Merge dl145s.mysql.com:/data/bk/team_tree_merge/MERGE/mysql-4.1-opt

into  dl145s.mysql.com:/data/bk/team_tree_merge/MERGE/mysql-5.0-opt

mysql-test/r/subselect.result

@@ -2937,6 +2937,35 @@ retailerID	statusID	changed
 0048	1	2006-01-06 12:37:50
 0059	1	2006-01-06 12:37:50
 drop table t1;
+create table t1(a int, primary key (a));
+insert into t1 values (10);
+create table t2 (a int primary key, b varchar(32), c int, unique key b(c, b));
+insert into t2(a, c, b) values (1,10,'359'), (2,10,'35988'), (3,10,'35989');
+explain SELECT sql_no_cache t1.a, r.a, r.b FROM t1 LEFT JOIN t2 r 
+ON r.a = (SELECT t2.a FROM t2 WHERE t2.c = t1.a AND t2.b <= '359899' 
+ORDER BY t2.c DESC, t2.b DESC LIMIT 1) WHERE t1.a = 10;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t1	system	PRIMARY	NULL	NULL	NULL	1	
+1	PRIMARY	r	const	PRIMARY	PRIMARY	4	const	1	
+2	DEPENDENT SUBQUERY	t2	range	b	b	38	NULL	2	Using where
+SELECT sql_no_cache t1.a, r.a, r.b FROM t1 LEFT JOIN t2 r 
+ON r.a = (SELECT t2.a FROM t2 WHERE t2.c = t1.a AND t2.b <= '359899' 
+ORDER BY t2.c DESC, t2.b DESC LIMIT 1) WHERE t1.a = 10;
+a	a	b
+10	3	35989
+explain SELECT sql_no_cache t1.a, r.a, r.b FROM t1 LEFT JOIN t2 r 
+ON r.a = (SELECT t2.a FROM t2 WHERE t2.c = t1.a AND t2.b <= '359899' 
+ORDER BY t2.c, t2.b LIMIT 1) WHERE t1.a = 10;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	t1	system	PRIMARY	NULL	NULL	NULL	1	
+1	PRIMARY	r	const	PRIMARY	PRIMARY	4	const	1	
+2	DEPENDENT SUBQUERY	t2	range	b	b	38	NULL	2	Using where
+SELECT sql_no_cache t1.a, r.a, r.b FROM t1 LEFT JOIN t2 r 
+ON r.a = (SELECT t2.a FROM t2 WHERE t2.c = t1.a AND t2.b <= '359899' 
+ORDER BY t2.c, t2.b LIMIT 1) WHERE t1.a = 10;
+a	a	b
+10	1	359
+drop table t1,t2;
 create table t1 (df decimal(5,1));
 insert into t1 values(1.1);
 insert into t1 values(2.2);

mysql-test/t/subselect.test

@@ -1892,6 +1892,32 @@ select * from t1 r1
           group by r2.retailerId);
 drop table t1;
 
+#
+# Bug #21180: Subselect with index for both WHERE and ORDER BY 
+#             produces empty result
+#
+create table t1(a int, primary key (a));
+insert into t1 values (10);
+
+create table t2 (a int primary key, b varchar(32), c int, unique key b(c, b));
+insert into t2(a, c, b) values (1,10,'359'), (2,10,'35988'), (3,10,'35989');
+
+explain SELECT sql_no_cache t1.a, r.a, r.b FROM t1 LEFT JOIN t2 r 
+  ON r.a = (SELECT t2.a FROM t2 WHERE t2.c = t1.a AND t2.b <= '359899' 
+             ORDER BY t2.c DESC, t2.b DESC LIMIT 1) WHERE t1.a = 10;
+SELECT sql_no_cache t1.a, r.a, r.b FROM t1 LEFT JOIN t2 r 
+  ON r.a = (SELECT t2.a FROM t2 WHERE t2.c = t1.a AND t2.b <= '359899' 
+            ORDER BY t2.c DESC, t2.b DESC LIMIT 1) WHERE t1.a = 10;
+
+explain SELECT sql_no_cache t1.a, r.a, r.b FROM t1 LEFT JOIN t2 r 
+  ON r.a = (SELECT t2.a FROM t2 WHERE t2.c = t1.a AND t2.b <= '359899' 
+            ORDER BY t2.c, t2.b LIMIT 1) WHERE t1.a = 10;
+SELECT sql_no_cache t1.a, r.a, r.b FROM t1 LEFT JOIN t2 r 
+  ON r.a = (SELECT t2.a FROM t2 WHERE t2.c = t1.a AND t2.b <= '359899' 
+            ORDER BY t2.c, t2.b LIMIT 1) WHERE t1.a = 10;
+
+drop table t1,t2;
+
 # End of 4.1 tests
 
 #

sql/opt_range.cc

@@ -6724,6 +6724,14 @@ int QUICK_RANGE_SELECT::get_next()
   }
 }
 
+void QUICK_SELECT::reset(void) 
+{
+  next= 0; 
+  it.rewind();
+  range= 0; 
+  if (file->inited == handler::NONE) 
+    file->ha_index_init(index);
+}
 
 /*
   Get the next record with a different prefix.
@@ -9378,6 +9386,11 @@ static void print_ror_scans_arr(TABLE *table, const char *msg,
   DBUG_VOID_RETURN;
 }
 
+void QUICK_SELECT_DESC::reset(void)
+{ 
+  rev_it.rewind();
+  QUICK_SELECT::reset();
+}
 
 /*****************************************************************************
 ** Print a quick range for debugging

sql/opt_range.h

@@ -668,7 +668,7 @@ private:
 #ifdef NOT_USED
   bool test_if_null_range(QUICK_RANGE *range, uint used_key_parts);
 #endif
-  int reset(void) { rev_it.rewind(); return QUICK_RANGE_SELECT::reset(); }
+  void reset(void);
   List<QUICK_RANGE> rev_ranges;
   List_iterator<QUICK_RANGE> rev_it;
 };