BUG#19281: Auto-increment disappeared after create index

mysql-test/r/partition_list.result:
  New test case
mysql-test/t/partition_list.test:
  New test case
sql/ha_partition.cc:
  Implement a proper update_create_info

mysql-test/r/partition_list.result

@@ -191,3 +191,13 @@ SELECT COUNT(*) FROM t1 WHERE s1 < 3;
 COUNT(*)
 2
 DROP TABLE t1;
+create table t1 (a int auto_increment primary key)
+auto_increment=100
+partition by list (a)
+(partition p0 values in (1, 100));
+create index inx on t1 (a);
+insert into t1 values (null);
+select * from t1;
+a
+100
+drop table t1;

mysql-test/t/partition_list.test

@@ -124,3 +124,15 @@ INSERT INTO t1 VALUES (1), (2), (3), (4), (5);
 SELECT COUNT(*) FROM t1 WHERE s1 < 3;
 DROP TABLE t1;
 
+#
+# Bug 19281 Partitions: Auto-increment value lost
+#
+create table t1 (a int auto_increment primary key)
+auto_increment=100
+partition by list (a)
+(partition p0 values in (1, 100));
+create index inx on t1 (a);
+insert into t1 values (null);
+select * from t1;
+drop table t1;
+

sql/ha_partition.cc

@@ -1581,6 +1581,7 @@ error:
 
 void ha_partition::update_create_info(HA_CREATE_INFO *create_info)
 {
+  m_file[0]->update_create_info(create_info);
   return;
 }