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drizzled/sql_select.cc
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    if (tmp)
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    {
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      tmp->collation.set(right_item->collation);
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      session->change_item_tree(args + 1, tmp);
 
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      args[1]= tmp;
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      func->update_used_tables();
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      if ((functype == Item_func::EQ_FUNC || functype == Item_func::EQUAL_FUNC) &&
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                and_father != cond && 
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    if (tmp)
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    {
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      tmp->collation.set(left_item->collation);
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      session->change_item_tree(args, tmp);
 
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      *args= tmp;
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      value= tmp;
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      func->update_used_tables();
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      if ((functype == Item_func::EQ_FUNC || functype == Item_func::EQUAL_FUNC) &&
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          ! right_item->const_item())
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      {
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        args[0]= args[1];                       // For easy check
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        session->change_item_tree(args + 1, value);
 
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        args[1]= value;
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        cond->marker=1;
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        save_list.push_back( COND_CMP(and_father, func) );
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      }
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            if (!(new_item= new Item_ref(context, group_tmp->item, 0,
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                                        item->name)))
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              return 1;                                 // fatal_error is set
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            session->change_item_tree(arg, new_item);
 
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            *arg= new_item;
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            arg_changed= true;
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          }
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        }