5.1 version of fix for:

  Bug #23667 "CREATE TABLE LIKE is not isolated from alteration
              by other connections"
  Bug #18950 "CREATE TABLE LIKE does not obtain LOCK_open"
As well as:
  Bug #25578 "CREATE TABLE LIKE does not require any privileges
              on source table".

The first and the second bugs resulted in various errors and wrong
binary log order when one tried to execute concurrently CREATE TABLE LIKE
statement and DDL statements on source table or DML/DDL statements on its
target table.

The problem was caused by incomplete protection/table-locking against
concurrent statements implemented in mysql_create_like_table() routine.
We solve it by simply implementing such protection in proper way.
Most of actual work for 5.1 was already done by fix for bug 20662 and
preliminary patch changing locking in ALTER TABLE.

The third bug allowed user who didn't have any privileges on table create
its copy and therefore circumvent privilege check for SHOW CREATE TABLE.

This patch solves this problem by adding privilege check, which was missing.

Finally it also removes some duplicated code from mysql_create_like_table()
and thus fixes bug #26869 "TABLE_LIST::table_name_length inconsistent with
TABLE_LIST::table_name".


mysql-test/r/create-big.result:
  Added test coverage for concurrency-related issues with CREATE TABLE LIKE.
mysql-test/r/create.result:
  Adjusted error-code in the test case after refactoring code that
  implements CREATE TABLE ... LIKE.
mysql-test/r/grant2.result:
  Added test for bug#25578 "CREATE TABLE LIKE does not require any privileges
  on source table".
mysql-test/t/create-big.test:
  Added test coverage for concurrency-related issues with CREATE TABLE LIKE.
mysql-test/t/create.test:
  Adjusted error-code in the test case after refactoring code that
  implements CREATE TABLE ... LIKE.
mysql-test/t/disabled.def:
  Recent code changes ensured that CREATE TABLE LIKE statement is properly
  isolated against other statements, so synchronization.test should no
  longer fail (see fix for bug 20662 and preliminary patch for bug 23667
  changing ALTER TABLE locking).
mysql-test/t/grant2.test:
  Added test for bug#25578 "CREATE TABLE LIKE does not require any privileges
  on source table".
sql/handler.h:
  Introduced new flag for HA_CREATE_INFO::options in order to be able to
  distinguish CREATE TABLE ... LIKE from other types of CREATE TABLE.
sql/mysql_priv.h:
  mysql_create_like_table() now takes source table name not as a
  Table_ident object but as regular table list element.
sql/sql_lex.h:
  Removed LEX::like_name member. Now we use special flag in
  LEX::create_info::options for distinguishing CREATE TABLE ... LIKE
  from other types of CREATE TABLE and store name of source table as
  regular element in statement's table list.
sql/sql_parse.cc:
  CREATE TABLE ... LIKE implementation now uses statement's table list
  for storing information about the source table. We also use flag
  in LEX::create_info.options for distinguishing it from other types
  of CREATE TABLE.
  Finally CREATE TABLE ... LIKE now requires the same privileges on
  the source tables as SHOW CREATE TABLE. Moved this privilege check
  to check_show_create_table_access() function.
sql/sql_partition.cc:
  Now we use special flag in LEX::create_info::options for distinguishing
  CREATE TABLE ... LIKE from other types of CREATE TABLE and store name
  of source table as regular element in statement's table list.
sql/sql_table.cc:
  mysql_create_like_table():  
   - Commented and cleaned-up a bit code which is responsible for achieving
     isolation from concurrent statements. Most of actual work was done by
     fix for bug 20662 and preliminary patch changing locking locking in
     ALTER TABLE, so here we do minor things like relaxing locking on
     source table (we don't need lock on it, to have it open is enough) and
     adjusting code to make it more friendly against code implementing I_S.
   - Get rid of duplicated code related to source database/table name
     handling. All these operations are already done in
     st_select_lex::add_table_to_list(), so we achieve the same effect
     by including source table into the statement's table list.
sql/sql_yacc.yy:
  Now we use special flag in LEX::create_info::options for distinguishing
  CREATE TABLE ... LIKE from other types of CREATE TABLE and store name
  of source table as regular element in statement's table list.

