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Doc: improve description of IN and row-constructor comparisons.
IN and NOT IN work fine on records and arrays, so just say thatthey accept "expressions" not "scalar expressions". I think thatthat phrasing was meant to say that they don't work on set-returningexpressions, but that's not the common meaning of "scalar".Revise the description of row-constructor comparisons to make itperhaps a bit less confusing. (This partially reverts somedubious wording changes made by commitf566515.)Per gripe from Ilya Nenashev. Back-patch to supported branches.In HEAD and v16, also drop a NOTE about pre-8.2 behavior, whichis hopefully no longer of interest to anybody.Discussion:https://postgr.es/m/168968062460.632.14303906825812821399@wrigleys.postgresql.org1 parentdc2d9ef commit27e9459
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