Don't cancel finished queries with spooling

When using spooling, wait up to 100ms to see if there's any more data to
process. If there are no more query results, the query does not need to
be cancelled.

Author: nineinchnick

trino/trino.go

@@ -1515,8 +1515,24 @@ func (qr *driverRows) Close() error {
 		return nil
 	}
 	qr.err = io.EOF
-	if !qr.stmt.usingSpooledProtocol && qr.nextURI == "" {
-		return qr.err
+	if !qr.stmt.usingSpooledProtocol {
+		err := qr.fetch()
+		if err != nil && err != io.EOF {
+			return err
+		}
+		if qr.nextURI == "" {
+			return nil
+		}
+	} else {
+		select {
+		case _, ok := <-qr.stmt.spoolingRowsChannel:
+			if !ok {
+				// channel is closed, all data has been consumed
+				return nil
+			}
+		case <-time.NewTimer(100 * time.Millisecond).C:
+			// no data is ready
+		}
 	}
 	hs := make(http.Header)
 	if qr.stmt.user != "" {