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Item_sum_int(Session *session, Item_sum_int *item) :Item_sum_num(session, item) {}
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double val_real() { assert(fixed == 1); return (double) val_int(); }
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String *val_str(String*str);
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enum Item_result result_type () const { return INT_RESULT; }
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void fix_length_and_dec()
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{ decimals=0; max_length=21; maybe_null=null_value=0; }