Fixed bug #19396: a crash for a an outer join operation

over two views when using syntax with curly braces.
Each outer join operation must be placed in a separate
nest. This was not done when the syntax with curly braces
was used. In some cases, in particular, for queries with outer
join operation over views it could cause a crash.

mysql-test/r/join_outer.result

@@ -1154,3 +1154,25 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	index	PRIMARY,name	name	23	NULL	3	Using where; Using index
 1	SIMPLE	t2	ref	fkey	fkey	5	test.t1.id	1	Using where; Using index
 DROP TABLE t1,t2;
+DROP VIEW IF EXISTS v1,v2;
+DROP TABLE IF EXISTS t1,t2;
+CREATE TABLE t1 (a int);
+CREATE table t2 (b int);
+INSERT INTO t1 VALUES (1), (2), (3), (4), (1), (1), (3);
+INSERT INTO t2 VALUES (2), (3);
+CREATE VIEW v1 AS SELECT a FROM t1 JOIN t2 ON t1.a=t2.b;
+CREATE VIEW v2 AS SELECT b FROM t2 JOIN t1 ON t2.b=t1.a;
+SELECT v1.a, v2. b 
+FROM v1 LEFT OUTER JOIN v2 ON (v1.a=v2.b) AND (v1.a >= 3)
+GROUP BY v1.a;
+a	b
+2	NULL
+3	3
+SELECT v1.a, v2. b 
+FROM { OJ v1 LEFT OUTER JOIN v2 ON (v1.a=v2.b) AND (v1.a >= 3) }
+GROUP BY v1.a;
+a	b
+2	NULL
+3	3
+DROP VIEW v1,v2;
+DROP TABLE t1,t2;

mysql-test/t/join_outer.test

@@ -779,3 +779,29 @@ SELECT COUNT(*) FROM t2 LEFT JOIN t1 ON t2.fkey = t1.id
   WHERE t1.name LIKE 'A%' OR FALSE;
 
 DROP TABLE t1,t2;
+
+#
+# Bug 19396: LEFT OUTER JOIN over views in curly braces 
+# 
+--disable_warnings
+DROP VIEW IF EXISTS v1,v2;
+DROP TABLE IF EXISTS t1,t2;
+--enable_warnings
+
+CREATE TABLE t1 (a int);
+CREATE table t2 (b int);
+INSERT INTO t1 VALUES (1), (2), (3), (4), (1), (1), (3);
+INSERT INTO t2 VALUES (2), (3);
+
+CREATE VIEW v1 AS SELECT a FROM t1 JOIN t2 ON t1.a=t2.b;
+CREATE VIEW v2 AS SELECT b FROM t2 JOIN t1 ON t2.b=t1.a;
+
+SELECT v1.a, v2. b 
+  FROM v1 LEFT OUTER JOIN v2 ON (v1.a=v2.b) AND (v1.a >= 3)
+    GROUP BY v1.a;
+SELECT v1.a, v2. b 
+  FROM { OJ v1 LEFT OUTER JOIN v2 ON (v1.a=v2.b) AND (v1.a >= 3) }
+    GROUP BY v1.a;
+
+DROP VIEW v1,v2;
+DROP TABLE t1,t2;

sql/sql_yacc.yy

@@ -448,6 +448,7 @@ bool my_yyoverflow(short **a, YYSTYPE **b, ulong *yystacksize);
 %token  NUMERIC_SYM
 %token  NVARCHAR_SYM
 %token  OFFSET_SYM
+%token  OJ_SYM
 %token  OLD_PASSWORD
 %token  ON
 %token  ONE_SHOT_SYM
@@ -5246,11 +5247,14 @@ table_factor:
           }
           expr '}'
 	  {
+	    LEX *lex= Lex;
             YYERROR_UNLESS($3 && $7);
             add_join_on($7,$10);
             Lex->pop_context();
             $7->outer_join|=JOIN_TYPE_LEFT;
             $$=$7;
+            if (!($$= lex->current_select->nest_last_join(lex->thd)))
+              YYABORT;
           }
 	| select_derived_init get_select_lex select_derived2
           {