Remove warnings and portability fixes

New global read lock code
Fixed bug in DATETIME with WHERE optimization
Made UNION code more general.

include/global.h

@@ -781,9 +781,9 @@ typedef union {
 				  *((uchar*) (T))=  (uchar)(def_temp); \
 				  *((uchar*) (T+1))=(uchar)((def_temp >> 8)); }
 #define int3store(T,A)		{ /*lint -save -e734 */\
-				  *((T))=(char) ((A));\
-				  *((T)+1)=(char) (((A) >> 8));\
-				  *((T)+2)=(char) (((A) >> 16)); \
+				  *((uchar*)(T))=(uchar) ((A));\
+				  *((uchar*) (T)+1)=(uchar) (((A) >> 8));\
+				  *((uchar*)(T)+2)=(uchar) (((A) >> 16)); \
 				  /*lint -restore */}
 #define int4store(T,A)		{ *(T)=(char) ((A));\
 				  *((T)+1)=(char) (((A) >> 8));\

include/mysql_com.h

@@ -146,15 +146,15 @@ enum enum_field_types { FIELD_TYPE_DECIMAL, FIELD_TYPE_TINY,
 #define FIELD_TYPE_CHAR FIELD_TYPE_TINY		/* For compability */
 #define FIELD_TYPE_INTERVAL FIELD_TYPE_ENUM	/* For compability */
 
-extern unsigned long max_allowed_packet;
-extern unsigned long net_buffer_length;
-
 #define net_new_transaction(net) ((net)->pkt_nr=0)
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
+extern unsigned long max_allowed_packet;
+extern unsigned long net_buffer_length;
+
 int	my_net_init(NET *net, Vio* vio);
 void	net_end(NET *net);
 void	net_clear(NET *net);

include/mysqld_error.h

@@ -217,4 +217,5 @@
 #define ER_ERROR_WHEN_EXECUTING_COMMAND 1214
 #define ER_WRONG_USAGE 1215
 #define ER_WRONG_NUMBER_OF_COLUMNS_IN_SELECT 1216
-#define ER_ERROR_MESSAGES 217
+#define ER_CANT_UPDATE_WITH_READLOCK 1217
+#define ER_ERROR_MESSAGES 218

myisam/mi_write.c

@@ -35,7 +35,10 @@ static int _mi_balance_page(MI_INFO *info,MI_KEYDEF *keyinfo,uchar *key,
 static uchar *_mi_find_last_pos(MI_KEYDEF *keyinfo, uchar *page,
 				uchar *key, uint *return_key_length,
 				uchar **after_key);
-
+int _mi_ck_write_tree(register MI_INFO *info, uint keynr, uchar *key,
+		      uint key_length);
+int _mi_ck_write_btree(register MI_INFO *info, uint keynr, uchar *key,
+		       uint key_length);
 
 	/* Write new record to database */
 
@@ -214,7 +217,7 @@ int _mi_ck_write(MI_INFO *info, uint keynr, uchar *key, uint key_length)
  **********************************************************************/
 
 int _mi_ck_write_btree(register MI_INFO *info, uint keynr, uchar *key,
-		 uint key_length)
+		       uint key_length)
 {
   int error;
   DBUG_ENTER("_mi_ck_write_btree");
@@ -710,7 +713,7 @@ typedef struct {
 } bulk_insert_param;
 
 int _mi_ck_write_tree(register MI_INFO *info, uint keynr, uchar *key,
-		 uint key_length)
+		      uint key_length)
 {
   int error;
   DBUG_ENTER("_mi_ck_write_tree");

mysql-test/r/select.result

@@ -1210,7 +1210,7 @@ fld1	fld1
 companynr	companyname
 table	type	possible_keys	key	key_len	ref	rows	Extra
 t2	ALL	NULL	NULL	NULL	NULL	1199	
-t4	eq_ref	PRIMARY	PRIMARY	1	t2.companynr	1	where used; Not exists
+t4	eq_ref	PRIMARY	PRIMARY	1	test.t2.companynr	1	where used; Not exists
 table	type	possible_keys	key	key_len	ref	rows	Extra
 t4	ALL	NULL	NULL	NULL	NULL	12	
 t2	ALL	NULL	NULL	NULL	NULL	1199	where used; Not exists

mysql-test/r/type_datetime.result

@@ -33,3 +33,5 @@ date_format(a,"%Y-%m-%d")=b	right(a,6)=c+0	a=d+0
 1	1	1
 a
 0000-00-00 00:00:00
+id	dt
+1	2001-08-14 00:00:00

mysql-test/r/union.result

@@ -56,5 +56,3 @@ t2	c	1
 t2	d	1
 t2	e	1
 t2	f	1
-table	type	possible_keys	key	key_len	ref	rows	Extra
-t2	ALL	NULL	NULL	NULL	NULL	4	

mysql-test/t/type_datetime.test

@@ -30,3 +30,12 @@ CREATE TABLE t1 (a datetime not null);
 insert into t1 values (0);
 select * from t1 where a is null;
 drop table t1;
+
+#
+# Test with bug when propagating DATETIME to integer and WHERE optimization
+#
+
+create table t1 (id int, dt datetime);
+insert into t1 values (1,"2001-08-14 00:00:00"),(2,"2001-08-15 00:00:00"),(3,"2001-08-16 00:00:00");
+select * from t1 where dt='2001-08-14 00:00:00' and dt =  if(id=1,'2001-08-14 00:00:00','1999-08-15');
+drop table t1;

mysql-test/t/union.test

@@ -16,17 +16,28 @@ select 0,'#' union select a,b from t1 union all select a,b from t2 union select
 select a,b from t1 union select a,b from t1;
 select 't1',b,count(*) from t1 group by b UNION select 't2',b,count(*) from t2 group by b;
 
+# Test some error conditions with UNION
+--error 1215
 explain select a,b from t1 union all select a,b from t2;
 
-# Test some error conditions with UNION
 --error 1215
 select a,b from t1 into outfile 'skr' union select a,b from t2;
 
 --error 1215
 select a,b from t1 order by a union select a,b from t2;
 
+--error 1216
+create table t3 select a,b from t1 union select a from t2;
+
+--error 1215
+insert into t3 select a from t1 order by a union select a from t2;
+
 --error 1216
 select a,b from t1 union select a from t2;
+
+# Test CREATE, INSERT and REPLACE
 create table t3 select a,b from t1 union all select a,b from t2;
 insert into t3 select a,b from t1 union all select a,b from t2;
+replace into t3 select a,b as c from t1 union all select a,b from t2;
+
 drop table t1,t2,t3;

sql/item_sum.cc

@@ -790,12 +790,12 @@ String *Item_std_field::val_str(String *str)
 
 static int simple_raw_key_cmp(void* arg, byte* key1, byte* key2)
 {
-  return memcmp(key1, key2, (int) arg);
+  return memcmp(key1, key2, *(uint*) arg);
 }
 
 static int simple_str_key_cmp(void* arg, byte* key1, byte* key2)
 {
-  return my_sortcmp(key1, key2, (int) arg);
+  return my_sortcmp(key1, key2, *(uint*) arg);
 }
 
 /*
@@ -904,7 +904,6 @@ bool Item_sum_count_distinct::setup(THD *thd)
   {
     qsort_cmp2 compare_key;
     void* cmp_arg;
-    int key_len;
 
     // to make things easier for dump_leaf if we ever have to dump to MyISAM
     restore_record(table,2);
@@ -937,7 +936,8 @@ bool Item_sum_count_distinct::setup(THD *thd)
 	compare_key = (qsort_cmp2)simple_raw_key_cmp;
 	break;
       }
-      cmp_arg = (void*)(key_len = field->pack_length());
+      key_length = field->pack_length();
+      cmp_arg = (void*) &key_length;
       rec_offset = 1;
     }
     else // too bad, cannot cheat - there is more than one field
@@ -950,38 +950,38 @@ bool Item_sum_count_distinct::setup(THD *thd)
 	    (uint32*) thd->alloc(sizeof(uint32) * table->fields)))
 	return 1;
 
-      for (key_len = 0, lengths=field_lengths; field < field_end; ++field)
+      for (key_length = 0, lengths=field_lengths; field < field_end; ++field)
       {
 	uint32 length= (*field)->pack_length();
-	key_len += length;
+	key_length += length;
 	*lengths++ = length;
 	if (!(*field)->binary())
 	  all_binary = 0;			// Can't break loop here
       }
-      rec_offset = table->reclength - key_len;
+      rec_offset = table->reclength - key_length;
       if (all_binary)
       {
 	compare_key = (qsort_cmp2)simple_raw_key_cmp;
-	cmp_arg = (void*)key_len;
+	cmp_arg = (void*) &key_length;
       }
       else
       {
 	compare_key = (qsort_cmp2) composite_key_cmp ;
-	cmp_arg = (void*)this;
+	cmp_arg = (void*) this;
       }
     }
 
     init_tree(&tree, min(max_heap_table_size, sortbuff_size/16), 0,
-	      key_len, compare_key, 0, NULL, cmp_arg);
+	      key_length, compare_key, 0, NULL, cmp_arg);
     use_tree = 1;
 
     /*
-      The only time key_len could be 0 is if someone does
+      The only time key_length could be 0 is if someone does
       count(distinct) on a char(0) field - stupid thing to do,
       but this has to be handled - otherwise someone can crash
       the server with a DoS attack
     */
-    max_elements_in_tree = ((key_len) ? max_heap_table_size/key_len :
+    max_elements_in_tree = ((key_length) ? max_heap_table_size/key_length :
 			    1);
   }
   return 0;

sql/item_sum.h

@@ -149,6 +149,7 @@ class Item_sum_count_distinct :public Item_sum_int
   uint32 *field_lengths;
   TMP_TABLE_PARAM *tmp_table_param;
   TREE tree;
+  uint key_length;
 
