(manual port from 4.0 - was needed)

Fix for BUG#4971 "CREATE TABLE ... TYPE=HEAP SELECT ... stops slave (wrong DELETE in binlog)":
replacing the no_log argument of mysql_create_table() by some safer method
(temporarily setting OPTION_BIN_LOG to 0) which guarantees that even the automatic
DELETE FROM heap_table does not get into the binlog when a not-yet-existing HEAP table
is opened by mysql_create_table().


mysql-test/r/rpl_heap.result:
  result update
mysql-test/t/rpl_heap.test:
  changing test to test a bug (but anyway, mysql-test-run --manager looks like not working in 4.1 currently,
  so this test is never run).
sql/log.cc:
  new class Disable_binlog used to temporarily disable binlogging for one thread.
sql/mysql_priv.h:
  removing argument no_log from mysql_create_table(); no_log was not perfect as some
  binlogging could still be done by open_unireg_entry() for a HEAP table.
sql/sql_class.h:
  new class Disable_binlog used to temporarily disable binlogging for one thread.
sql/sql_parse.cc:
  removing no_log arg from mysql_create_table()
sql/sql_table.cc:
  removing no_log from mysql_create_table(); instead using new class Disable_binlog.
  Disabling binlogging in some cases, where the binlogging is done later by some other code
  (case of CREATE SELECT and ALTER).

mysql-test/r/rpl_heap.result

 reset master;
 drop table if exists t1;
-create table t1 (a int) type=HEAP;
-insert into t1 values(10);
+create table t1 type=HEAP select 10 as a;
+insert into t1 values(11);
 show binlog events from 79;
 Log_name	Pos	Event_type	Server_id	Orig_log_pos	Info
-master-bin.001	79	Query	1	79	use `test`; create table t1 (a int) type=HEAP
-master-bin.001	147	Query	1	147	use `test`; DELETE FROM `test`.`t1`
-master-bin.001	205	Query	1	205	use `test`; insert into t1 values(10)
+master-bin.001	79	Query	1	79	use `test`; create table t1 type=HEAP select 10 as a
+master-bin.001	154	Query	1	154	use `test`; insert into t1 values(11)
 reset slave;
 start slave;
 show create table t1;
 Table	Create Table
 t1	CREATE TABLE `t1` (
-  `a` int(11) default NULL
+  `a` bigint(2) NOT NULL default '0'
 ) TYPE=HEAP
 select * from t1;
 a
 10
+11
 select * from t1;
 a
 select * from t1 limit 10;

mysql-test/t/rpl_heap.test

@@ -13,8 +13,10 @@ connect (slave,localhost,root,,test,0,slave.sock);
 connection master;
 reset master;
 drop table if exists t1;
-create table t1 (a int) type=HEAP;
-insert into t1 values(10);
+# we use CREATE SELECT to verify that DELETE does not get into binlog
+# before CREATE SELECT
+create table t1 type=HEAP select 10 as a;
+insert into t1 values(11);
 save_master_pos;
 show binlog events from 79;
 connection slave;

sql/log.cc

@@ -1877,6 +1877,20 @@ void MYSQL_LOG::set_max_size(ulong max_size_arg)
 }
 
 
+Disable_binlog::Disable_binlog(THD *thd_arg) : 
+  thd(thd_arg),
+  save_options(thd_arg->options)
+{
+  thd_arg->options&= ~OPTION_BIN_LOG;
+};
+
+
+Disable_binlog::~Disable_binlog()
+{
+  thd->options= save_options;
+}
+
+
 /*
   Check if a string is a valid number
 

sql/mysql_priv.h

@@ -518,7 +518,7 @@ int mysql_prepare_table(THD *thd, HA_CREATE_INFO *create_info,
 int mysql_create_table(THD *thd,const char *db, const char *table_name,
 		       HA_CREATE_INFO *create_info,
 		       List<create_field> &fields, List<Key> &keys,
-		       bool tmp_table, bool no_log, uint select_field_count);
+		       bool tmp_table, uint select_field_count);
 TABLE *create_table_from_items(THD *thd, HA_CREATE_INFO *create_info,
 			       const char *db, const char *name,
 			       List<create_field> *extra_fields,

sql/sql_class.h

@@ -1017,6 +1017,27 @@ class THD :public ilink,
 #define SYSTEM_THREAD_SLAVE_IO 2
 #define SYSTEM_THREAD_SLAVE_SQL 4
 
