Added test cases for preceding test

This includes all test changes from
"Changing all cost calculation to be given in milliseconds"
and forwards.

Some of the things that caused changes in the result files:

- As part of fixing tests, I added 'echo' to some comments to be able to
  easier find out where things where wrong.
- MATERIALIZED has now a higher cost compared to X than before. Because
  of this some MATERIALIZED types have changed to DEPENDEND SUBQUERY.
  - Some test cases that required MATERIALIZED to repeat a bug was
    changed by adding more rows to force MATERIALIZED to happen.
- 'Filtered' in SHOW EXPLAIN has in many case changed from 100.00 to
  something smaller. This is because now filtered also takes into
  account the smallest possible ref access and filters, even if they
  where not used. Another reason for 'Filtered' being smaller is that
  we now also take into account implicit filtering done for subqueries
  using FIRSTMATCH.
  (main.subselect_no_exists_to_in)
  This is caluculated in best_access_path() and stored in records_out.
- Table orders has changed because more accurate costs.
- 'index' and 'ALL' for small tables has changed to use 'range' or
   'ref' because of optimizer_scan_setup_cost.
- index can be changed to 'range' as 'range' optimizer assumes we don't
  have to read the blocks from disk that range optimizer has already read.
  This can be confusing in the case where there is no obvious where clause
  but instead there is a hidden 'key_column > NULL' added by the optimizer.
  (main.subselect_no_exists_to_in)
- Scan on primary clustered key does not report 'Using Index' anymore
  (It's a table scan, not an index scan).
- For derived tables, the number of rows is now 100 instead of 2,
  which can be seen in EXPLAIN.
- More tests have "Using index for group by" as the cost of this
  optimization is now more correct (lower).
- A primary key could be preferred for a normal key, even if it would
  access more rows, as it's faster to do 1 lokoup and 3 'index_next' on a
  clustered primary key than one lookup trough a secondary.
  (main.stat_tables_innodb)

Notes:

- There was a 4.7% more calls to best_extension_by_limited_search() in
  the main.greedy_optimizer test.  However examining the test results
  it looked that the plans where slightly better (eq_ref where more
  chained together) so I assume this is ok.
- I have verified a few test cases where there was notable/unexpected
  changes in the plan and in all cases the new optimizer plans where
  faster.  (main.greedy_optimizer and some others)

mysql-test/main/ssl_compress.result

@@ -6,6 +6,7 @@ SHOW STATUS LIKE 'Compression';
 Variable_name	Value
 Compression	ON
 drop table if exists t1,t2,t3,t4;
+set @@default_storage_engine="aria";
 CREATE TABLE t1 (
 Period smallint(4) unsigned zerofill DEFAULT '0000' NOT NULL,
 Varor_period smallint(4) unsigned DEFAULT '0' NOT NULL
@@ -606,6 +607,9 @@ explain select t3.t2nr,fld3 from t2,t3 where t2.companynr = 34 and t2.fld1=t3.t2
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	ALL	fld1	NULL	NULL	NULL	1199	Using where; Using temporary; Using filesort
 1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t2.fld1	1	Using where; Using index
+#
+# Some test with ORDER BY and limit
+#
 explain select * from t3 as t1,t3 where t1.period=t3.period order by t3.period;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	period	NULL	NULL	NULL	41810	Using filesort
@@ -1295,7 +1299,7 @@ companynr tinyint(2) unsigned zerofill NOT NULL default '00',
 companyname char(30) NOT NULL default '',
 PRIMARY KEY (companynr),
 UNIQUE KEY companyname(companyname)
-) ENGINE=MyISAM MAX_ROWS=50 PACK_KEYS=1 COMMENT='companynames';
+) ENGINE=aria MAX_ROWS=50 PACK_KEYS=1 COMMENT='companynames';
 select STRAIGHT_JOIN t2.companynr,companyname from t4,t2 where t2.companynr=t4.companynr group by t2.companynr;
 companynr	companyname
 00	Unknown
@@ -1385,6 +1389,9 @@ explain select companynr,companyname from t4 left join t2 using (companynr) wher
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE
 delete from t2 where fld1=999999;
+#
+# Test left join optimization
+#
 explain select t2.companynr,companyname from t4 left join t2 using (companynr) where t2.companynr > 0;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1199	Using where
@@ -1399,15 +1406,15 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t4	eq_ref	PRIMARY	PRIMARY	1	test.t2.companynr	1	
 explain select companynr,companyname from t4 left join t2 using (companynr) where companynr > 0;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t4	ALL	PRIMARY	NULL	NULL	NULL	12	Using where
+1	SIMPLE	t4	range	PRIMARY	PRIMARY	1	NULL	12	Using index condition
 1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1199	Using where
 explain select companynr,companyname from t4 left join t2 using (companynr) where companynr > 0 or companynr < 0;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t4	ALL	PRIMARY	NULL	NULL	NULL	12	Using where
+1	SIMPLE	t4	range	PRIMARY	PRIMARY	1	NULL	12	Using index condition
 1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1199	Using where
 explain select companynr,companyname from t4 left join t2 using (companynr) where companynr > 0 and companynr > 0;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t4	ALL	PRIMARY	NULL	NULL	NULL	12	Using where
+1	SIMPLE	t4	range	PRIMARY	PRIMARY	1	NULL	12	Using index condition
 1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1199	Using where
 explain select t2.companynr,companyname from t4 left join t2 using (companynr) where t2.companynr > 0 or t2.companynr is null;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
@@ -1423,11 +1430,11 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1199	Using where
 explain select companynr,companyname from t4 left join t2 using (companynr) where companynr > 0 or companynr is null;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t4	ALL	PRIMARY	NULL	NULL	NULL	12	Using where
+1	SIMPLE	t4	range	PRIMARY	PRIMARY	1	NULL	12	Using index condition
 1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1199	Using where
 explain select companynr,companyname from t4 left join t2 using (companynr) where companynr > 0 or companynr < 0 or companynr > 0;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t4	ALL	PRIMARY	NULL	NULL	NULL	12	Using where
+1	SIMPLE	t4	range	PRIMARY	PRIMARY	1	NULL	12	Using index condition
 1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1199	Using where
 explain select companynr,companyname from t4 left join t2 using (companynr) where ifnull(companynr,1)>0;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra