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These options already exist, but you need to specify a column list for them, which can be cumbersome. We already have the possibility of all columns for FORCE QUOTE, so this is simply extending that facility to FORCE_NULL and FORCE_NOT_NULL. Author: Zhang Mingli Reviewed-By: Richard Guo, Kyatoro Horiguchi, Michael Paquier. Discussion: https://postgr.es/m/CACJufxEnVqzOFtqhexF2+AwOKFrV8zHOY3y=p+gPK6eB14pn_w@mail.gmail.com