mysql_priv.h:

  Fixed bug #12154: a query returned: Column <name> cannot be null.
  The problem was due to a bug in the function setup_table_map:
  the flag maybe_null was set up incorrectly for inner tables of
  nested outer joins.
join_nested.result, join_nested.test:
  Added a test case for bug #12154.


mysql-test/t/join_nested.test:
  Added a test case for bug #12154.
mysql-test/r/join_nested.result:
  Added a test case for bug #12154.
sql/mysql_priv.h:
  Fixed bug #12154: a query returned: Column <name> cannot be null.
  The problem was due to a bug in the function setup_table_map:
  the flag maybe_null was set up incorrectly for inner tables of
  nested outer joins.

mysql-test/r/join_nested.result

@@ -1343,3 +1343,58 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	0	
 1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	0	
 DROP TABLE t1,t2,t3;
+CREATE TABLE t1 (goods int(12) NOT NULL, price varchar(128) NOT NULL);
+INSERT INTO t1 VALUES (23, 2340), (26, 9900);
+CREATE TABLE t2 (goods int(12), name varchar(50), shop char(2));
+INSERT INTO t2 VALUES (23, 'as300', 'fr'), (26, 'as600', 'fr');
+create table t3 (groupid int(12) NOT NULL, goodsid int(12) NOT NULL);
+INSERT INTO t3 VALUES (3,23), (6,26);
+CREATE TABLE t4 (groupid int(12));
+INSERT INTO t4 VALUES (1), (2), (3), (4), (5), (6);
+SELECT * FROM
+(SELECT DISTINCT gl.groupid, gp.price
+FROM t4 gl 
+LEFT JOIN
+(t3 g INNER JOIN t2 p ON g.goodsid = p.goods 
+INNER JOIN t1 gp ON p.goods = gp.goods)
+ON gl.groupid = g.groupid and p.shop = 'fr') t;
+groupid	price
+1	NULL
+2	NULL
+3	2340
+4	NULL
+5	NULL
+6	9900
+CREATE VIEW v1 AS
+SELECT g.groupid groupid, p.goods goods,  
+p.name name, p.shop shop, 
+gp.price price
+FROM t3 g INNER JOIN t2 p ON g.goodsid = p.goods
+INNER JOIN t1 gp on p.goods = gp.goods;
+CREATE VIEW v2 AS
+SELECT DISTINCT g.groupid, fr.price
+FROM t4 g
+LEFT JOIN
+v1 fr on g.groupid = fr.groupid and fr.shop = 'fr';
+SELECT * FROM v2;
+groupid	price
+1	NULL
+2	NULL
+3	2340
+4	NULL
+5	NULL
+6	9900
+SELECT * FROM 
+(SELECT DISTINCT g.groupid, fr.price
+FROM t4 g
+LEFT JOIN
+v1 fr on g.groupid = fr.groupid and fr.shop = 'fr') t;
+groupid	price
+1	NULL
+2	NULL
+3	2340
+4	NULL
+5	NULL
+6	9900
+DROP VIEW v1,v2;
+DROP TABLE t1,t2,t3,t4;

mysql-test/t/join_nested.test

@@ -770,3 +770,51 @@ SELECT * FROM t1 LEFT JOIN (t2 LEFT JOIN t3 ON c21=c31) ON c11=c21;
 EXPLAIN SELECT * FROM t1 LEFT JOIN (t2 LEFT JOIN t3 ON c21=c31) ON c11=c21;
 
 DROP TABLE t1,t2,t3;
+
+#
+# Bug #12154: creation of temp table for a query with nested outer join
+# 
+
+CREATE TABLE t1 (goods int(12) NOT NULL, price varchar(128) NOT NULL);
+INSERT INTO t1 VALUES (23, 2340), (26, 9900);
+
+CREATE TABLE t2 (goods int(12), name varchar(50), shop char(2));
+INSERT INTO t2 VALUES (23, 'as300', 'fr'), (26, 'as600', 'fr');
+
+create table t3 (groupid int(12) NOT NULL, goodsid int(12) NOT NULL);
+INSERT INTO t3 VALUES (3,23), (6,26);
+
+CREATE TABLE t4 (groupid int(12));
+INSERT INTO t4 VALUES (1), (2), (3), (4), (5), (6);
+
+SELECT * FROM
+(SELECT DISTINCT gl.groupid, gp.price
+  FROM t4 gl 
+       LEFT JOIN
+       (t3 g INNER JOIN t2 p ON g.goodsid = p.goods 
+             INNER JOIN t1 gp ON p.goods = gp.goods)
+       ON gl.groupid = g.groupid and p.shop = 'fr') t;
+
+CREATE VIEW v1 AS
+SELECT g.groupid groupid, p.goods goods,  
+       p.name name, p.shop shop, 
+       gp.price price
+  FROM t3 g INNER JOIN t2 p ON g.goodsid = p.goods
+            INNER JOIN t1 gp on p.goods = gp.goods;
+
+CREATE VIEW v2 AS
+SELECT DISTINCT g.groupid, fr.price
+  FROM t4 g
+       LEFT JOIN
+       v1 fr on g.groupid = fr.groupid and fr.shop = 'fr';
+
+SELECT * FROM v2;
+
+SELECT * FROM 
+(SELECT DISTINCT g.groupid, fr.price
+  FROM t4 g
+       LEFT JOIN
+       v1 fr on g.groupid = fr.groupid and fr.shop = 'fr') t;
+
+DROP VIEW v1,v2;
+DROP TABLE t1,t2,t3,t4;

sql/mysql_priv.h

@@ -1450,6 +1450,12 @@ inline void setup_table_map(TABLE *table, TABLE_LIST *table_list, uint tablenr)
   table->status= STATUS_NO_RECORD;
   table->keys_in_use_for_query= table->s->keys_in_use;
   table->maybe_null= table_list->outer_join;
+  TABLE_LIST *embedding= table_list->embedding;
+  while (!table->maybe_null && embedding)
+  {
+    table->maybe_null= embedding->outer_join;
+    embedding= embedding->embedding;
+  }
   table->tablenr= tablenr;
   table->map= (table_map) 1 << tablenr;
   table->force_index= table_list->force_index;