mysql-test/r/create_select-big.result → mysql-test/r/create-big.result

@@ -162,3 +162,86 @@ t1	CREATE TABLE `t1` (
   `j` int(11) DEFAULT NULL
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1
 drop table t1, t2, t3;
+drop table if exists t1,t2;
+create table t1 (i int);
+set session debug="+d,sleep_create_like_before_check_if_exists";
+reset master;
+create table t2 like t1;;
+insert into t1 values (1);
+drop table t1;
+show create table t2;
+Table	Create Table
+t2	CREATE TABLE `t2` (
+  `i` int(11) DEFAULT NULL
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+drop table t2;
+show binlog events in 'master-bin.000001' from 106;
+Log_name	Pos	Event_type	Server_id	End_log_pos	Info
+master-bin.000001	#	Query	1	#	use `test`; insert into t1 values (1)
+master-bin.000001	#	Query	1	#	use `test`; create table t2 like t1
+master-bin.000001	#	Query	1	#	use `test`; drop table t1
+master-bin.000001	#	Query	1	#	use `test`; drop table t2
+create table t1 (i int);
+set session debug="-d,sleep_create_like_before_check_if_exists:+d,sleep_create_like_before_copy";
+create table t2 like t1;;
+create table if not exists t2 (j int);
+Warnings:
+Note	1050	Table 't2' already exists
+show create table t2;
+Table	Create Table
+t2	CREATE TABLE `t2` (
+  `i` int(11) DEFAULT NULL
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+drop table t2;
+reset master;
+create table t2 like t1;;
+drop table t1;
+drop table t2;
+show binlog events in 'master-bin.000001' from 106;
+Log_name	Pos	Event_type	Server_id	End_log_pos	Info
+master-bin.000001	#	Query	1	#	use `test`; create table t2 like t1
+master-bin.000001	#	Query	1	#	use `test`; drop table t1
+master-bin.000001	#	Query	1	#	use `test`; drop table t2
+create table t1 (i int);
+set session debug="-d,sleep_create_like_before_copy:+d,sleep_create_like_before_ha_create";
+reset master;
+create table t2 like t1;;
+insert into t2 values (1);
+drop table t2;
+create table t2 like t1;;
+drop table t2;
+create table t2 like t1;;
+drop table t1;
+drop table t2;
+show binlog events in 'master-bin.000001' from 106;
+Log_name	Pos	Event_type	Server_id	End_log_pos	Info
+master-bin.000001	#	Query	1	#	use `test`; create table t2 like t1
+master-bin.000001	#	Query	1	#	use `test`; insert into t2 values (1)
+master-bin.000001	#	Query	1	#	use `test`; drop table t2
+master-bin.000001	#	Query	1	#	use `test`; create table t2 like t1
+master-bin.000001	#	Query	1	#	use `test`; drop table t2
+master-bin.000001	#	Query	1	#	use `test`; create table t2 like t1
+master-bin.000001	#	Query	1	#	use `test`; drop table t1
+master-bin.000001	#	Query	1	#	use `test`; drop table t2
+create table t1 (i int);
+set session debug="-d,sleep_create_like_before_ha_create:+d,sleep_create_like_before_binlogging";
+reset master;
+create table t2 like t1;;
+insert into t2 values (1);
+drop table t2;
+create table t2 like t1;;
+drop table t2;
+create table t2 like t1;;
+drop table t1;
+drop table t2;
+show binlog events in 'master-bin.000001' from 106;
+Log_name	Pos	Event_type	Server_id	End_log_pos	Info
+master-bin.000001	#	Query	1	#	use `test`; create table t2 like t1
+master-bin.000001	#	Query	1	#	use `test`; insert into t2 values (1)
+master-bin.000001	#	Query	1	#	use `test`; drop table t2
+master-bin.000001	#	Query	1	#	use `test`; create table t2 like t1
+master-bin.000001	#	Query	1	#	use `test`; drop table t2
+master-bin.000001	#	Query	1	#	use `test`; create table t2 like t1
+master-bin.000001	#	Query	1	#	use `test`; drop table t1
+master-bin.000001	#	Query	1	#	use `test`; drop table t2
+set session debug="-d,sleep_create_like_before_binlogging";

mysql-test/r/create.result

@@ -371,7 +371,7 @@ ERROR 42S01: Table 't3' already exists
 create table non_existing_database.t1 like t1;
 ERROR 42000: Unknown database 'non_existing_database'
 create table t3 like non_existing_table;
-ERROR 42S02: Unknown table 'non_existing_table'
+ERROR 42S02: Table 'test.non_existing_table' doesn't exist
 create temporary table t3 like t1;
 ERROR 42S01: Table 't3' already exists
 drop table t1, t2, t3;

