transaction rollback via UNDO but I think that's highly unlikely to
happen, so we may as well remove the stubs.  (Someday we ought to
rip out the stub xxx_undo routines, too.)  Per Alvaro.

really ought to run before canonicalize_qual, because it can now produce
forms that canonicalize_qual knows how to improve (eg, NOT clauses).
Also, because eval_const_expressions already knows about flattening
nested ANDs and ORs into N-argument form, the initial flatten_andors
pass in canonicalize_qual is now completely redundant and can be
removed.  This doesn't save a whole lot of code, but the time and
palloc traffic eliminated is a useful gain on large expression trees.

access: define new index access method functions 'amgetmulti' that can
fetch multiple TIDs per call.  (The functions exist but are totally
untested as yet.)  Since I was modifying pg_am anyway, remove the
no-longer-needed 'rel' parameter from amcostestimate functions, and
also remove the vestigial amowner column that was creating useless
work for Alvaro's shared-object-dependencies project.
Initdb forced due to changes in pg_am.

that is 'x = true' becomes 'x' and 'x = false' becomes 'NOT x'.  This isn't
all that amazingly useful in itself, but it ensures that we will recognize
the different forms as being logically equivalent when checking partial
index predicates.  Per example from Patrick Clery.

clean up itup.h a little bit.

structs.  There are many places in the planner where we were passing
both a rel and an index to subroutines, and now need only pass the
index struct.  Notationally simpler, and perhaps a tad faster.

for boolean indexes.  Previously we would only use such an index with
WHERE clauses like 'indexkey = true' or 'indexkey = false'.  The new
code transforms the cases 'indexkey', 'NOT indexkey', 'indexkey IS TRUE',
and 'indexkey IS FALSE' into one of these.  While this is only marginally
useful in itself, I intend soon to change constant-expression simplification
so that 'foo = true' and 'foo = false' are reduced to just 'foo' and
'NOT foo' ... which would lose the ability to use boolean indexes for
such queries at all, if the indexscan machinery couldn't make the
reverse transformation.

binary-compatible relabeling of one or both operands.  examine_variable
should avoid stripping RelabelType from non-variable expressions, so that
they will continue to have the correct type; and convert_to_scalar should
just use that type and ignore the other input type.  This isn't perfect
but it beats failing entirely.  Per example from Michael Fuhr.

checkInsertTargets().  Avoids O(N^2) behavior on wide target lists.

output ordering.

when a zero-month interval is given.  Per discussion with Karel.
Also, some desultory const-labeling of constant tables.  More could be
done along that line.

This reduces header file install from 8 seconds to 0.40 seconds.

> 	o Do VACUUM FULL if table is nearly empty?

actual number of unremoved tuples as pg_class.reltuples.  The idea of
trying to estimate a steady state condition still seems attractive, but
this particular implementation crashed and burned ...

executing a statement that fires triggers.  Formerly this time was
included in "Total runtime" but not otherwise accounted for.
As a side benefit, we avoid re-opening relations when firing non-deferred
AFTER triggers, because the trigger code can re-use the main executor's
ResultRelInfo data structure.

when open references remain during normal cleanup of a resource owner.
This restores the system's ability to warn about leaks to what it was
before 8.0.  Not really a user-level bug, but helpful for development.

immunte to changes in libpq's usage of pgport between major versions.

overly strong lock on pg_depend, and it wasn't closing the rel when done.
The latter bug was masked by the ResourceOwner code, which is something
that should be changed.

DefineCustomRealVariable().  Thomas Hallgren

Karel Zak

Correct one mis-setting of freeval (which could at worst leak a few bytes
until the trigger exits, so it's no big deal).

	http://www.chiark.greenend.org.uk/~sgtatham/bugs.html

should work on Windows now.  Also, rename set_noblock to pg_set_noblock;
since it is included in libpq, the former name polluted application
namespace.

its private storage, because that belongs to the function that it is
supposed to call.  Per report from Ezequiel Tolnay.

linking to libpq.  This insulates applications from changes in libpq's
usage of libpgport functions.

Backpatched to 8.0.X.

never-yet-vacuumed relation.  This restores the pre-8.0 behavior of
avoiding seqscans during initial data loading, while still allowing
reasonable optimization after a table has been vacuumed.  Several
regression test cases revert to 7.4-like behavior, which is probably
a good sign.  Per gripes from Keith Browne and others.

         * Touch the socket and lock file at least every hour, to
         * ensure that they are not removed by overzealous /tmp-cleaning
         * tasks.  Set to 58 minutes so a cleaner never sees the
         * file as an hour old.

creation fails ... no point in running the tests.

per recent discussion concluding that this is the Right Thing.  Add
regression test check for this behavior.  Michael Fuhr

prevent complaints from laptop users who don't like their hard drives
starting up every 10 minutes.

<
> * Add GUC to issue notice about queries that use unjoined tables

currently does.  This is now the default Win32 wal sync method because
we perfer o_datasync to fsync.

Also, change Win32 fsync to a new wal sync method called
fsync_writethrough because that is the behavior of _commit, which is
what is used for fsync on Win32.

Backpatch to 8.0.X.

< * Add ANSI INTERVAL handling
> * Add ISo INTERVAL handling
< 	o Interpret syntax that isn't uniquely ANSI or PG, like '1:30' or
< 	  '1' as ANSI syntax, e.g. interpret '1:30' MINUTE TO SECOND as
> 	o Interpret syntax that isn't uniquely ISO or PG, like '1:30' or
> 	  '1' as ISO syntax, e.g. interpret '1:30' MINUTE TO SECOND as
649c649
< * Add pre-parsing phase that converts non-ANSI syntax to supported
> * Add pre-parsing phase that converts non-ISO syntax to supported