WITH TIES: number of rows is optional and defaults to one
FETCH FIRST .. ONLY implements this correctly, but we missed to include
it for FETCH FIRST .. WITH TIES in commit
357889eb17bb.
Author: Vik Fearing
Discussion: https://postgr.es/m/
6aa690ef-551d-e24f-2690-
c38c2442947c@postgresfriends.org