mysql-test/r/grant2.result

@@ -381,3 +381,26 @@ drop table t2;
 REVOKE ALL PRIVILEGES, GRANT OPTION FROM `a@`@localhost;
 drop user `a@`@localhost;
 SET GLOBAL log_bin_trust_function_creators = 0;
+drop database if exists mysqltest_1;
+drop database if exists mysqltest_2;
+drop user mysqltest_u1@localhost;
+create database mysqltest_1;
+create database mysqltest_2;
+grant all on mysqltest_1.* to mysqltest_u1@localhost;
+use mysqltest_2;
+create table t1 (i int);
+show create table mysqltest_2.t1;
+ERROR 42000: SELECT command denied to user 'mysqltest_u1'@'localhost' for table 't1'
+create table t1 like mysqltest_2.t1;
+ERROR 42000: SELECT command denied to user 'mysqltest_u1'@'localhost' for table 't1'
+grant select on mysqltest_2.t1 to mysqltest_u1@localhost;
+show create table mysqltest_2.t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `i` int(11) DEFAULT NULL
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+create table t1 like mysqltest_2.t1;
+use test;
+drop database mysqltest_1;
+drop database mysqltest_2;
+drop user mysqltest_u1@localhost;

mysql-test/t/create_select-big.test → mysql-test/t/create-big.test

-# Tests for various aspects of CREATE TABLE ... SELECT implementation
+# Tests for various concurrency-related aspects of CREATE TABLE ... SELECT
+# and CREATE TABLE like implementation.
 #
-# Note that we don't test general CREATE TABLE ... SELECT functionality here as
-# it is already covered by create.test. We are more interested in extreme cases.
+# Note that we don't test general CREATE TABLE ... SELECT/LIKE functionality
+# here as it is already covered by create.test. We are more interested in
+# extreme cases.
 #
 # This test takes rather long time so let us run it only in --big-test mode
 --source include/big_test.inc
 # We are using some debug-only features in this test
 --source include/have_debug.inc
+# Some of tests below also use binlog to check that statements are
+# executed and logged in correct order
+--source include/have_binlog_format_mixed_or_statement.inc
 
 # Create auxilliary connections
 connect (addconroot1, localhost, root,,);
@@ -20,7 +25,7 @@ drop table if exists t1,t2,t3,t4,t5;
 
 
 #
-# Tests for concurrency problems.
+# Tests for concurrency problems in CREATE TABLE ... SELECT
 #
 # We introduce delays between various stages of table creation
 # and check that other statements dealing with this table cannot
@@ -266,3 +271,122 @@ connection default;
 select * from t1;
 show create table t1;
 drop table t1, t2, t3;
+
+
+# Tests for possible concurrency issues with CREATE TABLE ... LIKE
+#
+# Bug #18950 "create table like does not obtain LOCK_open"
+# Bug #23667 "CREATE TABLE LIKE is not isolated from alteration by other
+#             connections"
+#
+# Again the idea of this test is that we introduce artificial delays on
+# various stages of table creation and check that concurrent statements
+# for tables from CREATE TABLE ... LIKE are not interfering.
+
+--disable_warnings
+drop table if exists t1,t2;
+--enable_warnings
+
+# What happens if some statements sneak in right after we have
+# opened source table ?
+create table t1 (i int);
+set session debug="+d,sleep_create_like_before_check_if_exists";
+# Reset binlog to have clear start
+reset master;
+--send create table t2 like t1;
+connection addconroot1;
+--sleep 2
+# DML on source table should be allowed to run concurrently
+insert into t1 values (1);
+# And DDL should wait
+drop table t1;
+connection default;
+--reap
+show create table t2;
+drop table t2;
+# Let us check that statements were executed/binlogged in correct order
+--replace_column 2 # 5 #
+show binlog events in 'master-bin.000001' from 106;
+
+# Now let us check the gap between check for target table
+# existance and copying of .frm file. 
+create table t1 (i int);
+set session debug="-d,sleep_create_like_before_check_if_exists:+d,sleep_create_like_before_copy";
+# It should be impossible to create target table concurrently
+--send create table t2 like t1;
+connection addconroot1;
+--sleep 2
+create table if not exists t2 (j int);
+connection default;
+--reap
+show create table t2;
+drop table t2;
+# And concurrent DDL on the source table should be still disallowed 
+reset master;
+--send create table t2 like t1;
+connection addconroot1;
+--sleep 2
+drop table t1;
+connection default;
+--reap
+drop table t2;
+--replace_column 2 # 5 #
+show binlog events in 'master-bin.000001' from 106;
+
+# And now he gap between copying of .frm file and ha_create_table() call. 
+create table t1 (i int);
+set session debug="-d,sleep_create_like_before_copy:+d,sleep_create_like_before_ha_create";
+# Both DML and DDL on target table should wait till operation completes
+reset master;
+--send create table t2 like t1;
+connection addconroot1;
+--sleep 2
+insert into t2 values (1);
+connection default;
+--reap
+drop table t2;
+--send create table t2 like t1;
+connection addconroot1;
+--sleep 2
+drop table t2;
+connection default;
+--reap
+# Concurrent DDL on the source table still waits 
+--send create table t2 like t1;
+connection addconroot1;
+--sleep 2
+drop table t1;
+connection default;
+--reap
+drop table t2;
+--replace_column 2 # 5 #
+show binlog events in 'master-bin.000001' from 106;
+
+# Finally we check the gap between ha_create_table() and binlogging
+create table t1 (i int);
+set session debug="-d,sleep_create_like_before_ha_create:+d,sleep_create_like_before_binlogging";
+reset master;
+--send create table t2 like t1;
+connection addconroot1;
+--sleep 2
+insert into t2 values (1);
+connection default;
+--reap
+drop table t2;
+--send create table t2 like t1;
+connection addconroot1;
+--sleep 2
+drop table t2;
+connection default;
+--reap
+--send create table t2 like t1;
+connection addconroot1;
+--sleep 2
+drop table t1;
+connection default;
+--reap
+drop table t2;
+--replace_column 2 # 5 #
+show binlog events in 'master-bin.000001' from 106;
+
+set session debug="-d,sleep_create_like_before_binlogging";