   // calculated based on max_heap_table_size. If reached,
   // walk the tree and dump it into MyISAM table
@@ -169,7 +170,7 @@ class Item_sum_count_distinct :public Item_sum_int
   
   friend int composite_key_cmp(void* arg, byte* key1, byte* key2);
   friend int dump_leaf(byte* key, uint32 count __attribute__((unused)),
-		Item_sum_count_distinct* item);
+		       Item_sum_count_distinct* item);
 
   public:
   Item_sum_count_distinct(List<Item> &list)

sql/lock.cc

@@ -55,35 +55,13 @@ MYSQL_LOCK *mysql_lock_tables(THD *thd,TABLE **tables,uint count)
 	Someone has issued LOCK ALL TABLES FOR READ and we want a write lock
 	Wait until the lock is gone
       */
-      if (thd->global_read_lock)	// This thread had the read locks
+      if (wait_if_global_read_lock(thd, 1))
       {
-	my_error(ER_TABLE_NOT_LOCKED_FOR_WRITE,MYF(0),
-		 write_lock_used->table_name);
 	my_free((gptr) sql_lock,MYF(0));
 	sql_lock=0;
 	break;
       }	
-
-      pthread_mutex_lock(&LOCK_open);
-      pthread_mutex_lock(&thd->mysys_var->mutex);
-      thd->mysys_var->current_mutex= &LOCK_open;
-      thd->mysys_var->current_cond= &COND_refresh;
-      thd->proc_info="Waiting for table";
-      pthread_mutex_unlock(&thd->mysys_var->mutex);
-
-      while (global_read_lock && ! thd->killed &&
-	     thd->version == refresh_version)
-      {
-	(void) pthread_cond_wait(&COND_refresh,&LOCK_open);
-      }
-      pthread_mutex_unlock(&LOCK_open);
-      pthread_mutex_lock(&thd->mysys_var->mutex);
-      thd->mysys_var->current_mutex= 0;
-      thd->mysys_var->current_cond= 0;
-      thd->proc_info= 0;
-      pthread_mutex_unlock(&thd->mysys_var->mutex);
-
-      if (thd->version != refresh_version || thd->killed)
+      if (thd->version != refresh_version)
       {
 	my_free((gptr) sql_lock,MYF(0));
 	goto retry;
@@ -502,3 +480,94 @@ static void print_lock_error(int error)
   DBUG_VOID_RETURN;
 }
 
+
+/****************************************************************************
+  Handling of global read locks
+
+  The global locks are handled through the global variables:
+  global_read_lock
+  waiting_for_read_lock 
+  protect_against_global_read_lock
+****************************************************************************/
+
+volatile uint global_read_lock=0;
+static volatile uint protect_against_global_read_lock=0;
+static volatile uint waiting_for_read_lock=0;
+
+bool lock_global_read_lock(THD *thd)
+{
+  DBUG_ENTER("lock_global_read_lock");
+
+  if (!thd->global_read_lock)
+  {
+    (void) pthread_mutex_lock(&LOCK_open);
+    const char *old_message=thd->enter_cond(&COND_refresh, &LOCK_open,
+					    "Waiting to get readlock");
+    waiting_for_read_lock++;
+    while (protect_against_global_read_lock && !thd->killed)
+      pthread_cond_wait(&COND_refresh, &LOCK_open);
+    waiting_for_read_lock--;
+    if (thd->killed)
+    {
+      (void) pthread_mutex_unlock(&LOCK_open);
+      DBUG_RETURN(1);
+    }
+    thd->global_read_lock=1;
+    global_read_lock++;
+    (void) pthread_mutex_unlock(&LOCK_open);
+  }
+  DBUG_RETURN(0);
+}
+
+void unlock_global_read_lock(THD *thd)
+{
+  uint tmp;
+  thd->global_read_lock=0;
+  pthread_mutex_lock(&LOCK_open);
+  tmp= --global_read_lock;
+  pthread_mutex_unlock(&LOCK_open);
+  /* Send the signal outside the mutex to avoid a context switch */
+  if (!tmp)
+    pthread_cond_broadcast(&COND_refresh);
+}
+
+
+bool wait_if_global_read_lock(THD *thd, bool abort_on_refresh)
+{
+  const char *old_message;
+  bool result=0;
+  DBUG_ENTER("wait_if_global_read_lock");
+
+  (void) pthread_mutex_lock(&LOCK_open);
+  if (global_read_lock)
+  {
+    if (thd->global_read_lock)		// This thread had the read locks
+    {
+      my_error(ER_CANT_UPDATE_WITH_READLOCK,MYF(0));
+      DBUG_RETURN(1);
+    }	
+    old_message=thd->enter_cond(&COND_refresh, &LOCK_open,
+				"Waiting for release of readlock");
+    while (global_read_lock && ! thd->killed &&
+	   (!abort_on_refresh || thd->version == refresh_version))
+      (void) pthread_cond_wait(&COND_refresh,&LOCK_open);
+    if (thd->killed)
+      result=1;
+    thd->exit_cond(old_message);
+  }
+  if (!abort_on_refresh && !result)
+    protect_against_global_read_lock++;
+  pthread_mutex_unlock(&LOCK_open);
+  DBUG_RETURN(result);
+}
+
+
+void start_waiting_global_read_lock(THD *thd)
+{
+  bool tmp;
+  (void) pthread_mutex_lock(&LOCK_open);
+  tmp= (!--protect_against_global_read_lock && waiting_for_read_lock);
+  (void) pthread_mutex_unlock(&LOCK_open);
+  if (tmp)
+    pthread_cond_broadcast(&COND_refresh);
+}

sql/log_event.cc

@@ -1054,8 +1054,7 @@ Slave_log_event::~Slave_log_event()
 
 #ifdef MYSQL_CLIENT
 
-void Slave_log_event::print(FILE* file, bool short_form = 0,
-			    char* last_db = 0)
+void Slave_log_event::print(FILE* file, bool short_form, char* last_db)
 {
   char llbuff[22];
   if(short_form)
@@ -1167,8 +1166,8 @@ Create_file_log_event::Create_file_log_event(const char* buf, int len):
   block_len = len - block_offset;
 }
 #ifdef MYSQL_CLIENT
-void Create_file_log_event::print(FILE* file, bool short_form = 0,
-				  char* last_db = 0)
+void Create_file_log_event::print(FILE* file, bool short_form,
+				  char* last_db)
 {
   if (short_form)
     return;
@@ -1224,8 +1223,8 @@ int Append_block_log_event::write_data(IO_CACHE* file)
 }
 
 #ifdef MYSQL_CLIENT  
-void Append_block_log_event::print(FILE* file, bool short_form = 0,
-				   char* last_db = 0)
+void Append_block_log_event::print(FILE* file, bool short_form,
+				   char* last_db)
 {
   if (short_form)
     return;
@@ -1273,8 +1272,8 @@ int Delete_file_log_event::write_data(IO_CACHE* file)
 }
 
 #ifdef MYSQL_CLIENT  
-void Delete_file_log_event::print(FILE* file, bool short_form = 0,
-				  char* last_db = 0)
+void Delete_file_log_event::print(FILE* file, bool short_form,
+				  char* last_db)
 {
   if (short_form)
     return;
@@ -1320,8 +1319,8 @@ int Execute_load_log_event::write_data(IO_CACHE* file)
 }
 
 #ifdef MYSQL_CLIENT  
-void Execute_load_log_event::print(FILE* file, bool short_form = 0,
-				   char* last_db = 0)
+void Execute_load_log_event::print(FILE* file, bool short_form,
+				   char* last_db)
 {
   if (short_form)
     return;
@@ -1757,7 +1756,7 @@ int Execute_load_log_event::exec_event(struct st_master_info* mi)
   // can preserve ascending order of log sequence numbers - needed
   // to handle failover 
   save_options = thd->options;
-  thd->options &= ~OPTION_BIN_LOG;
+  thd->options &= ~ (ulong) OPTION_BIN_LOG;
   lev->thd = thd;
   if (lev->exec_event(0,0))
   {

sql/mysql_priv.h

@@ -285,7 +285,6 @@ int mysql_optimize_table(THD* thd, TABLE_LIST* table_list,
 			 HA_CHECK_OPT* check_opt);
 
 /* net_pkg.c */
-void send_error(NET *net,uint sql_errno=0, const char *err=0);
 void send_warning(NET *net, uint sql_errno, const char *err=0);
 void net_printf(NET *net,uint sql_errno, ...);
 void send_ok(NET *net,ha_rows affected_rows=0L,ulonglong id=0L,
@@ -312,11 +311,12 @@ SORT_FIELD * make_unireg_sortorder(ORDER *order, uint *length);
 int setup_order(THD *thd,TABLE_LIST *tables, List<Item> &fields,
                 List <Item> &all_fields, ORDER *order);
 
+int handle_select(THD *thd, LEX *lex, select_result *result);
 int mysql_select(THD *thd,TABLE_LIST *tables,List<Item> &list,COND *conds,
                  List<Item_func_match> &ftfuncs,
 		 ORDER *order, ORDER *group,Item *having,ORDER *proc_param,
 		 ulong select_type,select_result *result);
-int mysql_union(THD *thd,LEX *lex,select_result  *create_insert=(select_result *)NULL);
+int mysql_union(THD *thd,LEX *lex,select_result *result);
 Field *create_tmp_field(TABLE *table,Item *item, Item::Type type,
 			Item_result_field ***copy_func, Field **from_field,
 			bool group,bool modify_item);
@@ -586,6 +586,10 @@ void mysql_unlock_some_tables(THD *thd, TABLE **table,uint count);
 void mysql_lock_remove(THD *thd, MYSQL_LOCK *locked,TABLE *table);
 void mysql_lock_abort(THD *thd, TABLE *table);
 MYSQL_LOCK *mysql_lock_merge(MYSQL_LOCK *a,MYSQL_LOCK *b);
+bool lock_global_read_lock(THD *thd);
+void unlock_global_read_lock(THD *thd);
+bool wait_if_global_read_lock(THD *thd, bool abort_on_refresh);
+void start_waiting_global_read_lock(THD *thd);
 
 /* Lock based on name */
 int lock_table_name(THD *thd, TABLE_LIST *table_list);

sql/mysqld.cc

@@ -262,7 +262,7 @@ bool server_id_supplied = 0;
 uint mysql_port;
 uint test_flags = 0, select_errors=0, dropping_tables=0,ha_open_options=0;
 uint volatile thread_count=0, thread_running=0, kill_cached_threads=0,
-	      wake_thread=0, global_read_lock=0;
+	      wake_thread=0;
 ulong thd_startup_options=(OPTION_UPDATE_LOG | OPTION_AUTO_IS_NULL |
 			   OPTION_BIN_LOG | OPTION_QUOTE_SHOW_CREATE );
 uint protocol_version=PROTOCOL_VERSION;

sql/opt_range.cc

@@ -2637,7 +2637,6 @@ int QUICK_SELECT_DESC::get_next()
     }
     range = 0;					// To next range
   }
-  DBUG_RETURN(HA_ERR_END_OF_FILE);
 }
 
