Fix for #3067 (REPAIR TABLE reenables disabled keys)

myisam/mi_check.c:
  we only restore key_map if it's required
mysql-test/r/repair_part1.result:
  appropriate test result
mysql-test/t/repair_part1.test:
  test case

myisam/mi_check.c

@@ -1274,11 +1274,12 @@ int mi_repair(MI_CHECK *param, register MI_INFO *info,
     I think mi_repair and mi_repair_by_sort should do the same
     (according, e.g. to ha_myisam::repair), but as mi_repair doesn't
     touch key_map it cannot be used to T_CREATE_MISSING_KEYS.
-    That is what the next line is for... (serg)
+    That is what the next line is for
   */
 
-  share->state.key_map= ((((ulonglong) 1L << share->base.keys)-1) &
-			 param->keys_in_use);
+  if (param->testflag & T_CREATE_MISSING_KEYS)
+    share->state.key_map= ((((ulonglong) 1L << share->base.keys)-1) &
+			   param->keys_in_use);
 
   info->state->key_file_length=share->base.keystart;
 

mysql-test/r/repair_part1.result

@@ -9,6 +9,21 @@ repair table t1 use_frm;
 Table	Op	Msg_type	Msg_text
 test.t1	repair	error	The storage engine for the table doesn't support repair
 drop table t1;
+create table t1(id int PRIMARY KEY, st varchar(10), KEY st_key(st));
+insert into t1 values(1, "One");
+alter table t1 disable keys;
+show keys from t1;
+Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment
+t1	0	PRIMARY	1	id	A	1	NULL	NULL		BTREE	
+t1	1	st_key	1	st	A	NULL	NULL	NULL	YES	BTREE	disabled
+repair table t1 extended;
+Table	Op	Msg_type	Msg_text
+test.t1	repair	status	OK
+show keys from t1;
+Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment
+t1	0	PRIMARY	1	id	A	1	NULL	NULL		BTREE	
+t1	1	st_key	1	st	A	NULL	NULL	NULL	YES	BTREE	disabled
+drop table t1;
 repair table t1 use_frm;
 Table	Op	Msg_type	Msg_text
 test.t1	repair	error	Table 'test.t1' doesn't exist

mysql-test/t/repair_part1.test

@@ -12,6 +12,18 @@ alter table t1 ENGINE=HEAP;
 repair table t1 use_frm;
 drop table t1;
 
+#
+# disabled keys during repair
+#
+create table t1(id int PRIMARY KEY, st varchar(10), KEY st_key(st));
+insert into t1 values(1, "One");
+alter table t1 disable keys;
+show keys from t1;
+repair table t1 extended;
+show keys from t1;
+drop table t1;
+
+
 # non-existent table
 repair table t1 use_frm;