1 open as a1;
handler t2 open as a2;
handler a1 read a first;
a
handler a2 read a first;
a
alter table t1 add b int;
handler a1 close;
ERROR 42S02: Unknown table 'a1' in HANDLER
handler a2 close;
drop table t1, t2;
create table t1 (a int, key(a));
handler t1 open as a1;
handler a1 read a first;
a
rename table t1 to t2;
handler a1 read a first;
ERROR 42S02: Unknown table 'a1' in HANDLER
drop table t2;
create table t1 (a int, key(a));
create table t2 like t1;
handler t1 open as a1;
handler t2 open as a2;
handler a1 read a first;
a
handler a2 read a first;
a
optimize table t1;
Table Op Msg_type Msg_text
test.t1 optimize status Table is already up to date
handler a1 close;
ERROR 42S02: Unknown table 'a1' in HANDLER
handler a2 close;
drop table t1, t2;
create table t1 (a int, b char(1), key a(a), key b(a,b));
insert into t1 values (0,"a"),(1,"b"),(2,"c"),(3,"d"),(4,"e"),
(5,"f"),(6,"g"),(7,"h"),(8,"i"),(9,"j");
handler t1 open;
handler t1 read a first;
a b
0 a
handler t1 read a next;
a b
1 b
flush tables;
handler t1 read a next;
a b
0 a
handler t1 read a next;
a b
1 b
flush tables with read lock;
handler t1 read a next;
a b
0 a
unlock tables;
drop table t1;
handler t1 read a next;
ERROR 42S02: Unknown table 't1' in HANDLER
sql/mysql_priv.h
View file @ 9c111e37
......@@ -1289,12 +1289,9 @@ bool mysql_ha_open(THD *thd, TABLE_LIST *tables, bool reopen);
bool mysql_ha_close(THD *thd, TABLE_LIST *tables);
bool mysql_ha_read(THD *, TABLE_LIST *,enum enum_ha_read_modes,char *,
List<Item> *,enum ha_rkey_function,Item *,ha_rows,ha_rows);
int mysql_ha_flush(THD *thd, TABLE_LIST *tables, uint mode_flags,
bool is_locked);
/* mysql_ha_flush mode_flags bits */
#define MYSQL_HA_CLOSE_FINAL 0x00
#define MYSQL_HA_REOPEN_ON_USAGE 0x01
#define MYSQL_HA_FLUSH_ALL 0x02
void mysql_ha_flush(THD *thd);
void mysql_ha_rm_tables(THD *thd, TABLE_LIST *tables);
void mysql_ha_cleanup(THD *thd);
/* sql_base.cc */
#define TMP_TABLE_KEY_EXTRA 8
......
sql/sql_base.cc
View file @ 9c111e37
......@@ -929,8 +929,8 @@ bool close_cached_tables(THD *thd, bool if_wait_for_refresh,
thd->proc_info="Flushing tables";
close_old_data_files(thd,thd->open_tables,1,1);
mysql_ha_flush(thd, tables, MYSQL_HA_REOPEN_ON_USAGE | MYSQL_HA_FLUSH_ALL,
TRUE);
mysql_ha_flush(thd);
bool found=1;
/* Wait until all threads has closed all the tables we had locked */
DBUG_PRINT("info",
......@@ -2516,7 +2516,7 @@ TABLE *open_table(THD *thd, TABLE_LIST *table_list, MEM_ROOT *mem_root,
deadlock may occur.
*/
if (thd->handler_tables)
mysql_ha_flush(thd, (TABLE_LIST*) NULL, MYSQL_HA_REOPEN_ON_USAGE, TRUE);
mysql_ha_flush(thd);
/*
Actually try to find the table in the open_cache.
......@@ -3136,7 +3136,7 @@ bool wait_for_tables(THD *thd)
{
thd->some_tables_deleted=0;
close_old_data_files(thd,thd->open_tables,0,dropping_tables != 0);
mysql_ha_flush(thd, (TABLE_LIST*) NULL, MYSQL_HA_REOPEN_ON_USAGE, TRUE);
mysql_ha_flush(thd);
if (!table_is_used(thd->open_tables,1))
break;
(void) pthread_cond_wait(&COND_refresh,&LOCK_open);
......
sql/sql_class.cc
View file @ 9c111e37
......@@ -678,9 +678,7 @@ void THD::cleanup(void)
lock=locked_tables; locked_tables=0;
close_thread_tables(this);
}
mysql_ha_flush(this, (TABLE_LIST*) 0,
MYSQL_HA_CLOSE_FINAL | MYSQL_HA_FLUSH_ALL, FALSE);
hash_free(&handler_tables_hash);
mysql_ha_cleanup(this);
delete_dynamic(&user_var_events);
hash_free(&user_vars);
close_temporary_tables(this);
......
sql/sql_handler.cc
View file @ 9c111e37
......@@ -65,9 +65,6 @@
static enum enum_ha_read_modes rkey_to_rnext[]=
{ RNEXT_SAME, RNEXT, RPREV, RNEXT, RPREV, RNEXT, RPREV, RPREV };
static int mysql_ha_flush_table(THD *thd, TABLE **table_ptr, uint mode_flags);
/*
Get hash key and hash key length.
......@@ -119,13 +116,15 @@ static void mysql_ha_hash_free(TABLE_LIST *tables)
@param thd Thread identifier.
@param tables A list of tables with the first entry to close.
@param is_locked If LOCK_open is locked.
@note Though this function takes a list of tables, only the first list entry
will be closed.
@note Broadcasts refresh if it closed the table.
@note Broadcasts refresh if it closed a table with old version.
*/
static void mysql_ha_close_table(THD *thd, TABLE_LIST *tables)
static void mysql_ha_close_table(THD *thd, TABLE_LIST *tables,
bool is_locked)
{
TABLE **table_ptr;
......@@ -143,13 +142,15 @@ static void mysql_ha_close_table(THD *thd, TABLE_LIST *tables)
if (*table_ptr)
{
(*table_ptr)->file->ha_index_or_rnd_end();
VOID(pthread_mutex_lock(&LOCK_open));
if (! is_locked)
VOID(pthread_mutex_lock(&LOCK_open));
if (close_thread_table(thd, table_ptr))
{
/* Tell threads waiting for refresh that something has happened */
broadcast_refresh();
}
VOID(pthread_mutex_unlock(&LOCK_open));
if (! is_locked)
VOID(pthread_mutex_unlock(&LOCK_open));
}
else if (tables->table)
{
......@@ -305,7 +306,7 @@ bool mysql_ha_open(THD *thd, TABLE_LIST *tables, bool reopen)
if (hash_tables)
my_free((char*) hash_tables, MYF(0));
if (tables->table)
mysql_ha_close_table(thd, tables);
mysql_ha_close_table(thd, tables, FALSE);
DBUG_PRINT("exit",("ERROR"));
DBUG_RETURN(TRUE);
}
......@@ -339,7 +340,7 @@ bool mysql_ha_close(THD *thd, TABLE_LIST *tables)
(uchar*) tables->alias,
strlen(tables->alias) + 1)))
{
mysql_ha_close_table(thd, hash_tables);
mysql_ha_close_table(thd, hash_tables, FALSE);
hash_delete(&thd->handler_tables_hash, (uchar*) hash_tables);
}
else
......@@ -478,7 +479,7 @@ bool mysql_ha_read(THD *thd, TABLE_LIST *tables,
if (need_reopen)
{
mysql_ha_close_table(thd, tables);
mysql_ha_close_table(thd, tables, FALSE);
hash_tables->table= NULL;
/*
The lock might have been aborted, we need to manually reset
......@@ -669,163 +670,131 @@ bool mysql_ha_read(THD *thd, TABLE_LIST *tables,
}
/*
Flush (close) a list of HANDLER tables.
SYNOPSIS
mysql_ha_flush()
thd Thread identifier.
tables The list of tables to close. If NULL,
close all HANDLER tables [marked as flushed].
mode_flags MYSQL_HA_CLOSE_FINAL finally close the table.
MYSQL_HA_REOPEN_ON_USAGE mark for reopen.
MYSQL_HA_FLUSH_ALL flush all tables, not only
those marked for flush.
is_locked If LOCK_open is locked.
DESCRIPTION
The list of HANDLER tables may be NULL, in which case all HANDLER
tables are closed (if MYSQL_HA_FLUSH_ALL) is set.
If 'tables' is NULL and MYSQL_HA_FLUSH_ALL is not set,
all HANDLER tables marked for flush are closed.
Broadcasts refresh for every table closed.
/**
Scan the handler tables hash for matching tables.
NOTE
Since mysql_ha_flush() is called when the base table has to be closed,
we compare real table names, not aliases. Hence, database names matter.
@param thd Thread identifier.
@param tables The list of tables to remove.
RETURN
0 ok
@return Pointer to head of linked list (TABLE_LIST::next_local) of matching
TABLE_LIST elements from handler_tables_hash. Otherwise, NULL if no
table was matched.
