Merge 5.1->5.2

mysql-test/r/explain.result

@@ -263,7 +263,7 @@ WHERE t1.f1 GROUP BY t1.f1));
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	system	NULL	NULL	NULL	NULL	1	
 2	SUBQUERY	a	system	NULL	NULL	NULL	NULL	1	Using filesort
-2	SUBQUERY	t1	fulltext	f1	f1	0		1	Using where
+2	SUBQUERY	t1	fulltext	f1_2,f1	f1	0		1	Using where
 PREPARE stmt FROM
 'EXPLAIN SELECT 1 FROM t1
  WHERE 1 > ALL((SELECT 1 FROM t1 RIGHT OUTER JOIN t1 a
@@ -273,12 +273,12 @@ EXECUTE stmt;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	system	NULL	NULL	NULL	NULL	1	
 2	SUBQUERY	a	system	NULL	NULL	NULL	NULL	1	Using filesort
-2	SUBQUERY	t1	fulltext	f1	f1	0		1	Using where
+2	SUBQUERY	t1	fulltext	f1_2,f1	f1	0		1	Using where
 EXECUTE stmt;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	system	NULL	NULL	NULL	NULL	1	
 2	SUBQUERY	a	system	NULL	NULL	NULL	NULL	1	Using filesort
-2	SUBQUERY	t1	fulltext	f1	f1	0		1	Using where
+2	SUBQUERY	t1	fulltext	f1_2,f1	f1	0		1	Using where
 DEALLOCATE PREPARE stmt;
 PREPARE stmt FROM
 'EXPLAIN SELECT 1 FROM t1
@@ -289,12 +289,12 @@ EXECUTE stmt;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	system	NULL	NULL	NULL	NULL	1	
 2	SUBQUERY	a	system	NULL	NULL	NULL	NULL	1	Using filesort
-2	SUBQUERY	t1	fulltext	f1	f1	0		1	Using where
+2	SUBQUERY	t1	fulltext	f1_2,f1	f1	0		1	Using where
 EXECUTE stmt;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	system	NULL	NULL	NULL	NULL	1	
 2	SUBQUERY	a	system	NULL	NULL	NULL	NULL	1	Using filesort
-2	SUBQUERY	t1	fulltext	f1	f1	0		1	Using where
+2	SUBQUERY	t1	fulltext	f1_2,f1	f1	0		1	Using where
 DEALLOCATE PREPARE stmt;
 DROP TABLE t1;
 End of 5.1 tests.

mysql-test/r/join_outer.result

@@ -1378,7 +1378,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	SIMPLE	jt5	index	NULL	PRIMARY	4	NULL	2	100.00	Using index
 1	SIMPLE	jt2	index	NULL	PRIMARY	4	NULL	2	100.00	Using index
 Warnings:
-Note	1003	select straight_join `test`.`jt1`.`f1` AS `f1` from `test`.`t1` `jt1` left join (`test`.`t1` `jt6` left join (`test`.`t1` `jt3` join `test`.`t1` `jt4` left join `test`.`t1` `jt5` on(1) left join `test`.`t1` `jt2` on(1)) on((`test`.`jt6`.`f1` and 1))) on(1) where 1
+Note	1003	select straight_join `test`.`jt1`.`f1` AS `f1` from `test`.`t1` `jt1` left join (`test`.`t1` `jt6` left join (`test`.`t1` `jt3` join `test`.`t1` `jt4` left join `test`.`t1` `jt5` on(1) left join `test`.`t1` `jt2` on(1)) on(((`test`.`jt6`.`f1` <> 0) and 1))) on(1) where 1
 EXPLAIN EXTENDED SELECT STRAIGHT_JOIN jt1.f1 FROM t1 AS jt1
 RIGHT JOIN t1 AS jt2
 RIGHT JOIN t1 AS jt3
@@ -1395,7 +1395,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	SIMPLE	jt2	index	NULL	PRIMARY	4	NULL	2	100.00	Using index
 1	SIMPLE	jt1	index	NULL	PRIMARY	4	NULL	2	100.00	Using index
 Warnings:
-Note	1003	select straight_join `test`.`jt1`.`f1` AS `f1` from `test`.`t1` `jt6` left join (`test`.`t1` `jt3` join `test`.`t1` `jt4` left join `test`.`t1` `jt5` on(1) left join `test`.`t1` `jt2` on(1)) on((`test`.`jt6`.`f1` and 1)) left join `test`.`t1` `jt1` on(1) where 1
+Note	1003	select straight_join `test`.`jt1`.`f1` AS `f1` from `test`.`t1` `jt6` left join (`test`.`t1` `jt3` join `test`.`t1` `jt4` left join `test`.`t1` `jt5` on(1) left join `test`.`t1` `jt2` on(1)) on(((`test`.`jt6`.`f1` <> 0) and 1)) left join `test`.`t1` `jt1` on(1) where 1
 DROP TABLE t1;
 #
 # Bug#49600: outer join of two single-row tables with joining attributes

