Test of optimize table.

Docs/manual.texi:
  Updated changelog.
  Update info about MERGE tables.
  Moved section 'Why so many open tables'
mysql-test/r/create.result:
  Added test of types in CREATE
mysql-test/t/create.test:
  Added test of types in CREATE
sql/item_func.cc:
  More different values for RAND(nr) and RAND(nr+1)

mysql-test/r/create.result

@@ -68,3 +68,12 @@ select * from t2 where b="world";
 a	B
 3	world
 drop table t1,t2;
+create table t1(x varchar(50) );
+create table t2 select x from t1 where 1=2;
+describe t1;
+Field	Type	Null	Key	Default	Extra
+x	varchar(50)	YES		NULL	
+describe t2;
+Field	Type	Null	Key	Default	Extra
+x	char(50)	YES		NULL	
+drop table t1,t2;

mysql-test/r/myisam.result

@@ -31,3 +31,20 @@ check table t1;
 Table	Op	Msg_type	Msg_text
 test.t1	check	status	OK
 drop table t1;
+create table t1 (a int not null auto_increment, b int not null, primary key (a), index(b));
+insert into t1 (b) values (1),(2),(2),(2),(2);
+optimize table t1;
+Table	Op	Msg_type	Msg_text
+test.t1	optimize	status	OK
+show index from t1;
+Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Comment
+t1	0	PRIMARY	1	a	A	5	NULL	NULL	
+t1	1	b	1	b	A	1	NULL	NULL	
+optimize table t1;
+Table	Op	Msg_type	Msg_text
+test.t1	optimize	status	Table is already up to date
+show index from t1;
+Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Comment
+t1	0	PRIMARY	1	a	A	5	NULL	NULL	
+t1	1	b	1	b	A	1	NULL	NULL	
+drop table t1;

mysql-test/t/create.test

@@ -65,3 +65,13 @@ create table t2 (key (b)) select * from t1;
 explain select * from t2 where b="world";
 select * from t2 where b="world";
 drop table t1,t2;
+
+#
+# Test types after CREATE ... SELECT
+#
+
+create table t1(x varchar(50) );
+create table t2 select x from t1 where 1=2;
+describe t1;
+describe t2;
+drop table t1,t2;

sql/item_func.cc

@@ -621,8 +621,8 @@ double Item_func_rand::val()
 {
   if (arg_count)
   {					// Only use argument once in query
-    ulong tmp=((ulong) args[0]->val_int())+55555555L;
-    randominit(&current_thd->rand,tmp,tmp/2);
+    ulong tmp=((ulong) args[0]->val_int());
+    randominit(&current_thd->rand,tmp*0x10001L+55555555L,tmp*0x10000001L);
 #ifdef DELETE_ITEMS
     delete args[0];
 #endif