thinking that indexes of different sizes are equally attractive.  Per
gripe from Jim Nasby.  (I remain unconvinced that there's such a problem
in existing releases, but CVS HEAD definitely has got a problem because
of its new count-only-leaf-pages approach to indexscan costing.)

hash tables, instead of the previous kluge involving multiple hash tables.
This partially undoes my patch of last December.

BufferAlloc tries to insert a new mapping entry before deleting the old one
for a buffer, we have a transient need for more than NBuffers entries ---
one more in 8.1, and as many as NUM_BUFFER_PARTITIONS more in CVS HEAD.
In theory this could lead to an "out of shared memory" failure if shmem
had already been completely claimed by the time the extra entries were
needed.

partitions, as per discussion.  Passes functionality checks, but
I don't have any performance data yet.

to the low-order bits of the entry hash value.  Also make some incidental
cleanups in the dynahash API, such as not exporting the hash header
structs to the world.

noticed.  Fix SpinlockSemas() to report the correct count considering
that PG 8.1 adds a spinlock to each shared-buffer header.

effects in a nestloop inner indexscan, I had only dealt with plain index
scans and the index portion of bitmap scans.  But there will be cache
benefits for the heap accesses of bitmap scans too, so fix
cost_bitmap_heap_scan() to account for that.

-built-in mechanism through the -MP flag.  Adjust the file extensions to
look more like Automake practice.  This frees up the .d suffix for use by
DTrace.

opclass.  This is not so much because anyone's likely to create an index
on TID, as that sorting TIDs can be useful.  Also added max and min
aggregates while at it, so that one can investigate the clusteredness of
a table with queries like SELECT min(ctid), max(ctid) FROM tab WHERE ...
Greg Stark and Tom Lane

pg_regress: there's no other way to cope with testing a relocated
installation.  Seems better to call it --psqldir though, since the
only thing we need to find in that case is psql.  It'd be better if
we could use find_other_exec, but that's not happening unless we are
willing to install pg_regress alongside psql, which seems unlikely
to happen.

the check on diff's exit status to check for literally 0 or 1.  Someone
should look into why WIFEXITED/WEXITSTATUS don't work for this, but I've
spent more than enough time on it already.

May help in debugging behavior on Windows.

not when they're started.  This mimics a subtle point of the behavior
of the old shell script, and gives better feedback when watching the
tests.

switches passed from the Makefile.  This looks like it will fix
problem with virtual vs real paths under msys.

recovery.  In the first place, it doesn't work because slru's
latest_page_number isn't set up yet (this is why we've been hearing reports
of strange "apparent wraparound" log messages during crash recovery, but
only from people who'd managed to advance their next-mxact counters some
considerable distance from 0).  In the second place, it seems a bit unwise
to be throwing away data during crash recovery anwyway.  This latter
consideration convinces me to just disable truncation during recovery,
rather than computing latest_page_number and pushing ahead.

  - Few README fixes
  - Keep imath Id string, put $PostgreSQL$ separately.

Patch from Marko Kreen.

just exec instead of creating a subprocess.  This reduces process usage
from four processes per parallel test to two.  I have no idea whether
a comparable optimization is possible or useful in the Windows port.

'make install' or 'initdb' fails.  Also minor simplification of fgets()
usage --- fgets guarantees a trailing null anyway.

enthusiastic copy and paste ...

This allows it to be used on Windows without installing mingw
(though you do still need 'diff'), and opens the door to future
improvements such as message localization.
Magnus Hagander and Tom Lane.

with symlinks.  Noted while trying to use rmtree in new C-code pg_regress.

"DESCRIPTION", which is actually only allowed for device drivers. The
compilers ignore it with a warning - if we remove them, we get rid of
the warning.

Magnus Hagander

        o -Display IN, INOUT, and OUT parameters in \df

code to forcibly drop regressuser[1-4] and regressgroup[1-2].  Instead,
let the privileges.sql test do that for itself (this is made easy by
the recent addition of DROP ROLE IF EXISTS).  Per a recent patch proposed
by Joachim Wieland --- the rest of his patch is superseded by the
rewrite into C, but this is a good idea we should adopt.

(OUT or INOUT) of the function. Patch from David Fetter, editorialization
by Neil Conway.

don't include a space between the function name and the parenthesis
that begins its parameter list, for consistency.

HAVE_STRUCT_SOCKADDR_STORAGE_SS_LEN.  Per results of pgcheckdefines.