Merge bk-internal.mysql.com:/home/bk/mysql-5.0-runtime

into  mockturtle.local:/home/dlenev/src/mysql-5.0-cts-3


sql/mysql_priv.h:
  Auto merged
sql/sql_insert.cc:
  Auto merged
sql/sql_prepare.cc:
  Auto merged
sql/sql_yacc.yy:
  Auto merged

mysql-test/r/create.result

@@ -769,6 +769,100 @@ t1	CREATE TABLE `t1` (
   `i` int(11) default NULL
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1 MAX_ROWS=4294967295
 drop table t1;
+create table t1 select * from t2;
+ERROR 42S02: Table 'test.t2' doesn't exist
+create table t1 select * from t1;
+ERROR HY000: You can't specify target table 't1' for update in FROM clause
+create table t1 select coalesce('a' collate latin1_swedish_ci,'b' collate latin1_bin);
+ERROR HY000: Illegal mix of collations (latin1_swedish_ci,EXPLICIT) and (latin1_bin,EXPLICIT) for operation 'coalesce'
+create table t1 (primary key(a)) select "b" as b;
+ERROR 42000: Key column 'a' doesn't exist in table
+create table t1 (a int);
+create table if not exists t1 select 1 as a, 2 as b;
+ERROR 21S01: Column count doesn't match value count at row 1
+drop table t1;
+create table t1 (primary key (a)) (select 1 as a) union all (select 1 as a);
+ERROR 23000: Duplicate entry '1' for key 1
+create table t1 (i int);
+create table t1 select 1 as i;
+ERROR 42S01: Table 't1' already exists
+create table if not exists t1 select 1 as i;
+Warnings:
+Note	1050	Table 't1' already exists
+select * from t1;
+i
+1
+create table t1 select coalesce('a' collate latin1_swedish_ci,'b' collate latin1_bin);
+ERROR HY000: Illegal mix of collations (latin1_swedish_ci,EXPLICIT) and (latin1_bin,EXPLICIT) for operation 'coalesce'
+select * from t1;
+i
+1
+alter table t1 add primary key (i);
+create table if not exists t1 (select 2 as i) union all (select 2 as i);
+ERROR 23000: Duplicate entry '2' for key 1
+select * from t1;
+i
+1
+2
+drop table t1;
+create temporary table t1 (j int);
+create table if not exists t1 select 1;
+Warnings:
+Note	1050	Table 't1' already exists
+select * from t1;
+j
+1
+drop temporary table t1;
+select * from t1;
+ERROR 42S02: Table 'test.t1' doesn't exist
+drop table t1;
+ERROR 42S02: Unknown table 't1'
+create table t1 (i int);
+insert into t1 values (1), (2);
+lock tables t1 read;
+create table t2 select * from t1;
+ERROR HY000: Table 't2' was not locked with LOCK TABLES
+create table if not exists t2 select * from t1;
+ERROR HY000: Table 't2' was not locked with LOCK TABLES
+unlock tables;
+create table t2 (j int);
+lock tables t1 read;
+create table t2 select * from t1;
+ERROR HY000: Table 't2' was not locked with LOCK TABLES
+create table if not exists t2 select * from t1;
+ERROR HY000: Table 't2' was not locked with LOCK TABLES
+unlock tables;
+lock table t1 read, t2 read;
+create table t2 select * from t1;
+ERROR HY000: Table 't2' was locked with a READ lock and can't be updated
+create table if not exists t2 select * from t1;
+ERROR HY000: Table 't2' was locked with a READ lock and can't be updated
+unlock tables;
+lock table t1 read, t2 write;
+create table t2 select * from t1;
+ERROR 42S01: Table 't2' already exists
+create table if not exists t2 select * from t1;
+Warnings:
+Note	1050	Table 't2' already exists
+select * from t1;
+i
+1
+2
+unlock tables;
+drop table t2;
+lock tables t1 read;
+create temporary table t2 select * from t1;
+create temporary table if not exists t2 select * from t1;
+Warnings:
+Note	1050	Table 't2' already exists
+select * from t2;
+i
+1
+2
+1
+2
+unlock tables;
+drop table t1, t2;
 create table t1 (upgrade int);
 drop table t1;
 End of 5.0 tests