 /*

sql/share/czech/errmsg.txt

@@ -227,3 +227,4 @@
 "Error when executing command %s: %-.128s",
 "Wrong usage of %s and %s",
 "The used SELECT statements have a different number of columns",
+"Can't execute the query because you have a conflicting read lock",

sql/share/danish/errmsg.txt

@@ -221,3 +221,4 @@
 "Error when executing command %s: %-.128s",
 "Wrong usage of %s and %s",
 "The used SELECT statements have a different number of columns",
+"Can't execute the query because you have a conflicting read lock",

sql/share/dutch/errmsg.txt

@@ -222,3 +222,4 @@
 "Error when executing command %s: %-.128s",
 "Wrong usage of %s and %s",
 "The used SELECT statements have a different number of columns",
+"Can't execute the query because you have a conflicting read lock",

sql/share/english/errmsg.txt

@@ -218,3 +218,4 @@
 "Error when executing command %s: %-.128s",
 "Wrong usage of %s and %s",
 "The used SELECT statements have a different number of columns",
+"Can't execute the query because you have a conflicting read lock",

sql/share/estonian/errmsg.txt

@@ -222,3 +222,4 @@
 "Error when executing command %s: %-.128s",
 "Wrong usage of %s and %s",
 "The used SELECT statements have a different number of columns",
+"Can't execute the query because you have a conflicting read lock",

sql/share/french/errmsg.txt

@@ -218,3 +218,4 @@
 "Error when executing command %s: %-.128s",
 "Wrong usage of %s and %s",
 "The used SELECT statements have a different number of columns",
+"Can't execute the query because you have a conflicting read lock",

sql/share/german/errmsg.txt

@@ -221,3 +221,4 @@
 "Error when executing command %s: %-.128s",
 "Wrong usage of %s and %s",
 "The used SELECT statements have a different number of columns",
+"Can't execute the query because you have a conflicting read lock",

sql/share/greek/errmsg.txt

@@ -218,3 +218,4 @@
 "Error when executing command %s: %-.128s",
 "Wrong usage of %s and %s",
 "The used SELECT statements have a different number of columns",
+"Can't execute the query because you have a conflicting read lock",

sql/share/hungarian/errmsg.txt

@@ -220,3 +220,4 @@
 "Error when executing command %s: %-.128s",
 "Wrong usage of %s and %s",
 "The used SELECT statements have a different number of columns",
+"Can't execute the query because you have a conflicting read lock",

sql/share/italian/errmsg.txt

@@ -218,3 +218,4 @@
 "Error when executing command %s: %-.128s",
 "Wrong usage of %s and %s",
 "The used SELECT statements have a different number of columns",
+"Can't execute the query because you have a conflicting read lock",

sql/share/japanese/errmsg.txt

@@ -220,3 +220,4 @@
 "Error when executing command %s: %-.128s",
 "Wrong usage of %s and %s",
 "The used SELECT statements have a different number of columns",
+"Can't execute the query because you have a conflicting read lock",

sql/share/korean/errmsg.txt

@@ -218,3 +218,4 @@
 "Error when executing command %s: %-.128s",
 "Wrong usage of %s and %s",
 "The used SELECT statements have a different number of columns",
+"Can't execute the query because you have a conflicting read lock",

sql/share/norwegian-ny/errmsg.txt

@@ -220,3 +220,4 @@
 "Error when executing command %s: %-.128s",
 "Wrong usage of %s and %s",
 "The used SELECT statements have a different number of columns",
+"Can't execute the query because you have a conflicting read lock",

sql/share/norwegian/errmsg.txt

@@ -220,3 +220,4 @@
 "Error when executing command %s: %-.128s",
 "Wrong usage of %s and %s",
 "The used SELECT statements have a different number of columns",
+"Can't execute the query because you have a conflicting read lock",

sql/share/polish/errmsg.txt

@@ -222,3 +222,4 @@
 "Error when executing command %s: %-.128s",
 "Wrong usage of %s and %s",
 "The used SELECT statements have a different number of columns",
+"Can't execute the query because you have a conflicting read lock",

sql/share/portuguese/errmsg.txt

@@ -218,3 +218,4 @@
 "Error when executing command %s: %-.128s",
 "Wrong usage of %s and %s",
 "The used SELECT statements have a different number of columns",
+"Can't execute the query because you have a conflicting read lock",

sql/share/romanian/errmsg.txt

@@ -222,3 +222,4 @@
 "Error when executing command %s: %-.128s",
 "Wrong usage of %s and %s",
 "The used SELECT statements have a different number of columns",
+"Can't execute the query because you have a conflicting read lock",

sql/share/russian/errmsg.txt

@@ -221,3 +221,4 @@
 "Error when executing command %s: %-.128s",
 "Wrong usage of %s and %s",
 "The used SELECT statements have a different number of columns",
+"Can't execute the query because you have a conflicting read lock",

sql/share/slovak/errmsg.txt

@@ -226,3 +226,4 @@
 "Error when executing command %s: %-.128s",
 "Wrong usage of %s and %s",
 "The used SELECT statements have a different number of columns",
+"Can't execute the query because you have a conflicting read lock",

sql/share/spanish/errmsg.txt

@@ -219,3 +219,4 @@
 "Error de %s: %-128%",
 "Wrong usage of %s and %s",
 "The used SELECT statements have a different number of columns",
+"Can't execute the query because you have a conflicting read lock",

sql/share/swedish/errmsg.OLD

@@ -205,9 +205,17 @@
 "Kunde inte initializera replications-strukturerna. Kontrollera privilegerna för 'master.info'",
 "Kunde inte starta en tråd för replikering",
 "Användare '%-.64s' har redan 'max_user_connections' aktiva inloggningar",
-"Du kan endast använda konstant-uttryck med SET",
-"Tiden att få ett lås var för lång",
-"Antal lås är större än vad som ryms i lock tabellen",
-"Du kan inte låsa tabeller/poster under READ UNCOMMITTED",
-"Fick fel vid inloggning till master: %-.128s",
-"Fick fel vid exekvering av fråga på master: %-.128s",
+"Man kan endast använda konstant-uttryck med SET",
+"Fick inte ett lås i tid",
+"Antal lås överskrider antalet reserverade lås",
+"Updaterings-lås kan inte göras när man använder READ UNCOMMITTED",
+"DROP DATABASE är inte tillåtet när man har ett globalt läs-lås",
+"CREATE DATABASE är inte tillåtet när man har ett globalt läs-lås",
+"Felaktiga argument till %s",
+"%-.32s@%-.64s har inte rättigheter att skapa nya användare",
+"Fick fel vid anslutning till master: %-.128s",
+"Fick fel vid utförande av command på mastern: %-.128s",
+"Fick fel vid utförande av %s: %-.128s",
+"Felaktig använding av %s and %s",
+"SELECT kommandona har olika antal kolumner"
+"Kan inte utföra kommandot emedan du har ett READ lås",

sql/share/swedish/errmsg.txt

@@ -218,3 +218,4 @@
 "Fick fel vid utförande av %s: %-.128s",
 "Felaktig använding av %s and %s",
 "SELECT kommandona har olika antal kolumner"
+"Kan inte utföra kommandot emedan du har ett READ lås",

sql/sql_acl.cc

@@ -1006,7 +1006,7 @@ static int replace_user_table(TABLE *table, const LEX_USER &combo,
 	my_printf_error(ER_NO_PERMISSION_TO_CREATE_USER,
 			ER(ER_NO_PERMISSION_TO_CREATE_USER),
 			MYF(0),thd->user,
-			thd->host ? thd->host : thd->ip ? thd->ip: "");
+			thd->host_or_ip);
       error= -1;
       goto end;
     }
@@ -1503,8 +1503,7 @@ static int replace_table_table(THD *thd, GRANT_TABLE *grant_table,
   uint store_table_rights,store_col_rights;
   DBUG_ENTER("replace_table_table");
 
-  strxmov(grantor,thd->user,"@",thd->host ? thd->host : thd->ip ? thd->ip :"",
-	  NullS);
+  strxmov(grantor, thd->user, "@", thd->host_or_ip, NullS);
 
   // The following should always succeed as new users are created before
   // this function is called!
@@ -2091,7 +2090,7 @@ bool check_grant(THD *thd, uint want_access, TABLE_LIST *tables,
     net_printf(&thd->net,ER_TABLEACCESS_DENIED_ERROR,
 	       command,
 	       thd->priv_user,
-	       thd->host ? thd->host : (thd->ip ? thd->ip : "unknown"),
+	       thd->host_or_ip,
 	       table ? table->real_name : "unknown");
   }
   return 1;
@@ -2154,7 +2153,7 @@ bool check_grant_column (THD *thd,TABLE *table, const char *name,
 		    MYF(0),
 		    command,
 		    thd->priv_user,
-		    thd->host ? thd->host : (thd->ip ? thd->ip : "unknown"),
+		    thd->host_or_ip,
 		    name,
 		    table ? table->real_name : "unknown");
   }
@@ -2212,7 +2211,7 @@ bool check_grant_all_columns(THD *thd,uint want_access, TABLE *table)
 		  MYF(0),
 		  command,
 		  thd->priv_user,
-		  thd->host ? thd->host : (thd->ip ? thd->ip : "unknown"),
+		  thd->host_or_ip,
 		  field ? field->field_name : "unknown",
 		  table->real_name);
   return 1;

sql/sql_class.cc

@@ -82,6 +82,7 @@ THD::THD():user_time(0),fatal_error(0),last_insert_id_used(0),
 	   global_read_lock(0),bootstrap(0)
 {
   host=user=priv_user=db=query=ip=0;
+  host_or_ip="unknown ip";
   locked=killed=count_cuted_fields=some_tables_deleted=no_errors=password=
     query_start_used=0;
   query_length=col_access=0;
@@ -183,12 +184,7 @@ THD::~THD()
   }
 #endif
   if (global_read_lock)
-  {
-    pthread_mutex_lock(&LOCK_open);
-    ::global_read_lock--;
-    pthread_cond_broadcast(&COND_refresh);
-    pthread_mutex_unlock(&LOCK_open);
-  }
+    unlock_global_read_lock(this);
   if (ull)
   {
     pthread_mutex_lock(&LOCK_user_locks);

sql/sql_class.h

@@ -239,7 +239,7 @@ public:
   struct  rand_struct rand;
   char	  *query,*thread_stack;
   char	  *host,*user,*priv_user,*db,*ip;
-  const   char *proc_info;
+  const   char *proc_info, *host_or_ip;
   uint	  client_capabilities,sql_mode,max_packet_length;
   uint	  master_access,db_access;
   TABLE   *open_tables,*temporary_tables, *handler_tables;

sql/sql_db.cc

@@ -348,11 +348,11 @@ bool mysql_change_db(THD *thd,const char *name)
   {
     net_printf(&thd->net,ER_DBACCESS_DENIED_ERROR,
 	       thd->priv_user,
-	       thd->host ? thd->host : thd->ip ? thd->ip : "unknown",
+	       thd->host_or_ip,
 	       dbname);
     mysql_log.write(thd,COM_INIT_DB,ER(ER_DBACCESS_DENIED_ERROR),
 		    thd->priv_user,
-		    thd->host ? thd->host : thd->ip ? thd->ip : "unknown",
+		    thd->host_or_ip,
 		    dbname);
     my_free(dbname,MYF(0));
     DBUG_RETURN(1);

sql/sql_delete.cc

@@ -35,26 +35,10 @@ int generate_table(THD *thd, TABLE_LIST *table_list, TABLE *locked_table)
   TABLE **table_ptr;
   DBUG_ENTER("generate_table");
 
