fixed do with subselects

mysql-test/r/subselect.result:
  test of DO with subselects
mysql-test/t/subselect.test:
  test of DO with subselects

mysql-test/r/subselect.result

@@ -841,4 +841,13 @@ ROW(1, 1, 'a') IN (select b,a,c from t where c='b' or c='a')
 1
 select ROW(1, 1, 'a') IN (select b,a,c from t limit 2);
 This version of MySQL doesn't yet support 'LIMIT & IN/ALL/ANY/SOME subquery'
-drop table if exists t;
+drop table t;
+create table t (a int);
+insert into t values (1);
+do @a:=(SELECT a from t);
+select @a;
+@a
+1
+drop table t;
+do (SELECT a from t);
+Table 'test.t' doesn't exist

mysql-test/t/subselect.test

@@ -462,4 +462,12 @@ select ROW(1, 2, 'a') IN (select a,b,c from t where c='b' or c='a');
 select ROW(1, 1, 'a') IN (select b,a,c from t where c='b' or c='a');
 -- error 1235
 select ROW(1, 1, 'a') IN (select b,a,c from t limit 2);
-drop table if exists t;
+drop table t;
+
+create table t (a int);
+insert into t values (1);
+do @a:=(SELECT a from t);
+select @a;
+drop table t;
+-- error 1146
+do (SELECT a from t);

sql/sql_parse.cc

@@ -1598,7 +1598,14 @@ mysql_execute_command(THD *thd)
     break;
   }
   case SQLCOM_DO:
-    res=mysql_do(thd, *lex->insert_list);
+    if (tables && ((res= check_table_access(thd, SELECT_ACL, tables)) ||
+		   (res= open_and_lock_tables(thd,tables))))
+	break;
+
+    fix_tables_pointers(lex->all_selects_list);
+    res= mysql_do(thd, *lex->insert_list);
+    if (thd->net.report_error)
+      res= -1;
     break;
 
   case SQLCOM_EMPTY_QUERY: