Many fixes.

I still have to make a test case for :

UPDATE from sub-select with derived table

mysql-test/r/multi_update.result

@@ -235,4 +235,19 @@ select * from t2;
 n	d
 1	30
 1	30
+UPDATE t1 a ,t2 b SET t1.d=t2.d,t2.d=30 WHERE a.n=b.n;
+select * from t1;
+n	d
+1	30
+3	2
+select * from t2;
+n	d
+1	30
+1	30
+DELETE t1, t2  FROM t1 a,t2 b where a.n=b.n;
+select * from t1;
+n	d
+3	2
+select * from t2;
+n	d
 drop table t1,t2;

mysql-test/r/subselect.result

@@ -86,20 +86,20 @@ select * from t2 where t2.b=(select a from t3 order by 1 desc limit 1);
 a	b
 1	7
 2	7
-select * from t2 where t2.b=(select a from t3 order by 1 desc limit 1) 
+(select * from t2 where t2.b=(select a from t3 order by 1 desc limit 1))
 union (select * from t4 order by a limit 2) limit 3;
 a	b
 1	7
 2	7
 3	8
-select * from t2 where t2.b=(select a from t3 order by 1 desc limit 1)
+(select * from t2 where t2.b=(select a from t3 order by 1 desc limit 1))
 union (select * from t4 where t4.b=(select max(t2.a)*4 from t2) order by a);
 a	b
 1	7
 2	7
 3	8
 4	8
-explain select * from t2 where t2.b=(select a from t3 order by 1 desc limit 1) 
+explain (select * from t2 where t2.b=(select a from t3 order by 1 desc limit 1))
 union (select * from t4 where t4.b=(select max(t2.a)*4 from t2) order by a);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t2	ALL	NULL	NULL	NULL	NULL	2	Using where

mysql-test/t/multi_update.test

@@ -213,4 +213,10 @@ insert into t2 values(1,10),(1,20);
 UPDATE t1,t2 SET t1.d=t2.d,t2.d=30 WHERE t1.n=t2.n;
 select * from t1;
 select * from t2;
+UPDATE t1 a ,t2 b SET t1.d=t2.d,t2.d=30 WHERE a.n=b.n;
+select * from t1;
+select * from t2;
+DELETE t1, t2  FROM t1 a,t2 b where a.n=b.n;
+select * from t1;
+select * from t2;
 drop table t1,t2;

mysql-test/t/subselect.test

@@ -44,11 +44,11 @@ select (select a from t3), a from t2;
 select * from t2 where t2.a=(select a from t1);
 insert into t3 values (6),(7),(3);
 select * from t2 where t2.b=(select a from t3 order by 1 desc limit 1);
-select * from t2 where t2.b=(select a from t3 order by 1 desc limit 1) 
+(select * from t2 where t2.b=(select a from t3 order by 1 desc limit 1))
 union (select * from t4 order by a limit 2) limit 3;
-select * from t2 where t2.b=(select a from t3 order by 1 desc limit 1)
+(select * from t2 where t2.b=(select a from t3 order by 1 desc limit 1))
 union (select * from t4 where t4.b=(select max(t2.a)*4 from t2) order by a);
-explain select * from t2 where t2.b=(select a from t3 order by 1 desc limit 1) 
+explain (select * from t2 where t2.b=(select a from t3 order by 1 desc limit 1))
 union (select * from t4 where t4.b=(select max(t2.a)*4 from t2) order by a);
 select (select a from t3 where a<t2.a*4 order by 1 desc limit 1), a from t2;
 select (select t3.a from t3 where a<8 order by 1 desc limit 1), a from 

sql/sql_cache.cc

@@ -1062,6 +1062,8 @@ void Query_cache::invalidate(THD *thd, TABLE_LIST *tables_used,
       for (; tables_used; tables_used=tables_used->next)
       {
 	DBUG_ASSERT(!using_transactions || tables_used->table!=0);
+	if (tables_used->derived)
+	  continue;
 	if (using_transactions && 
 	   tables_used->table->file->has_transactions())
 	  /* 

