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This patch completes the first step in the splitting of
the XA resource manager API from the storage engine API,
as outlined in the specification here:

http://drizzle.org/wiki/XaStorageEngine

* Splits plugin::StorageEngine into a base StorageEngine
  class and two derived classes, TransactionalStorageEngine
  and XaStorageEngine.  XaStorageEngine derives from
  TransactionalStorageEngine and creates the XA Resource
  Manager API for storage engines.

  - The methods moved from StorageEngine to TransactionalStorageEngine
    include releaseTemporaryLatches(), startConsistentSnapshot(), 
    commit(), rollback(), setSavepoint(), releaseSavepoint(),
    rollbackToSavepoint() and hasTwoPhaseCommit()
  - The methods moved from StorageEngine to XaStorageEngine
    include recover(), commitXid(), rollbackXid(), and prepare()

* Places all static "EngineVector"s into their proper
  namespaces (typedefs belong in header files, not implementation files)
  and places all static methods corresponding
  to either only transactional engines or only XA engines
  into their respective files in /drizzled/plugin/

* Modifies the InnoDB "handler" files to extend plugin::XaStorageEngine
  and not plugin::StorageEngine

The next step, as outlined in the wiki spec page above, is to isolate
the XA Resource Manager API into its own plugin class and modify
plugin::XaStorageEngine to implement plugin::XaResourceManager via
composition.  This is necessary to enable building plugins which can
participate in an XA transaction *without having to have that plugin
implement the entire storage engine API*

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drizzled/sql_derived.cc
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   You should have received a copy of the GNU General Public License
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   along with this program; if not, write to the Free Software
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   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA */
 
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   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
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/*
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  Derived tables
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  These were introduced by Sinisa <sinisa@mysql.com>
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*/
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#include <config.h>
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#include <drizzled/sql_lex.h>
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#include <drizzled/select_union.h>
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#include <drizzled/sql_select.h>
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#include <drizzled/session.h>
 
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#include "config.h"
 
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#include "drizzled/sql_select.h"
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namespace drizzled
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{
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  Call given derived table processor (preparing or filling tables)
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  SYNOPSIS
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    handle_derived()
 
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    mysql_handle_derived()
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    lex                 LEX for this thread
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    processor           procedure of derived table processing
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    false  OK
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    true   Error
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*/
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bool handle_derived(LEX *lex, bool (*processor)(Session*, LEX*, TableList*))
 
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bool mysql_handle_derived(LEX *lex, bool (*processor)(Session*, LEX*, TableList*))
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{
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  bool res= false;
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  if (lex->derived_tables)
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          Force join->join_tmp creation, because we will use this JOIN
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          twice for EXPLAIN and we have to have unchanged join for EXPLAINing
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        */
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        sl->uncacheable.set(UNCACHEABLE_EXPLAIN);
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        sl->master_unit()->uncacheable.set(UNCACHEABLE_EXPLAIN);
 
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        sl->uncacheable|= UNCACHEABLE_EXPLAIN;
 
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        sl->master_unit()->uncacheable|= UNCACHEABLE_EXPLAIN;
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      }
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    }
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  }
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  Create temporary table structure (but do not fill it)
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  SYNOPSIS
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    derived_prepare()
 
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    mysql_derived_prepare()
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    session                     Thread handle
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    lex                 LEX for this thread
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    orig_table_list     TableList for the upper SELECT
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    false  OK
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    true   Error
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*/
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bool derived_prepare(Session *session, LEX *, TableList *orig_table_list)
 
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bool mysql_derived_prepare(Session *session, LEX *, TableList *orig_table_list)
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{
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  Select_Lex_Unit *unit= orig_table_list->derived;
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  uint64_t create_options;
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    */
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    if ((res= derived_result->create_result_table(session, &unit->types, false,
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                                                  create_options,
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                                                  orig_table_list->alias)))
 
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                                                  orig_table_list->alias,
 
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                                                  false)))
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      goto exit;
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    table= derived_result->table;
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    if (res)
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    {
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      if (table)
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      {
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        table= 0;
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      }
 
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        table->free_tmp_table(session);
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      delete derived_result;
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    }
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    else
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    {
 
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      if (! session->fill_derived_tables())
 
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      {
 
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        delete derived_result;
 
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        derived_result= NULL;
 
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      }
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      orig_table_list->derived_result= derived_result;
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      orig_table_list->table= table;
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      orig_table_list->setTableName(const_cast<char *>(table->getShare()->getTableName()));
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      orig_table_list->table_name_length= table->getShare()->getTableNameSize();
 
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      orig_table_list->table_name=        table->s->table_name.str;
 
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      orig_table_list->table_name_length= table->s->table_name.length;
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      table->derived_select_number= first_select->select_number;
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      orig_table_list->setSchemaName((char *)"");
 
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      table->s->tmp_table= TEMP_TABLE;
 
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      orig_table_list->db= (char *)"";
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      orig_table_list->db_length= 0;
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      /* Force read of table stats in the optimizer */
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      table->cursor->info(HA_STATUS_VARIABLE);
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      /* Add new temporary table to list of open derived tables */
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      table->setNext(session->getDerivedTables());
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      session->setDerivedTables(table);
 
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      table->next= session->derived_tables;
 
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      session->derived_tables= table;
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    }
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  }
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  fill derived table
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  SYNOPSIS
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    derived_filling()
 
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    mysql_derived_filling()
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    session                     Thread handle
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    lex                 LEX for this thread
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    unit                node that contains all SELECT's for derived tables
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    false  OK
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    true   Error
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*/
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bool derived_filling(Session *session, LEX *lex, TableList *orig_table_list)
 
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bool mysql_derived_filling(Session *session, LEX *lex, TableList *orig_table_list)
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{
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  Table *table= orig_table_list->table;
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  Select_Lex_Unit *unit= orig_table_list->derived;
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              first_select->options&= ~OPTION_FOUND_ROWS;
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      lex->current_select= first_select;
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      res= select_query(session, &first_select->ref_pointer_array,
 
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      res= mysql_select(session, &first_select->ref_pointer_array,
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                        (TableList*) first_select->table_list.first,
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                        first_select->with_wild,
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                        first_select->item_list, first_select->where,
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                        (first_select->order_list.elements+
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                        first_select->group_list.elements),
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                        (Order *) first_select->order_list.first,
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                        (Order *) first_select->group_list.first,
 
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                        (order_st *) first_select->order_list.first,
 
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                        (order_st *) first_select->group_list.first,
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                        first_select->having,
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                        (first_select->options | session->options | SELECT_NO_UNLOCK),
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                        derived_result, unit, first_select);