mysql-test/r/negation_elimination.result

@@ -4,7 +4,7 @@ insert into t1 values (NULL), (0), (1), (2), (3), (4), (5), (6), (7), (8), (9),
 (10), (11), (12), (13), (14), (15), (16), (17), (18), (19);
 explain select * from t1 where not(not(a));
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	index	NULL	a	5	NULL	21	Using where; Using index
+1	SIMPLE	t1	range	a	a	5	NULL	20	Using where; Using index
 select * from t1 where not(not(a));
 a
 1
@@ -385,7 +385,7 @@ NULL	NULL
 3	1
 explain extended select a, not(not(a)), not(a <= 2 and not(a)), not(a not like "1"), not (a not in (1,2)), not(a != 2) from t1 where not(not(a)) having not(not(a));
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	SIMPLE	t1	index	NULL	a	5	NULL	5	100.00	Using where; Using index
+1	SIMPLE	t1	range	a	a	5	NULL	4	100.00	Using where; Using index
 Warnings:
-Note	1003	select `test`.`t1`.`a` AS `a`,(`test`.`t1`.`a` <> 0) AS `not(not(a))`,((`test`.`t1`.`a` > 2) or `test`.`t1`.`a`) AS `not(a <= 2 and not(a))`,(`test`.`t1`.`a` like '1') AS `not(a not like "1")`,(`test`.`t1`.`a` in (1,2)) AS `not (a not in (1,2))`,(`test`.`t1`.`a` = 2) AS `not(a != 2)` from `test`.`t1` where `test`.`t1`.`a` having `test`.`t1`.`a`
+Note	1003	select `test`.`t1`.`a` AS `a`,(`test`.`t1`.`a` <> 0) AS `not(not(a))`,((`test`.`t1`.`a` > 2) or `test`.`t1`.`a`) AS `not(a <= 2 and not(a))`,(`test`.`t1`.`a` like '1') AS `not(a not like "1")`,(`test`.`t1`.`a` in (1,2)) AS `not (a not in (1,2))`,(`test`.`t1`.`a` = 2) AS `not(a != 2)` from `test`.`t1` where (`test`.`t1`.`a` <> 0) having (`test`.`t1`.`a` <> 0)
 drop table t1;

mysql-test/r/view.result

@@ -3711,7 +3711,7 @@ CREATE TABLE t1 (c INT);
 CREATE VIEW v1 (view_column) AS SELECT c AS alias FROM t1 HAVING alias;
 SHOW CREATE VIEW v1;
 View	Create View	character_set_client	collation_connection
-v1	CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS select `t1`.`c` AS `view_column` from `t1` having `view_column`	latin1	latin1_swedish_ci
+v1	CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS select `t1`.`c` AS `view_column` from `t1` having (`view_column` <> 0)	latin1	latin1_swedish_ci
 SELECT * FROM v1;
 view_column
 
