Manual merge

configure.in:
  Auto merged
mysql-test/r/null_key.result:
  Auto merged
mysql-test/t/null_key.test:
  Auto merged
sql/sql_select.cc:
  Auto merged
support-files/mysql.spec.sh:
  Auto merged

mysql-test/r/func_gconcat.result

@@ -524,3 +524,34 @@ group_concat(a)
 ABW
 ABW
 drop table t1;
+CREATE TABLE t1 (
+aID smallint(5) unsigned NOT NULL auto_increment,
+sometitle varchar(255) NOT NULL default '',
+bID smallint(5) unsigned NOT NULL,
+PRIMARY KEY  (aID),
+UNIQUE KEY sometitle (sometitle)
+);
+INSERT INTO t1 SET sometitle = 'title1', bID = 1;
+INSERT INTO t1 SET sometitle = 'title2', bID = 1;
+CREATE TABLE t2 (
+bID smallint(5) unsigned NOT NULL auto_increment,
+somename varchar(255) NOT NULL default '',
+PRIMARY KEY  (bID),
+UNIQUE KEY somename (somename)
+);
+INSERT INTO t2 SET somename = 'test';
+SELECT COUNT(*), GROUP_CONCAT(DISTINCT t2.somename SEPARATOR ' |')
+FROM t1 JOIN t2 ON t1.bID = t2.bID;
+COUNT(*)	GROUP_CONCAT(DISTINCT t2.somename SEPARATOR ' |')
+2	test
+INSERT INTO t2 SET somename = 'test2';
+SELECT COUNT(*), GROUP_CONCAT(DISTINCT t2.somename SEPARATOR ' |')
+FROM t1 JOIN t2 ON t1.bID = t2.bID;
+COUNT(*)	GROUP_CONCAT(DISTINCT t2.somename SEPARATOR ' |')
+2	test
+DELETE FROM t2 WHERE somename = 'test2';
+SELECT COUNT(*), GROUP_CONCAT(DISTINCT t2.somename SEPARATOR ' |')
+FROM t1 JOIN t2 ON t1.bID = t2.bID;
+COUNT(*)	GROUP_CONCAT(DISTINCT t2.somename SEPARATOR ' |')
+2	test
+DROP TABLE t1,t2;

mysql-test/r/null_key.result

@@ -369,3 +369,63 @@ select * from t1;
 id	id2
 1	1
 drop table t1;
+CREATE TABLE t1 (a int);
+CREATE TABLE t2 (a int, b int, INDEX idx(a));
+CREATE TABLE t3 (b int, INDEX idx(b));
+CREATE TABLE t4 (b int, INDEX idx(b));
+INSERT INTO t1 VALUES (1), (2), (3), (4);
+INSERT INTO t2 VALUES (1, 1), (3, 1);
+INSERT INTO t3 VALUES 
+(NULL), (NULL), (NULL), (NULL), (NULL),
+(NULL), (NULL), (NULL), (NULL), (NULL);
+INSERT INTO t4 SELECT * FROM t3;
+INSERT INTO t3 SELECT * FROM t4;
+INSERT INTO t4 SELECT * FROM t3;
+INSERT INTO t3 SELECT * FROM t4;
+INSERT INTO t4 SELECT * FROM t3;
+INSERT INTO t3 SELECT * FROM t4;
+INSERT INTO t4 SELECT * FROM t3;
+INSERT INTO t3 SELECT * FROM t4;
+INSERT INTO t4 SELECT * FROM t3;
+INSERT INTO t3 SELECT * FROM t4;
+INSERT INTO t4 SELECT * FROM t3;
+INSERT INTO t3 SELECT * FROM t4;
+INSERT INTO t4 SELECT * FROM t3;
+INSERT INTO t3 SELECT * FROM t4;
+INSERT INTO t4 SELECT * FROM t3;
+INSERT INTO t3 SELECT * FROM t4;
+INSERT INTO t3 VALUES (2), (3);
+ANALYZE table t1, t2, t3;
+Table	Op	Msg_type	Msg_text
+test.t1	analyze	status	OK
+test.t2	analyze	status	OK
+test.t3	analyze	status	OK
+SELECT COUNT(*) FROM t3;
+COUNT(*)
+15972
+EXPLAIN SELECT SQL_CALC_FOUND_ROWS * FROM t1 LEFT JOIN t2 ON t1.a=t2.a
+LEFT JOIN t3 ON t2.b=t3.b;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	4	
+1	SIMPLE	t2	ref	idx	idx	5	test.t1.a	1	
+1	SIMPLE	t3	ref	idx	idx	5	test.t2.b	1	Using index
+FLUSH STATUS ;
+SELECT SQL_CALC_FOUND_ROWS * FROM t1 LEFT JOIN t2 ON t1.a=t2.a
+LEFT JOIN t3 ON t2.b=t3.b;
+a	a	b	b
+1	1	1	NULL
+2	NULL	NULL	NULL
+3	3	1	NULL
+4	NULL	NULL	NULL
+SHOW STATUS LIKE "handler_read%";
+Variable_name	Value
+Handler_read_first	0
+Handler_read_key	6
+Handler_read_next	2
+Handler_read_prev	0
+Handler_read_rnd	0
+Handler_read_rnd_next	5
+SELECT FOUND_ROWS();
+FOUND_ROWS()
+4
+DROP TABLE t1,t2,t3,t4;