mysql-test/r/trigger.result

@@ -1414,4 +1414,39 @@ id	val
 DROP TRIGGER trg27006_a_insert;
 DROP TRIGGER trg27006_a_update;
 drop table t1,t2;
+drop table if exists t1, t2, t3;
+create table t1 (i int);
+create trigger t1_bi before insert on t1 for each row set new.i = 7;
+create trigger t1_ai after insert on t1 for each row set @a := 7;
+create table t2 (j int);
+insert into t2 values (1), (2);
+set @a:="";
+create table if not exists t1 select * from t2;
+Warnings:
+Note	1050	Table 't1' already exists
+select * from t1;
+i
+7
+7
+select @a;
+@a
+7
+drop trigger t1_bi;
+drop trigger t1_ai;
+create table t3 (isave int);
+create trigger t1_bi before insert on t1 for each row insert into t3 values (new.i);
+create table if not exists t1 select * from t2;
+Warnings:
+Note	1050	Table 't1' already exists
+select * from t1;
+i
+7
+7
+1
+2
+select * from t3;
+isave
+1
+2
+drop table t1, t2, t3;
 End of 5.0 tests

mysql-test/t/create.test

@@ -669,6 +669,117 @@ alter table t1 max_rows=100000000000;
 show create table t1;
 drop table t1;
 
+
+#
+# Tests for errors happening at various stages of CREATE TABLES ... SELECT
+#
+# (Also checks that it behaves atomically in the sense that in case
+#  of error it is automatically dropped if it has not existed before.)
+#
+# Error during open_and_lock_tables() of tables
+--error ER_NO_SUCH_TABLE
+create table t1 select * from t2;
+# Rather special error which also caught during open tables pahse
+--error ER_UPDATE_TABLE_USED
+create table t1 select * from t1;
+# Error which happens before select_create::prepare()
+--error ER_CANT_AGGREGATE_2COLLATIONS
+create table t1 select coalesce('a' collate latin1_swedish_ci,'b' collate latin1_bin);
+# Error during table creation
+--error ER_KEY_COLUMN_DOES_NOT_EXITS
+create table t1 (primary key(a)) select "b" as b;
+# Error in select_create::prepare() which is not related to table creation
+create table t1 (a int);
+--error ER_WRONG_VALUE_COUNT_ON_ROW
+create table if not exists t1 select 1 as a, 2 as b;
+drop table t1;
+# Finally error which happens during insert
+--error ER_DUP_ENTRY
+create table t1 (primary key (a)) (select 1 as a) union all (select 1 as a);
+# What happens if table already exists ?
+create table t1 (i int);
+--error ER_TABLE_EXISTS_ERROR
+create table t1 select 1 as i;
+create table if not exists t1 select 1 as i;
+select * from t1;
+# Error before select_create::prepare()
+--error ER_CANT_AGGREGATE_2COLLATIONS
+create table t1 select coalesce('a' collate latin1_swedish_ci,'b' collate latin1_bin);
+select * from t1;
+# Error which happens during insertion of rows
+alter table t1 add primary key (i);
+--error ER_DUP_ENTRY
+create table if not exists t1 (select 2 as i) union all (select 2 as i);
+select * from t1;
+drop table t1;
+
+
+# Base vs temporary tables dillema (a.k.a. bug#24508 "Inconsistent
+# results of CREATE TABLE ... SELECT when temporary table exists").
+# In this situation we either have to create non-temporary table and
+# insert data in it or insert data in temporary table without creation
+# of permanent table. Since currently temporary tables always shadow
+# permanent tables we adopt second approach.
+create temporary table t1 (j int);
+create table if not exists t1 select 1;
+select * from t1;
+drop temporary table t1;
+--error ER_NO_SUCH_TABLE
+select * from t1;
+--error ER_BAD_TABLE_ERROR
+drop table t1;
+
+
+#
+# CREATE TABLE ... SELECT and LOCK TABLES
+#
+# There is little sense in using CREATE TABLE ... SELECT under
+# LOCK TABLES as it mostly does not work. At least we check that
+# the server doesn't crash, hang and produces sensible errors.
+# Includes test for bug #20662 "Infinite loop in CREATE TABLE
+# IF NOT EXISTS ... SELECT with locked tables".
+create table t1 (i int);
+insert into t1 values (1), (2);
+lock tables t1 read;
+--error ER_TABLE_NOT_LOCKED
+create table t2 select * from t1;
+--error ER_TABLE_NOT_LOCKED
+create table if not exists t2 select * from t1;
+unlock tables;
+create table t2 (j int);
+lock tables t1 read;
+--error ER_TABLE_NOT_LOCKED
+create table t2 select * from t1;
+# This should not be ever allowed as it will undermine
+# lock-all-at-once approach
+--error ER_TABLE_NOT_LOCKED
+create table if not exists t2 select * from t1;
+unlock tables;
+lock table t1 read, t2 read;
+--error ER_TABLE_NOT_LOCKED_FOR_WRITE
+create table t2 select * from t1;
+--error ER_TABLE_NOT_LOCKED_FOR_WRITE
+create table if not exists t2 select * from t1;
+unlock tables;
+lock table t1 read, t2 write;
+--error ER_TABLE_EXISTS_ERROR
+create table t2 select * from t1;
+# This is the only case which really works.
+create table if not exists t2 select * from t1;
+select * from t1;
+unlock tables;
+drop table t2;
+
+# OTOH CREATE TEMPORARY TABLE ... SELECT should work
+# well under LOCK TABLES.
+lock tables t1 read;
+create temporary table t2 select * from t1;
+create temporary table if not exists t2 select * from t1;
+select * from t2;
+unlock tables;
+drop table t1, t2;
+
+
 #
 # Bug#21772: can not name a column 'upgrade' when create a table
 #

mysql-test/t/trigger.test

@@ -1737,4 +1737,30 @@ DROP TRIGGER trg27006_a_insert;
 DROP TRIGGER trg27006_a_update;
 drop table t1,t2;
 
+#
+# Bug #20903 "Crash when using CREATE TABLE .. SELECT and triggers"
+#
+
+--disable_warnings
+drop table if exists t1, t2, t3;
+--enable_warnings
+create table t1 (i int);
+create trigger t1_bi before insert on t1 for each row set new.i = 7;
+create trigger t1_ai after insert on t1 for each row set @a := 7;
+create table t2 (j int);
+insert into t2 values (1), (2);
+set @a:="";
+create table if not exists t1 select * from t2;
+select * from t1;
+select @a;
+# Let us check that trigger that involves table also works ok.
+drop trigger t1_bi;
+drop trigger t1_ai;
+create table t3 (isave int);
+create trigger t1_bi before insert on t1 for each row insert into t3 values (new.i);
+create table if not exists t1 select * from t2;
+select * from t1;
+select * from t3;
+drop table t1, t2, t3;
+
 --echo End of 5.0 tests

sql/lock.cc

@@ -853,7 +853,6 @@ int lock_table_name(THD *thd, TABLE_LIST *table_list)
   TABLE *table;
   char  key[MAX_DBKEY_LENGTH];
   char *db= table_list->db;
-  int table_in_key_offset;
   uint  key_length;
   HASH_SEARCH_STATE state;
   DBUG_ENTER("lock_table_name");
@@ -861,10 +860,8 @@ int lock_table_name(THD *thd, TABLE_LIST *table_list)
 
   safe_mutex_assert_owner(&LOCK_open);
 
-  table_in_key_offset= strmov(key, db) - key + 1;
-  key_length= (uint)(strmov(key + table_in_key_offset, table_list->table_name)
-                     - key) + 1;
-
+  key_length= (uint)(strmov(strmov(key, db) + 1, table_list->table_name) -
+                     key) + 1;
 
