private static string GetFormat()

in csharp/src/Apache.Arrow/C/CArrowSchemaExporter.cs [144:219]
64 lines of code
40 McCabe index (conditional complexity)

        private static string GetFormat(IArrowType datatype)
        {
            switch (datatype)
            {
                case NullType _: return "n";
                case BooleanType _: return "b";
                // Integers
                case Int8Type _: return "c";
                case UInt8Type _: return "C";
                case Int16Type _: return "s";
                case UInt16Type _: return "S";
                case Int32Type _: return "i";
                case UInt32Type _: return "I";
                case Int64Type _: return "l";
                case UInt64Type _: return "L";
                // Floats
                case HalfFloatType _: return "e";
                case FloatType _: return "f";
                case DoubleType _: return "g";
                // Decimal
                case Decimal32Type decimalType:
                    return $"d:{decimalType.Precision},{decimalType.Scale},32";
                case Decimal64Type decimalType:
                    return $"d:{decimalType.Precision},{decimalType.Scale},64";
                case Decimal128Type decimalType:
                    return $"d:{decimalType.Precision},{decimalType.Scale}";
                case Decimal256Type decimalType:
                    return $"d:{decimalType.Precision},{decimalType.Scale},256";
                // Binary
                case BinaryType _: return "z";
                case BinaryViewType _: return "vz";
                case LargeBinaryType _: return "Z";
                case StringType _: return "u";
                case StringViewType _: return "vu";
                case LargeStringType _: return "U";
                case FixedSizeBinaryType binaryType:
                    return $"w:{binaryType.ByteWidth}";
                // Date
                case Date32Type _: return "tdD";
                case Date64Type _: return "tdm";
                // Time
                case Time32Type timeType:
                    return String.Format("tt{0}", FormatTimeUnit(timeType.Unit));
                case Time64Type timeType:
                    // Same prefix as Time32, but allowed time units are different.
                    return String.Format("tt{0}", FormatTimeUnit(timeType.Unit));
                // Duration
                case DurationType durationType:
                    return String.Format("tD{0}", FormatTimeUnit(durationType.Unit));
                // Timestamp
                case TimestampType timestampType:
                    return String.Format("ts{0}:{1}", FormatTimeUnit(timestampType.Unit), timestampType.Timezone);
                // Interval
                case IntervalType intervalType:
                    return intervalType.Unit switch
                    {
                        IntervalUnit.YearMonth => "tiM",
                        IntervalUnit.DayTime => "tiD",
                        IntervalUnit.MonthDayNanosecond => "tin",
                        _ => throw new InvalidDataException($"Unsupported interval unit for export: {intervalType.Unit}"),
                    };
                // Nested
                case ListType _: return "+l";
                case ListViewType _: return "+vl";
                case LargeListType _: return "+L";
                case FixedSizeListType fixedListType:
                    return $"+w:{fixedListType.ListSize}";
                case StructType _: return "+s";
                case UnionType u: return FormatUnion(u);
                case MapType _: return "+m";
                // Dictionary
                case DictionaryType dictionaryType:
                    return GetFormat(dictionaryType.IndexType);
                default: throw new NotImplementedException($"Exporting {datatype.Name} not implemented");
            }
        }