code: func convertLimitOffsetToCount(prop *requiredProperty) *requiredProperty {
  	ret := &requiredProperty{
  		props:      prop.props,
  		sortKeyLen: prop.sortKeyLen,
  	}
  	if prop.limit != nil {
  		ret.limit = &Limit{
  			Count: prop.limit.Offset + prop.limit.Count,
  		}
  	}
  	return ret
  }
docs: // convertLimitOffsetToCount changes the limit(offset, count) in prop to limit(0, offset + count).