Revoking patch for Bug#10952 on behalf of Brian.

mysql-test/r/blackhole.result

@@ -123,11 +123,3 @@ master-bin.000001	#	Query	1	#	use `test`; create table t3 like t1
 master-bin.000001	#	Query	1	#	use `test`; insert into t1 select * from t3
 master-bin.000001	#	Query	1	#	use `test`; replace into t1 select * from t3
 drop table t1,t2,t3;
-drop table if exists t1;
-Warnings:
-Note	1051	Unknown table 't1'
-create table t1 (c char(20)) engine=MyISAM;
-insert into t1 values ("Monty"),("WAX"),("Walrus");
-alter table t1 engine=blackhole;
-ERROR HY000: Table storage engine for 't1' doesn't have this option
-drop table t1;

mysql-test/r/merge.result

@@ -768,14 +768,6 @@ Table	Op	Msg_type	Msg_text
 test.t1	check	status	OK
 test.t2	check	status	OK
 drop table t1, t2, t3;
-drop table if exists t1;
-Warnings:
-Note	1051	Unknown table 't1'
-create table t1 (c char(20)) engine=MyISAM;
-insert into t1 values ("Monty"),("WAX"),("Walrus");
-alter table t1 engine=MERGE;
-ERROR HY000: Table storage engine for 't1' doesn't have this option
-drop table t1;
 create table t1 (b bit(1));
 create table t2 (b bit(1));
 create table tm (b bit(1)) engine = merge union = (t1,t2);

mysql-test/t/blackhole.test

@@ -128,15 +128,3 @@ show binlog events;
 drop table t1,t2,t3;
 
 # End of 4.1 tests
-
-#
-# BUG#10952 - alter table ... lost data without errors and warnings
-#
-drop table if exists t1;
-create table t1 (c char(20)) engine=MyISAM;
-insert into t1 values ("Monty"),("WAX"),("Walrus");
---error 1031
-alter table t1 engine=blackhole;
-drop table t1;
-
-# End of 5.0 tests

mysql-test/t/merge.test

@@ -380,16 +380,6 @@ drop table t1, t2, t3;
 
 # End of 4.1 tests
 
-#
-# BUG#10952 - alter table ... lost data without errors and warnings
-#
-drop table if exists t1;
-create table t1 (c char(20)) engine=MyISAM;
-insert into t1 values ("Monty"),("WAX"),("Walrus");
---error 1031
-alter table t1 engine=MERGE;
-drop table t1;
-
 #
 # BUG#19648 - Merge table does not work with bit types
 #

sql/ha_blackhole.cc

@@ -47,7 +47,7 @@ handlerton blackhole_hton= {
   NULL,    /* create_cursor_read_view */
   NULL,    /* set_cursor_read_view */
   NULL,    /* close_cursor_read_view */
-  HTON_CAN_RECREATE | HTON_ALTER_CANNOT_CREATE
+  HTON_CAN_RECREATE
 };
 
 /*****************************************************************************

sql/ha_myisammrg.cc

@@ -55,7 +55,7 @@ handlerton myisammrg_hton= {
   NULL,    /* create_cursor_read_view */
   NULL,    /* set_cursor_read_view */
   NULL,    /* close_cursor_read_view */
-  HTON_CAN_RECREATE | HTON_ALTER_CANNOT_CREATE
+  HTON_CAN_RECREATE
 };
 
 

sql/handler.h

@@ -410,7 +410,6 @@ struct show_table_alias_st {
 #define HTON_ALTER_NOT_SUPPORTED     (1 << 1) //Engine does not support alter
 #define HTON_CAN_RECREATE            (1 << 2) //Delete all is used fro truncate
 #define HTON_HIDDEN                  (1 << 3) //Engine does not appear in lists
-#define HTON_ALTER_CANNOT_CREATE     (1 << 4) //Cannot use alter to create
 
 typedef struct st_thd_trans
 {

sql/sql_table.cc

@@ -3240,9 +3240,7 @@ bool mysql_alter_table(THD *thd,char *new_db, char *new_name,
 
   DBUG_PRINT("info", ("old type: %d  new type: %d", old_db_type, new_db_type));
   if (ha_check_storage_engine_flag(old_db_type, HTON_ALTER_NOT_SUPPORTED) ||
-      ha_check_storage_engine_flag(new_db_type, HTON_ALTER_NOT_SUPPORTED) ||
-      (old_db_type != new_db_type &&
-       ha_check_storage_engine_flag(new_db_type, HTON_ALTER_CANNOT_CREATE)))
+      ha_check_storage_engine_flag(new_db_type, HTON_ALTER_NOT_SUPPORTED))
   {
     DBUG_PRINT("info", ("doesn't support alter"));
     my_error(ER_ILLEGAL_HA, MYF(0), table_name);