   /* Only insert the table if we haven't insert it already */
   for (table=(TABLE*) hash_first(&open_cache, (byte*)key, key_length, &state);
@@ -873,28 +870,10 @@ int lock_table_name(THD *thd, TABLE_LIST *table_list)
     if (table->in_use == thd)
       DBUG_RETURN(0);
 
-  /*
-    Create a table entry with the right key and with an old refresh version
-    Note that we must use my_malloc() here as this is freed by the table
-    cache
-  */
-  if (!(table= (TABLE*) my_malloc(sizeof(*table)+key_length,
-				  MYF(MY_WME | MY_ZEROFILL))))
+  if (!(table= table_cache_insert_placeholder(thd, key, key_length)))
     DBUG_RETURN(-1);
-  table->s= &table->share_not_to_be_used;
-  memcpy((table->s->table_cache_key= (char*) (table+1)), key, key_length);
-  table->s->db= table->s->table_cache_key;
-  table->s->table_name= table->s->table_cache_key + table_in_key_offset;
-  table->s->key_length=key_length;
-  table->in_use=thd;
-  table->locked_by_name=1;
-  table_list->table=table;
-
-  if (my_hash_insert(&open_cache, (byte*) table))
-  {
-    my_free((gptr) table,MYF(0));
-    DBUG_RETURN(-1);
-  }
+
+  table_list->table= table;
 
   /* Return 1 if table is in use */
   DBUG_RETURN(test(remove_table_from_cache(thd, db, table_list->table_name,

sql/mysql_priv.h

@@ -676,6 +676,8 @@ struct Query_cache_query_flags
 #define query_cache_invalidate_by_MyISAM_filename_ref NULL
 #endif /*HAVE_QUERY_CACHE*/
 
+uint build_table_path(char *buff, size_t bufflen, const char *db,
+                      const char *table, const char *ext);
 bool mysql_create_db(THD *thd, char *db, HA_CREATE_INFO *create, bool silent);
 bool mysql_alter_db(THD *thd, const char *db, HA_CREATE_INFO *create);
 bool mysql_rm_db(THD *thd,char *db,bool if_exists, bool silent);
@@ -858,12 +860,14 @@ bool mysql_create_or_drop_trigger(THD *thd, TABLE_LIST *tables, bool create);
 TABLE *open_ltable(THD *thd, TABLE_LIST *table_list, thr_lock_type update);
 TABLE *open_table(THD *thd, TABLE_LIST *table_list, MEM_ROOT* mem,
 		  bool *refresh, uint flags);
-bool reopen_name_locked_table(THD* thd, TABLE_LIST* table);
+bool reopen_name_locked_table(THD* thd, TABLE_LIST* table_list, bool link_in);
+TABLE *table_cache_insert_placeholder(THD *thd, const char *key,
+                                      uint key_length);
+bool table_cache_has_open_placeholder(THD *thd, const char *db,
+                                      const char *table_name);
 TABLE *find_locked_table(THD *thd, const char *db,const char *table_name);
 bool reopen_table(TABLE *table,bool locked);
 bool reopen_tables(THD *thd,bool get_locks,bool in_refresh);
-void close_old_data_files(THD *thd, TABLE *table, bool abort_locks,
-			  bool send_refresh);
 bool close_data_tables(THD *thd,const char *db, const char *table_name);
 bool wait_for_tables(THD *thd);
 bool table_is_used(TABLE *table, bool wait_for_name_lock);
@@ -1019,6 +1023,8 @@ void add_join_natural(TABLE_LIST *a,TABLE_LIST *b,List<String> *using_fields,
                       SELECT_LEX *lex);
 bool add_proc_to_list(THD *thd, Item *item);
 TABLE *unlink_open_table(THD *thd,TABLE *list,TABLE *find);
+void drop_open_table(THD *thd, TABLE *table, const char *db_name,
+                     const char *table_name);
 void update_non_unique_table_error(TABLE_LIST *update,
                                    const char *operation,
                                    TABLE_LIST *duplicate);
@@ -1271,7 +1277,7 @@ extern double log_01[32];
 extern ulonglong log_10_int[20];
 extern ulonglong keybuff_size;
 extern ulonglong thd_startup_options;
-extern ulong refresh_version,flush_version, thread_id;
+extern ulong flush_version, thread_id;
 extern ulong binlog_cache_use, binlog_cache_disk_use;
 extern ulong aborted_threads,aborted_connects;
 extern ulong delayed_insert_timeout;
@@ -1445,7 +1451,7 @@ MYSQL_LOCK *mysql_lock_tables(THD *thd, TABLE **table, uint count,
 #define MYSQL_LOCK_IGNORE_GLOBAL_READ_LOCK      0x0001
 #define MYSQL_LOCK_IGNORE_FLUSH                 0x0002
 #define MYSQL_LOCK_NOTIFY_IF_NEED_REOPEN        0x0004
-#define MYSQL_OPEN_IGNORE_LOCKED_TABLES         0x0008
+#define MYSQL_OPEN_TEMPORARY_ONLY               0x0008
 