+  if (wait_if_global_read_lock(thd,0))
+    DBUG_RETURN(1);
   thd->proc_info="generate_table";
-
-  if (global_read_lock)
-  {
-    if(thd->global_read_lock)
-    {
-      my_error(ER_TABLE_NOT_LOCKED_FOR_WRITE,MYF(0),
-	       table_list->real_name);
-      DBUG_RETURN(-1);
-    }
-    pthread_mutex_lock(&LOCK_open);
-    while (global_read_lock && ! thd->killed ||
-	   thd->version != refresh_version)
-    {
-      (void) pthread_cond_wait(&COND_refresh,&LOCK_open);
-    }
-    pthread_mutex_unlock(&LOCK_open);
-  }
-
-  
+ 
     /* If it is a temporary table, close and regenerate it */
   if ((table_ptr=find_temporary_table(thd,table_list->db,
 				      table_list->real_name)))
@@ -91,6 +75,7 @@ int generate_table(THD *thd, TABLE_LIST *table_list, TABLE *locked_table)
       if (!locked_table)
       {
 	VOID(pthread_mutex_unlock(&LOCK_open));
+	start_waiting_global_read_lock(thd);	
 	DBUG_RETURN(1);				// We must get a lock on table
       }
     }
@@ -118,6 +103,7 @@ int generate_table(THD *thd, TABLE_LIST *table_list, TABLE *locked_table)
     }
     send_ok(&thd->net);		// This should return record count
   }
+  start_waiting_global_read_lock(thd);
   DBUG_RETURN(error ? -1 : 0);
 }
 
@@ -298,7 +284,7 @@ int mysql_delete(THD *thd,
 
 int refposcmp2(void* arg, const void *a,const void *b)
 {
-  return memcmp(a,b,(int) arg);
+  return memcmp(a,b, *(int*) arg);
 }
 
 multi_delete::multi_delete(THD *thd_arg, TABLE_LIST *dt,
@@ -321,7 +307,7 @@ multi_delete::multi_delete(THD *thd_arg, TABLE_LIST *dt,
     (void) dt->table->file->extra(HA_EXTRA_NO_READCHECK);
     (void) dt->table->file->extra(HA_EXTRA_NO_KEYREAD);
     tempfiles[counter] = new Unique (refposcmp2,
-				     (void *) table->file->ref_length,
+				     (void *) &table->file->ref_length,
 				     table->file->ref_length,
 				     MEM_STRIP_BUF_SIZE);
   }

sql/sql_lex.h

@@ -55,8 +55,8 @@ enum enum_sql_command {
   SQLCOM_RESET, SQLCOM_PURGE, SQLCOM_SHOW_BINLOGS,
   SQLCOM_SHOW_OPEN_TABLES, SQLCOM_LOAD_MASTER_DATA,
   SQLCOM_HA_OPEN, SQLCOM_HA_CLOSE, SQLCOM_HA_READ,
-  SQLCOM_SHOW_SLAVE_HOSTS, SQLCOM_MULTI_DELETE, SQLCOM_UNION_SELECT,
-  SQLCOM_SHOW_BINLOG_EVENTS, SQLCOM_SHOW_NEW_MASTER, SQLCOM_NONE
+  SQLCOM_SHOW_SLAVE_HOSTS, SQLCOM_MULTI_DELETE,
+  SQLCOM_SHOW_BINLOG_EVENTS, SQLCOM_SHOW_NEW_MASTER,
 };
 
 enum lex_states { STATE_START, STATE_CHAR, STATE_IDENT,
@@ -106,7 +106,6 @@ enum sub_select_type {UNSPECIFIED_TYPE,UNION_TYPE, INTERSECT_TYPE, EXCEPT_TYPE};
 
 typedef struct st_select_lex {
   enum sub_select_type linkage;
-  uint select_number;                           /* For Item_select         */
   char *db,*db1,*table1,*db2,*table2;		/* For outer join using .. */
   Item *where,*having;
   ha_rows select_limit,offset_limit;

sql/sql_parse.cc

@@ -47,8 +47,7 @@ static void mysql_init_query(THD *thd);
 static void remove_escape(char *name);
 static void refresh_status(void);
 static bool append_file_to_dir(char **filename_ptr, char *table_name);
-static int create_total_list_and_check_acl(THD *thd, LEX *lex,
-					   TABLE_LIST **result, bool skip_first = false);
+static int create_total_list(THD *thd, LEX *lex, TABLE_LIST **result);
 static int handle_create_select(THD *thd, LEX *lex, select_result *c_i);
 
 const char *any_db="*any*";	// Special symbol for check_access
@@ -120,18 +119,18 @@ static bool check_user(THD *thd,enum_server_command command, const char *user,
   DBUG_PRINT("general",
 	     ("Capabilities: %d  packet_length: %d  Host: '%s'  User: '%s'  Using password: %s  Access: %u  db: '%s'",
 	      thd->client_capabilities, thd->max_packet_length,
-	      thd->host ? thd->host : thd->ip, thd->priv_user,
+	      thd->host_or_ip, thd->priv_user,
 	      passwd[0] ? "yes": "no",
 	      thd->master_access, thd->db ? thd->db : "*none*"));
   if (thd->master_access & NO_ACCESS)
   {
     net_printf(net, ER_ACCESS_DENIED_ERROR,
 	       thd->user,
-	       thd->host ? thd->host : thd->ip,
+	       thd->host_or_ip,
 	       passwd[0] ? ER(ER_YES) : ER(ER_NO));
     mysql_log.write(thd,COM_CONNECT,ER(ER_ACCESS_DENIED_ERROR),
 		    thd->user,
-		    thd->host ? thd->host : thd->ip ? thd->ip : "unknown ip",
+		    thd->host_or_ip,
 		    passwd[0] ? ER(ER_YES) : ER(ER_NO));
     return(1);					// Error already given
   }
@@ -152,7 +151,7 @@ static bool check_user(THD *thd,enum_server_command command, const char *user,
 		   (char*) "%s@%s on %s" :
 		   (char*) "%s@%s as anonymous on %s"),
 		  user,
-		  thd->host ? thd->host : thd->ip ? thd->ip : "unknown ip",
+		  thd->host_or_ip,
 		  db ? db : (char*) "");
   thd->db_access=0;
   if (max_user_connections &&
@@ -331,6 +330,7 @@ check_connections(THD *thd)
       return (ER_BAD_HOST_ERROR);
     if (!(thd->ip = my_strdup(ip,MYF(0))))
       return (ER_OUT_OF_RESOURCES);
+    thd->host_or_ip=thd->ip;
 #if !defined(HAVE_SYS_UN_H) || defined(HAVE_mit_thread)
     /* Fast local hostname resolve for Win32 */
     if (!strcmp(thd->ip,"127.0.0.1"))
@@ -353,6 +353,7 @@ check_connections(THD *thd)
   else /* Hostname given means that the connection was on a socket */
   {
     DBUG_PRINT("general",("Host: %s",thd->host));
+    thd->host_or_ip=thd->host;
     thd->ip=0;
     bzero((char*) &thd->remote,sizeof(struct sockaddr));
   }
@@ -531,7 +532,7 @@ pthread_handler_decl(handle_one_connection,arg)
     if ((error=check_connections(thd)))
     {						// Wrong permissions
       if (error > 0)
-	net_printf(net,error,thd->host ? thd->host : thd->ip);
+	net_printf(net,error,thd->host_or_ip);
 #ifdef __NT__
       if (vio_type(net->vio) == VIO_TYPE_NAMEDPIPE)
 	sleep(1);				/* must wait after eof() */
@@ -562,7 +563,7 @@ pthread_handler_decl(handle_one_connection,arg)
       sql_print_error(ER(ER_NEW_ABORTING_CONNECTION),
 		      thd->thread_id,(thd->db ? thd->db : "unconnected"),
 		      thd->user ? thd->user : "unauthenticated",
-		      (thd->host ? thd->host : thd->ip ? thd->ip : "unknown"),
+		      thd->host_or_ip,
 		      (net->last_errno ? ER(net->last_errno) :
 		       ER(ER_UNKNOWN_ERROR)));
       send_error(net,net->last_errno,NullS);
@@ -694,9 +695,8 @@ int mysql_table_dump(THD* thd, char* db, char* tbl_name, int fd)
       goto err;
     }
   net_flush(&thd->net);
-  error = table->file->dump(thd,fd);
-  if(error)
-      my_error(ER_GET_ERRNO, MYF(0));
+  if ((error = table->file->dump(thd,fd)))
+    my_error(ER_GET_ERRNO, MYF(0));
 
 err:
 
@@ -763,7 +763,7 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
   thread_running++;
   VOID(pthread_mutex_unlock(&LOCK_thread_count));
   thd->set_time();
-  thd->lex.select_lex.options=0;				// We store status here
+  thd->lex.select_lex.options=0;		// We store status here
   switch (command) {
   case COM_INIT_DB:
     if (!mysql_change_db(thd,packet))
@@ -1073,10 +1073,13 @@ mysql_execute_command(void)
   SELECT_LEX *select_lex = lex->select;
   DBUG_ENTER("mysql_execute_command");
 
