orm.go
func (f *Field) RowsLimitColumn(limit int64, columnIDOrKey interface{}) *PQLRowsQuery {
	if limit < 0 {
		return NewPQLRowsQuery("", f.index, errors.New("rows limit must be non-negative"))
	}
	columnIDKey, err := formatIDKey(columnIDOrKey)
	if err != nil {
		return NewPQLRowsQuery("", f.index, err)
	}
	text := fmt.Sprintf("Rows(field='%s',limit=%d,column=%s)", f.name, limit, columnIDKey)
	return NewPQLRowsQuery(text, f.index, nil)
}
func (f *Field) RowsLimitColumn(limit int64, columnIDOrKey interface{}) *PQLRowsQuery {
	if limit < 0 {
		return NewPQLRowsQuery("", f.index, errors.New("rows limit must be non-negative"))
	}
	columnIDKey, err := formatIDKey(columnIDOrKey)
	if err != nil {
		return NewPQLRowsQuery("", f.index, err)
	}
	text := fmt.Sprintf("Rows(field='%s',limit=%d,column=%s)", f.name, limit, columnIDKey)
	return NewPQLRowsQuery(text, f.index, nil)
}
// RowsLimitColumn creates a Row query with the given limit and column ID/key