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drizzled/item/sum.cc
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  aggr_sel= NULL;
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  max_arg_level= -1;
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  max_sum_func_level= -1;
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  outer_fields.empty();
 
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  outer_fields.clear();
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  return false;
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}
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        select the field belongs to. If there are some then an error is
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        raised.
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    */
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    List_iterator<Item_field> of(outer_fields);
 
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    List<Item_field>::iterator of(outer_fields);
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    while ((field= of++))
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    {
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      Select_Lex *sel= field->cached_table->select_lex;
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    }
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  }
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  mark_as_sum_func();
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  list.empty();                                 // Fields are used
 
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  list.clear();                                 // Fields are used
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}
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