One test case, one bug fix and one new feature

mysql-test/r/innodb.result:
  A test case for non-functional rollback after inserting a row into
  MyISAM table with binary log enabled.
mysql-test/t/innodb.test:
  A test case for non-functional rollback after inserting a row into
  MyISAM table with binary log enabled.
sql/sql_show.cc:
  Displaying disabled keys in SHOW KEYS
sql/sql_table.cc:
  Fix for a serious bug with ALTER TABLE ENABLE / DISABLE KEYS

mysql-test/r/innodb.result

@@ -1201,3 +1201,12 @@ a	b
 8	5
 9	5
 drop table t1,t2;
+CREATE TABLE t2 (   NEXT_T         BIGINT NOT NULL PRIMARY KEY) TYPE=MyISAM;
+CREATE TABLE t1 (  B_ID           INTEGER NOT NULL PRIMARY KEY) TYPE=InnoDB;
+SET AUTOCOMMIT=0;
+INSERT INTO t1 ( B_ID ) VALUES ( 1 );
+INSERT INTO t2 ( NEXT_T ) VALUES ( 1 );
+ROLLBACK;
+SELECT * FROM t1;
+B_ID
+drop table  t1,t2;

mysql-test/t/innodb.test

@@ -797,3 +797,11 @@ select * from t1;
 select * from t2;
 
 drop table t1,t2;
+CREATE TABLE t2 (   NEXT_T         BIGINT NOT NULL PRIMARY KEY) TYPE=MyISAM;
+CREATE TABLE t1 (  B_ID           INTEGER NOT NULL PRIMARY KEY) TYPE=InnoDB;
+SET AUTOCOMMIT=0;
+INSERT INTO t1 ( B_ID ) VALUES ( 1 );
+INSERT INTO t2 ( NEXT_T ) VALUES ( 1 );
+ROLLBACK;
+SELECT * FROM t1;
+drop table  t1,t2;

sql/sql_show.cc

@@ -728,7 +728,10 @@ mysqld_show_keys(THD *thd, TABLE_LIST *table_list)
       net_store_data(packet,convert,(const char*) pos);
       net_store_data(packet,convert,table->file->index_type(i));
       /* Comment */
-      net_store_data(packet,convert,"");
+      if (!(table->keys_in_use & ((key_map) 1 << i)))
+	net_store_data(packet,convert,"disabled",8);
+      else
+	net_store_data(packet,convert,"");
       if (my_net_write(&thd->net,(char*) packet->ptr(),packet->length()))
         DBUG_RETURN(1); /* purecov: inspected */
     }

sql/sql_table.cc

@@ -912,12 +912,9 @@ mysql_rename_table(enum db_type base,
   Win32 clients must also have a WRITE LOCK on the table !
 */
 
-bool close_cached_table(THD *thd,TABLE *table)
+static void safe_remove_from_cache(THD *thd,TABLE *table)
 {
-  bool result=0;
-  DBUG_ENTER("close_cached_table");
-  safe_mutex_assert_owner(&LOCK_open);
-
+  DBUG_ENTER("safe_remove_from_cache");
   if (table)
   {
     DBUG_PRINT("enter",("table: %s", table->real_name));
@@ -940,7 +937,18 @@ bool close_cached_table(THD *thd,TABLE *table)
 #endif
     /* When lock on LOCK_open is freed other threads can continue */
     pthread_cond_broadcast(&COND_refresh);
+  }
+  DBUG_VOID_RETURN;
+}
+
+bool close_cached_table(THD *thd,TABLE *table)
+{
+  DBUG_ENTER("close_cached_table");
+  safe_mutex_assert_owner(&LOCK_open);
 
+  if (table)
+  {
+    safe_remove_from_cache(thd,table);
     /* Close lock if this is not got with LOCK TABLES */
     if (thd->lock)
     {
@@ -949,7 +957,7 @@ bool close_cached_table(THD *thd,TABLE *table)
     /* Close all copies of 'table'.  This also frees all LOCK TABLES lock */
     thd->open_tables=unlink_open_table(thd,thd->open_tables,table);
   }
-  DBUG_RETURN(result);
+  DBUG_RETURN(0);
 }
 
 static int send_check_errmsg(THD* thd, TABLE_LIST* table,
@@ -1456,9 +1464,11 @@ int mysql_alter_table(THD *thd,char *new_db, char *new_name,
       case LEAVE_AS_IS:
 	break;
       case ENABLE:
-	error=table->file->activate_all_index(thd);
+	safe_remove_from_cache(thd,table);
+	error=   table->file->activate_all_index(thd);
 	break;
       case DISABLE:
+	safe_remove_from_cache(thd,table);
 	table->file->deactivate_non_unique_index(HA_POS_ERROR);
 	break;
       }