Merge mysql.com:/home/svoj/devel/mysql/merge/mysql-4.1-engines

into  mysql.com:/home/svoj/devel/mysql/merge/mysql-5.0-engines

myisammrg/myrg_open.c

@@ -89,7 +89,10 @@ MYRG_INFO *myrg_open(const char *name, int mode, int handle_locking)
     else
       fn_format(buff, buff, "", "", 0);
     if (!(isam=mi_open(buff,mode,(handle_locking?HA_OPEN_WAIT_IF_LOCKED:0))))
+    {
+      my_errno= HA_ERR_WRONG_MRG_TABLE_DEF;
       goto err;
+    }
     if (!m_info)                                /* First file */
     {
       key_parts=isam->s->base.key_parts;

mysql-test/r/merge.result

@@ -178,9 +178,9 @@ t3	CREATE TABLE `t3` (
 ) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1 UNION=(`t1`,`t2`)
 create table t4 (a int not null, b char(10), key(a)) engine=MERGE UNION=(t1,t2);
 select * from t4;
-ERROR HY000: All tables in the MERGE table are not identically defined
+ERROR HY000: Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exists
 alter table t4 add column c int;
-ERROR HY000: All tables in the MERGE table are not identically defined
+ERROR HY000: Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exists
 create database mysqltest;
 create table mysqltest.t6 (a int not null primary key auto_increment, message char(20));
 create table t5 (a int not null, b char(20), key(a)) engine=MERGE UNION=(test.t1,mysqltest.t6);
@@ -785,4 +785,13 @@ insert into t1 values (1);
 ERROR HY000: Table 't1' is read only
 drop table t2;
 drop table t1;
+CREATE TABLE t1(a INT) ENGINE=MEMORY;
+CREATE TABLE t2(a INT) ENGINE=MERGE UNION=(t1);
+SELECT * FROM t2;
+ERROR HY000: Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exists
+DROP TABLE t1, t2;
+CREATE TABLE t2(a INT) ENGINE=MERGE UNION=(t3);
+SELECT * FROM t2;
+ERROR HY000: Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exists
+DROP TABLE t2;
 End of 5.0 tests

mysql-test/t/merge.test

@@ -378,6 +378,20 @@ select * from t3;
 check table t1, t2;
 drop table t1, t2, t3;
 
+#
+# BUG#10974 - No error message if merge table based on union of innodb,
+# memory
+#
+CREATE TABLE t1(a INT) ENGINE=MEMORY;
+CREATE TABLE t2(a INT) ENGINE=MERGE UNION=(t1);
+--error 1168
+SELECT * FROM t2;
+DROP TABLE t1, t2;
+CREATE TABLE t2(a INT) ENGINE=MERGE UNION=(t3);
+--error 1168
+SELECT * FROM t2;
+DROP TABLE t2;
+
 # End of 4.1 tests
 
 #