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Tweak BRIN minmax operator class
Alvaro Herrera authored 
In the union support proc, we were not checking the hasnulls flag of
value A early enough, so it could be skipped if the "allnulls" flag in
value B is set.  Also, a check on the allnulls flag of value "B" was
redundant, so remove it.

Also change inet_minmax_ops to not be the default opclass for type inet,
as a future inclusion operator class would be more useful and it's
pretty difficult to change default opclass for a datatype later on.
(There is no catversion bump for this catalog change; this shouldn't be
a problem.)

Extracted from a larger patch to add an "inclusion" operator class.

Author: Emre Hasegeli
972bf7d6
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