-  if(table_rules_on && thd->slave_thread && tables && !tables_ok(thd,tables))
-    DBUG_VOID_RETURN; // skip if we are in the slave thread, some table
-  // rules have been given and the table list says the query should not be
-  // replicated
+  /*
+    Skip if we are in the slave thread, some table rules have been given
+    and the table list says the query should not be replicated
+    TODO: UPDATE this for UNION
+  */
+  if (table_rules_on && thd->slave_thread && tables && !tables_ok(thd,tables))
+    DBUG_VOID_RETURN;
   
   switch (lex->sql_command) {
   case SQLCOM_SELECT:
@@ -1084,6 +1087,9 @@ mysql_execute_command(void)
     select_result *result;
     if (select_lex->options & SELECT_DESCRIBE)
       lex->exchange=0;
+    /* Save a call, as it's very uncomon that we use unions */
+    if (lex->select_lex.next && (res = create_total_list(thd,lex,&tables)))
+      break;
     if (tables)
     {
       res=check_table_access(thd,
@@ -1148,33 +1154,18 @@ mysql_execute_command(void)
     }
 
     if (!(res=open_and_lock_tables(thd,tables)))
-    {
-      res=mysql_select(thd,tables,select_lex->item_list,
-		       select_lex->where,
-                       select_lex->ftfunc_list,
-		       (ORDER*) select_lex->order_list.first,
-		       (ORDER*) select_lex->group_list.first,
-		       select_lex->having,
-		       (ORDER*) lex->proc_list.first,
-		       select_lex->options | thd->options,
-		       result);
-      if (res)
-	result->abort();
-    }
-    delete result;
-#ifdef DELETE_ITEMS
-    delete select_lex->having;
-    delete select_lex->where;
-#endif
+      res=handle_select(thd, lex, result);
+    else
+      delete result;
     break;
   }
   case SQLCOM_PURGE:
-    {
-      if (check_process_priv(thd))
-	goto error;
-      res = purge_master_logs(thd, lex->to_log);
-      break;
-    }
+  {
+    if (check_process_priv(thd))
+      goto error;
+    res = purge_master_logs(thd, lex->to_log);
+    break;
+  }
   case SQLCOM_SHOW_NEW_MASTER:
   {
     if(check_access(thd, FILE_ACL, any_db))
@@ -1197,45 +1188,45 @@ mysql_execute_command(void)
     break;
   }
   case SQLCOM_BACKUP_TABLE:
-    {
-      if (check_db_used(thd,tables) ||
-	  check_table_access(thd,SELECT_ACL, tables) ||
-	  check_access(thd, FILE_ACL, any_db))
-	goto error; /* purecov: inspected */
-      res = mysql_backup_table(thd, tables);
+  {
+    if (check_db_used(thd,tables) ||
+	check_table_access(thd,SELECT_ACL, tables) ||
+	check_access(thd, FILE_ACL, any_db))
+      goto error; /* purecov: inspected */
+    res = mysql_backup_table(thd, tables);
 
-      break;
-    }
+    break;
+  }
   case SQLCOM_RESTORE_TABLE:
-    {
-      if (check_db_used(thd,tables) ||
-	  check_table_access(thd,INSERT_ACL, tables) ||
-	  check_access(thd, FILE_ACL, any_db))
-	goto error; /* purecov: inspected */
-      res = mysql_restore_table(thd, tables);
-      break;
-    }
+  {
+    if (check_db_used(thd,tables) ||
+	check_table_access(thd,INSERT_ACL, tables) ||
+	check_access(thd, FILE_ACL, any_db))
+      goto error; /* purecov: inspected */
+    res = mysql_restore_table(thd, tables);
+    break;
+  }
   case SQLCOM_CHANGE_MASTER:
-    {
-      if(check_access(thd, PROCESS_ACL, any_db))
-	goto error;
-      res = change_master(thd);
-      break;
-    }
+  {
+    if(check_access(thd, PROCESS_ACL, any_db))
+      goto error;
+    res = change_master(thd);
+    break;
+  }
   case SQLCOM_SHOW_SLAVE_STAT:
-    {
-      if (check_process_priv(thd))
-	goto error;
-      res = show_master_info(thd);
-      break;
-    }
+  {
+    if (check_process_priv(thd))
+      goto error;
+    res = show_master_info(thd);
+    break;
+  }
   case SQLCOM_SHOW_MASTER_STAT:
-    {
-      if (check_process_priv(thd))
-	goto error;
-      res = show_binlog_info(thd);
-      break;
-    }
+  {
+    if (check_process_priv(thd))
+      goto error;
+    res = show_binlog_info(thd);
+    break;
+  }
     
   case SQLCOM_LOAD_MASTER_DATA: // sync with master
     if(check_process_priv(thd))
@@ -1257,7 +1248,7 @@ mysql_execute_command(void)
       bool error=check_grant(thd,CREATE_ACL,tables);
       tables->next=tmp_table_list;
       if (error)
-	  goto error;
+	goto error;
     }
     if (strlen(tables->name) > NAME_LEN)
     {
@@ -1304,6 +1295,8 @@ mysql_execute_command(void)
     if (select_lex->item_list.elements)		// With select
     {
       select_result *result;
+      if ((res = create_total_list(thd,lex,&tables)))
+	break;
 
       if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) &&
 	  check_dup(thd,tables->db,tables->real_name,tables->next))
@@ -1323,15 +1316,22 @@ mysql_execute_command(void)
       thd->select_limit=select_lex->select_limit+select_lex->offset_limit;
       if (thd->select_limit < select_lex->select_limit)
 	thd->select_limit= HA_POS_ERROR;		// No limit
-			if ((result=new select_create(tables->db ? tables->db : thd->db,
-				      tables->real_name, &lex->create_info,
-				      lex->create_list,
-				      lex->key_list,
-				      select_lex->item_list,lex->duplicates)))
-				res=handle_create_select(thd,lex,result);
-			else
-				res= -1;
-		}
+
+      /* Skip first table, which is the table we are creating */
+      lex->select_lex.table_list.first=
+	(byte*) (((TABLE_LIST *) lex->select_lex.table_list.first)->next);
+      if (!(res=open_and_lock_tables(thd,tables->next)))
+      {
+        if ((result=new select_create(tables->db ? tables->db : thd->db,
+                                      tables->real_name, &lex->create_info,
+                                      lex->create_list,
+                                      lex->key_list,
+                                      select_lex->item_list,lex->duplicates)))
+          res=handle_select(thd, lex, result);
+	else
+	  res= -1;
+      }
+    }
     else // regular create
     {
       res = mysql_create_table(thd,tables->db ? tables->db : thd->db,
@@ -1438,7 +1438,7 @@ mysql_execute_command(void)
 	old_list.next=new_list.next=0;
 	if (check_grant(thd,ALTER_ACL,&old_list) ||
 	    (!test_all_bits(table->next->grant.privilege,
-			   INSERT_ACL | CREATE_ACL) &&
+			    INSERT_ACL | CREATE_ACL) &&
 	     check_grant(thd,INSERT_ACL | CREATE_ACL, &new_list)))
 	  goto error;
       }
@@ -1476,21 +1476,21 @@ mysql_execute_command(void)
     }
 #endif
   case SQLCOM_REPAIR:
-    {
-      if (check_db_used(thd,tables) ||
-	  check_table_access(thd,SELECT_ACL | INSERT_ACL, tables))
-	goto error; /* purecov: inspected */
-      res = mysql_repair_table(thd, tables, &lex->check_opt);
-      break;
-    }
+  {
+    if (check_db_used(thd,tables) ||
+	check_table_access(thd,SELECT_ACL | INSERT_ACL, tables))
+      goto error; /* purecov: inspected */
+    res = mysql_repair_table(thd, tables, &lex->check_opt);
+    break;
+  }
   case SQLCOM_CHECK:
-    {
-      if (check_db_used(thd,tables) ||
-	  check_table_access(thd, SELECT_ACL | EXTRA_ACL , tables))
-	goto error; /* purecov: inspected */
-      res = mysql_check_table(thd, tables, &lex->check_opt);
-      break;
-    }
+  {
+    if (check_db_used(thd,tables) ||
+	check_table_access(thd, SELECT_ACL | EXTRA_ACL , tables))
+      goto error; /* purecov: inspected */
+    res = mysql_check_table(thd, tables, &lex->check_opt);
+    break;
+  }
   case SQLCOM_ANALYZE:
   {
     if (check_db_used(thd,tables) ||
@@ -1574,6 +1574,9 @@ mysql_execute_command(void)
   case SQLCOM_REPLACE_SELECT:
   case SQLCOM_INSERT_SELECT:
   {
+    if ((res = create_total_list(thd,lex,&tables)))
+      break;
+
     // Check that we have modify privileges for the first table and
     // select privileges for the rest
     {
@@ -1596,81 +1599,30 @@ mysql_execute_command(void)
     if (thd->select_limit < select_lex->select_limit)
       thd->select_limit= HA_POS_ERROR;		// No limit
 
