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#ifndef MY_DECIMAL_LIMITS_INCLUDED
#define MY_DECIMAL_LIMITS_INCLUDED
/* Copyright (c) 2011 Monty Program Ab

This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA */

#define DECIMAL_LONGLONG_DIGITS 22
#define DECIMAL_LONG_DIGITS 10
#define DECIMAL_LONG3_DIGITS 8

/** maximum length of buffer in our big digits (uint32). */
#define DECIMAL_BUFF_LENGTH 9

/* the number of digits that my_decimal can possibly contain */
#define DECIMAL_MAX_POSSIBLE_PRECISION (DECIMAL_BUFF_LENGTH * 9)

/**
  maximum guaranteed precision of number in decimal digits (number of our
  digits * number of decimal digits in one our big digit - number of decimal
  digits in one our big digit decreased by 1 (because we always put decimal
  point on the border of our big digits))

With normal precision we can handle 65 digits. MariaDB can store in
  the .frm up to 63 digits.  By default we use DECIMAL_NOT_SPECIFIED digits
  when converting strings to decimal, so we don't want to set this too high.
  To not use up all digits for the scale we limit the number of decimals to
  38.
*/
#define DECIMAL_MAX_PRECISION (DECIMAL_MAX_POSSIBLE_PRECISION - 8*2)
#define DECIMAL_MAX_SCALE 38
#define DECIMAL_NOT_SPECIFIED 39

/**
  maximum length of string representation (number of maximum decimal
  digits + 1 position for sign + 1 position for decimal point, no terminator)
*/
#define DECIMAL_MAX_STR_LENGTH (DECIMAL_MAX_POSSIBLE_PRECISION + 2)

#endif /* MY_DECIMAL_LIMITS_INCLUDED */

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📝 my_decimal_limits.h

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