"SAVEPOINT" fails after a first successfull released savepoint.

[Alexandre Freire da Silva]

When using PBXT as a table's engine and also using SAVEPOINT, the second release call will fail. We believe that since PBXT doesn't support SAVEPOINT it should not raise an ERROR.

Here is a way to reproduce the bug (we used mysql console client):

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mysql> create database pbxt_savepoint;
Query OK, 1 row affected (0,00 sec)

mysql> use pbxt_savepoint;
Database changed

mysql> create table pbxt_table (name varchar(80)) engine=pbxt;
Query OK, 0 rows affected (0,18 sec)

mysql> show tables;
+--------------------------+
| Tables_in_pbxt_savepoint |
+--------------------------+
| pbxt_table |
+--------------------------+
1 row in set (0,00 sec)

mysql> show table status;
+------------+--------+---------+------------+------+----------------+-------------+-----------------+--------------+-----------+----------------+-------------+-------------+------------+-------------------+----------+----------------+---------+
| Name | Engine | Version | Row_format | Rows | Avg_row_length | Data_length | Max_data_length | Index_length | Data_free | Auto_increment | Create_time | Update_time | Check_time | Collation | Checksum | Create_options | Comment |
+------------+--------+---------+------------+------+----------------+-------------+-----------------+--------------+-----------+----------------+-------------+-------------+------------+-------------------+----------+----------------+---------+
| pbxt_table | PBXT | 10 | Dynamic | 0 | 96 | 1024 | 16777215 | 4096 | 0 | NULL | NULL | NULL | NULL | latin1_swedish_ci | NULL | | |
+------------+--------+---------+------------+------+----------------+-------------+-----------------+--------------+-----------+----------------+-------------+-------------+------------+-------------------+----------+----------------+---------+
1 row in set (0,00 sec)

mysql> begin;
Query OK, 0 rows affected (0,00 sec)

mysql> savepoint here;
Query OK, 0 rows affected (0,00 sec)

mysql> insert into pbxt_table (name) values ('name');
Query OK, 1 row affected (0,00 sec)

mysql> release savepoint here;
Query OK, 0 rows affected (0,00 sec)

mysql> savepoint here;
ERROR 1178 (42000): The storage engine for the table doesn't support SAVEPOINT
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