BUG#1000051: Query with simple join and ORDER BY takes thousands times longer when run with ICP

- Disable IndexConditionPushdown for reverse scans.

mysql-test/r/maria_icp.result

@@ -167,7 +167,7 @@ WHERE ts BETWEEN '0000-00-00' AND '2010-00-01 00:00:00'
 ORDER BY ts DESC
 LIMIT 2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	PRIMARY	PRIMARY	4	NULL	4	Using index condition
+1	SIMPLE	t1	range	PRIMARY	PRIMARY	4	NULL	4	Using where
 
 DROP TABLE t1;
 #

mysql-test/r/myisam_icp.result

@@ -165,7 +165,7 @@ WHERE ts BETWEEN '0000-00-00' AND '2010-00-01 00:00:00'
 ORDER BY ts DESC
 LIMIT 2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	PRIMARY	PRIMARY	4	NULL	4	Using index condition
+1	SIMPLE	t1	range	PRIMARY	PRIMARY	4	NULL	4	Using where
 
 DROP TABLE t1;
 #
@@ -909,4 +909,21 @@ c	NULL	NULL
 c	NULL	NULL
 SET optimizer_switch=@save_optimizer_switch;
 DROP TABLE t1,t2,t3,t4;
+#
+# BUG#1000051: Query with simple join and ORDER BY takes thousands times longer when run with ICP
+#
+create table t0 (a int);
+insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
+create table t1 (a int, col int, filler char(100), key(a, col));
+insert into t1 select A.a + 10*B.a +100*C.a, 1234, 'filler' from t0 A, t0 B, t0 C;
+# Must not use ICP:
+explain select * from t1 where a between 10 and 20 order by a, col desc;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	range	a	a	5	NULL	11	Using index condition; Rowid-ordered scan; Using filesort
+# Must not use ICP:
+explain select * from t0,t1 where t1.a=t0.a and t1.col<123;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t0	ALL	NULL	NULL	NULL	NULL	10	Using where
+1	SIMPLE	t1	ref	a	a	5	test.t0.a	1	Using index condition
+drop table t0, t1;
 set optimizer_switch=@myisam_icp_tmp;

mysql-test/r/subselect.result

@@ -3100,7 +3100,7 @@ ON r.a = (SELECT t2.a FROM t2 WHERE t2.c = t1.a AND t2.b <= '359899'
 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	eq_ref	PRIMARY	PRIMARY	4	const	1	Using where
-2	DEPENDENT SUBQUERY	t2	range	b	b	40	NULL	2	Using index condition
+2	DEPENDENT SUBQUERY	t2	range	b	b	40	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;

mysql-test/r/subselect_no_mat.result

@@ -3106,7 +3106,7 @@ ON r.a = (SELECT t2.a FROM t2 WHERE t2.c = t1.a AND t2.b <= '359899'
 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	eq_ref	PRIMARY	PRIMARY	4	const	1	Using where
-2	DEPENDENT SUBQUERY	t2	range	b	b	40	NULL	2	Using index condition
+2	DEPENDENT SUBQUERY	t2	range	b	b	40	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;

mysql-test/r/subselect_no_opts.result

@@ -3102,7 +3102,7 @@ ON r.a = (SELECT t2.a FROM t2 WHERE t2.c = t1.a AND t2.b <= '359899'
 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	eq_ref	PRIMARY	PRIMARY	4	const	1	Using where
-2	DEPENDENT SUBQUERY	t2	range	b	b	40	NULL	2	Using index condition
+2	DEPENDENT SUBQUERY	t2	range	b	b	40	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;

mysql-test/r/subselect_no_scache.result

@@ -3106,7 +3106,7 @@ ON r.a = (SELECT t2.a FROM t2 WHERE t2.c = t1.a AND t2.b <= '359899'
 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	eq_ref	PRIMARY	PRIMARY	4	const	1	Using where
-2	DEPENDENT SUBQUERY	t2	range	b	b	40	NULL	2	Using index condition
+2	DEPENDENT SUBQUERY	t2	range	b	b	40	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;

mysql-test/r/subselect_no_semijoin.result

@@ -3102,7 +3102,7 @@ ON r.a = (SELECT t2.a FROM t2 WHERE t2.c = t1.a AND t2.b <= '359899'
 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	eq_ref	PRIMARY	PRIMARY	4	const	1	Using where
-2	DEPENDENT SUBQUERY	t2	range	b	b	40	NULL	2	Using index condition
+2	DEPENDENT SUBQUERY	t2	range	b	b	40	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;

mysql-test/t/myisam_icp.test

@@ -262,5 +262,22 @@ SET optimizer_switch=@save_optimizer_switch;
 
 DROP TABLE t1,t2,t3,t4;
 
+--echo #
+--echo # BUG#1000051: Query with simple join and ORDER BY takes thousands times longer when run with ICP
+--echo #
+create table t0 (a int);
+insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
+
+create table t1 (a int, col int, filler char(100), key(a, col));
+insert into t1 select A.a + 10*B.a +100*C.a, 1234, 'filler' from t0 A, t0 B, t0 C;
+
+--echo # Must not use ICP:
+explain select * from t1 where a between 10 and 20 order by a, col desc;
+
+--echo # Must not use ICP:
+explain select * from t0,t1 where t1.a=t0.a and t1.col<123;
+
+drop table t0, t1;
+
 set optimizer_switch=@myisam_icp_tmp;
 

sql/sql_select.cc

@@ -18548,6 +18548,15 @@ check_reverse_order:
           tab->limit= 0;
           goto use_filesort;           // Reverse sort failed -> filesort
         }
+        /*
+          Cancel Pushed Index Condition, as it doesn't work for reverse scans.
+        */
+        if (tab->select && tab->select->pre_idx_push_select_cond)
+	{
+          tab->set_cond(tab->select->pre_idx_push_select_cond);
+           tab->table->file->cancel_pushed_idx_cond();
+        }
+
         select->quick= tmp;
       }
       else if (tab->type != JT_NEXT && tab->type != JT_REF_OR_NULL &&
@@ -18561,6 +18570,14 @@ check_reverse_order:
         */
         tab->read_first_record= join_read_last_key;
         tab->read_record.read_record= join_read_prev_same;
+        /*
+          Cancel Pushed Index Condition, as it doesn't work for reverse scans.
+        */
+        if (tab->select && tab->select->pre_idx_push_select_cond)
+	{
+          tab->set_cond(tab->select->pre_idx_push_select_cond);
+           tab->table->file->cancel_pushed_idx_cond();
+        }
       }
     }
     else if (select && select->quick)