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Viewing changes to drizzled/sql_derived.cc

  • Committer: Brian Aker
  • Date: 2009-02-10 00:14:40 UTC
  • Revision ID: brian@tangent.org-20090210001440-qjg8eofh3h93064b
Adding Multi-threaded Scheduler into the system.

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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/server_includes.h>
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#include <drizzled/sql_select.h>
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#include <drizzled/session.h>
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namespace drizzled
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{
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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
 
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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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  {
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    lex->session->derived_tables_processing= true;
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    for (Select_Lex *sl= lex->all_selects_list; sl; sl= sl->next_select_in_list())
 
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    for (Select_Lex *sl= lex->all_selects_list;
 
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         sl;
 
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         sl= sl->next_select_in_list())
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    {
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      for (TableList *cursor= sl->get_table_list(); cursor; cursor= cursor->next_local)
 
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      for (TableList *cursor= sl->get_table_list();
 
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           cursor;
 
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           cursor= cursor->next_local)
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      {
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        if ((res= (*processor)(lex->session, lex, cursor)))
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          goto out;
 
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        if ((res= (*processor)(lex->session, lex, cursor)))
 
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          goto out;
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      }
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      if (lex->describe)
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      {
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        /*
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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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        /*
 
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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|= 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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  return res;
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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 *,
 
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                           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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    if ((res= unit->prepare(session, derived_result, 0)))
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      goto exit;
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    create_options= (first_select->options | session->options | TMP_TABLE_ALL_COLUMNS);
 
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    create_options= (first_select->options | session->options |
 
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                     TMP_TABLE_ALL_COLUMNS);
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    /*
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      Temp table is created so that it hounours if UNION without ALL is to be
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      processed
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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= NON_TRANSACTIONAL_TMP_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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      // Force read of table stats in the optimizer
 
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      table->file->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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  return(res);
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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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    Select_Lex *save_current_select= lex->current_select;
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    if (unit->is_union())
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    {
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      /* execute union without clean up */
 
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      // execute union without clean up
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      res= unit->exec();
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    }
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    else
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    {
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      unit->set_limit(first_select);
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      if (unit->select_limit_cnt == HA_POS_ERROR)
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              first_select->options&= ~OPTION_FOUND_ROWS;
 
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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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                        (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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                        first_select->having,
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                        (first_select->options | session->options | SELECT_NO_UNLOCK),
225
 
                        derived_result, unit, first_select);
 
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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_st *) first_select->order_list.first,
 
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                        (order_st *) first_select->group_list.first,
 
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                        first_select->having, (order_st*) NULL,
 
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                        (first_select->options | session->options |
 
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                         SELECT_NO_UNLOCK),
 
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                        derived_result, unit, first_select);
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236
    }
227
237
 
228
 
    if (! res)
 
238
    if (!res)
229
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    {
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      /*
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        Here we entirely fix both TableList and list of SELECT's as
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      if (derived_result->flush())
235
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        res= true;
236
246
 
237
 
      if (! lex->describe)
 
247
      if (!lex->describe)
238
248
        unit->cleanup();
239
249
    }
240
250
    else
243
253
  }
244
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  return res;
245
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}
246
 
 
247
 
} /* namespace drizzled */