@@ -3906,6 +3906,23 @@ SELECT * FROM v1;
 a
 DROP VIEW v1;
 DROP TABLE t1;
+#
+# LP BUG#777809 (a retrograded condition for view ON)
+#
+CREATE TABLE t1 ( f1 int NOT NULL , f6 int NOT NULL ) ;
+INSERT IGNORE INTO t1 VALUES (20, 2);
+CREATE TABLE t2 ( f3 int NOT NULL ) ;
+INSERT IGNORE INTO t2 VALUES (7);
+CREATE OR REPLACE VIEW v2 AS SELECT * FROM t2;
+PREPARE prep_stmt FROM 'SELECT t1.f6 FROM t1 RIGHT JOIN v2 ON v2.f3 WHERE t1.f1 != 0';
+EXECUTE prep_stmt;
+f6
+2
+EXECUTE prep_stmt;
+f6
+2
+drop view v2;
+drop table t1,t2;
 # -----------------------------------------------------------------
 # -- End of 5.1 tests.
 # -----------------------------------------------------------------

mysql-test/suite/innodb/r/innodb_mysql.result

@@ -2623,47 +2623,6 @@ create table t1 (a int primary key, b int) engine = innodb;
 insert into t1 values (1,1),(2,1);
 alter ignore table t1 add unique `main` (b);
 drop table t1;
-#
-# Bug#56862 Execution of a query that uses index merge returns a wrong result
-#
-CREATE TABLE t1 (
-pk int NOT NULL AUTO_INCREMENT PRIMARY KEY,
-a int,
-b int,
-INDEX idx(a))
-ENGINE=INNODB;
-INSERT INTO t1(a,b) VALUES
-(11, 1100), (2, 200), (1, 100), (14, 1400), (5, 500),
-(3, 300), (17, 1700), (4, 400), (12, 1200), (8, 800),
-(6, 600), (18, 1800), (9, 900), (10, 1000), (7, 700),
-(13, 1300), (15, 1500), (19, 1900), (16, 1600), (20, 2000);
-INSERT INTO t1(a,b) SELECT a+20, b+2000 FROM t1;
-INSERT INTO t1(a,b) SELECT a+40, b+4000 FROM t1;
-INSERT INTO t1(a,b) SELECT a+80, b+8000 FROM t1;
-INSERT INTO t1(a,b) SELECT a,b FROM t1;
-INSERT INTO t1(a,b) SELECT a,b FROM t1;
-INSERT INTO t1(a,b) SELECT a,b FROM t1;
-INSERT INTO t1(a,b) SELECT a,b FROM t1;
-INSERT INTO t1(a,b) SELECT a,b FROM t1;
-INSERT INTO t1(a,b) SELECT a,b FROM t1;
-INSERT INTO t1(a,b) SELECT a,b FROM t1;
-INSERT INTO t1(a,b) SELECT a,b FROM t1;
-INSERT INTO t1 VALUES (1000000, 0, 0);
-SET SESSION sort_buffer_size = 1024*36;
-EXPLAIN
-SELECT COUNT(*) FROM
-(SELECT * FROM t1 FORCE INDEX (idx,PRIMARY)
-WHERE a BETWEEN 2 AND 7 OR pk=1000000) AS t;
-id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
-2	DERIVED	t1	index_merge	PRIMARY,idx	idx,PRIMARY	5,4	NULL	3537	Using sort_union(idx,PRIMARY); Using where
-SELECT COUNT(*) FROM
-(SELECT * FROM t1 FORCE INDEX (idx,PRIMARY)
-WHERE a BETWEEN 2 AND 7 OR pk=1000000) AS t;
-COUNT(*)
-1537
-SET SESSION sort_buffer_size = DEFAULT;
-DROP TABLE t1;
 End of 5.1 tests
 #
 # Test for bug #39932 "create table fails if column for FK is in different

mysql-test/suite/innodb/t/innodb_mysql.test

@@ -849,51 +849,6 @@ insert into t1 values (1,1),(2,1);
 alter ignore table t1 add unique `main` (b);
 drop table t1;
 
