promql/engine.go
func (q *query) Close() {
	for _, s := range q.matrix {
		putPointSlice(s.Points)
	}
}
func (q *query) Close() {
	for _, s := range q.matrix {
		putPointSlice(s.Points)
	}
}
func ( q * query ) Close ( ) { for _ , s := range q . matrix { putPointSlice ( s . Points ) } }
// Close implements the Query interface.
Close implements the Query interface .