+/*
+  Disables binary logging for one thread, and resets it back to what it was
+  before being disabled. 
+  Some functions (like the internal mysql_create_table() when it's called by
+  mysql_alter_table()) must NOT write to the binlog (binlogging is done at the
+  at a later stage of the command already, and must be, for locking reasons);
+  so we internally disable it temporarily by creating the Disable_binlog
+  object and reset the state by destroying the object (don't forget that! or
+  write code so that the object gets automatically destroyed when leaving a
+  function...).
+*/
+class Disable_binlog {
+private:
+  THD *thd;
+  ulong save_options;
+  ulong save_master_access;
+public:
+  Disable_binlog(THD *thd_arg);
+  ~Disable_binlog();
+};
+
 /*
   Used to hold information about file and file structure in exchainge 
   via non-DB file (...INTO OUTFILE..., ...LOAD DATA...)

sql/sql_parse.cc

@@ -2379,7 +2379,7 @@ mysql_execute_command(THD *thd)
         res= mysql_create_table(thd,create_table->db,
 			         create_table->real_name, &lex->create_info,
 			         lex->create_list,
-			         lex->key_list,0,0,0); // do logging
+			         lex->key_list,0,0);
       }
       if (!res)
 	send_ok(thd);

sql/sql_table.cc

@@ -1090,7 +1090,6 @@ int mysql_prepare_table(THD *thd, HA_CREATE_INFO *create_info,
     keys		List of keys to create
     tmp_table		Set to 1 if this is an internal temporary table
 			(From ALTER TABLE)
-    no_log		Don't log the query to binary log.
 
   DESCRIPTION
     If one creates a temporary table, this is automaticly opened
@@ -1108,7 +1107,7 @@ int mysql_prepare_table(THD *thd, HA_CREATE_INFO *create_info,
 int mysql_create_table(THD *thd,const char *db, const char *table_name,
 		       HA_CREATE_INFO *create_info,
 		       List<create_field> &fields,
-		       List<Key> &keys,bool tmp_table,bool no_log,
+		       List<Key> &keys,bool tmp_table,
 		       uint select_field_count)
 {
   char		path[FN_REFLEN];
@@ -1277,7 +1276,7 @@ int mysql_create_table(THD *thd,const char *db, const char *table_name,
     }
     thd->tmp_table_used= 1;
   }
-  if (!tmp_table && !no_log)
+  if (!tmp_table)
   {
     // Must be written before unlock
     mysql_update_log.write(thd,thd->query, thd->query_length);
@@ -1352,6 +1351,7 @@ TABLE *create_table_from_items(THD *thd, HA_CREATE_INFO *create_info,
   TABLE *table;
   tmp_table.table_name=0;
   uint select_field_count= items->elements;
+  Disable_binlog disable_binlog(thd);
   DBUG_ENTER("create_table_from_items");
 
   /* Add selected items to field list */
@@ -1382,9 +1382,17 @@ TABLE *create_table_from_items(THD *thd, HA_CREATE_INFO *create_info,
   }
   /* create and lock table */
   /* QQ: This should be done atomic ! */
+  /* We don't log the statement, it will be logged later */
   if (mysql_create_table(thd,db,name,create_info,*extra_fields,
-			 *keys,0,1,select_field_count)) // no logging
+			 *keys,0,select_field_count))
     DBUG_RETURN(0);
+  /*
+    If this is a HEAP table, the automatic DELETE FROM which is written to the
+    binlog when a HEAP table is opened for the first time since startup, must
+    not be written: 1) it would be wrong (imagine we're in CREATE SELECT: we
+    don't want to delete from it) 2) it would be written before the CREATE
+    TABLE, which is a wrong order. So we keep binary logging disabled.
+  */
   if (!(table=open_table(thd,db,name,name,(bool*) 0)))
   {
     quick_rm_table(create_info->db_type,db,table_case_name(create_info,name));
@@ -1401,6 +1409,7 @@ TABLE *create_table_from_items(THD *thd, HA_CREATE_INFO *create_info,
   }
   table->file->extra(HA_EXTRA_WRITE_CACHE);
   DBUG_RETURN(table);
+  /* Note that leaving the function resets binlogging properties */
 }
 
 
@@ -3008,12 +3017,14 @@ int mysql_alter_table(THD *thd,char *new_db, char *new_name,
   }
   else
     create_info->data_file_name=create_info->index_file_name=0;
-
-  if ((error=mysql_create_table(thd, new_db, tmp_name,
-				create_info,
-				create_list,key_list,1,1,0))) // no logging
-    DBUG_RETURN(error);
-
+  {
+    /* We don't log the statement, it will be logged later */
+    Disable_binlog disable_binlog(thd);
+    if ((error=mysql_create_table(thd, new_db, tmp_name,
+                                  create_info,
+                                  create_list,key_list,1,0)))
+      DBUG_RETURN(error);
+  }
   if (table->tmp_table)
     new_table=open_table(thd,new_db,tmp_name,tmp_name,0);
   else