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bc9993a549
IN and NOT IN work fine on records and arrays, so just say that they accept "expressions" not "scalar expressions". I think that that phrasing was meant to say that they don't work on set-returning expressions, but that's not the common meaning of "scalar". Revise the description of row-constructor comparisons to make it perhaps a bit less confusing. (This partially reverts some dubious wording changes made by commit f56651519.) Per gripe from Ilya Nenashev. Back-patch to supported branches. In HEAD and v16, also drop a NOTE about pre-8.2 behavior, which is hopefully no longer of interest to anybody. Discussion: https://postgr.es/m/168968062460.632.14303906825812821399@wrigleys.postgresql.org