func PromoteType()

in types.go [711:749]
37 lines of code
17 McCabe index (conditional complexity)

func PromoteType(fileType, readType Type) (Type, error) {
	switch t := fileType.(type) {
	case Int32Type:
		if _, ok := readType.(Int64Type); ok {
			return readType, nil
		}
	case Float32Type:
		if _, ok := readType.(Float64Type); ok {
			return readType, nil
		}
	case StringType:
		if _, ok := readType.(BinaryType); ok {
			return readType, nil
		}
	case BinaryType:
		if _, ok := readType.(StringType); ok {
			return readType, nil
		}
	case DecimalType:
		if rt, ok := readType.(DecimalType); ok {
			if t.precision <= rt.precision && t.scale <= rt.scale {
				return readType, nil
			}

			return nil, fmt.Errorf("%w: cannot reduce precision from %s to %s",
				ErrResolve, fileType, readType)
		}
	case FixedType:
		if _, ok := readType.(UUIDType); ok && t.len == 16 {
			return readType, nil
		}
	default:
		if fileType.Equals(readType) {
			return fileType, nil
		}
	}

	return nil, fmt.Errorf("%w: cannot promote %s to %s", ErrResolve, fileType, readType)
}