Test of range optimizer in InnoDB

sql/ha_myisam.cc:
  Added function comment

mysql-test/r/innodb.result

-drop table if exists t1,t2;
+drop table if exists t1,t2,t3;
 create table t1 (id int unsigned not null auto_increment, code tinyint unsigned not null, name char(20) not null, primary key (id), key (code), unique (name)) type=innodb;
 insert into t1 (code, name) values (1, 'Tim'), (1, 'Monty'), (2, 'David'), (2, 'Erik'), (3, 'Sasha'), (3, 'Jeremy'), (4, 'Matt');
 select id, code, name from t1 order by id;
@@ -1091,3 +1091,34 @@ SELECT * from t1;
 id
 3
 DROP TABLE t1,t2;
+set autocommit=0;
+CREATE TABLE t1 (id CHAR(15) NOT NULL, value CHAR(40) NOT NULL, PRIMARY KEY(id)) TYPE=InnoDB;
+CREATE TABLE t2 (id CHAR(15) NOT NULL, value CHAR(40) NOT NULL, PRIMARY KEY(id)) TYPE=InnoDB;
+CREATE TABLE t3 (id1 CHAR(15) NOT NULL, id2 CHAR(15) NOT NULL, PRIMARY KEY(id1, id2)) TYPE=InnoDB;
+INSERT INTO t3 VALUES("my-test-1", "my-test-2");
+COMMIT;
+INSERT INTO t1 VALUES("this-key", "will disappear");
+INSERT INTO t2 VALUES("this-key", "will also disappear");
+DELETE FROM t3 WHERE id1="my-test-1";
+SELECT * FROM t1;
+id	value
+this-key	will disappear
+SELECT * FROM t2;
+id	value
+this-key	will also disappear
+SELECT * FROM t3;
+id1	id2
+ROLLBACK;
+SELECT * FROM t1;
+id	value
+SELECT * FROM t2;
+id	value
+SELECT * FROM t3;
+id1	id2
+my-test-1	my-test-2
+SELECT * FROM t3 WHERE id1="my-test-1" LOCK IN SHARE MODE;
+id1	id2
+my-test-1	my-test-2
+COMMIT;
+set autocommit=1;
+DROP TABLE t1,t2,t3;

mysql-test/t/innodb.test

@@ -4,7 +4,7 @@
 # Small basic test with ignore
 #
 
-drop table if exists t1,t2;
+drop table if exists t1,t2,t3;
 create table t1 (id int unsigned not null auto_increment, code tinyint unsigned not null, name char(20) not null, primary key (id), key (code), unique (name)) type=innodb;
 
 insert into t1 (code, name) values (1, 'Tim'), (1, 'Monty'), (2, 'David'), (2, 'Erik'), (3, 'Sasha'), (3, 'Jeremy'), (4, 'Matt');
@@ -726,3 +726,35 @@ SELECT * from t1;
 UPDATE t1,t2 SET t1.id=t1.id+1 where t1.id!=t2.id;
 SELECT * from t1;
 DROP TABLE t1,t2;
+
+#
+# Test of range_optimizer
+#
+
+set autocommit=0;
+
+CREATE TABLE t1 (id CHAR(15) NOT NULL, value CHAR(40) NOT NULL, PRIMARY KEY(id)) TYPE=InnoDB;
+
+CREATE TABLE t2 (id CHAR(15) NOT NULL, value CHAR(40) NOT NULL, PRIMARY KEY(id)) TYPE=InnoDB;
+
+CREATE TABLE t3 (id1 CHAR(15) NOT NULL, id2 CHAR(15) NOT NULL, PRIMARY KEY(id1, id2)) TYPE=InnoDB;
+
+INSERT INTO t3 VALUES("my-test-1", "my-test-2");
+COMMIT;
+
+INSERT INTO t1 VALUES("this-key", "will disappear");
+INSERT INTO t2 VALUES("this-key", "will also disappear");
+DELETE FROM t3 WHERE id1="my-test-1";
+
+SELECT * FROM t1;
+SELECT * FROM t2;
+SELECT * FROM t3;
+ROLLBACK;
+
+SELECT * FROM t1;
+SELECT * FROM t2;
+SELECT * FROM t3;
+SELECT * FROM t3 WHERE id1="my-test-1" LOCK IN SHARE MODE;
+COMMIT;
+set autocommit=1;
+DROP TABLE t1,t2,t3;

sql/ha_myisam.cc

@@ -1242,6 +1242,35 @@ longlong ha_myisam::get_auto_increment()
 }
 
 
+/*
+  Find out how many rows there is in the given range
+
+  SYNOPSIS
+    records_in_range()
+    inx			Index to use
+    start_key		Start of range.  Null pointer if from first key
+    start_key_len	Length of start key
+    start_search_flag	Flag if start key should be included or not
+    end_key		End of range. Null pointer if to last key
+    end_key_len		Length of end key
+    end_search_flag	Flag if start key should be included or not
+
+  NOTES
+    start_search_flag can have one of the following values:
+      HA_READ_KEY_EXACT		Include the key in the range
+      HA_READ_AFTER_KEY		Don't include key in range
+
+    end_search_flag can have one of the following values:  
+      HA_READ_BEFORE_KEY	Don't include key in range
+      HA_READ_AFTER_KEY		Include all 'end_key' values in the range
+
+  RETURN
+   HA_POS_ERROR		Something is wrong with the index tree.
+   0			There is no matching keys in the given range
+   number > 0		There is approximately 'number' matching rows in
+			the range.
+*/
+
 ha_rows ha_myisam::records_in_range(int inx,
 				    const byte *start_key,uint start_key_len,
 				    enum ha_rkey_function start_search_flag,
@@ -1256,6 +1285,7 @@ ha_rows ha_myisam::records_in_range(int inx,
 				       end_search_flag);
 }
 
+
 int ha_myisam::ft_read(byte * buf)
 {
   int error;