Remove make_sort from create_gather_merge_plan; error instead

When Who What
2021-01-17 01:39:41 Tomas Vondra (fuzzycz) Closed in commitfest 2021-01 with status: Committed
2021-01-17 01:39:41 Tomas Vondra (fuzzycz) Changed committer to fuzzycz
2021-01-15 20:47:16 Tom Lane (tgl) Removed tgl from reviewers
2020-12-01 00:12:30 James Coleman (jcole1989) Changed reviewers to Tom Lane (tgl), Tomas Vondra (fuzzycz)
2020-12-01 00:12:30 James Coleman (jcole1989) Changed authors to James Coleman (jcole1989)
2020-12-01 00:12:11 James Coleman (jcole1989) Attached mail thread CAAaqYe81TRdn0NrzEmhzeXGSbNyDNQQT3DcpOny=riVuJz8jvA@mail.gmail.com
2020-12-01 00:12:11 James Coleman (jcole1989) Created patch record