mysql-test/t/func_gconcat.test

@@ -310,12 +310,37 @@ select a, group_concat(b order by b) from t1 group by a with rollup;
 select a, group_concat(distinct b order by b) from t1 group by a with rollup;
 drop table t1;
 
-# End of 4.1 tests
-
 #
-# Bug #6475
+# Bug #12095: GROUP_CONCAT for one row table 
 #
-create table t1 (a char(3), b char(20), primary key (a, b));
-insert into t1 values ('ABW', 'Dutch'), ('ABW', 'English');
-select group_concat(a) from t1 group by b;
-drop table t1;
+
+CREATE TABLE t1 (
+  aID smallint(5) unsigned NOT NULL auto_increment,
+  sometitle varchar(255) NOT NULL default '',
+  bID smallint(5) unsigned NOT NULL,
+  PRIMARY KEY  (aID),
+  UNIQUE KEY sometitle (sometitle)
+);
+INSERT INTO t1 SET sometitle = 'title1', bID = 1;
+INSERT INTO t1 SET sometitle = 'title2', bID = 1;
+
+CREATE TABLE t2 (
+  bID smallint(5) unsigned NOT NULL auto_increment,
+  somename varchar(255) NOT NULL default '',
+  PRIMARY KEY  (bID),
+  UNIQUE KEY somename (somename)
+);
+INSERT INTO t2 SET somename = 'test';
+
+SELECT COUNT(*), GROUP_CONCAT(DISTINCT t2.somename SEPARATOR ' |')
+  FROM t1 JOIN t2 ON t1.bID = t2.bID;
+INSERT INTO t2 SET somename = 'test2';
+SELECT COUNT(*), GROUP_CONCAT(DISTINCT t2.somename SEPARATOR ' |')
+  FROM t1 JOIN t2 ON t1.bID = t2.bID;
+DELETE FROM t2 WHERE somename = 'test2';
+SELECT COUNT(*), GROUP_CONCAT(DISTINCT t2.somename SEPARATOR ' |')
+  FROM t1 JOIN t2 ON t1.bID = t2.bID;
+
+DROP TABLE t1,t2;
+
+# End of 4.1 tests

mysql-test/t/null_key.test

@@ -194,4 +194,49 @@ delete from t1 where id <=> NULL;
 select * from t1;
 drop table t1;
 
