BUG#28248 - mysqldump results with MERGE ... UNION=() cannot be executed

After merge fix.

mysql-test/r/merge.result

@@ -969,21 +969,21 @@ CREATE TABLE m1(a INT) ENGINE=MERGE;
 SHOW CREATE TABLE m1;
 Table	Create Table
 m1	CREATE TABLE `m1` (
-  `a` int(11) default NULL
+  `a` int(11) DEFAULT NULL
 ) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1
 DROP TABLE m1;
 CREATE TABLE m1(a INT) ENGINE=MERGE UNION=();
 SHOW CREATE TABLE m1;
 Table	Create Table
 m1	CREATE TABLE `m1` (
-  `a` int(11) default NULL
+  `a` int(11) DEFAULT NULL
 ) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1
 ALTER TABLE m1 UNION=(t1);
 ALTER TABLE m1 UNION=();
 SHOW CREATE TABLE m1;
 Table	Create Table
 m1	CREATE TABLE `m1` (
-  `a` int(11) default NULL
+  `a` int(11) DEFAULT NULL
 ) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1
 DROP TABLE t1, m1;
 End of 5.0 tests
@@ -1151,7 +1151,7 @@ SHOW CREATE TABLE t4;
 Table	Create Table
 t4	CREATE TABLE `t4` (
   `c1` int(11) DEFAULT NULL
-) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1 UNION=()
+) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1
 INSERT INTO t4 VALUES (4);
 ERROR HY000: Table 't4' is read only
 DROP TABLE t4;
@@ -1168,7 +1168,7 @@ SHOW CREATE TABLE t4;
 Table	Create Table
 t4	CREATE TABLE `t4` (
   `c1` int(11) DEFAULT NULL
-) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1 UNION=()
+) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1
 INSERT INTO t4 VALUES (4);
 ERROR HY000: Table 't4' is read only
 DROP TABLE t4;

mysql-test/suite/rpl/r/rpl_row_create_table.result

@@ -45,7 +45,7 @@ Table	t2
 Create Table	CREATE TABLE `t2` (
   `a` int(11) DEFAULT NULL,
   `b` int(11) DEFAULT NULL
-) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1 UNION=()
+) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1
 SHOW CREATE TABLE t3;
 Table	t3
 Create Table	CREATE TABLE `t3` (
@@ -64,7 +64,7 @@ Table	t2
 Create Table	CREATE TABLE `t2` (
   `a` int(11) DEFAULT NULL,
   `b` int(11) DEFAULT NULL
-) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1 UNION=()
+) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1
 SHOW CREATE TABLE t3;
 Table	t3
 Create Table	CREATE TABLE `t3` (
@@ -185,7 +185,7 @@ Table	t8
 Create Table	CREATE TABLE `t8` (
   `a` int(11) DEFAULT NULL,
   `b` int(11) DEFAULT NULL
-) ENGINE=MRG_MyISAM DEFAULT CHARSET=utf8 UNION=()
+) ENGINE=MRG_MyISAM DEFAULT CHARSET=utf8
 SHOW CREATE TABLE t9;
 Table	t9
 Create Table	CREATE TABLE `t9` (
@@ -205,7 +205,7 @@ Table	t8
 Create Table	CREATE TABLE `t8` (
   `a` int(11) DEFAULT NULL,
   `b` int(11) DEFAULT NULL
-) ENGINE=MRG_MyISAM DEFAULT CHARSET=utf8 UNION=()
+) ENGINE=MRG_MyISAM DEFAULT CHARSET=utf8
 SHOW CREATE TABLE t9;
 Table	t9
 Create Table	CREATE TABLE `t9` (