---echo #
---echo # Bug#56862 Execution of a query that uses index merge returns a wrong result
---echo #
-
-CREATE TABLE t1 (
-  pk int NOT NULL AUTO_INCREMENT PRIMARY KEY,
-  a int,
-  b int,
-  INDEX idx(a))
-ENGINE=INNODB;
-
-INSERT INTO t1(a,b) VALUES
-  (11, 1100), (2, 200), (1, 100), (14, 1400), (5, 500),
-  (3, 300), (17, 1700), (4, 400), (12, 1200), (8, 800),
-  (6, 600), (18, 1800), (9, 900), (10, 1000), (7, 700),
-  (13, 1300), (15, 1500), (19, 1900), (16, 1600), (20, 2000);
-INSERT INTO t1(a,b) SELECT a+20, b+2000 FROM t1;
-INSERT INTO t1(a,b) SELECT a+40, b+4000 FROM t1;
-INSERT INTO t1(a,b) SELECT a+80, b+8000 FROM t1;
-INSERT INTO t1(a,b) SELECT a,b FROM t1;
-INSERT INTO t1(a,b) SELECT a,b FROM t1;
-INSERT INTO t1(a,b) SELECT a,b FROM t1;
-INSERT INTO t1(a,b) SELECT a,b FROM t1;
-INSERT INTO t1(a,b) SELECT a,b FROM t1;
-INSERT INTO t1(a,b) SELECT a,b FROM t1;
-INSERT INTO t1(a,b) SELECT a,b FROM t1;
-INSERT INTO t1(a,b) SELECT a,b FROM t1;
-INSERT INTO t1 VALUES (1000000, 0, 0);
-
-SET SESSION sort_buffer_size = 1024*36;
-
-EXPLAIN
-SELECT COUNT(*) FROM
-  (SELECT * FROM t1 FORCE INDEX (idx,PRIMARY)
-     WHERE a BETWEEN 2 AND 7 OR pk=1000000) AS t;
-
-SELECT COUNT(*) FROM
-  (SELECT * FROM t1 FORCE INDEX (idx,PRIMARY)
-     WHERE a BETWEEN 2 AND 7 OR pk=1000000) AS t;
-
-SET SESSION sort_buffer_size = DEFAULT;
-
-DROP TABLE t1;
-
-
 --echo End of 5.1 tests
 
 

mysql-test/suite/innodb_plugin/r/innodb_mysql.result

@@ -2410,42 +2410,4 @@ PACK_KEYS=0;
 CREATE INDEX a ON t1 (a);
 CREATE INDEX c on t1 (c);
 DROP TABLE t1;
-CREATE TABLE t1 (
-pk int NOT NULL AUTO_INCREMENT PRIMARY KEY,
-a int,
-b int,
-INDEX idx(a))
-ENGINE=INNODB;
-INSERT INTO t1(a,b) VALUES
-(11, 1100), (2, 200), (1, 100), (14, 1400), (5, 500),
-(3, 300), (17, 1700), (4, 400), (12, 1200), (8, 800),
-(6, 600), (18, 1800), (9, 900), (10, 1000), (7, 700),
-(13, 1300), (15, 1500), (19, 1900), (16, 1600), (20, 2000);
-INSERT INTO t1(a,b) SELECT a+20, b+2000 FROM t1;
-INSERT INTO t1(a,b) SELECT a+40, b+4000 FROM t1;
-INSERT INTO t1(a,b) SELECT a+80, b+8000 FROM t1;
-INSERT INTO t1(a,b) SELECT a,b FROM t1;
-INSERT INTO t1(a,b) SELECT a,b FROM t1;
-INSERT INTO t1(a,b) SELECT a,b FROM t1;
-INSERT INTO t1(a,b) SELECT a,b FROM t1;
-INSERT INTO t1(a,b) SELECT a,b FROM t1;
-INSERT INTO t1(a,b) SELECT a,b FROM t1;
-INSERT INTO t1(a,b) SELECT a,b FROM t1;
-INSERT INTO t1(a,b) SELECT a,b FROM t1;
-INSERT INTO t1 VALUES (1000000, 0, 0);
-SET SESSION sort_buffer_size = 1024*36;
-EXPLAIN
-SELECT COUNT(*) FROM
-(SELECT * FROM t1 FORCE INDEX (idx,PRIMARY)
-WHERE a BETWEEN 2 AND 7 OR pk=1000000) AS t;
-id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
-2	DERIVED	t1	index_merge	PRIMARY,idx	idx,PRIMARY	5,4	NULL	3537	Using sort_union(idx,PRIMARY); Using where
-SELECT COUNT(*) FROM
-(SELECT * FROM t1 FORCE INDEX (idx,PRIMARY)
-WHERE a BETWEEN 2 AND 7 OR pk=1000000) AS t;
-COUNT(*)
-1537
-SET SESSION sort_buffer_size = DEFAULT;
-DROP TABLE t1;
 End of 5.1 tests

