Buildbot fixes

- Update test results (checked)
- Fix compiler warning

mysql-test/r/group_by.result

@@ -1543,7 +1543,7 @@ EXPLAIN SELECT 1 FROM t1 WHERE a IN
 (SELECT a FROM t1 USE INDEX (i2) IGNORE INDEX (i2));
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	index	PRIMARY,i2	PRIMARY	4	NULL	144	Using index
-1	PRIMARY	<subquery2>	eq_ref	distinct_key	distinct_key	4	func	1	
+1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	144	Using where; FirstMatch(t1)
 CREATE TABLE t2 (a INT, b INT, KEY(a));
 INSERT INTO t2 VALUES (1, 1), (2, 2), (3,3), (4,4);
 EXPLAIN SELECT a, SUM(b) FROM t2 GROUP BY a LIMIT 2;

mysql-test/r/group_min_max.result

@@ -2401,7 +2401,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 EXPLAIN SELECT 1 FROM t1 AS t1_outer WHERE 
 a IN (SELECT max(b) FROM t1 GROUP BY a HAVING a < 2);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	<subquery2>	ALL	distinct_key	NULL	NULL	NULL	8	Using where
+1	PRIMARY	t1_outer	index	NULL	a	10	NULL	15	Using where; Using index
 2	DEPENDENT SUBQUERY	t1	index	NULL	a	10	NULL	1	Using index
 EXPLAIN SELECT 1 FROM t1 AS t1_outer GROUP BY a HAVING 
 a > (SELECT max(b) FROM t1 GROUP BY a HAVING a < 2);

mysql-test/r/metadata.result

@@ -55,7 +55,7 @@ id	data	data
 2	female	no
 select t1.id from t1 union select t2.id from t2;
 Catalog	Database	Table	Table_alias	Column	Column_alias	Type	Length	Max length	Is_null	Flags	Decimals	Charsetnr
-def				id	id	1	4	1	Y	49152	0	63
+def				id	id	1	4	1	Y	32768	0	63
 id
 1
 2
@@ -66,7 +66,7 @@ insert into t1 values (2,'two');
 set @arg00=1 ;
 select @arg00 FROM t1 where a=1 union distinct select 1 FROM t1 where a=1;
 Catalog	Database	Table	Table_alias	Column	Column_alias	Type	Length	Max length	Is_null	Flags	Decimals	Charsetnr
-def				@arg00	@arg00	8	20	1	Y	49152	0	63
+def				@arg00	@arg00	8	20	1	Y	32768	0	63
 @arg00
 1
 select * from (select @arg00) aaa;
@@ -76,7 +76,7 @@ def			aaa	@arg00	@arg00	8	20	1	Y	32768	0	63
 1
 select 1 union select 1;
 Catalog	Database	Table	Table_alias	Column	Column_alias	Type	Length	Max length	Is_null	Flags	Decimals	Charsetnr
-def				1	1	8	20	1	N	49153	0	63
+def				1	1	8	20	1	N	32769	0	63
 1
 1
 select * from (select 1 union select 1) aaa;

sql/sql_select.cc

@@ -5926,7 +5926,7 @@ void JOIN::get_partial_cost_and_fanout(uint end_tab_idx,
 {
   double record_count= 1;
   double read_time= 0.0;
-  double sj_inner_fanout;
+  double sj_inner_fanout= 1.0;
   JOIN_TAB *end_tab= NULL;
   JOIN_TAB *tab;
   uint i;