Three bug fixes and one fix being undone.

mysql-test/r/innodb_handler.result:
  change of test case after Heikki's fix
sql/sql_db.cc:
  Adding suport for backquotes in change_db()
sql/sql_update.cc:
  Undoing a fix
strings/ctype-tis620.c:
  Fixing a crashing bug

mysql-test/r/innodb_handler.result

@@ -147,4 +147,5 @@ HANDLER t1 READ `primary` = (1, 1000);
 no1	no2
 HANDLER t1 READ `primary` PREV;
 no1	no2
+1	275
 DROP TABLE t1;

sql/sql_db.cc

@@ -351,6 +351,13 @@ bool mysql_change_db(THD *thd,const char *name)
     x_free(dbname);
     DBUG_RETURN(1);
   }
+  if (dbname[0] == '`' && dbname[db_length-1] == '`')
+  {
+    int counter=1;
+    for (; counter < db_length - 1; counter++)
+      dbname[counter-1]=dbname[counter];
+    dbname[(db_length= counter)-1]='\0';
+  }
   DBUG_PRINT("info",("Use database: %s", dbname));
   if (test_all_bits(thd->master_access,DB_ACLS))
     db_access=DB_ACLS;

sql/sql_update.cc

@@ -478,11 +478,6 @@ int multi_update::prepare(List<Item> &not_used_values)
       table->used_keys=0;
       table->pos_in_table_list= tl;
     }
-    else
-    {
-      table_ref->lock_type=TL_READ;
-      mysql_unlock_some_tables(thd,&table,1);
-    }
   }
 
 

strings/ctype-tis620.c

@@ -491,7 +491,7 @@ static uchar* thai2sortable(const uchar * tstr,uint len)
     return((uchar*) tstr);
   }
   pLeft4 = pRight4;*/
-  while(len--) {
+  while((len--)) {
     if(isldvowel(*p) && isconsnt(p[1])) {
       *pRight1++ = t_ctype[p[1]][0];
       *pRight2++ = t_ctype[p[1]][1];
@@ -501,7 +501,8 @@ static uchar* thai2sortable(const uchar * tstr,uint len)
       *pRight2++ = t_ctype[*p][1];
       *pRight3++ = t_ctype[*p][2];
 /*	*pRight4++ = t_ctype[*p][3]; */
-      len--;
+      if (!(len--))
+	break;
       p += 2;
     } else {
       *pRight1 = t_ctype[*p][0];