*/
int mysql_ha_flush(THD *thd, TABLE_LIST *tables, uint mode_flags,
bool is_locked)
static TABLE_LIST *mysql_ha_find(THD *thd, TABLE_LIST *tables)
{
TABLE_LIST *tmp_tables;
TABLE **table_ptr;
bool did_lock= FALSE;
DBUG_ENTER("mysql_ha_flush");
DBUG_PRINT("enter", ("tables: 0x%lx mode_flags: 0x%02x",
(long) tables, mode_flags));
TABLE_LIST *hash_tables, *head= NULL, *first= tables;
DBUG_ENTER("mysql_ha_find");
if (tables)
/* search for all handlers with matching table names */
for (uint i= 0; i < thd->handler_tables_hash.records; i++)
{
/* Close all tables in the list. */
for (tmp_tables= tables ; tmp_tables; tmp_tables= tmp_tables->next_local)
hash_tables= (TABLE_LIST*) hash_element(&thd->handler_tables_hash, i);
for (tables= first; tables; tables= tables->next_local)
{
DBUG_PRINT("info-in-tables-list",("'%s'.'%s' as '%s'",
tmp_tables->db, tmp_tables->table_name,
tmp_tables->alias));
/* Close all currently open handler tables with the same base table. */
table_ptr= &(thd->handler_tables);
while (*table_ptr)
{
if ((!*tmp_tables->db ||
!my_strcasecmp(&my_charset_latin1, (*table_ptr)->s->db.str,
tmp_tables->db)) &&
! my_strcasecmp(&my_charset_latin1,
(*table_ptr)->s->table_name.str,
tmp_tables->table_name))
{
DBUG_PRINT("info",("*table_ptr '%s'.'%s' as '%s'",
(*table_ptr)->s->db.str,
(*table_ptr)->s->table_name.str,
(*table_ptr)->alias));
/* The first time it is required, lock for close_thread_table(). */
if (! did_lock && ! is_locked)
{
VOID(pthread_mutex_lock(&LOCK_open));
did_lock= TRUE;
}
mysql_ha_flush_table(thd, table_ptr, mode_flags);
continue;
}
table_ptr= &(*table_ptr)->next;
}
/* end of handler_tables list */
if ((! *tables->db ||
! my_strcasecmp(&my_charset_latin1, hash_tables->db, tables->db)) &&
! my_strcasecmp(&my_charset_latin1, hash_tables->table_name,
tables->table_name))
break;
}
/* end of flush tables list */
}
else
{
/* Close all currently open tables [which are marked for flush]. */
table_ptr= &(thd->handler_tables);
while (*table_ptr)
if (tables)
{
if ((mode_flags & MYSQL_HA_FLUSH_ALL) ||
(*table_ptr)->needs_reopen_or_name_lock())
{
/* The first time it is required, lock for close_thread_table(). */
if (! did_lock && ! is_locked)
{
VOID(pthread_mutex_lock(&LOCK_open));
did_lock= TRUE;
}
mysql_ha_flush_table(thd, table_ptr, mode_flags);
continue;
}
table_ptr= &(*table_ptr)->next;
hash_tables->next_local= head;
head= hash_tables;
}
}
/* Release the lock if it was taken by this function. */
if (did_lock)
VOID(pthread_mutex_unlock(&LOCK_open));
DBUG_RETURN(head);
}
/**
Remove matching tables from the HANDLER's hash table.
@param thd Thread identifier.
@param tables The list of tables to remove.
@note Broadcasts refresh if it closed a table with old version.
*/
void mysql_ha_rm_tables(THD *thd, TABLE_LIST *tables)
{
TABLE_LIST *hash_tables, *next;
DBUG_ENTER("mysql_ha_rm_tables");
safe_mutex_assert_not_owner(&LOCK_open);
DBUG_ASSERT(tables);
DBUG_RETURN(0);
hash_tables= mysql_ha_find(thd, tables);
while (hash_tables)
{
next= hash_tables->next_local;
if (hash_tables->table)
mysql_ha_close_table(thd, hash_tables, FALSE);
hash_delete(&thd->handler_tables_hash, (uchar*) hash_tables);
hash_tables= next;
}
DBUG_VOID_RETURN;
}
/*
Flush (close) a table.
SYNOPSIS
mysql_ha_flush_table()
thd Thread identifier.
table The table to close.
mode_flags MYSQL_HA_CLOSE_FINAL finally close the table.
MYSQL_HA_REOPEN_ON_USAGE mark for reopen.
/**
Flush (close and mark for re-open) all tables that should be should
be reopen.
DESCRIPTION
Broadcasts refresh if it closed the table.
The caller must lock LOCK_open.
@param thd Thread identifier.
RETURN
0 ok
@note Broadcasts refresh if it closed a table with old version.