mysql-test/t/create.test

@@ -306,7 +306,7 @@ create table t3 like t1;
 create table t3 like mysqltest.t3;
 --error 1049
 create table non_existing_database.t1 like t1;
---error 1051
+--error ER_NO_SUCH_TABLE
 create table t3 like non_existing_table;
 --error 1050
 create temporary table t3 like t1;

mysql-test/t/disabled.def

@@ -30,7 +30,6 @@ rpl_ddl                  : BUG#26418 2007-03-01 mleich Slave out of sync after C
 rpl_ndb_innodb2ndb       : Bug #19710  Cluster replication to partition table fails on DELETE FROM statement
 rpl_ndb_myisam2ndb       : Bug #19710  Cluster replication to partition table fails on DELETE FROM statement
 rpl_row_blob_innodb      : BUG#18980 2006-04-10 kent    Test fails randomly
-synchronization          : Bug#24529  	Test 'synchronization' fails on Mac pushbuild; Also on Linux 64 bit.
 
 # the below testcase have been reworked to avoid the bug, test contains comment, keep bug open
 #ndb_binlog_ddl_multi     : BUG#18976 2006-04-10 kent    CRBR: multiple binlog, second binlog may miss schema log events

mysql-test/t/grant2.test

@@ -513,3 +513,44 @@ REVOKE ALL PRIVILEGES, GRANT OPTION FROM `a@`@localhost;
 drop user `a@`@localhost;
 
 SET GLOBAL log_bin_trust_function_creators = 0;
+
+
+#
+# Bug#25578 "CREATE TABLE LIKE does not require any privileges on source table"
+#
+--disable_warnings
+drop database if exists mysqltest_1;
+drop database if exists mysqltest_2;
+--enable_warnings
+--error 0,ER_CANNOT_USER
+drop user mysqltest_u1@localhost;
+
+create database mysqltest_1;
+create database mysqltest_2;
+grant all on mysqltest_1.* to mysqltest_u1@localhost;
+use mysqltest_2;
+create table t1 (i int);
+
+# Connect as user with all rights on mysqltest_1 but with no rights on mysqltest_2.
+connect (user1,localhost,mysqltest_u1,,mysqltest_1);
+connection user1;
+# As expected error is emitted
+--error ER_TABLEACCESS_DENIED_ERROR 
+show create table mysqltest_2.t1;
+# This should emit error as well
+--error ER_TABLEACCESS_DENIED_ERROR
+create table t1 like mysqltest_2.t1;
+
+# Now let us check that SELECT privilege on the source is enough
+connection default;
+grant select on mysqltest_2.t1 to mysqltest_u1@localhost;
+connection user1;
+show create table mysqltest_2.t1;
+create table t1 like mysqltest_2.t1;
+
+# Clean-up
+connection default;
+use test;
+drop database mysqltest_1;
+drop database mysqltest_2;
+drop user mysqltest_u1@localhost;