-		if (lex->select_lex.next)
-		{
-			TABLE_LIST *total;
-			if ((res = create_total_list_and_check_acl(thd,lex,&total)))
-				goto error;
-			if (check_dup(thd,total->db,total->real_name,total->next))
-			{
-				net_printf(&thd->net,ER_INSERT_TABLE_USED,total->real_name);
-				DBUG_VOID_RETURN;
-			}
-			total->lock_type=TL_WRITE;				// update first table
-			{
-				TABLE_LIST *table;
-				for (table = total->next ; table ; table=table->next)
-					table->lock_type= lex->lock_option;
-			}
-			if (!(res=open_and_lock_tables(thd, total)))
-			{
-				if ((result=new select_insert(total->table,&lex->field_list,
-																			lex->sql_command == SQLCOM_REPLACE_SELECT ?
-																			DUP_REPLACE : DUP_IGNORE)))
-				{
-
-					for (SELECT_LEX *sl=&lex->select_lex; sl; sl=sl->next)
-					{
-						TABLE_LIST *help=(TABLE_LIST *)sl->table_list.first;
-						if (sl==&lex->select_lex) help=help->next;
-						for (TABLE_LIST *cursor= help;
-								 cursor;
-								 cursor=cursor->next)
-							cursor->table= ((TABLE_LIST*) cursor->table)->table;
-					}
-					res=mysql_union(thd,lex,result);
-				}
-				close_thread_tables(thd);
-			}
-		}
-		else
-		{
-			if (check_dup(thd,tables->db,tables->real_name,tables->next))
-			{
-				net_printf(&thd->net,ER_INSERT_TABLE_USED,tables->real_name);
-				DBUG_VOID_RETURN;
-			}
-			tables->lock_type=TL_WRITE;				// update first table
-			{
-				TABLE_LIST *table;
-				for (table = tables->next ; table ; table=table->next)
-					table->lock_type= lex->lock_option;
-			}
-			if (!(res=open_and_lock_tables(thd,tables)))
-			{
-				if ((result=new select_insert(tables->table,&lex->field_list,
-																			lex->sql_command == SQLCOM_REPLACE_SELECT ?
-																			DUP_REPLACE : DUP_IGNORE)))
-				{
-					res=mysql_select(thd,tables->next,select_lex->item_list,
-													 select_lex->where,
-													 select_lex->ftfunc_list,
-													 (ORDER*) select_lex->order_list.first,
-													 (ORDER*) select_lex->group_list.first,
-													 select_lex->having,
-													 (ORDER*) lex->proc_list.first,
-													 select_lex->options | thd->options,
-													 result);
-					delete result;
-				}
-				else
-					res= -1;
-			}
+    if (check_dup(thd,tables->db,tables->real_name,tables->next))
+    {
+      net_printf(&thd->net,ER_INSERT_TABLE_USED,tables->real_name);
+      DBUG_VOID_RETURN;
     }
-#ifdef DELETE_ITEMS
-    delete select_lex->having;
-    delete select_lex->where;
-#endif
+    tables->lock_type=TL_WRITE;		// update first table
+    {
+      TABLE_LIST *table;
+      for (table = tables->next ; table ; table=table->next)
+	table->lock_type= lex->lock_option;
+    }
+
+    /* Skip first table, which is the table we are inserting in */
+    lex->select_lex.table_list.first=
+      (byte*) (((TABLE_LIST *) lex->select_lex.table_list.first)->next);
+    if (!(res=open_and_lock_tables(thd, tables)))
+    {
+      if ((result=new select_insert(tables->table,&lex->field_list,
+				    lex->sql_command == SQLCOM_REPLACE_SELECT ?
+				    DUP_REPLACE : DUP_IGNORE)))
+	res=handle_select(thd,lex,result);
+    }
+    else
+      res= -1;
     break;
   }
   case SQLCOM_TRUNCATE:
@@ -1760,39 +1712,6 @@ mysql_execute_command(void)
     close_thread_tables(thd);
     break;
   }
-  case SQLCOM_UNION_SELECT:
-  {
-    TABLE_LIST *total;
-    if (select_lex->options & SELECT_DESCRIBE)
-      lex->exchange=0;
-    if ((res = create_total_list_and_check_acl(thd,lex,&total)) == -1)
-    {
-      res=0;
-      break;
-    }
-    if (res &&
-	(res=check_access(thd,
-			  lex->exchange ? SELECT_ACL | FILE_ACL : SELECT_ACL,
-			  any_db)))
-    {
-      res=0;
-      break;
-    }
-    if (!(res=open_and_lock_tables(thd, total)))
-    {
-      /* Fix tables--to-be-unioned-from list to point at opened tables */
-      for (SELECT_LEX *sl=&lex->select_lex; sl; sl=sl->next)
-      {
-	for (TABLE_LIST *cursor= (TABLE_LIST *)sl->table_list.first;
-	     cursor;
-	     cursor=cursor->next)
-	  cursor->table= ((TABLE_LIST*) cursor->table)->table;
-      }
-      res=mysql_union(thd,lex);
-    }
-    close_thread_tables(thd);
-    break;
-  }
   case SQLCOM_DROP_TABLE:
   {
     if (check_table_access(thd,DROP_ACL,tables))
@@ -1952,7 +1871,7 @@ mysql_execute_command(void)
     else
     {
       if (check_access(thd,privilege,tables->db,&tables->grant.privilege) ||
-	 grant_option && check_grant(thd,privilege,tables))
+	  grant_option && check_grant(thd,privilege,tables))
 	goto error;
     }
     res=mysql_load(thd, lex->exchange, tables, lex->field_list,
@@ -2006,13 +1925,7 @@ mysql_execute_command(void)
       end_active_trans(thd);
     }
     if (thd->global_read_lock)
-    {
-      thd->global_read_lock=0;
-      pthread_mutex_lock(&LOCK_open);
-      global_read_lock--;
-      pthread_cond_broadcast(&COND_refresh);
-      pthread_mutex_unlock(&LOCK_open);
-    }
+      unlock_global_read_lock(thd);
     send_ok(&thd->net);
     break;
   case SQLCOM_LOCK_TABLES:
@@ -2036,30 +1949,30 @@ mysql_execute_command(void)
     thd->in_lock_tables=0;
     break;
   case SQLCOM_CREATE_DB:
+  {
+    if (!stripp_sp(lex->name) || check_db_name(lex->name))
     {
-      if (!stripp_sp(lex->name) || check_db_name(lex->name))
-      {
-	net_printf(&thd->net,ER_WRONG_DB_NAME, lex->name);
-	break;
-      }
-      if (check_access(thd,CREATE_ACL,lex->name,0,1))
-	break;
-      mysql_create_db(thd,lex->name,lex->create_info.options);
+      net_printf(&thd->net,ER_WRONG_DB_NAME, lex->name);
       break;
     }
+    if (check_access(thd,CREATE_ACL,lex->name,0,1))
+      break;
+    mysql_create_db(thd,lex->name,lex->create_info.options);
+    break;
+  }
   case SQLCOM_DROP_DB:
+  {
+    if (!stripp_sp(lex->name) || check_db_name(lex->name))
     {
-      if (!stripp_sp(lex->name) || check_db_name(lex->name))
-      {
-	net_printf(&thd->net,ER_WRONG_DB_NAME, lex->name);
-	break;
-      }
-      if (check_access(thd,DROP_ACL,lex->name,0,1) ||
-	  end_active_trans(thd))
-	break;
-      mysql_rm_db(thd,lex->name,lex->drop_if_exists);
+      net_printf(&thd->net,ER_WRONG_DB_NAME, lex->name);
       break;
     }
+    if (check_access(thd,DROP_ACL,lex->name,0,1) ||
+	end_active_trans(thd))
+      break;
+    mysql_rm_db(thd,lex->name,lex->drop_if_exists);
+    break;
+  }
   case SQLCOM_CREATE_FUNCTION:
     if (check_access(thd,INSERT_ACL,"mysql",0,1))
       break;
@@ -2080,78 +1993,78 @@ mysql_execute_command(void)
     res= -1;
 #endif
     break;
- case SQLCOM_REVOKE:
- case SQLCOM_GRANT:
-   {
-     if (tables && !tables->db)
-       tables->db=thd->db;
-     if (check_access(thd, lex->grant | lex->grant_tot_col | GRANT_ACL,
-		      tables && tables->db ? tables->db : select_lex->db,
-		      tables ? &tables->grant.privilege : 0,
-		      tables ? 0 : 1))
-       goto error;
-
-     /* Check that the user isn't trying to change a password for another
-	user if he doesn't have UPDATE privilege to the MySQL database */
-
-     if (thd->user)				// If not replication
-     {
-       LEX_USER *user;
-       List_iterator <LEX_USER> user_list(lex->users_list);
-       while ((user=user_list++))
-       {
-	 if (user->password.str &&
-	     (strcmp(thd->user,user->user.str) ||
-	      user->host.str &&
-	      my_strcasecmp(user->host.str, thd->host ? thd->host : thd->ip)))
-	 {
-	   if (check_access(thd, UPDATE_ACL, "mysql",0,1))
-	     goto error;
-	   break;			// We are allowed to do changes
-	 }
-       }
-     }
-     if (tables)
-     {
-       if (grant_option && check_grant(thd,
-				       (lex->grant | lex->grant_tot_col |
-					GRANT_ACL),
-				       tables))
-	 goto error;
-       res = mysql_table_grant(thd,tables,lex->users_list, lex->columns,
-			       lex->grant, lex->sql_command == SQLCOM_REVOKE);
-       if(!res)
-       {
-	 mysql_update_log.write(thd, thd->query,thd->query_length);
-	 if (mysql_bin_log.is_open())
-	 {
-	   Query_log_event qinfo(thd, thd->query);
-	   mysql_bin_log.write(&qinfo);
-	 }
-       }
-     }
-     else
-     {
-       if (lex->columns.elements)
-       {
-	 net_printf(&thd->net,ER_ILLEGAL_GRANT_FOR_TABLE);
-	 res=1;
-       }
-       else
-	 res = mysql_grant(thd, select_lex->db, lex->users_list, lex->grant,
-			   lex->sql_command == SQLCOM_REVOKE);
-       if (!res)
-       {
-	 mysql_update_log.write(thd, thd->query,thd->query_length);
-	 if (mysql_bin_log.is_open())
-	 {
-	   Query_log_event qinfo(thd, thd->query);
-	   mysql_bin_log.write(&qinfo);
-	 }
-       }
-     }
-     break;
-   }
+  case SQLCOM_REVOKE:
+  case SQLCOM_GRANT:
+  {
+    if (tables && !tables->db)
+      tables->db=thd->db;
+    if (check_access(thd, lex->grant | lex->grant_tot_col | GRANT_ACL,
+		     tables && tables->db ? tables->db : select_lex->db,
+		     tables ? &tables->grant.privilege : 0,
+		     tables ? 0 : 1))
+      goto error;
+
+    /* Check that the user isn't trying to change a password for another
+       user if he doesn't have UPDATE privilege to the MySQL database */
+
+    if (thd->user)				// If not replication
+    {
+      LEX_USER *user;
+      List_iterator <LEX_USER> user_list(lex->users_list);
+      while ((user=user_list++))
+      {
+	if (user->password.str &&
+	    (strcmp(thd->user,user->user.str) ||
+	     user->host.str &&
+	     my_strcasecmp(user->host.str, thd->host_or_ip)))
+	{
+	  if (check_access(thd, UPDATE_ACL, "mysql",0,1))
+	    goto error;
+	  break;			// We are allowed to do changes
+	}
+      }
+    }
+    if (tables)
+    {
+      if (grant_option && check_grant(thd,
+				      (lex->grant | lex->grant_tot_col |
+				       GRANT_ACL),
+				      tables))
+	goto error;
+      res = mysql_table_grant(thd,tables,lex->users_list, lex->columns,
+			      lex->grant, lex->sql_command == SQLCOM_REVOKE);
+      if(!res)
+      {
+	mysql_update_log.write(thd, thd->query,thd->query_length);
+	if (mysql_bin_log.is_open())
+	{
+	  Query_log_event qinfo(thd, thd->query);
+	  mysql_bin_log.write(&qinfo);
+	}
+      }
+    }
+    else
+    {
+      if (lex->columns.elements)
+      {
+	net_printf(&thd->net,ER_ILLEGAL_GRANT_FOR_TABLE);
+	res=1;
+      }
+      else
+	res = mysql_grant(thd, select_lex->db, lex->users_list, lex->grant,
+			  lex->sql_command == SQLCOM_REVOKE);
+      if (!res)
+      {
+	mysql_update_log.write(thd, thd->query,thd->query_length);
+	if (mysql_bin_log.is_open())
+	{
+	  Query_log_event qinfo(thd, thd->query);
+	  mysql_bin_log.write(&qinfo);
+	}
+      }
+    }
+    break;
+  }
   case SQLCOM_FLUSH:
   case SQLCOM_RESET:
     if (check_access(thd,RELOAD_ACL,any_db) || check_db_used(thd, tables))
@@ -2166,14 +2079,16 @@ mysql_execute_command(void)
     break;
   case SQLCOM_SHOW_GRANTS:
     res=0;
-    if ((thd->priv_user && !strcmp(thd->priv_user,lex->grant_user->user.str)) ||
+    if ((thd->priv_user &&
+	 !strcmp(thd->priv_user,lex->grant_user->user.str)) ||
 	!check_access(thd, SELECT_ACL, "mysql",0,1))
     {
       res = mysql_show_grants(thd,lex->grant_user);
     }
     break;
   case SQLCOM_HA_OPEN:
-    if (check_db_used(thd,tables) || check_table_access(thd,SELECT_ACL, tables))
+    if (check_db_used(thd,tables) ||
+	check_table_access(thd,SELECT_ACL, tables))
       goto error;
     res = mysql_ha_open(thd, tables);
     break;
@@ -2183,11 +2098,12 @@ mysql_execute_command(void)
     res = mysql_ha_close(thd, tables);
     break;
   case SQLCOM_HA_READ:
-    if (check_db_used(thd,tables) || check_table_access(thd,SELECT_ACL, tables))
+    if (check_db_used(thd,tables) ||
+	check_table_access(thd,SELECT_ACL, tables))
       goto error;
     res = mysql_ha_read(thd, tables, lex->ha_read_mode, lex->backup_dir,
-                    lex->insert_list, lex->ha_rkey_mode, select_lex->where,
-	            select_lex->select_limit, select_lex->offset_limit);
+			lex->insert_list, lex->ha_rkey_mode, select_lex->where,
+			select_lex->select_limit, select_lex->offset_limit);
     break;
 
