Don't cancel finished queries

When closing query rows, if the current segment is the last one (there's
no next URI), don't cancel the query. This does not apply to spooled
segments.

Author: nineinchnick

trino/trino.go

@@ -1515,6 +1515,9 @@ func (qr *driverRows) Close() error {
 		return nil
 	}
 	qr.err = io.EOF
+	if !qr.stmt.usingSpooledProtocol && qr.nextURI == "" {
+		return qr.err
+	}
 	hs := make(http.Header)
 	if qr.stmt.user != "" {
 		hs.Add(trinoUserHeader, qr.stmt.user)
@@ -1973,6 +1976,7 @@ func (qr *driverRows) fetch() error {
 			}
 
 			qr.rowindex = 0
+			qr.nextURI = qresp.NextURI
 			switch data := qresp.Data.(type) {
 			case []interface{}:
 				// direct protocol