sql/handler.h

@@ -223,6 +223,7 @@
 
 #define HA_LEX_CREATE_TMP_TABLE	1
 #define HA_LEX_CREATE_IF_NOT_EXISTS 2
+#define HA_LEX_CREATE_TABLE_LIKE 4
 #define HA_OPTION_NO_CHECKSUM	(1L << 17)
 #define HA_OPTION_NO_DELAY_KEY_WRITE (1L << 18)
 #define HA_MAX_REC_LENGTH	65535

sql/mysql_priv.h

@@ -978,9 +978,8 @@ bool mysql_alter_table(THD *thd, char *new_db, char *new_name,
                        uint order_num, ORDER *order, bool ignore,
                        ALTER_INFO *alter_info, bool do_send_ok);
 bool mysql_recreate_table(THD *thd, TABLE_LIST *table_list, bool do_send_ok);
-bool mysql_create_like_table(THD *thd, TABLE_LIST *table,
-                             HA_CREATE_INFO *create_info,
-                             Table_ident *src_table);
+bool mysql_create_like_table(THD *thd, TABLE_LIST *table, TABLE_LIST *src_table,
+                             HA_CREATE_INFO *create_info);
 bool mysql_rename_table(handlerton *base, const char *old_db,
                         const char * old_name, const char *new_db,
                         const char * new_name, uint flags);

sql/sql_lex.h

@@ -1066,7 +1066,6 @@ typedef struct st_lex : public Query_tables_list
 
   char *length,*dec,*change;
   LEX_STRING name;
-  Table_ident *like_name;
   char *help_arg;
   char *backup_dir;				/* For RESTORE/BACKUP */
   char* to_log;                                 /* For PURGE MASTER LOGS TO */

sql/sql_parse.cc

@@ -39,6 +39,7 @@
    "FUNCTION" : "PROCEDURE")
 
 static bool execute_sqlcom_select(THD *thd, TABLE_LIST *all_tables);
+static bool check_show_create_table_access(THD *thd, TABLE_LIST *table);
 
 const char *any_db="*any*";	// Special symbol for check_access
 
@@ -2240,9 +2241,9 @@ mysql_execute_command(THD *thd)
       if (lex->create_info.options & HA_LEX_CREATE_TMP_TABLE)
         thd->options|= OPTION_KEEP_LOG;
       /* regular create */
-      if (lex->like_name)
-        res= mysql_create_like_table(thd, create_table, &lex->create_info, 
-                                     lex->like_name); 
+      if (lex->create_info.options & HA_LEX_CREATE_TABLE_LIKE)
+        res= mysql_create_like_table(thd, create_table, select_tables,
+                                     &lex->create_info);
       else
       {
         res= mysql_create_table(thd, create_table->db,
@@ -2432,12 +2433,7 @@ mysql_execute_command(THD *thd)
       /* Ignore temporary tables if this is "SHOW CREATE VIEW" */
       if (lex->only_view)
         first_table->skip_temporary= 1;
-
-      if (check_access(thd, SELECT_ACL | EXTRA_ACL, first_table->db,
-		       &first_table->grant.privilege, 0, 0, 
-                       test(first_table->schema_table)))
-	goto error;
-      if (grant_option && check_grant(thd, SELECT_ACL, all_tables, 2, UINT_MAX, 0))
+      if (check_show_create_table_access(thd, first_table))
 	goto error;
       res= mysqld_show_create(thd, first_table);
       break;
@@ -6854,6 +6850,25 @@ bool insert_precheck(THD *thd, TABLE_LIST *tables)
 }
 
 
+/**
+    @brief  Check privileges for SHOW CREATE TABLE statement.
+
+    @param  thd    Thread context
+    @param  table  Target table
+
+    @retval TRUE  Failure
+    @retval FALSE Success
+*/
+
+static bool check_show_create_table_access(THD *thd, TABLE_LIST *table)
+{
+  return check_access(thd, SELECT_ACL | EXTRA_ACL, table->db,
+                      &table->grant.privilege, 0, 0,
+                      test(table->schema_table)) ||
+         grant_option && check_grant(thd, SELECT_ACL, table, 2, UINT_MAX, 0);
+}
+
+
 /*
   CREATE TABLE query pre-check
 
