Patch from Michael Fuhr.

contradictory WHERE-clauses applied to a relation.  This makes the
GUC variable constraint_exclusion rather inappropriately named,
but I've refrained for the moment from renaming it.
Per example from Martin Lesser.

This doesn't matter too much for ordinary NOTs, since prepqual.c does
its best to get rid of those, but it helps with IS NOT TRUE clauses
which the rule rewriter likes to insert.  Per example from Martin Lesser.

that's shorter-lived than the expression state being evaluated in it really
doesn't work :-( --- we end up with fn_extra caches getting deleted while
still in use.  Rather than abandon the notion of caching expression state
across domain_in calls altogether, I chose to make domain_in a bit cozier
with ExprContext.  All we really need for evaluating variable-free
expressions is an ExprContext, not an EState, so I invented the notion of a
"standalone" ExprContext.  domain_in can prevent resource leakages by doing
a ReScanExprContext on this rather than having to free it entirely; so we
can make the ExprContext have the same lifespan (and particularly the same
per_query memory context) as the expression state structs.

Hiroshi Saito

these options were used before -n/-t.

warnings on some compilers.

not merely remove their contents.  Else 'cvs update' complains.

constant input.  Seems worth doing because rule rewriter inserts
IS NOT TRUE tests into WHERE clauses.

supresses compiler warning.

>   http://archives.postgresql.org/pgsql-hackers/2006-08/msg00174.php

Joachim Wieland

the DROP pass rather than the ADD_CONSTR pass.  On examining the code I
think this was just an oversight rather than intentional, and it seems
to satisfy the principle of least surprise better than the alternative
solution that was discussed.  Add an example to the ref page showing how
to do ALTER TYPE and update the default in one command.  Per gripe from
Markus Bertheau that that wasn't possible.

check).  This isn't supported by pg_regress since the recent rewrite
into C.  While we could add char classes to pg_regress.c's code, it's
not really needed at the moment: thanks to Andrew's patch to make
pg_regress always accept the 'standard' comparison file, we can just
drop the version check.

rather than pointers to garbage, when calling AFTER STATEMENT triggers.
Michael Fuhr

'mod' and 'all', which is not the right order.  SGML documentation order
was correct. Report from Chander Ganesan.

in recent -t/-n/-T/-N patch.

Small style cleanups.

temporary context that can be reset when advancing to the next sublist.
This is faster and more thorough at recovering space than the previous
method; moreover it will do the right thing if something in the sublist
tries to register an expression context callback.

as grantees, not PUBLIC ... and you can't say GROUP either.  Noted by
Brian Hurt.

transformInsertStmt: the target table is already in p_rtable at that point.

test to avoid expensive contain_vars_of_level() scan in the normal case
where we're not inside a rule.

Implemented EXEC SQL UNDEF.
Applied first version of the regression test patch by Joachim Wieland <joe@mcknight.de>.

< 	o Add COPY TO STDIN / STDOUT handling
> 	o Add COPY TO STDIN handling

> 	o In rules, allow VALUES() to contain a mixture of 'old' and 'new'
> 	  references