 void mysql_unlock_tables(THD *thd, MYSQL_LOCK *sql_lock);
 void mysql_unlock_read_tables(THD *thd, MYSQL_LOCK *sql_lock);

sql/sql_handler.cc

@@ -670,7 +670,7 @@ int mysql_ha_flush(THD *thd, TABLE_LIST *tables, uint mode_flags,
     while (*table_ptr)
     {
       if ((mode_flags & MYSQL_HA_FLUSH_ALL) ||
-          ((*table_ptr)->s->version != refresh_version))
+          (*table_ptr)->needs_reopen_or_name_lock())
       {
         /* The first time it is required, lock for close_thread_table(). */
         if (! did_lock && ! is_locked)
@@ -770,6 +770,12 @@ void mysql_ha_mark_tables_for_reopen(THD *thd, TABLE *table)
 
   safe_mutex_assert_owner(&LOCK_open);
   for (; table; table= table->next)
+  {
+    /*
+      Some elements in open table list, for example placeholders used for
+      name-locking, can have alias set to 0.
+    */
+    if (table->alias)
     {
       TABLE_LIST *hash_tables;
       if ((hash_tables= (TABLE_LIST*) hash_search(&thd->handler_tables_hash,
@@ -782,5 +788,6 @@ void mysql_ha_mark_tables_for_reopen(THD *thd, TABLE *table)
         table->file->ha_index_or_rnd_end();
       }
     }
+  }
   DBUG_VOID_RETURN;
 }

sql/sql_parse.cc

@@ -3014,7 +3014,13 @@ mysql_execute_command(THD *thd)
       select_lex->options|= SELECT_NO_UNLOCK;
       unit->set_limit(select_lex);
 
-      if (!(res= open_and_lock_tables(thd, select_tables)))
+      if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE))
+      {
+        lex->link_first_table_back(create_table, link_to_local);
+        create_table->create= TRUE;
+      }
+
+      if (!(res= open_and_lock_tables(thd, lex->query_tables)))
       {
         /*
           Is table which we are changing used somewhere in other parts
@@ -3023,6 +3029,7 @@ mysql_execute_command(THD *thd)
         if (!(create_info.options & HA_LEX_CREATE_TMP_TABLE))
         {
           TABLE_LIST *duplicate;
+          create_table= lex->unlink_first_table(&link_to_local);
           if ((duplicate= unique_table(thd, create_table, select_tables, 0)))
           {
             update_non_unique_table_error(create_table, "CREATE", duplicate);
@@ -3066,6 +3073,9 @@ mysql_execute_command(THD *thd)
           delete sel_result;
         }
       }
+      else if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE))
+        create_table= lex->unlink_first_table(&link_to_local);
+
     }
     else
     {

