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Tom Lane authored
Get rid of the false implication that PRIMARY KEY is exactly equivalent to
UNIQUE + NOT NULL.  That was more-or-less true at one time in our
implementation, but the standard doesn't say that, and we've grown various
features (many of them required by spec) that treat a pkey differently from
less-formal constraints.  Per recent discussion on pgsql-general.

I failed to resist the temptation to do some other wordsmithing in the
same area.
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