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class Item_decimal :public Item_num
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Item_decimal(const char *str_arg, uint32_t length, const CHARSET_INFO * const charset);
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uint32_t decimal_par, uint32_t length);
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Item_decimal(int64_t val, bool unsig);
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Item_decimal(double val, int precision, int scale);
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Item_decimal(const unsigned char *bin, int precision, int scale);