Bug #30996 NDB commits too early when LOCK TABLE & SET AUTOCOMMIT=OFF are used together

Description:
NDB handler uses a buggy behavior in the usage
of trans_register_ha and commit in handler interface.

When autocommit is on when lock table is called then
a transaction isn't started when insert is done.
Then switch to autocommit off (or start a transaction
The insert statement causes a trans_register_ha to
be called with only statement level registration.
Later commit is called to the NDB handler to indicate
end-of-statement this however isn't handled by the NDB
handler and so the transaction is committed too early.

How to repeat:
TEST CASE:
----------
set autocommit=1;
create table t1 (a int) engine=ndb;
lock table t1 write;
set autocommit=0;
insert into t1 values (0);
rollback;
select * from t1;
/* Record is still there */
unlock tables;
drop table t1;

Suggested fix:
Fix handler

Documented bugfix in mysql-5.1.22-ndb-6.2.7 changelog. Left status as PA.

Also documented in mysql-5.1.22-ndb-6.3.4 changelog; left status as PA.

Pushed into 5.1.23-rc

Thank you for your bug report. This issue has been committed to our source repository of that product and will be incorporated into the next release.

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Also documented in 5.1.23 changelog. Closed.