@@ -6919,6 +6934,11 @@ bool create_table_precheck(THD *thd, TABLE_LIST *tables,
     if (tables && check_table_access(thd, SELECT_ACL, tables,0))
       goto err;
   }
+  else if (lex->create_info.options & HA_LEX_CREATE_TABLE_LIKE)
+  {
+    if (check_show_create_table_access(thd, tables))
+      goto err;
+  }
   error= FALSE;
 
 err:

sql/sql_partition.cc

@@ -3776,20 +3776,15 @@ bool mysql_unpack_partition(THD *thd,
              ha_legacy_type(default_db_type)));
   if (is_create_table_ind && old_lex->sql_command == SQLCOM_CREATE_TABLE)
   {
-    if (old_lex->like_name)
+    if (old_lex->create_info.options & HA_LEX_CREATE_TABLE_LIKE)
     {
       /*
-        This code is executed when we do a CREATE TABLE t1 LIKE t2
-        old_lex->like_name contains the t2 and the table we are opening has 
-        name t1.
+        This code is executed when we create table in CREATE TABLE t1 LIKE t2.
+        old_lex->query_tables contains table list element for t2 and the table
+        we are opening has name t1.
       */
-      Table_ident *table_ident= old_lex->like_name;
-      char *src_db= table_ident->db.str ? table_ident->db.str : thd->db;
-      char *src_table= table_ident->table.str;
-      char buf[FN_REFLEN];
-      build_table_filename(buf, sizeof(buf), src_db, src_table, "", 0);
-      if (partition_default_handling(table, part_info,
-                                     FALSE, buf))
+      if (partition_default_handling(table, part_info, FALSE,
+                                     old_lex->query_tables->table->s->path.str))
       {
         result= TRUE;
         goto end;

sql/sql_table.cc

@@ -4665,114 +4665,51 @@ bool mysql_preload_keys(THD* thd, TABLE_LIST* tables)
   SYNOPSIS
     mysql_create_like_table()
     thd		Thread object
-    table	Table list (one table only)
+    table       Table list element for target table
+    src_table   Table list element for source table
     create_info Create info
-    table_ident Src table_ident
 
   RETURN VALUES
     FALSE OK
     TRUE  error
 */
 
-bool mysql_create_like_table(THD* thd, TABLE_LIST* table,
-                             HA_CREATE_INFO *lex_create_info,
-                             Table_ident *table_ident)
+bool mysql_create_like_table(THD* thd, TABLE_LIST* table, TABLE_LIST* src_table,
+                             HA_CREATE_INFO *lex_create_info)
 {
-  TABLE *tmp_table, *name_lock= 0;
+  TABLE *name_lock= 0;
   char src_path[FN_REFLEN], dst_path[FN_REFLEN];
-  char src_table_name_buff[FN_REFLEN], src_db_name_buff[FN_REFLEN];
   uint dst_path_length;
   char *db= table->db;
   char *table_name= table->table_name;
-  char *src_db;
-  char *src_table= table_ident->table.str;
   int  err;
   bool res= TRUE;
-  enum legacy_db_type not_used;
+  uint not_used;
   HA_CREATE_INFO *create_info;
 #ifdef WITH_PARTITION_STORAGE_ENGINE
   char tmp_path[FN_REFLEN];
 #endif
   char ts_name[FN_LEN];
-  TABLE_LIST src_tables_list;
   DBUG_ENTER("mysql_create_like_table");
 
   if (!(create_info= copy_create_info(lex_create_info)))
   {
     DBUG_RETURN(TRUE);
   }
-  DBUG_ASSERT(table_ident->db.str); /* Must be set in the parser */
-  src_db= table_ident->db.str;
+
+  /* CREATE TABLE ... LIKE is not allowed for views. */
+  src_table->required_type= FRMTYPE_TABLE;
 