sql/sql_derived.cc

@@ -168,14 +168,9 @@ int mysql_derived(THD *thd, LEX *lex, SELECT_LEX_UNIT *unit, TABLE_LIST *t)
 	      tables->table_list->table=tables->table; // to fix a problem in EXPLAIN
 	  }
 	  else
-	  {
-	    if (is_union)
-	      unit->exclude();
-	    else
-	      sl->exclude();
-	  }
+	    unit->exclude();
 	  t->db=(char *)"";
-	  t->derived=(SELECT_LEX *)0; // just in case ...
+	  t->derived=(SELECT_LEX *)1; // just in case ...
 	  table->file->info(HA_STATUS_VARIABLE);
 	}
       }

sql/sql_parse.cc

@@ -3001,6 +3001,7 @@ mysql_init_query(THD *thd)
   lex->select_lex.link_prev= (st_select_lex_node**)&(lex->all_selects_list);
   lex->olap=lex->describe=0;
   lex->derived_tables= false;
+  lex->lock_option=TL_UNLOCK;
   thd->check_loops_counter= thd->select_number=
     lex->select_lex.select_number= 1;
   thd->free_list= 0;

sql/sql_show.cc

@@ -1469,7 +1469,7 @@ int mysqld_show(THD *thd, const char *wild, show_var_st *variables,
 	end= int10_to_str((long) thd->query_id, buff, 10);
         break;
       case SHOW_RPL_STATUS:
-	end= int10_to_str((long) rpl_status_type[(int)rpl_status], buff, 10);
+	end= strmov(buff, rpl_status_type[(int)rpl_status]);
 	break;
       case SHOW_SLAVE_RUNNING:
       {

sql/sql_yacc.yy

@@ -1668,12 +1668,17 @@ select_init:
 	'(' SELECT_SYM select_part2 ')'
 	  {
 	    LEX *lex= Lex;
-            SELECT_LEX_NODE * sel= lex->current_select;
+            SELECT_LEX * sel= lex->current_select->select_lex();
 	    if (sel->set_braces(1))
 	    {
 	      send_error(lex->thd, ER_SYNTAX_ERROR);
 	      YYABORT;
 	    }
+	  if (sel->linkage == UNION_TYPE && !sel->master_unit()->first_select()->braces)
+	  {
+	    send_error(lex->thd, ER_SYNTAX_ERROR);
+	    YYABORT;
+	  }
             /* select in braces, can't contain global parameters */
             sel->master_unit()->global_parameters=
                sel->master_unit();
@@ -1683,11 +1688,17 @@ select_init2:
 	select_part2
         {
 	  LEX *lex= Lex;
+          SELECT_LEX * sel= lex->current_select->select_lex();
           if (lex->current_select->set_braces(0))
 	  {
 	    send_error(lex->thd, ER_SYNTAX_ERROR);
 	    YYABORT;
 	  }
+	  if (sel->linkage == UNION_TYPE && sel->master_unit()->first_select()->braces)
+	  {
+	    send_error(lex->thd, ER_SYNTAX_ERROR);
+	    YYABORT;
+	  }
 	}
 	union_clause
 	;
@@ -1695,6 +1706,7 @@ select_init2:
 select_part2:
 	{
 	  LEX *lex=Lex;
+	  SELECT_LEX * sel= lex->current_select->select_lex();
 	  if (lex->current_select == &lex->select_lex)
 	    lex->lock_option= TL_READ; /* Only for global SELECT */
 	  mysql_init_select(lex);
@@ -2509,7 +2521,9 @@ join_table:
 	  lex->current_select= unit->outer_select();
 	  if (!($$= lex->current_select->
                 add_table_to_list(lex->thd, new Table_ident(unit), $5, 0,
-				  lex->lock_option)))
+				  lex->lock_option,(List<String> *)0,
+	                          (List<String> *)0)))
+
 	    YYABORT;
 	};
 
@@ -3187,16 +3201,16 @@ table_wild_list:
 	  | table_wild_list ',' table_wild_one {};
 
 table_wild_one:
-	ident opt_wild
+	ident opt_wild opt_table_alias
 	{
-	  if (!Select->add_table_to_list(YYTHD, new Table_ident($1), NULL, 1,
+	  if (!Select->add_table_to_list(YYTHD, new Table_ident($1), $3, 1,
 	      Lex->lock_option))
 	    YYABORT;
         }
-	| ident '.' ident opt_wild
+	| ident '.' ident opt_wild opt_table_alias
 	  {
 	    if (!Select->add_table_to_list(YYTHD, new Table_ident($1, $3, 0),
-					   NULL, 1, Lex->lock_option))
+					   $5, 1, Lex->lock_option))
 	      YYABORT;
 	  }
 	;