+#
+# Test for bug #12144: optimizations for key access with null keys 
+#                      used for outer joins
+#
+
+CREATE TABLE t1 (a int);
+CREATE TABLE t2 (a int, b int, INDEX idx(a));
+CREATE TABLE t3 (b int, INDEX idx(b));
+CREATE TABLE t4 (b int, INDEX idx(b));
+INSERT INTO t1 VALUES (1), (2), (3), (4);
+INSERT INTO t2 VALUES (1, 1), (3, 1);
+INSERT INTO t3 VALUES 
+  (NULL), (NULL), (NULL), (NULL), (NULL),
+  (NULL), (NULL), (NULL), (NULL), (NULL);
+INSERT INTO t4 SELECT * FROM t3;
+INSERT INTO t3 SELECT * FROM t4;
+INSERT INTO t4 SELECT * FROM t3;
+INSERT INTO t3 SELECT * FROM t4;
+INSERT INTO t4 SELECT * FROM t3;
+INSERT INTO t3 SELECT * FROM t4;
+INSERT INTO t4 SELECT * FROM t3;
+INSERT INTO t3 SELECT * FROM t4;
+INSERT INTO t4 SELECT * FROM t3;
+INSERT INTO t3 SELECT * FROM t4;
+INSERT INTO t4 SELECT * FROM t3;
+INSERT INTO t3 SELECT * FROM t4;
+INSERT INTO t4 SELECT * FROM t3;
+INSERT INTO t3 SELECT * FROM t4;
+INSERT INTO t4 SELECT * FROM t3;
+INSERT INTO t3 SELECT * FROM t4;
+INSERT INTO t3 VALUES (2), (3);
+
+ANALYZE table t1, t2, t3;
+
+SELECT COUNT(*) FROM t3;
+
+EXPLAIN SELECT SQL_CALC_FOUND_ROWS * FROM t1 LEFT JOIN t2 ON t1.a=t2.a
+                                             LEFT JOIN t3 ON t2.b=t3.b;
+FLUSH STATUS ;
+SELECT SQL_CALC_FOUND_ROWS * FROM t1 LEFT JOIN t2 ON t1.a=t2.a
+                                     LEFT JOIN t3 ON t2.b=t3.b;
+SHOW STATUS LIKE "handler_read%";
+SELECT FOUND_ROWS();
+
+DROP TABLE t1,t2,t3,t4;
 # End of 4.1 tests

sql/sql_class.h

@@ -1705,13 +1705,14 @@ public:
   bool  using_indirect_summary_function;
   /* If >0 convert all blob fields to varchar(convert_blob_length) */
   uint  convert_blob_length; 
+  bool need_const; /* <=> const items are saved in tmp table */
   CHARSET_INFO *table_charset; 
   bool schema_table;
 
   TMP_TABLE_PARAM()
     :copy_field(0), group_parts(0),
     group_length(0), group_null_parts(0), convert_blob_length(0),
-    schema_table(0)
+    need_const(0), schema_table(0)
   {}
   ~TMP_TABLE_PARAM()
   {

sql/sql_select.cc

@@ -2759,7 +2759,9 @@ add_key_field(KEY_FIELD **key_fields,uint and_level, Item_func *cond,
   */
   (*key_fields)->null_rejecting= (cond->functype() == Item_func::EQ_FUNC) &&
                                  ((*value)->type() == Item::FIELD_ITEM) &&
-                                 ((Item_field*)*value)->field->maybe_null();
+
+                        (((Item_field*)*value)->field->maybe_null() ||
+			 ((Item_field *)*value)->field->table->maybe_null);
   (*key_fields)++;
 }
 
@@ -8256,7 +8258,8 @@ create_tmp_table(THD *thd,TMP_TABLE_PARAM *param,List<Item> &fields,
 	param->using_indirect_summary_function=1;
 	continue;
       }
-      if (item->const_item() && (int) hidden_field_count <= 0)
+      if (item->const_item() && (int) hidden_field_count <= 0 &&
+          !param->need_const)
         continue; // We don't have to store this
     }
     if (type == Item::SUM_FUNC_ITEM && !group && !save_sum_fields)
@@ -9857,6 +9860,11 @@ join_read_always_key(JOIN_TAB *tab)
   int error;
   TABLE *table= tab->table;
 
+  for (uint i= 0 ; i < tab->ref.key_parts ; i++)
+  {
+    if ((tab->ref.null_rejecting & 1 << i) && tab->ref.items[i]->is_null())
+        return -1;
+  } 
   if (!table->file->inited)
     table->file->ha_index_init(tab->ref.key);
   if (cp_buffer_from_ref(tab->join->thd, &tab->ref))