sql/sql_prepare.cc

@@ -1491,8 +1491,21 @@ static bool mysql_test_create_table(Prepared_statement *stmt)
 
   if (select_lex->item_list.elements)
   {
+    if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE))
+    {
+      lex->link_first_table_back(create_table, link_to_local);
+      create_table->create= TRUE;
+    }
+
+    if (open_and_lock_tables(stmt->thd, lex->query_tables))
+      DBUG_RETURN(TRUE);
+
+    if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE))
+      create_table= lex->unlink_first_table(&link_to_local);
+
     select_lex->context.resolve_in_select_list= TRUE;
-    res= select_like_stmt_test_with_open_n_lock(stmt, tables, 0, 0);
+
+    res= select_like_stmt_test(stmt, 0, 0);
   }
 
   /* put tables back for PS rexecuting */

sql/sql_table.cc

@@ -62,7 +62,7 @@ static void set_tmp_file_path(char *buf, size_t bufsize, THD *thd);
     #                   Size of path
  */
 
-static uint build_table_path(char *buff, size_t bufflen, const char *db,
+uint build_table_path(char *buff, size_t bufflen, const char *db,
                       const char *table, const char *ext)
 {
   strxnmov(buff, bufflen-1, mysql_data_home, "/", db, "/", table, ext,
@@ -1722,7 +1722,14 @@ bool mysql_create_table(THD *thd,const char *db, const char *table_name,
   VOID(pthread_mutex_lock(&LOCK_open));
   if (!internal_tmp_table && !(create_info->options & HA_LEX_CREATE_TMP_TABLE))
   {
-    if (!access(path,F_OK))
+    /*
+      Inspecting table cache for placeholders created by concurrent
+      CREATE TABLE ... SELECT statements to avoid interfering with them
+      is 5.0-only solution. Starting from 5.1 we solve this problem by
+      obtaining name-lock on the table to be created first.
+    */
+    if (table_cache_has_open_placeholder(thd, db, table_name) ||
+        !access(path, F_OK))
     {
       if (create_info->options & HA_LEX_CREATE_IF_NOT_EXISTS)
         goto warn;
@@ -2051,7 +2058,7 @@ static int prepare_for_restore(THD* thd, TABLE_LIST* table,
     to finish the restore in the handler later on
   */
   pthread_mutex_lock(&LOCK_open);
-  if (reopen_name_locked_table(thd, table))
+  if (reopen_name_locked_table(thd, table, TRUE))
   {
     unlock_table_name(thd, table);
     pthread_mutex_unlock(&LOCK_open);
@@ -2158,7 +2165,7 @@ static int prepare_for_repair(THD* thd, TABLE_LIST *table_list,
     to finish the repair in the handler later on.
   */
   pthread_mutex_lock(&LOCK_open);
-  if (reopen_name_locked_table(thd, table_list))
+  if (reopen_name_locked_table(thd, table_list, TRUE))
   {
     unlock_table_name(thd, table_list);
     pthread_mutex_unlock(&LOCK_open);
@@ -2803,10 +2810,24 @@ bool mysql_create_like_table(THD* thd, TABLE_LIST* table,
   }
   else
   {
+    bool exists;
     strxmov(dst_path, mysql_data_home, "/", db, "/", table_name,
 	    reg_ext, NullS);
     fn_format(dst_path, dst_path, "", "", MYF(MY_UNPACK_FILENAME));
-    if (!access(dst_path, F_OK))
+
+    /*
+      Note that this critical section should actually cover most
+      of mysql_create_like_table() function. See bugs #18950 and
+      #23667 for more information.
+      Also note that starting from 5.1 we obtain name-lock on
+      target table instead of inspecting table cache for presence
+      of open placeholders (see comment in mysql_create_table()).
+    */
+    pthread_mutex_lock(&LOCK_open);
+    exists= (table_cache_has_open_placeholder(thd, db, table_name) ||
+             !access(dst_path, F_OK));
+    pthread_mutex_unlock(&LOCK_open);
+    if (exists)
       goto table_exists;
   }
 
@@ -3160,9 +3181,14 @@ bool mysql_alter_table(THD *thd,char *new_db, char *new_name,
       else
       {
 	char dir_buff[FN_REFLEN];
+        bool exists;
 	strxnmov(dir_buff, FN_REFLEN, mysql_real_data_home, new_db, NullS);
-	if (!access(fn_format(new_name_buff,new_name_buff,dir_buff,reg_ext,0),
-		    F_OK))
+        VOID(pthread_mutex_lock(&LOCK_open));
+        exists= (table_cache_has_open_placeholder(thd, new_db, new_name) ||
+                 !access(fn_format(new_name_buff, new_name_buff, dir_buff,
+                                   reg_ext, 0), F_OK));
+        VOID(pthread_mutex_unlock(&LOCK_open));
+        if (exists)
 	{
 	  /* Table will be closed in do_command() */
 	  my_error(ER_TABLE_EXISTS_ERROR, MYF(0), new_alias);
@@ -3247,8 +3273,22 @@ bool mysql_alter_table(THD *thd,char *new_db, char *new_name,
     if (!error && (new_name != table_name || new_db != db))
     {
       thd->proc_info="rename";
-      /* Then do a 'simple' rename of the table */
-      if (!access(new_name_buff,F_OK))
+      /*
+        Then do a 'simple' rename of the table. First we need to close all
+        instances of 'source' table.
+      */
+      close_cached_table(thd, table);
+      /*
+        Then, we want check once again that target table does not exist.
+        Note that we can't fully rely on results of previous check since
+        no lock was taken on target table during it. We also can't do this
+        before calling close_cached_table() as the latter temporarily
+        releases LOCK_open mutex.
+        Also note that starting from 5.1 we use approach with obtaining
+        of name-lock on target table.
+      */
+      if (table_cache_has_open_placeholder(thd, new_db, new_name) ||
+          !access(new_name_buff,F_OK))
       {
 	my_error(ER_TABLE_EXISTS_ERROR, MYF(0), new_name);
 	error= -1;
@@ -3256,7 +3296,6 @@ bool mysql_alter_table(THD *thd,char *new_db, char *new_name,
       else
       {
 	*fn_ext(new_name)=0;
-	close_cached_table(thd, table);
 	if (mysql_rename_table(old_db_type,db,table_name,new_db,new_alias))
 	  error= -1;
         else if (Table_triggers_list::change_table_name(thd, db, table_name,
@@ -3806,17 +3845,6 @@ bool mysql_alter_table(THD *thd,char *new_db, char *new_name,
 	      current_pid, thd->thread_id);
   if (lower_case_table_names)
     my_casedn_str(files_charset_info, old_name);
-  if (new_name != table_name || new_db != db)
-  {
-    if (!access(new_name_buff,F_OK))
-    {
-      error=1;
-      my_error(ER_TABLE_EXISTS_ERROR, MYF(0), new_name_buff);
-      VOID(quick_rm_table(new_db_type,new_db,tmp_name));
-      VOID(pthread_mutex_unlock(&LOCK_open));
-      goto err;
-    }
-  }
 
 #if (!defined( __WIN__) && !defined( __EMX__) && !defined( OS2))
   if (table->file->has_transactions())
@@ -3835,6 +3863,22 @@ bool mysql_alter_table(THD *thd,char *new_db, char *new_name,
     table->file->extra(HA_EXTRA_FORCE_REOPEN);	// Don't use this file anymore
 #endif
 
+  if (new_name != table_name || new_db != db)
+  {
+    /*
+      Check that there is no table with target name. See the
+      comment describing code for 'simple' ALTER TABLE ... RENAME.
+    */
+    if (table_cache_has_open_placeholder(thd, new_db, new_name) ||
+        !access(new_name_buff,F_OK))
+    {
+      error=1;
+      my_error(ER_TABLE_EXISTS_ERROR, MYF(0), new_name_buff);
+      VOID(quick_rm_table(new_db_type,new_db,tmp_name));
+      VOID(pthread_mutex_unlock(&LOCK_open));
+      goto err;
+    }
+  }
 
   error=0;
   if (!need_copy_table)

sql/sql_trigger.cc

@@ -271,7 +271,7 @@ bool mysql_create_or_drop_trigger(THD *thd, TABLE_LIST *tables, bool create)
   /* We also don't allow creation of triggers on views. */
   tables->required_type= FRMTYPE_TABLE;
 
