branches/5.1: Reset the statement level autoinc counter on ROLLBACK. Fix

the test results too.
rb://164

handler/ha_innodb.cc

@@ -2123,6 +2123,8 @@ innobase_rollback(
 
 	innobase_release_stat_resources(trx);
 
+	trx->n_autoinc_rows = 0; /* Reset the number AUTO-INC rows required */
+
 	/* If we had reserved the auto-inc lock for some table (if
 	we come here to roll back the latest SQL statement) we
 	release it now before a possibly lengthy rollback */

mysql-test/innodb-autoinc.result

@@ -867,6 +867,7 @@ INSERT INTO t2 SELECT NULL FROM t1;
 Got one of the listed errors
 DROP TABLE t1;
 DROP TABLE t2;
+SET @@SESSION.AUTO_INCREMENT_INCREMENT=1, @@SESSION.AUTO_INCREMENT_OFFSET=1;
 CREATE TABLE t1 (c1 INT PRIMARY KEY AUTO_INCREMENT) ENGINE=InnoDB;
 INSERT INTO t1 VALUES (null);
 INSERT INTO t1 VALUES (null);
@@ -874,20 +875,26 @@ ALTER TABLE t1 CHANGE c1 d1 INT NOT NULL AUTO_INCREMENT;
 SELECT * FROM t1;
 d1
 1
-3
+2
 SELECT * FROM t1;
 d1
 1
-3
+2
 INSERT INTO t1 VALUES(null);
 ALTER TABLE t1 AUTO_INCREMENT = 3;
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `d1` int(11) NOT NULL AUTO_INCREMENT,
+  PRIMARY KEY (`d1`)
+) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=latin1
 INSERT INTO t1 VALUES(null);
 SELECT * FROM t1;
 d1
 1
+2
 3
 4
-5
 DROP TABLE t1;
 SET @@SESSION.AUTO_INCREMENT_INCREMENT=1, @@SESSION.AUTO_INCREMENT_OFFSET=1;
 SHOW VARIABLES LIKE "%auto_inc%";

mysql-test/innodb-autoinc.test

@@ -482,6 +482,7 @@ DROP TABLE t2;
 # 44030: Error: (1500) Couldn't read the MAX(ID) autoinc value from
 # the index (PRIMARY)
 # This test requires a restart of the server
+SET @@SESSION.AUTO_INCREMENT_INCREMENT=1, @@SESSION.AUTO_INCREMENT_OFFSET=1;
 CREATE TABLE t1 (c1 INT PRIMARY KEY AUTO_INCREMENT) ENGINE=InnoDB;
 INSERT INTO t1 VALUES (null);
 INSERT INTO t1 VALUES (null);
@@ -496,9 +497,10 @@ SELECT * FROM t1;
 # longer results in the two data dictionaries being out of sync. If they
 # revert their changes then this check for ER_AUTOINC_READ_FAILED will need
 # to be enabled.
-# -- error ER_AUTOINC_READ_FAILED,1467
+#-- error ER_AUTOINC_READ_FAILED,1467
 INSERT INTO t1 VALUES(null);
 ALTER TABLE t1 AUTO_INCREMENT = 3;
+SHOW CREATE TABLE t1;
 INSERT INTO t1 VALUES(null);
 SELECT * FROM t1;
 DROP TABLE t1;