a portal are never NULL, but reliably provide the source text of the query.
It turns out that there was only one place that was really taking a short-cut,
which was the 'EXECUTE' utility statement.  That doesn't seem like a
sufficiently critical performance hotspot to justify not offering a guarantee
of validity of the portal source text.  Fix it to copy the source text over
from the cached plan.  Add Asserts in the places that set up cached plans and
portals to reject null source strings, and simplify a bunch of places that
formerly needed to guard against nulls.

There may be a few places that cons up statements for execution without
having any source text at all; I found one such in ConvertTriggerToFK().
It seems sufficient to inject a phony source string in such a case,
for instance
        ProcessUtility((Node *) atstmt,
                       "(generated ALTER TABLE ADD FOREIGN KEY command)",
                       NULL, false, None_Receiver, NULL);

We should take a second look at the usage of debug_query_string,
particularly the recently added current_query() SQL function.

ITAGAKI Takahiro and Tom Lane

ITAGAKI Takahiro

ITAGAKI Takahiro

rewrite.  When called from SIInsertDataEntries, SICleanupQueue releases
the write lock if it has to issue a kill() to signal some laggard backend.
That still seems like a good idea --- but it's possible that by the time
we get the lock back, there are no longer enough free message slots to
satisfy SIInsertDataEntries' requirement.  Must recheck, and repeat the
whole SICleanupQueue process if not.  Noted while reading code.

robust.  The previous coding was quite risky because it was testing
conditions different from 'is the array really allocated?'.

(Unlike the original submission, this patch treats TABLE output parameters
as being entirely equivalent to OUT parameters -- tgl)

Pavel Stehule

* Implement SQL:2003 window functions

>   http://archives.postgresql.org/pgsql-hackers/2008-07/msg00232.php

it.

Per report from Tom Lane based on buildfarm evidence.

problem with DISTINCT, so might as well commit it.

>
> * Reduce locking requirements for creating a trigger
>
>   http://archives.postgresql.org/pgsql-hackers/2008-06/msg00635.php
>

* Implement SQL:2003 window functions
>
>   http://archives.postgresql.org/pgsql-hackers/2008-06/msg00380.php
>

need to deconstruct proargmodes for each pg_proc entry inspected by
FuncnameGetCandidates().  Fixes function lookup performance regression
caused by yesterday's variadic-functions patch.

In passing, make pg_proc.probin be NULL, rather than a dummy value '-',
in cases where it is not actually used for the particular type of function.
This should buy back some of the space cost of the extra column.

>
> 	o Add external tool to auto-tune some postgresql.conf parameters
>
> 	  http://archives.postgresql.org/pgsql-hackers/2008-06/msg00000.php
>

so long as all the trailing arguments are of the same (non-array) type.
The function receives them as a single array argument (which is why they
have to all be the same type).

It might be useful to extend this facility to aggregates, but this patch
doesn't do that.

This patch imposes a noticeable slowdown on function lookup --- a follow-on
patch will fix that by adding a redundant column to pg_proc.

Pavel Stehule

Pavel Stehule

Euler Taveira de Oliveira.

>
> 	o Reduce PITR WAL file size by removing full page writes and
> 	  by removing trailing bytes to improve compression

>
> * Consider decreasing the I/O caused by updating tuple hint bits
>
>   http://archives.postgresql.org/pgsql-hackers/2008-05/msg00847.php
>

> 	o -Have psql show current values for a sequence

Dickson S. Guedes

Report from Martin Saschek

psql.

> * Improve ability to modify views via ALTER TABLE
>
>   http://archives.postgresql.org/pgsql-hackers/2008-05/msg00691.php

Gregory Stark

< * Add temporal versions of generate_series()
> * -Add temporal versions of generate_series()

* Consider allowing control of upper/lower case folding of unquoted
  identifiers

>   http://archives.postgresql.org/pgsql-hackers/2008-07/msg00415.php

< 	o Fix server restart problem when the server was shutdown during
> 	o -Fix server restart problem when the server was shutdown during

macros patch :-(.  Results from both baiji and mastodon imply that MSVC
fails to perceive offsetof(PageHeaderData, pd_linp[0]) as a constant
expression in some contexts where offsetof(PageHeaderData, pd_linp) works
fine.  Sloth, thy name is Micro.

on the most common individual lexemes in place of the mostly-useless default
behavior of counting duplicate tsvectors.  Future work: create selectivity
estimation functions that actually do something with these stats.

(Some other things we ought to look at doing: using the Lossy Counting
algorithm in compute_minimal_stats, and using the element-counting idea for
stats on regular arrays.)

Jan Urbanski

thereby forestalling any problems with alignment of the data structure placed
there.  Since SizeOfPageHeaderData is maxalign'd anyway in 8.3 and HEAD, this
does not actually change anything right now, but it is foreseeable that the
header size will change again someday.  I had to fix a couple of places that
were assuming that the content offset is just SizeOfPageHeaderData rather than
MAXALIGN(SizeOfPageHeaderData).  Per discussion of Zdenek's page-macros patch.

SizeOfPageHeaderData instead of sizeof(PageHeaderData) in places where that
makes the code clearer, and avoid casting between Page and PageHeader where
possible.  Zdenek Kotala, with some additional cleanup by Heikki Linnakangas.

I did not apply the parts of the proposed patch that would have resulted in
slightly changing the on-disk format of hash indexes; it seems to me that's
not a win as long as there's any chance of having in-place upgrade for 8.4.