orm.go
func NewPQLRowsQuery(pql string, index *Index, err error) *PQLRowsQuery {
	return &PQLRowsQuery{
		index: index,
		pql:   pql,
		err:   err,
	}
}
func NewPQLRowsQuery(pql string, index *Index, err error) *PQLRowsQuery {
	return &PQLRowsQuery{
		index: index,
		pql:   pql,
		err:   err,
	}
}
// NewPQLRowsQuery creates a new PQLRowsQuery.