   case SQLCOM_BEGIN:
@@ -2278,7 +2194,7 @@ check_access(THD *thd,uint want_access,const char *db, uint *save_priv,
   {						// We can never grant this
     net_printf(&thd->net,ER_ACCESS_DENIED_ERROR,
 	       thd->priv_user,
-	       thd->host ? thd->host : (thd->ip ? thd->ip : "unknown"),
+	       thd->host_or_ip,
 	       thd->password ? ER(ER_YES) : ER(ER_NO));/* purecov: tested */
     return TRUE;				/* purecov: tested */
   }
@@ -2301,7 +2217,7 @@ check_access(THD *thd,uint want_access,const char *db, uint *save_priv,
     return FALSE;				/* Ok */
   net_printf(&thd->net,ER_DBACCESS_DENIED_ERROR,
 	     thd->priv_user,
-	     thd->host ? thd->host : (thd->ip ? thd->ip : "unknown"),
+	     thd->host_or_ip,
 	     db ? db : thd->db ? thd->db : "unknown"); /* purecov: tested */
   return TRUE;					/* purecov: tested */
 }
@@ -2458,7 +2374,6 @@ mysql_init_query(THD *thd)
   thd->fatal_error=0;				// Safety
   thd->last_insert_id_used=thd->query_start_used=thd->insert_id_used=0;
   thd->sent_row_count=thd->examined_row_count=0;
-	thd->lex.sql_command=SQLCOM_NONE;
   DBUG_VOID_RETURN;
 }
 
@@ -2470,7 +2385,7 @@ mysql_init_select(LEX *lex)
   select_lex->select_limit=current_thd->default_select_limit;
   select_lex->offset_limit=0;
   select_lex->options=0; select_lex->linkage=UNSPECIFIED_TYPE;
-  select_lex->select_number = 0;  lex->exchange = 0;
+  lex->exchange = 0;
   lex->proc_list.first=0;
   select_lex->order_list.elements=select_lex->group_list.elements=0;
   select_lex->order_list.first=0;
@@ -2483,12 +2398,9 @@ mysql_init_select(LEX *lex)
 void
 mysql_new_select(LEX *lex)
 {
-  uint select_no=lex->select->select_number;
   SELECT_LEX *select_lex = (SELECT_LEX *) lex->thd->calloc(sizeof(SELECT_LEX));
   lex->select->next=select_lex; 
-  lex->select=select_lex; select_lex->select_number = ++select_no;
-  select_lex->table_list.elements=0;
-  select_lex->table_list.first=0;
+  lex->select=select_lex;
   select_lex->table_list.next= (byte**) &select_lex->table_list.first;
   select_lex->item_list.empty(); select_lex->when_list.empty(); 
   select_lex->expr_list.empty();  select_lex->interval_list.empty(); 
@@ -2871,7 +2783,6 @@ TABLE_LIST *add_table_to_list(Table_ident *table, LEX_STRING *alias,
   register TABLE_LIST *ptr;
   THD	*thd=current_thd;
   char *alias_str;
-  const char *current_db;
   DBUG_ENTER("add_table_to_list");
 
   if (!table)
@@ -2887,14 +2798,14 @@ TABLE_LIST *add_table_to_list(Table_ident *table, LEX_STRING *alias,
 
 #ifdef FN_LOWER_CASE
   if (!alias)					/* Alias is case sensitive */
-    if (!(alias_str=sql_strmake(alias_str,table->table.length)))
+    if (!(alias_str=thd->memdup(alias_str,table->table.length+1)))
       DBUG_RETURN(0);
   if (lower_case_table_names)
     casedn_str(table->table.str);
 #endif
   if (!(ptr = (TABLE_LIST *) thd->calloc(sizeof(TABLE_LIST))))
     DBUG_RETURN(0);				/* purecov: inspected */
-  ptr->db= table->db.str;
+  ptr->db= table->db.str ? table->db.str : (thd->db ? thd->db : (char*) "");
   ptr->real_name=table->table.str;
   ptr->name=alias_str;
   ptr->lock_type=flags;
@@ -2907,16 +2818,12 @@ TABLE_LIST *add_table_to_list(Table_ident *table, LEX_STRING *alias,
 						   sizeof(*ignore_index));
 
   /* check that used name is unique */
-  current_db=thd->db ? thd->db : "";
-
   if (flags != TL_IGNORE)
   {
     for (TABLE_LIST *tables=(TABLE_LIST*) thd->lex.select->table_list.first ; tables ;
 	 tables=tables->next)
     {
-      if (!strcmp(alias_str,tables->name) &&
-	  !strcmp(ptr->db ? ptr->db : current_db,
-		  tables->db ? tables->db : current_db))
+      if (!strcmp(alias_str,tables->name) && !strcmp(ptr->db, tables->db))
       {
 	net_printf(&thd->net,ER_NONUNIQ_TABLE,alias_str); /* purecov: tested */
 	DBUG_RETURN(0);				/* purecov: tested */
@@ -2934,40 +2841,37 @@ TABLE_LIST *add_table_to_list(Table_ident *table, LEX_STRING *alias,
 ** to the entries in this list.
 */
 
-static int create_total_list_and_check_acl(THD *thd, LEX *lex,
-					   TABLE_LIST **result, bool skip_first = false)
+static int create_total_list(THD *thd, LEX *lex, TABLE_LIST **result)
 {
+  /* Handle the case when we are not using union */
+  if (!lex->select_lex.next)
+  {
+    *result= (TABLE_LIST*) lex->select_lex.table_list.first;
+    return 0;
+  }
+
   SELECT_LEX *sl;
   TABLE_LIST **new_table_list= result, *aux;
-  const char *current_db=thd->db ? thd->db : ""; // QQ;  To be removed
   
   *new_table_list=0;				// end result list
   for (sl= &lex->select_lex; sl; sl=sl->next)
   {
-    if ((lex->sql_command == SQLCOM_UNION_SELECT) &&
-	sl->order_list.first && sl->next)
+    if (sl->order_list.first && sl->next)
     {
-      net_printf(&thd->net,ER_WRONG_USAGE,"UNION","ORDER BY");
+      my_error(ER_WRONG_USAGE,MYF(0),"UNION","ORDER BY");
       return -1;
     }
-    aux= (TABLE_LIST*) sl->table_list.first;
-		if (skip_first && sl == &lex->select_lex) aux=aux->next;
-    if (aux)
+    if ((aux= (TABLE_LIST*) sl->table_list.first))
     {
       TABLE_LIST *next;
-      if (check_table_access(thd,
-			     lex->exchange ?
-			     SELECT_ACL | FILE_ACL : SELECT_ACL , aux))
-	return -1;
       for (; aux; aux=next)
       {
 	TABLE_LIST *cursor;
 	next= aux->next;
-	if (!aux->db)
-	  aux->db=(char *)current_db;		// QQ;  To be removed
 	for (cursor= *result; cursor; cursor=cursor->next)
 	  if (!strcmp(cursor->db,aux->db) &&
-	      (!strcmp(cursor->real_name,aux->real_name)))
+	      !strcmp(cursor->real_name,aux->real_name) &&
+	      !strcmp(cursor->name, aux->name))
 	    break;
 	if (!cursor)
 	{
@@ -2975,7 +2879,7 @@ static int create_total_list_and_check_acl(THD *thd, LEX *lex,
 	  aux->lock_type= lex->lock_option;
 	  if (!(cursor = (TABLE_LIST *) thd->memdup((byte*) aux,
 						    sizeof(*aux))))
-	    return 1;
+	    return -1;
 	  *new_table_list= cursor;
 	  new_table_list= &cursor->next;
 	  *new_table_list=0;				// end result list
@@ -2987,51 +2891,6 @@ static int create_total_list_and_check_acl(THD *thd, LEX *lex,
   return 0;
 }
 
-static int handle_create_select(THD *thd, LEX *lex, select_result *c_i)
-{
-	int res;
-	if (lex->select_lex.next)
-	{
-		TABLE_LIST *total;
-		if ((res = create_total_list_and_check_acl(thd,lex,&total,true)))
-			return res;
-    if (!(res=open_and_lock_tables(thd, total)))
-    {
-      for (SELECT_LEX *sl=&lex->select_lex; sl; sl=sl->next)
-      {
-				TABLE_LIST *help=(TABLE_LIST *)sl->table_list.first;
-				if (sl==&lex->select_lex) help=help->next;
-				for (TABLE_LIST *cursor= help;
-						 cursor;
-						 cursor=cursor->next)
-					cursor->table= ((TABLE_LIST*) cursor->table)->table;
-      }
-      res=mysql_union(thd,lex,c_i);
-    }
-    close_thread_tables(thd);
-	}
-	else
-	{
-		TABLE_LIST *tables=(TABLE_LIST*) lex->select_lex.table_list.first;
-		SELECT_LEX *select_lex=&lex->select_lex;
-		if (!(res=open_and_lock_tables(thd,tables->next)))
-		{
-			res=mysql_select(thd,tables->next,select_lex->item_list,
-											 select_lex->where,
-											 select_lex->ftfunc_list,
-											 (ORDER*) select_lex->order_list.first,
-											 (ORDER*) select_lex->group_list.first,
-											 select_lex->having,
-											 (ORDER*) lex->proc_list.first,
-											 select_lex->options | thd->options,
-											 c_i);
-		}
-	}
-	if (res)
-		c_i->abort();
-	delete c_i;
-	return res;
-}
 
