Bug#25262 Auto Increment lost when changing Engine type

 - Try to copy the autoincrement value when altering the table


mysql-test/r/alter_table.result:
  Update test result
mysql-test/t/alter_table.test:
  Add test case as described in bug report
sql/sql_table.cc:
  Try to copy the autoincrement value when altering the table

1 files changed, 28 insertions, 0 deletions

diff --git a/mysql-test/t/alter_table.test b/mysql-test/t/alter_table.test
index 01f55931ca4..382790e00d0 100644
--- a/mysql-test/t/alter_table.test
+++ b/mysql-test/t/alter_table.test
@@ -613,3 +613,31 @@ create table t1 (t varchar(255) default null, key t (t(80)))
 engine=myisam default charset=latin1;
 alter table t1 change t t text;
 drop table t1;
+
+#
+# Bug#25262 Auto Increment lost when changing Engine type
+#
+
+create table t1(id int(8) primary key auto_increment) engine=heap;
+
+insert into t1 values (null);
+insert into t1 values (null);
+
+select * from t1;
+
+# Set auto increment to 50
+alter table t1 auto_increment = 50;
+
+# Alter to myisam
+alter table t1 engine = myisam;
+
+# This insert should get id 50
+insert into t1 values (null);
+select * from t1;
+
+# Alter to heap again
+alter table t1 engine = heap;
+insert into t1 values (null);
+select * from t1;
+
+drop table t1;