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my_decimal *val_decimal(my_decimal *);
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int save_in_field(Field *field, bool no_conversions);
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int save_safe_in_field(Field *field);
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enum Item_result result_type () const { return STRING_RESULT; }
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enum_field_types field_type() const { return DRIZZLE_TYPE_NULL; }
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bool basic_const_item() const { return 1; }