fixed st_select_lex initialization

fixed mustiupdate subselect compatibility

(bug 217)



mysql-test/r/subselect.result:
  test of multi-update & subselect
mysql-test/t/subselect.test:
  test of multi-update & subselect
sql/sql_update.cc:
  added subselect compatibility to query cache
sql/sql_yacc.yy:
  right st_select_lex initialization 
  layout fix

mysql-test/r/subselect.result

@@ -1082,3 +1082,20 @@ Invalid use of group function
 UPDATE t1 SET i=i+1 WHERE i=(SELECT MAX(i));
 Invalid use of group function
 drop table t1;
+CREATE TABLE t1 (
+id int(11) default NULL
+) TYPE=MyISAM CHARSET=latin1;
+INSERT INTO t1 VALUES (1),(1),(2),(2),(1),(3);
+CREATE TABLE t2 (
+id int(11) default NULL,
+name varchar(15) default NULL
+) TYPE=MyISAM CHARSET=latin1;
+INSERT INTO t2 VALUES (4,'vita'), (1,'vita'), (2,'vita'), (1,'vita');
+update t1, t2 set t2.name='lenka' where t2.id in (select id from t1);
+select * from t2;
+id	name
+4	vita
+1	lenka
+2	lenka
+1	lenka
+drop table t1,t2;

mysql-test/t/subselect.test

@@ -673,3 +673,20 @@ UPDATE t1 SET i=i+(SELECT MAX(i) FROM (SELECT 1) t) WHERE i=(SELECT MAX(i));
 -- error 1111
 UPDATE t1 SET i=i+1 WHERE i=(SELECT MAX(i));
 drop table t1;
+
+#
+# Multi update test
+#
+CREATE TABLE t1 (
+  id int(11) default NULL
+) TYPE=MyISAM CHARSET=latin1;
+INSERT INTO t1 VALUES (1),(1),(2),(2),(1),(3);
+CREATE TABLE t2 (
+  id int(11) default NULL,
+  name varchar(15) default NULL
+) TYPE=MyISAM CHARSET=latin1;
+
+INSERT INTO t2 VALUES (4,'vita'), (1,'vita'), (2,'vita'), (1,'vita');
+update t1, t2 set t2.name='lenka' where t2.id in (select id from t1);
+select * from t2;
+drop table t1,t2;

sql/sql_update.cc

@@ -400,6 +400,7 @@ int mysql_multi_update(THD *thd,
   table_list->grant.want_privilege=(SELECT_ACL & ~table_list->grant.privilege);
   if ((res=open_and_lock_tables(thd,table_list)))
     DBUG_RETURN(res);
+  fix_tables_pointers(thd->lex.all_selects_list);
 
   thd->select_limit=HA_POS_ERROR;
   if (setup_fields(thd, 0, table_list, *fields, 1, 0, 0))
@@ -408,7 +409,7 @@ int mysql_multi_update(THD *thd,
   /*
     Count tables and setup timestamp handling
   */
-  for (tl= (TABLE_LIST*) table_list ; tl ; tl=tl->next)
+  for (tl= select_lex->get_table_list() ; tl ; tl=tl->next)
   {
     TABLE *table= tl->table;
     if (table->timestamp_field)
@@ -426,7 +427,8 @@ int mysql_multi_update(THD *thd,
 
   List<Item> total_list;
   res= mysql_select(thd, &select_lex->ref_pointer_array,
-		    table_list, select_lex->with_wild, total_list,
+		    select_lex->get_table_list(), select_lex->with_wild,
+		    total_list,
 		    conds, 0, (ORDER *) NULL, (ORDER *)NULL, (Item *) NULL,
 		    (ORDER *)NULL,
 		    options | SELECT_NO_JOIN_CACHE | SELECT_NO_UNLOCK,

sql/sql_yacc.yy

@@ -3369,8 +3369,8 @@ update:
 	UPDATE_SYM
 	{
 	  LEX *lex= Lex;
+	  mysql_init_select(lex);
           lex->sql_command= SQLCOM_UPDATE;
-          lex->select_lex.init_order();
         }
         opt_low_priority opt_ignore join_table_list
 	SET update_list where_clause opt_order_clause delete_limit_clause
@@ -3378,7 +3378,7 @@ update:
 	  LEX *lex= Lex;
 	  Select->set_lock_for_tables($3);
           if (lex->select_lex.table_list.elements > 1)
-            lex->sql_command=SQLCOM_UPDATE_MULTI;
+            lex->sql_command= SQLCOM_UPDATE_MULTI;
 	}
 	;