*/
static int mysql_ha_flush_table(THD *thd, TABLE **table_ptr, uint mode_flags)
void mysql_ha_flush(THD *thd)
{
TABLE_LIST *hash_tables;
TABLE *table= *table_ptr;
DBUG_ENTER("mysql_ha_flush_table");
DBUG_PRINT("enter",("'%s'.'%s' as '%s' flags: 0x%02x",
table->s->db.str, table->s->table_name.str,
table->alias, mode_flags));
TABLE_LIST *hash_tables;
DBUG_ENTER("mysql_ha_flush");
if ((hash_tables= (TABLE_LIST*) hash_search(&thd->handler_tables_hash,
(uchar*) table->alias,
strlen(table->alias) + 1)))
safe_mutex_assert_owner(&LOCK_open);
for (uint i= 0; i < thd->handler_tables_hash.records; i++)
{
if (! (mode_flags & MYSQL_HA_REOPEN_ON_USAGE))
{
/* This is a final close. Remove from hash. */
hash_delete(&thd->handler_tables_hash, (uchar*) hash_tables);
}
else
hash_tables= (TABLE_LIST*) hash_element(&thd->handler_tables_hash, i);
if (hash_tables->table && hash_tables->table->needs_reopen_or_name_lock())
{
mysql_ha_close_table(thd, hash_tables, TRUE);
/* Mark table as closed, ready for re-open. */
hash_tables->table= NULL;
}
}
}
safe_mutex_assert_owner(&LOCK_open);
(*table_ptr)->file->ha_index_or_rnd_end();
safe_mutex_assert_owner(&LOCK_open);
if (close_thread_table(thd, table_ptr))
DBUG_VOID_RETURN;
}
/**
Close all HANDLER's tables.
@param thd Thread identifier.
@note Broadcasts refresh if it closed a table with old version.
*/
void mysql_ha_cleanup(THD *thd)
{
TABLE_LIST *hash_tables;
DBUG_ENTER("mysql_ha_cleanup");
for (uint i= 0; i < thd->handler_tables_hash.records; i++)
{
/* Tell threads waiting for refresh that something has happened */
broadcast_refresh();
}
hash_tables= (TABLE_LIST*) hash_element(&thd->handler_tables_hash, i);
if (hash_tables->table)
mysql_ha_close_table(thd, hash_tables, FALSE);
}
DBUG_RETURN(0);
hash_free(&thd->handler_tables_hash);
DBUG_VOID_RETURN;
}
sql/sql_rename.cc
View file @ 9c111e37
......@@ -51,6 +51,8 @@ bool mysql_rename_tables(THD *thd, TABLE_LIST *table_list, bool silent)
DBUG_RETURN(1);
}
mysql_ha_rm_tables(thd, table_list);
if (wait_if_global_read_lock(thd,0,1))
DBUG_RETURN(1);
......
sql/sql_table.cc
View file @ 9c111e37
......@@ -1521,6 +1521,8 @@ int mysql_rm_table_part2(THD *thd, TABLE_LIST *tables, bool if_exists,
built_query.append("DROP TABLE ");
}
mysql_ha_rm_tables(thd, tables);
pthread_mutex_lock(&LOCK_open);
/*
......@@ -1562,8 +1564,6 @@ int mysql_rm_table_part2(THD *thd, TABLE_LIST *tables, bool if_exists,
handlerton *table_type;
enum legacy_db_type frm_db_type;
mysql_ha_flush(thd, table, MYSQL_HA_CLOSE_FINAL, 1);
error= drop_temporary_table(thd, table);
switch (error) {
......@@ -1572,13 +1572,7 @@ int mysql_rm_table_part2(THD *thd, TABLE_LIST *tables, bool if_exists,
tmp_table_deleted= 1;
continue;
case -1:
// table already in use
/*
XXX: This branch should never be taken outside of SF, trigger or
prelocked mode.
DBUG_ASSERT(thd->in_sub_stmt);
*/
DBUG_ASSERT(thd->in_sub_stmt);
error= 1;
goto err_with_placeholders;
default:
......@@ -4025,7 +4019,8 @@ static bool mysql_admin_table(THD* thd, TABLE_LIST* tables,
Protocol::SEND_NUM_ROWS | Protocol::SEND_EOF))
DBUG_RETURN(TRUE);
mysql_ha_flush(thd, tables, MYSQL_HA_CLOSE_FINAL, FALSE);
mysql_ha_rm_tables(thd, tables);
for (table= tables; table; table= table->next_local)
{
char table_name[NAME_LEN*2+2];
......@@ -5766,8 +5761,7 @@ bool mysql_alter_table(THD *thd,char *new_db, char *new_name,
build_table_filename(reg_path, sizeof(reg_path), db, table_name, reg_ext, 0);
build_table_filename(path, sizeof(path), db, table_name, "", 0);
mysql_ha_flush(thd, table_list, MYSQL_HA_CLOSE_FINAL, FALSE);
mysql_ha_rm_tables(thd, table_list);
/* DISCARD/IMPORT TABLESPACE is always alone in an ALTER TABLE */
if (alter_info->tablespace_op != NO_TABLESPACE_OP)
......
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