-  if (reopen_name_locked_table(thd, tables))
+  if (reopen_name_locked_table(thd, tables, TRUE))
   {
     unlock_table_name(thd, tables);
     goto end;

sql/sql_yacc.yy

@@ -1474,9 +1474,7 @@ create:
 	  lex->sql_command= SQLCOM_CREATE_TABLE;
 	  if (!lex->select_lex.add_table_to_list(thd, $5, NULL,
 						 TL_OPTION_UPDATING,
-						 (using_update_log ?
-						  TL_READ_NO_INSERT:
-						  TL_READ)))
+						 TL_WRITE))
 	    MYSQL_YYABORT;
           lex->alter_info.reset();
 	  lex->col_list.empty();

sql/table.h

@@ -188,6 +188,8 @@ typedef struct st_table_share
 } TABLE_SHARE;
 
 
+extern ulong refresh_version;
+
 /* Information for one open table */
 
 struct st_table {
@@ -268,7 +270,24 @@ struct st_table {
   my_bool force_index;
   my_bool distinct,const_table,no_rows;
   my_bool key_read, no_keyread;
-  my_bool locked_by_flush;
+  /*
+    Placeholder for an open table which prevents other connections
+    from taking name-locks on this table. Typically used with
+    TABLE_SHARE::version member to take an exclusive name-lock on
+    this table name -- a name lock that not only prevents other
+    threads from opening the table, but also blocks other name
+    locks. This is achieved by:
+    - setting open_placeholder to 1 - this will block other name
+      locks, as wait_for_locked_table_name will be forced to wait,
+      see table_is_used for details.
+    - setting version to 0 - this will force other threads to close
+      the instance of this table and wait (this is the same approach
+      as used for usual name locks).
+    An exclusively name-locked table currently can have no handler
+    object associated with it (db_stat is always 0), but please do
+    not rely on that.
+  */
+  my_bool open_placeholder;
   my_bool locked_by_name;
   my_bool fulltext_searched;
   my_bool no_cache;
@@ -291,6 +310,13 @@ struct st_table {
 
   bool fill_item_list(List<Item> *item_list) const;
   void reset_item_list(List<Item> *item_list) const;
+  /* Is table open or should be treated as such by name-locking? */
+  inline bool is_name_opened() { return db_stat || open_placeholder; }
+  /*
+    Is this instance of the table should be reopen or represents a name-lock?
+  */
+  inline bool needs_reopen_or_name_lock()
+  { return s->version != refresh_version; }
 };
 
 enum enum_schema_table_state
@@ -648,6 +674,12 @@ typedef struct st_table_list
     used for implicit LOCK TABLES only and won't be used in real statement.
   */
   bool          prelocking_placeholder;
+  /*
+    This TABLE_LIST object corresponds to the table to be created
+    so it is possible that it does not exist (used in CREATE TABLE
+    ... SELECT implementation).
+  */
+  bool          create;
 
   enum enum_schema_table_state schema_table_state;
   void calc_md5(char *buffer);
@@ -655,7 +687,11 @@ typedef struct st_table_list
   int view_check_option(THD *thd, bool ignore_failure);
   bool setup_underlying(THD *thd);
   void cleanup_items();
-  bool placeholder() {return derived || view || schema_table || !table; }
+  bool placeholder()
+  {
+    return derived || view || schema_table || create && !table->db_stat ||
+           !table;
+  }
   void print(THD *thd, String *str);
   bool check_single_table(st_table_list **table, table_map map,
                           st_table_list *view);