Fixed bug #33697.

When the function test_if_skip_sort_order prefers index backward scan 
to ref access the corresponding access functions must be set accordingly.


mysql-test/include/mix1.inc:
  Added a test case for bug #33697.
  Corrected one previous bad merge.
mysql-test/r/innodb_mysql.result:
  Added a test case for bug #33697.
mysql-test/t/disabled.def:
  Turned innodb_mysql test on.

mysql-test/include/mix1.inc

@@ -723,20 +723,6 @@ set @@sort_buffer_size=default;
 
 DROP TABLE t1,t2;
 
-#
-# Bug #32815: query with ORDER BY and a possible ref_or_null access
-#
-
-CREATE TABLE t1 (id int, type char(6), d int, INDEX idx(id,d)) ENGINE=InnoDB;
-INSERT INTO t1 VALUES 
-  (191, 'member', 1), (NULL, 'member', 3), (NULL, 'member', 4), (201, 'member', 2); 
-
-EXPLAIN SELECT * FROM t1 WHERE id=191 OR id IS NULL ORDER BY d;
-SELECT * FROM t1 WHERE id=191 OR id IS NULL ORDER BY d;
-
-DROP TABLE t1;
-
-
 # Test of behaviour with CREATE ... SELECT
 #
 
@@ -1091,6 +1077,19 @@ desc t1;
 show create table t1;
 drop table t1;
 
+#
+# Bug #32815: query with ORDER BY and a possible ref_or_null access
+#
+
+CREATE TABLE t1 (id int, type char(6), d int, INDEX idx(id,d)) ENGINE=InnoDB;
+INSERT INTO t1 VALUES 
+  (191, 'member', 1), (NULL, 'member', 3), (NULL, 'member', 4), (201, 'member', 2); 
+
+EXPLAIN SELECT * FROM t1 WHERE id=191 OR id IS NULL ORDER BY d;
+SELECT * FROM t1 WHERE id=191 OR id IS NULL ORDER BY d;
+
+DROP TABLE t1;
+
 --echo End of 5.0 tests
 
 # Fix for BUG#19243 "wrong LAST_INSERT_ID() after ON DUPLICATE KEY
@@ -1383,4 +1382,32 @@ create table t1 (a int auto_increment primary key) engine=innodb;
 alter table t1 order by a;
 drop table t1;
 
+#
+# Bug #33697: ORDER BY primary key DESC vs. ref access + filesort
+# (reproduced only with InnoDB tables)
+#
+
+CREATE TABLE t1
+  (vid integer NOT NULL,
+   tid integer NOT NULL,
+   idx integer NOT NULL,
+   name varchar(128) NOT NULL,
+   type varchar(128) NULL,
+   PRIMARY KEY(idx, vid, tid),
+   UNIQUE(vid, tid, name)
+) ENGINE=InnoDB;
+
+INSERT INTO t1 VALUES
+  (1,1,1,'pk',NULL),(2,1,1,'pk',NULL),(3,1,1,'pk',NULL),(4,1,1,'c1',NULL),
+  (5,1,1,'pk',NULL),(1,1,2,'c1',NULL),(2,1,2,'c1',NULL),(3,1,2,'c1',NULL),
+  (4,1,2,'c2',NULL),(5,1,2,'c1',NULL),(2,1,3,'c2',NULL),(3,1,3,'c2',NULL),
+  (4,1,3,'pk',NULL),(5,1,3,'c2',NULL),
+  (2,1,4,'c_extra',NULL),(3,1,4,'c_extra',NULL);
+
+EXPLAIN SELECT * FROM t1 WHERE tid = 1 AND vid = 3 ORDER BY idx DESC;
+
+SELECT * FROM t1 WHERE tid = 1 AND vid = 3 ORDER BY idx DESC;
+
+DROP TABLE t1;
+
 --echo End of 5.1 tests

mysql-test/r/innodb_mysql.result

@@ -1349,7 +1349,7 @@ INSERT INTO t1 VALUES
 (191, 'member', 1), (NULL, 'member', 3), (NULL, 'member', 4), (201, 'member', 2);
 EXPLAIN SELECT * FROM t1 WHERE id=191 OR id IS NULL ORDER BY d;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	ALL	idx	NULL	NULL	NULL	3	Using where; Using filesort
+1	SIMPLE	t1	ALL	idx	NULL	NULL	NULL	4	Using where; Using filesort
 SELECT * FROM t1 WHERE id=191 OR id IS NULL ORDER BY d;
 id	type	d
 191	member	1
@@ -1609,4 +1609,29 @@ alter table t1 order by a;
 Warnings:
 Warning	1105	ORDER BY ignored as there is a user-defined clustered index in the table 't1'
 drop table t1;
+CREATE TABLE t1
+(vid integer NOT NULL,
+tid integer NOT NULL,
+idx integer NOT NULL,
+name varchar(128) NOT NULL,
+type varchar(128) NULL,
+PRIMARY KEY(idx, vid, tid),
+UNIQUE(vid, tid, name)
+) ENGINE=InnoDB;
+INSERT INTO t1 VALUES
+(1,1,1,'pk',NULL),(2,1,1,'pk',NULL),(3,1,1,'pk',NULL),(4,1,1,'c1',NULL),
+(5,1,1,'pk',NULL),(1,1,2,'c1',NULL),(2,1,2,'c1',NULL),(3,1,2,'c1',NULL),
+(4,1,2,'c2',NULL),(5,1,2,'c1',NULL),(2,1,3,'c2',NULL),(3,1,3,'c2',NULL),
+(4,1,3,'pk',NULL),(5,1,3,'c2',NULL),
+(2,1,4,'c_extra',NULL),(3,1,4,'c_extra',NULL);
+EXPLAIN SELECT * FROM t1 WHERE tid = 1 AND vid = 3 ORDER BY idx DESC;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	index	vid	PRIMARY	12	NULL	16	Using where
+SELECT * FROM t1 WHERE tid = 1 AND vid = 3 ORDER BY idx DESC;
+vid	tid	idx	name	type
+3	1	4	c_extra	NULL
+3	1	3	c2	NULL
+3	1	2	c1	NULL
+3	1	1	pk	NULL
+DROP TABLE t1;
 End of 5.1 tests

mysql-test/t/disabled.def

@@ -18,7 +18,6 @@ federated_transactions   : Bug#29523 Transactions do not work
 events                   : Bug#32664 events.test fails randomly
 lowercase_table3         : Bug#32667 lowercase_table3.test reports to error log
 kill                 : Bug#29149: Test "kill" fails on Windows
-innodb_mysql         : Bug#32724: innodb_mysql.test fails randomly
 wait_timeout         : Bug#32801 wait_timeout.test fails randomly
 kill                 : Bug#29149 Test "kill" fails on Windows
 ctype_create         : Bug#32965 main.ctype_create fails

sql/sql_select.cc

@@ -13123,7 +13123,8 @@ test_if_skip_sort_order(JOIN_TAB *tab,ORDER *order,ha_rows select_limit,
 	select->quick=tmp;
       }
     }
-    else if (tab->ref.key >= 0 && tab->ref.key_parts <= used_key_parts)
+    else if (tab->type != JT_NEXT && 
+             tab->ref.key >= 0 && tab->ref.key_parts <= used_key_parts)
     {
       /*
 	SELECT * FROM t1 WHERE a=1 ORDER BY a DESC,b DESC