mysql-test/suite/innodb_plugin/t/innodb_mysql.test

@@ -647,48 +647,4 @@ CREATE INDEX c on t1 (c);
 
 DROP TABLE t1;
 
-#
-# Bug#56862 Execution of a query that uses index merge returns a wrong result
-#
-
-CREATE TABLE t1 (
-  pk int NOT NULL AUTO_INCREMENT PRIMARY KEY,
-  a int,
-  b int,
-  INDEX idx(a))
-ENGINE=INNODB;
-
-INSERT INTO t1(a,b) VALUES
-  (11, 1100), (2, 200), (1, 100), (14, 1400), (5, 500),
-  (3, 300), (17, 1700), (4, 400), (12, 1200), (8, 800),
-  (6, 600), (18, 1800), (9, 900), (10, 1000), (7, 700),
-  (13, 1300), (15, 1500), (19, 1900), (16, 1600), (20, 2000);
-INSERT INTO t1(a,b) SELECT a+20, b+2000 FROM t1;
-INSERT INTO t1(a,b) SELECT a+40, b+4000 FROM t1;
-INSERT INTO t1(a,b) SELECT a+80, b+8000 FROM t1;
-INSERT INTO t1(a,b) SELECT a,b FROM t1;
-INSERT INTO t1(a,b) SELECT a,b FROM t1;
-INSERT INTO t1(a,b) SELECT a,b FROM t1;
-INSERT INTO t1(a,b) SELECT a,b FROM t1;
-INSERT INTO t1(a,b) SELECT a,b FROM t1;
-INSERT INTO t1(a,b) SELECT a,b FROM t1;
-INSERT INTO t1(a,b) SELECT a,b FROM t1;
-INSERT INTO t1(a,b) SELECT a,b FROM t1;
-INSERT INTO t1 VALUES (1000000, 0, 0);
-
-SET SESSION sort_buffer_size = 1024*36;
-
-EXPLAIN
-SELECT COUNT(*) FROM
-  (SELECT * FROM t1 FORCE INDEX (idx,PRIMARY)
-     WHERE a BETWEEN 2 AND 7 OR pk=1000000) AS t;
-
-SELECT COUNT(*) FROM
-  (SELECT * FROM t1 FORCE INDEX (idx,PRIMARY)
-     WHERE a BETWEEN 2 AND 7 OR pk=1000000) AS t;
-
-SET SESSION sort_buffer_size = DEFAULT;
-
-DROP TABLE t1;
-
 --echo End of 5.1 tests

mysql-test/t/view.test

@@ -3953,6 +3953,26 @@ SELECT * FROM v1;
 DROP VIEW v1;
 DROP TABLE t1;
 
+--echo #
+--echo # LP BUG#777809 (a retrograded condition for view ON)
+--echo #
+
+CREATE TABLE t1 ( f1 int NOT NULL , f6 int NOT NULL ) ;
+INSERT IGNORE INTO t1 VALUES (20, 2);
+
+CREATE TABLE t2 ( f3 int NOT NULL ) ;
+INSERT IGNORE INTO t2 VALUES (7);
+
+CREATE OR REPLACE VIEW v2 AS SELECT * FROM t2;
+
+PREPARE prep_stmt FROM 'SELECT t1.f6 FROM t1 RIGHT JOIN v2 ON v2.f3 WHERE t1.f1 != 0';
+
+EXECUTE prep_stmt;
+EXECUTE prep_stmt;
+
+drop view v2;
+drop table t1,t2;
+
 --echo # -----------------------------------------------------------------
 --echo # -- End of 5.1 tests.
 --echo # -----------------------------------------------------------------