   /*
-    Validate the source table
+    By opening source table we guarantee that it exists and no concurrent
+    DDL operation will mess with it. Later we also take an exclusive
+    name-lock on target table name, which makes copying of .frm file,
+    call to ha_create_table() and binlogging atomic against concurrent DML
+    and DDL operations on target table. Thus by holding both these "locks"
+    we ensure that our statement is properly isolated from all concurrent
+    operations which matter.
   */
-  if (check_string_char_length(&table_ident->table, "", NAME_CHAR_LEN,
-                               system_charset_info, 1) ||
-      (table_ident->table.length &&
-       check_table_name(src_table,table_ident->table.length)))
-  {
-    my_error(ER_WRONG_TABLE_NAME, MYF(0), src_table);
-    DBUG_RETURN(TRUE);
-  }
-  if (!src_db || check_db_name(&table_ident->db))
-  {
-    my_error(ER_WRONG_DB_NAME, MYF(0), src_db ? src_db : "NULL");
-    DBUG_RETURN(-1);
-  }
-
-  if ((tmp_table= find_temporary_table(thd, src_db, src_table)))
-    strxmov(src_path, tmp_table->s->path.str, reg_ext, NullS);
-  else
-  {
-    build_table_filename(src_path, sizeof(src_path),
-                         src_db, src_table, reg_ext, 0);
-    /* Resolve symlinks (for windows) */
-    unpack_filename(src_path, src_path);
-    if (lower_case_table_names)
-      my_casedn_str(files_charset_info, src_path);
-    if (access(src_path, F_OK))
-    {
-      my_error(ER_BAD_TABLE_ERROR, MYF(0), src_table);
-      goto err;
-    }
-  }
-
-  /* 
-     create like should be not allowed for Views, Triggers, ... 
-  */
-  if (mysql_frm_type(thd, src_path, &not_used) != FRMTYPE_TABLE)
-  {
-    my_error(ER_WRONG_OBJECT, MYF(0), src_db, src_table, "BASE TABLE");
-    goto err;
-  }
-
-  if (lower_case_table_names)
-  {
-    if (src_db)
-    {
-      strmake(src_db_name_buff, src_db,
-              min(sizeof(src_db_name_buff) - 1, table_ident->db.length));
-      my_casedn_str(files_charset_info, src_db_name_buff);
-      src_db= src_db_name_buff;
-    }
-    if (src_table)
-    {
-      strmake(src_table_name_buff, src_table,
-              min(sizeof(src_table_name_buff) - 1, table_ident->table.length));
-      my_casedn_str(files_charset_info, src_table_name_buff);
-      src_table= src_table_name_buff;
-    }
-  }
-
-  bzero((gptr)&src_tables_list, sizeof(src_tables_list));
-  src_tables_list.db= src_db;
-  src_tables_list.db_length= table_ident->db.length;
-  src_tables_list.lock_type= TL_READ;
-  src_tables_list.table_name= src_table;
-  src_tables_list.alias= src_table;
-
-  if (simple_open_n_lock_tables(thd, &src_tables_list))
+  if (open_tables(thd, &src_table, &not_used, 0))
     DBUG_RETURN(TRUE);
 
   /*
@@ -4781,17 +4718,19 @@ bool mysql_create_like_table(THD* thd, TABLE_LIST* table,
     Add something to get possible tablespace info from src table,
     it can get valid tablespace name only for disk-base ndb table
   */
-  if ((src_tables_list.table->file->get_tablespace_name(thd, ts_name, FN_LEN)))
+  if ((src_table->table->file->get_tablespace_name(thd, ts_name, FN_LEN)))
   {
     create_info->tablespace= ts_name;
     create_info->storage_media= HA_SM_DISK;
   }
 
-  /*
-    Validate the destination table
+  strxmov(src_path, src_table->table->s->path.str, reg_ext, NullS);
 
-    skip the destination table name checking as this is already
-    validated.
+  DBUG_EXECUTE_IF("sleep_create_like_before_check_if_exists", my_sleep(6000000););
+
+  /*
+    Check that destination tables does not exist. Note that its name
+    was already checked when it was added to the table list.
   */
   if (create_info->options & HA_LEX_CREATE_TMP_TABLE)
   {
@@ -4812,15 +4751,29 @@ bool mysql_create_like_table(THD* thd, TABLE_LIST* table,
       goto table_exists;
   }
 
+  DBUG_EXECUTE_IF("sleep_create_like_before_copy", my_sleep(6000000););
+
   /*
     Create a new table by copying from source table
+
+    Altough exclusive name-lock on target table protects us from concurrent
+    DML and DDL operations on it we still want to wrap .FRM creation and call
+    to ha_create_table() in critical section protected by LOCK_open in order
+    to provide minimal atomicity against operations which disregard name-locks,
+    like I_S implementation, for example. This is a temporary and should not
+    be copied. Instead we should fix our code to always honor name-locks.
+
+    Also some engines (e.g. NDB cluster) require that LOCK_open should be held
+    during the call to ha_create_table(). See bug #28614 for more info.
   */
+  VOID(pthread_mutex_lock(&LOCK_open));
   if (my_copy(src_path, dst_path, MYF(MY_DONT_OVERWRITE_FILE)))
   {
     if (my_errno == ENOENT)
       my_error(ER_BAD_DB_ERROR,MYF(0),db);
     else
       my_error(ER_CANT_CREATE_FILE,MYF(0),dst_path,my_errno);
+    VOID(pthread_mutex_unlock(&LOCK_open));
     goto err;
   }
 