 void add_join_on(TABLE_LIST *b,Item *expr)
 {
@@ -3055,10 +2914,8 @@ void add_join_natural(TABLE_LIST *a,TABLE_LIST *b)
 static bool check_dup(THD *thd,const char *db,const char *name,
 		      TABLE_LIST *tables)
 {
-  const char *thd_db=thd->db ? thd->db : any_db;
   for (; tables ; tables=tables->next)
-    if (!strcmp(name,tables->real_name) &&
-	!strcmp(db ? db : thd_db, tables->db ? tables->db : thd_db))
+    if (!strcmp(name,tables->real_name) && !strcmp(db,tables->db))
       return 1;
   return 0;
 }
@@ -3085,10 +2942,10 @@ bool reload_acl_and_cache(THD *thd, uint options, TABLE_LIST *tables)
   }
   if (options & (REFRESH_TABLES | REFRESH_READ_LOCK))
   {
-    if ((options & REFRESH_READ_LOCK) && thd && ! thd->global_read_lock)
+    if ((options & REFRESH_READ_LOCK) && thd)
     {
-      thd->global_read_lock=1;
-      thread_safe_increment(global_read_lock,&LOCK_open);
+      if (lock_global_read_lock(thd))
+	return 1;
     }
     result=close_cached_tables(thd,(options & REFRESH_FAST) ? 0 : 1, tables);
   }

sql/sql_repl.cc

@@ -84,7 +84,9 @@ static int fake_rotate_event(NET* net, String* packet, char* log_file_name,
   int2store(header + FLAGS_OFFSET, 0);
   int4store(header + LOG_SEQ_OFFSET, 0);
   packet->append(header, sizeof(header));
-  int8store(buf, 4); // tell slave to skip magic number
+  /* We need to split the next statement because of problem with cxx */
+  int4store(buf,4); // tell slave to skip magic number
+  int4store(buf+4,0);
   packet->append(buf, ROTATE_HEADER_LEN);
   packet->append(p,ident_len);
   if (my_net_write(net, (char*)packet->ptr(), packet->length()))
@@ -1041,26 +1043,26 @@ static Slave_log_event* find_slave_event(IO_CACHE* log,
   Log_event* ev;
   if (!(ev = Log_event::read_log_event(log, 0)))
   {
-    my_vsnprintf(errmsg, SLAVE_ERRMSG_SIZE,
-		 "Error reading start event in log '%s'",
-		 (char*)log_file_name);
+    my_snprintf(errmsg, SLAVE_ERRMSG_SIZE,
+		"Error reading start event in log '%s'",
+		(char*)log_file_name);
     return 0;
   }
   delete ev;
 
   if (!(ev = Log_event::read_log_event(log, 0)))
   {
-    my_vsnprintf(errmsg, SLAVE_ERRMSG_SIZE,
-		 "Error reading slave event in log '%s'",
-		 (char*)log_file_name);
+    my_snprintf(errmsg, SLAVE_ERRMSG_SIZE,
+		"Error reading slave event in log '%s'",
+		(char*)log_file_name);
     return 0;
   }
 
   if (ev->get_type_code() != SLAVE_EVENT)
   {
-    my_vsnprintf(errmsg, SLAVE_ERRMSG_SIZE,
-		 "Second event in log '%s' is not slave event",
-		 (char*)log_file_name);
+    my_snprintf(errmsg, SLAVE_ERRMSG_SIZE,
+		"Second event in log '%s' is not slave event",
+		(char*)log_file_name);
     delete ev;
     return 0;
   }

sql/sql_select.cc

@@ -143,6 +143,34 @@ static void select_describe(JOIN *join, bool need_tmp_table, bool need_order,
 			    bool distinct);
 static void describe_info(THD *thd, const char *info);
 
+/*
+  This handles SELECT with and without UNION
+*/
+
+int handle_select(THD *thd, LEX *lex, select_result *result)
+{
+  int res;
+  register SELECT_LEX *select_lex = &lex->select_lex;
+  if (select_lex->next)
+    res=mysql_union(thd,lex,result);
+  else
+    res=mysql_select(thd,(TABLE_LIST*) select_lex->table_list.first,
+		     select_lex->item_list,
+		     select_lex->where,
+		     select_lex->ftfunc_list,
+		     (ORDER*) select_lex->order_list.first,
+		     (ORDER*) select_lex->group_list.first,
+		     select_lex->having,
+		     (ORDER*) lex->proc_list.first,
+		     select_lex->options | thd->options,
+		     result);
+  if (res && result)
+    result->abort();
+  delete result;
+  return res;
+}
+
+
 /*****************************************************************************
 ** check fields, find best join, do the select and output fields.
 ** mysql_select assumes that all tables are allready opened
@@ -2985,7 +3013,9 @@ propagate_cond_constants(I_List<COND_CMP> *save_list,COND *and_level,
       Item_func_eq *func=(Item_func_eq*) cond;
       bool left_const= func->arguments()[0]->const_item();
       bool right_const=func->arguments()[1]->const_item();
-      if (!(left_const && right_const))
+      if (!(left_const && right_const) &&
+	  (func->arguments()[0]->result_type() ==
+	   (func->arguments()[1]->result_type())))
       {
 	if (right_const)
 	{

sql/sql_show.cc

@@ -993,10 +993,13 @@ void mysqld_list_processes(THD *thd,const char *user, bool verbose)
         thread_info *thd_info=new thread_info;
 
         thd_info->thread_id=tmp->thread_id;
-        thd_info->user=thd->strdup(tmp->user ? tmp->user : (tmp->system_thread ?
-                                  "system user" : "unauthenticated user"));
-        thd_info->host=thd->strdup(tmp->host ? tmp->host : (tmp->ip ? tmp->ip :
-                                   (tmp->system_thread ? "none" : "connecting host")));
+        thd_info->user=thd->strdup(tmp->user ? tmp->user :
+				   (tmp->system_thread ?
+				    "system user" : "unauthenticated user"));
+        thd_info->host=thd->strdup(tmp->host ? tmp->host :
+				   (tmp->ip ? tmp->ip :
+				    (tmp->system_thread ? "none" :
+				     "connecting host")));
         if ((thd_info->db=tmp->db))             // Safe test
           thd_info->db=thd->strdup(thd_info->db);
         thd_info->command=(int) tmp->command;

sql/sql_union.cc

@@ -25,21 +25,34 @@
 #include "sql_select.h"
 
 
-int mysql_union(THD *thd, LEX *lex,select_result *create_insert=(select_result *)NULL)
+int mysql_union(THD *thd, LEX *lex,select_result *result)
 {
   SELECT_LEX *sl, *last_sl;
   ORDER *order;
   List<Item> item_list;
-/*  TABLE_LIST *s=(TABLE_LIST*) lex->select_lex.table_list.first; */
   TABLE *table;
   TABLE_LIST *first_table, result_table_list;
   TMP_TABLE_PARAM tmp_table_param;
-  select_result *result;
   select_union *union_result;
   int res;
   uint elements;
   DBUG_ENTER("mysql_union");
 
+  if (lex->select_lex.options & SELECT_DESCRIBE)
+  {
+    my_error(ER_WRONG_USAGE,MYF(0),"DESCRIBE","UNION");
+    return -1;
+  } 
+
+  /* Fix tables--to-be-unioned-from list to point at opened tables */
+  for (sl=&lex->select_lex; sl; sl=sl->next)
+  {
+    for (TABLE_LIST *cursor= (TABLE_LIST *)sl->table_list.first;
+	 cursor;
+	 cursor=cursor->next)
+      cursor->table= ((TABLE_LIST*) cursor->table)->table;
+  }
+
   /* Find last select part as it's here ORDER BY and GROUP BY is stored */
   elements= lex->select_lex.item_list.elements;
   for (last_sl= &lex->select_lex;
@@ -60,7 +73,6 @@ int mysql_union(THD *thd, LEX *lex,select_result *create_insert=(select_result *
 
     /* Create a list of items that will be in the result set */
     first_table= (TABLE_LIST*) lex->select_lex.table_list.first;
-		if (create_insert) first_table=first_table->next;
     while ((item= it++))
       if (item_list.push_back(item))
 	DBUG_RETURN(-1);
@@ -96,8 +108,7 @@ int mysql_union(THD *thd, LEX *lex,select_result *create_insert=(select_result *
     if (thd->select_limit == HA_POS_ERROR)
       sl->options&= ~OPTION_FOUND_ROWS;
 
-    res=mysql_select(thd,(sl == &lex->select_lex) ? first_table : 
-				 (TABLE_LIST*) sl->table_list.first,
+    res=mysql_select(thd, (TABLE_LIST*) sl->table_list.first,
 		     sl->item_list,
 		     sl->where,
 		     sl->ftfunc_list,
@@ -116,19 +127,9 @@ int mysql_union(THD *thd, LEX *lex,select_result *create_insert=(select_result *
     goto exit;
   }
   delete union_result;
-	if (create_insert)
-		result=create_insert;
-  else if (lex->exchange)
-  {
-    if (lex->exchange->dumpfile)
-      result=new select_dump(lex->exchange);
-    else
-      result=new select_export(lex->exchange);
-  }
-  else
-    result=new select_send();
+
+  /* Send result to 'result' */
   res =-1;
-  if (result)
   {
     /* Create a list of fields in the temporary table */
     List_iterator<Item> it(item_list);
@@ -146,9 +147,6 @@ int mysql_union(THD *thd, LEX *lex,select_result *create_insert=(select_result *
 		       item_list, NULL, ftfunc_list, order,
 		       (ORDER*) NULL, NULL, (ORDER*) NULL,
 		       thd->options, result);
-    if (res)
-      result->abort();
-    delete result;
   }
 
 exit:

sql/sql_yacc.yy

@@ -1317,11 +1317,16 @@ table_to_table:
 
 select:
 	SELECT_SYM
+	{
+	  Lex->sql_command= SQLCOM_SELECT;
+	}
+	select_part2;
+
+select_part2:
 	{
 	  LEX *lex=Lex;
-	  if (lex->sql_command == SQLCOM_NONE) lex->sql_command= SQLCOM_SELECT;
 	  lex->lock_option=TL_READ;
-	  mysql_init_select(lex);
+	   mysql_init_select(lex);
 	}
 	select_options select_item_list select_into select_lock_type union
 
@@ -2504,7 +2509,7 @@ describe:
 	    YYABORT;
 	}
 	opt_describe_column
-	| describe_command select { Select->options|= SELECT_DESCRIBE };
+	| describe_command select { Lex->select_lex.options|= SELECT_DESCRIBE };
 
 
 describe_command:
@@ -3416,13 +3421,7 @@ union_list:
     mysql_new_select(lex);
     lex->select->linkage=UNION_TYPE;
   } 
-  select
-  {
-		LEX *lex=Lex;			
-    if (lex->sql_command == SQLCOM_SELECT)
-			lex->sql_command=SQLCOM_UNION_SELECT;
-  }
-
+  SELECT_SYM select_part2
 
 union_option:
   /* empty */ {}