sql/mysql_priv.h

@@ -1504,6 +1504,7 @@ bool add_to_list(THD *thd, SQL_I_List<ORDER> &list, Item *group,bool asc);
 bool push_new_name_resolution_context(THD *thd,
                                       TABLE_LIST *left_op,
                                       TABLE_LIST *right_op);
+Item *normalize_cond(Item *cond);
 void add_join_on(TABLE_LIST *b,Item *expr);
 void add_join_natural(TABLE_LIST *a,TABLE_LIST *b,List<String> *using_fields,
                       SELECT_LEX *lex);

sql/opt_range.h

@@ -271,7 +271,6 @@ class QUICK_SELECT_I
 
   virtual bool reverse_sorted() = 0;
   virtual bool unique_key_range() { return false; }
-  virtual bool clustered_pk_range() { return false; }
 
   enum {
     QS_TYPE_RANGE = 0,
@@ -542,8 +541,6 @@ class QUICK_INDEX_MERGE_SELECT : public QUICK_SELECT_I
   THD *thd;
   int read_keys_and_merge();
 
-  bool clustered_pk_range() { return test(pk_quick_select); }
-
   /* used to get rows collected in Unique */
   READ_RECORD read_record;
 };

sql/records.cc

@@ -195,15 +195,6 @@ bool init_read_record(READ_RECORD *info,THD *thd, TABLE *table,
 
   if (select && my_b_inited(&select->file))
     tempfile= &select->file;
-  else if (select && select->quick && select->quick->clustered_pk_range())
-  {
-    /*
-      In case of QUICK_INDEX_MERGE_SELECT with clustered pk range we have to
-      use its own access method(i.e QUICK_INDEX_MERGE_SELECT::get_next()) as
-      sort file does not contain rowids which satisfy clustered pk range.
-    */
-    tempfile= 0;
-  }
   else
     tempfile= table->sort.io_cache;
   if (tempfile && my_b_inited(tempfile) &&

sql/sql_parse.cc

@@ -6855,6 +6855,28 @@ push_new_name_resolution_context(THD *thd,
 }
 
 
+/**
+  Fix condition which contains only field (f turns to  f <> 0 )
+
+  @param cond            The condition to fix
+
+  @return fixed condition
+*/
+
+Item *normalize_cond(Item *cond)
+{
+  if (cond)
+  {
+    Item::Type type= cond->type();
+    if (type == Item::FIELD_ITEM || type == Item::REF_ITEM)
+    {
+      cond= new Item_func_ne(cond, new Item_int(0));
+    }
+  }
+  return cond;
+}
+
+
 /**
   Add an ON condition to the second operand of a JOIN ... ON.
 
@@ -6873,6 +6895,7 @@ void add_join_on(TABLE_LIST *b, Item *expr)
 {
   if (expr)
   {
+    expr= normalize_cond(expr);
     if (!b->on_expr)
       b->on_expr= expr;
     else

sql/sql_yacc.yy

@@ -9223,7 +9223,7 @@ where_clause:
           expr
           {
             SELECT_LEX *select= Select;
-            select->where= $3;
+            select->where= normalize_cond($3);
             select->parsing_place= NO_MATTER;
             if ($3)
               $3->top_level_item();
@@ -9239,7 +9239,7 @@ having_clause:
           expr
           {
             SELECT_LEX *sel= Select;
-            sel->having= $3;
+            sel->having= normalize_cond($3);
             sel->parsing_place= NO_MATTER;
             if ($3)
               $3->top_level_item();
@@ -10706,7 +10706,7 @@ wild_and_where:
           }
         | WHERE expr
           {
-            Select->where= $2;
+            Select->where= normalize_cond($2);
             if ($2)
               $2->top_level_item();
           }