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drizzled/item/field.cc
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            ;
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            if (!(rf= new Item_outer_ref(context, this)))
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              return -1;
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            session->change_item_tree(reference, rf);
 
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            *reference= rf;
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            select->inner_refs_list.push_back(rf);
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            rf->in_sum_func= session->getLex()->in_sum_func;
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          }
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      outer_context->select_lex->inner_refs_list.push_back((Item_outer_ref*)rf);
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      ((Item_outer_ref*)rf)->in_sum_func= session->getLex()->in_sum_func;
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    }
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    session->change_item_tree(reference, rf);
 
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    *reference= rf;
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    /*
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      rf is Item_ref => never substitute other items (in this case)
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      during fix_fields() => we can use rf after fix_fields()
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                       (char*) cached_table->alias, (char*) field_name);
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      if (!rf)
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        return -1;
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      session->change_item_tree(reference, rf);
 
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      *reference= rf;
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      /*
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        rf is Item_ref => never substitute other items (in this case)
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        during fix_fields() => we can use rf after fix_fields()
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            Item_ref *rf= new Item_ref(context, db_name,table_name,field_name);
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            if (!rf)
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              return 1;
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            session->change_item_tree(reference, rf);
 
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            *reference= rf;
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            /*
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              Because Item_ref never substitutes itself with other items
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              in Item_ref::fix_fields(), we can safely use the original