access information about the prepared statements that are available
in the current session. Original patch from Joachim Wieland, various
improvements by Neil Conway.

The "statement" column of the view contains the literal query string
sent by the client, without any rewriting or pretty printing. This
means that prepared statements created via SQL will be prefixed with
"PREPARE ... AS ", whereas those prepared via the FE/BE protocol will
not. That is unfortunate, but discussion on -patches did not yield an
efficient way to improve this, and there is some merit in returning
exactly what the client sent to the backend.

Catalog version bumped, regression tests updated.

use it.  While it normally has been opened earlier during btree index
build, testing shows that it's possible for the link to be closed again
if an sinval reset occurs while the index is being built.

dead and have become unreferenced.  Before 8.1, such members were left
for AtEOXact_CatCache() to clean up, but now AtEOXact_CatCache isn't
supposed to have anything to do.  In an assert-enabled build this bug
leads to an assertion failure at transaction end, but in a non-assert
build the dead member is effectively just a small memory leak.
Per report from Jeremy Drake.

an INSERT target list during rule rewriting.  Per report from John Supplee.

rather than elog(FATAL), when there is no more room in ShmemBackendArray.
This is a security issue since too many connection requests arriving close
together could cause the postmaster to shut down, resulting in denial of
service.  Reported by Yoshiyuki Asaba, fixed by Magnus Hagander.

The consequences of overwriting a non-empty page are bad enough that
we should not omit this test in production builds.

the relation but it finds a pre-existing valid buffer.  The buffer does not
correspond to any page known to the kernel, so we *must* do smgrextend to
ensure that the space becomes allocated.  The 7.x branches all do this
correctly, but the corner case got lost somewhere during 8.0 bufmgr rewrites.
(My fault no doubt :-( ... I think I assumed that such a buffer must be
not-BM_VALID, which is not so.)

>
> 	* Allow SERIAL sequences to inherit permissions from the base table?

<   stable logging probably can not have indexes.  [wallog]
>   stable logging probably can not have indexes.  [walcontrol]

<   STABLE | DEFAULT ].  [wallog]
>   STABLE | DEFAULT ].  Tables using non-default logging should not use
>   referential integrity with default-logging tables, and tables using
>   stable logging probably can not have indexes.  [wallog]

<   the table. Another option is to avoid transaction logging entirely
<   and truncate or drop the table on crash recovery.  These should be
<   implemented using ALTER TABLE, e.g. ALTER TABLE PERSISTENCE [ DROP |
<   TRUNCATE | STABLE | DEFAULT ].  [wallog]
>   the table.  This would affect COPY, and perhaps INSERT/UPDATE too.
>   Another option is to avoid transaction logging entirely and truncate
>   or drop the table on crash recovery.  These should be implemented
>   using ALTER TABLE, e.g. ALTER TABLE PERSISTENCE [ DROP | TRUNCATE |
>   STABLE | DEFAULT ].  [wallog]

>
> * Allow control over which tables are WAL-logged
>
>   Allow tables to bypass WAL writes and just fsync() dirty pages on
>   commit.  To do this, only a single writer can modify the table, and
>   writes must happen only on new pages.  Readers can continue accessing
>   the table. Another option is to avoid transaction logging entirely
>   and truncate or drop the table on crash recovery.  These should be
>   implemented using ALTER TABLE, e.g. ALTER TABLE PERSISTENCE [ DROP |
>   TRUNCATE | STABLE | DEFAULT ].  [wallog]

< * %Remove behavior of postmaster -o after making postmaster/postgres
<   flags unique
> * %Remove behavior of postmaster -o

http://archives.postgresql.org/pgsql-hackers/2006-01/msg00151.php for the
complete plan.

> * -Remove BeOS and QNX-specific code

an LWLock instead of a spinlock.  This hardly matters on Unix machines
but should improve startup performance on Windows (or any port using
EXEC_BACKEND).  Per previous discussion.

expressional indexes.  Per report from Brian Hirt.

This makes the salt space for md5 and xdes algorithms a lot smaller than
it should be.

Marko Kreen

than the local query specifies (e.g. in the FROM clause),
throw an ERROR (instead of crashing). Fix for bug #2129 reported
by Akio Iwaasa.

per http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=343616 via Martin Pitt.

returning the rowtype it's supposed to return.  Per reports from David Niblett
and Michael Fuhr.

optimization.

call for every stats packet read to adjust select() timeout.  Other
stylistic improvements.