After run a sql in query editor first time.Modify 'Where rownum between ... and...', the card not changed in Query Explain.

1. Run '
SELECT
"firstone",
"secondtwo",
"addate"
FROM
"dzlautoinsertable"
WHERE
ROWNUM BETWEEN 1 AND 1000;', result record number is 1000.
2.Run '
SELECT
"firstone",
"secondtwo",
"addate"
FROM
"dzlautoinsertable"
WHERE
ROWNUM BETWEEN 1 AND 10000;',result record number is 8916.
3.In query explain, The card and cost are not changed. In the second display mode of query plan,The card and cost of second sql should be changed.