@@ -4842,10 +4795,12 @@ bool mysql_create_like_table(THD* thd, TABLE_LIST* table,
   strmov(src_path, tmp_path);
   my_copy(src_path, dst_path, MYF(MY_DONT_OVERWRITE_FILE));
 #endif
+
+  DBUG_EXECUTE_IF("sleep_create_like_before_ha_create", my_sleep(6000000););
+
   dst_path[dst_path_length - reg_ext_length]= '\0';  // Remove .frm
-  pthread_mutex_lock(&LOCK_open);  
   err= ha_create_table(thd, dst_path, db, table_name, create_info, 1);
-  pthread_mutex_unlock(&LOCK_open);
+  VOID(pthread_mutex_unlock(&LOCK_open));
   if (create_info->options & HA_LEX_CREATE_TMP_TABLE)
   {
     if (err || !open_temporary_table(thd, dst_path, db, table_name, 1))
@@ -4862,6 +4817,8 @@ bool mysql_create_like_table(THD* thd, TABLE_LIST* table,
     goto err;	    /* purecov: inspected */
   }
 
+  DBUG_EXECUTE_IF("sleep_create_like_before_binlogging", my_sleep(6000000););
+
   /*
     We have to write the query before we unlock the tables.
   */
@@ -4881,14 +4838,10 @@ bool mysql_create_like_table(THD* thd, TABLE_LIST* table,
            3    temporary    normal Nothing
            4    temporary temporary Nothing
            ==== ========= ========= ==============================
-
-       The variable 'tmp_table' below is used to see if the source
-       table is a temporary table: if it is set, then the source table
-       was a temporary table and we can take apropriate actions.
     */
     if (!(create_info->options & HA_LEX_CREATE_TMP_TABLE))
     {
-      if (tmp_table)                            // Case 2
+      if (src_table->table->s->tmp_table)               // Case 2
       {
         char buf[2048];
         String query(buf, sizeof(buf), system_charset_info);

sql/sql_yacc.yy

@@ -1579,7 +1579,6 @@ create:
 	  lex->create_info.default_table_charset= NULL;
 	  lex->name.str= 0;
           lex->name.length= 0;
-         lex->like_name= 0;
 	}
 	create2
 	{
@@ -3603,27 +3602,15 @@ create2:
           create3 {}
         | LIKE table_ident
           {
-            THD *thd= YYTHD;
-            LEX *lex= thd->lex;
-            if (!(lex->like_name= $2))
+            Lex->create_info.options|= HA_LEX_CREATE_TABLE_LIKE;
+            if (!Lex->select_lex.add_table_to_list(YYTHD, $2, NULL, 0, TL_READ))
               MYSQL_YYABORT;
-            if ($2->db.str == NULL &&
-                thd->copy_db_to(&($2->db.str), &($2->db.length)))
-            {
-              MYSQL_YYABORT;
-            }
           }
         | '(' LIKE table_ident ')'
           {
-            THD *thd= YYTHD;
-            LEX *lex= thd->lex;
-            if (!(lex->like_name= $3))
+            Lex->create_info.options|= HA_LEX_CREATE_TABLE_LIKE;
+            if (!Lex->select_lex.add_table_to_list(YYTHD, $3, NULL, 0, TL_READ))
               MYSQL_YYABORT;
-            if ($3->db.str == NULL &&
-                thd->copy_db_to(&($3->db.str), &($3->db.length)))
-            {
-              MYSQL_YYABORT;
-            }
           }
         ;
 
@@ -5112,7 +5099,6 @@ alter:
 	  lex->key_list.empty();
 	  lex->col_list.empty();
           lex->select_lex.init_order();
-	  lex->like_name= 0;
 	  lex->select_lex.db=
             ((TABLE_LIST*) lex->select_lex.table_list.first)->db;
 	  bzero((char*) &lex->create_info,sizeof(lex->create_info));