fix validation in ALTER INDEX ... ALTER COLUMN ... SET

When Who What
2021-10-19 04:19:09 Michael Paquier (michael-kun) Closed in commitfest 2021-11 with status: Committed
2021-10-19 04:19:09 Michael Paquier (michael-kun) Changed committer to michael-kun
2021-10-13 00:08:59 Nathan Bossart (bossartn) Changed authors to Nathan Bossart (bossartn)
2021-10-13 00:08:59 Nathan Bossart (bossartn) Changed targetversion to stable
2021-10-13 00:08:30 Nathan Bossart (bossartn) Attached mail thread 17220-15d684c6c2171a83@postgresql.org
2021-10-13 00:08:30 Nathan Bossart (bossartn) Created patch record