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drizzled/sql_select.cc
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  @file
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  @brief
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  mysql_select and join optimization
 
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  select_query and join optimization
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  @defgroup Query_Optimizer  Query Optimizer
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  @{
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static Item* part_of_refkey(Table *form,Field *field);
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static bool cmp_buffer_with_ref(JoinTable *tab);
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static void change_cond_ref_to_const(Session *session,
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                                     vector<COND_CMP>& save_list,
 
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                                     list<COND_CMP>& save_list,
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                                     Item *and_father,
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                                     Item *cond,
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                                     Item *field,
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    unit->set_limit(unit->global_parameters);
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    session->session_marker= 0;
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    /*
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      'options' of mysql_select will be set in JOIN, as far as JOIN for
 
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      'options' of select_query will be set in JOIN, as far as JOIN for
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      every PS/SP execution new, we will not need reset this flag if
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      setup_tables_done_option changed for next rexecution
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    */
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    res= mysql_select(session,
 
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    res= select_query(session,
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                      &select_lex->ref_pointer_array,
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                      (TableList*) select_lex->table_list.first,
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                      select_lex->with_wild,
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/*****************************************************************************
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  Check fields, find best join, do the select and output fields.
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  mysql_select assumes that all tables are already opened
 
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  select_query assumes that all tables are already opened
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*****************************************************************************/
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/*
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  @retval
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    true   an error
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*/
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bool mysql_select(Session *session,
 
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bool select_query(Session *session,
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                  Item ***rref_pointer_array,
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                  TableList *tables, 
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                  uint32_t wild_num, 
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  /*
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    we should restore old value of count_cuted_fields because
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    store_val_in_field can be called from mysql_insert
 
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    store_val_in_field can be called from insert_query
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    with select_insert, which make count_cuted_fields= 1
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   */
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  enum_check_fields old_count_cuted_fields= session->count_cuted_fields;
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  and_level
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*/
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static void change_cond_ref_to_const(Session *session,
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                                     vector<COND_CMP>& save_list,
 
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                                     list<COND_CMP>& save_list,
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                                     Item *and_father,
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                                     Item *cond,
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                                     Item *field,
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}
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static void propagate_cond_constants(Session *session, 
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                                     vector<COND_CMP>& save_list, 
 
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                                     list<COND_CMP>& save_list, 
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                                     COND *and_father, 
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                                     COND *cond)
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{
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    bool and_level= ((Item_cond*) cond)->functype() == Item_func::COND_AND_FUNC;
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    List_iterator_fast<Item> li(*((Item_cond*) cond)->argument_list());
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    Item *item;
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    vector<COND_CMP> save;
 
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    list<COND_CMP> save;
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    while ((item=li++))
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    {
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      propagate_cond_constants(session, save, and_level ? cond : item, item);
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    if (and_level)
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    {
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      // Handle other found items
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      for (vector<COND_CMP>::iterator iter= save.begin(); iter != save.end(); ++iter)
 
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      for (list<COND_CMP>::iterator iter= save.begin(); iter != save.end(); ++iter)
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      {
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        Item **args= iter->cmp_func->arguments();
 
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        Item **args= iter->second->arguments();
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        if (not args[0]->const_item())
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        {
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          change_cond_ref_to_const(session, save_list, iter->and_level,
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                                   iter->and_level, args[0], args[1] );
 
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          change_cond_ref_to_const(session, save, iter->first,
 
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                                   iter->first, args[0], args[1] );
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        }
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      }
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    }
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                             &join->cond_equal);
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    /* change field = field to field = const for each found field = const */
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    vector<COND_CMP> temp;
 
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    list<COND_CMP> temp;
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    propagate_cond_constants(session, temp, conds, conds);
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    /*
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      Remove all instances of item == item