int32_t DecimalSize()

in src/parquet/arrow/schema.cc [635:701]

• 66 lines of code
• 39 McCabe index (conditional complexity)

int32_t DecimalSize(int32_t precision) {
  DCHECK_GE(precision, 1) << "decimal precision must be greater than or equal to 1, got "
                          << precision;
  DCHECK_LE(precision, 38) << "decimal precision must be less than or equal to 38, got "
                           << precision;

  switch (precision) {
    case 1:
    case 2:
      return 1;  // 127
    case 3:
    case 4:
      return 2;  // 32,767
    case 5:
    case 6:
      return 3;  // 8,388,607
    case 7:
    case 8:
    case 9:
      return 4;  // 2,147,483,427
    case 10:
    case 11:
      return 5;  // 549,755,813,887
    case 12:
    case 13:
    case 14:
      return 6;  // 140,737,488,355,327
    case 15:
    case 16:
      return 7;  // 36,028,797,018,963,967
    case 17:
    case 18:
      return 8;  // 9,223,372,036,854,775,807
    case 19:
    case 20:
    case 21:
      return 9;  // 2,361,183,241,434,822,606,847
    case 22:
    case 23:
      return 10;  // 604,462,909,807,314,587,353,087
    case 24:
    case 25:
    case 26:
      return 11;  // 154,742,504,910,672,534,362,390,527
    case 27:
    case 28:
      return 12;  // 39,614,081,257,132,168,796,771,975,167
    case 29:
    case 30:
    case 31:
      return 13;  // 10,141,204,801,825,835,211,973,625,643,007
    case 32:
    case 33:
      return 14;  // 2,596,148,429,267,413,814,265,248,164,610,047
    case 34:
    case 35:
      return 15;  // 664,613,997,892,457,936,451,903,530,140,172,287
    case 36:
    case 37:
    case 38:
      return 16;  // 170,141,183,460,469,231,731,687,303,715,884,105,727
    default:
      break;
  }
  DCHECK(false);
  return -1;
}