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bool basic_const_item() const { return 1; }
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String *val_str(String*) { assert(fixed == 1); return &str_value; }
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int save_in_field(Field *field, bool no_conversions);
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enum Item_result result_type () const { return STRING_RESULT; }
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enum Item_result cast_to_int_type() const { return INT_RESULT; }