function xmlagg.

< first.
> first.  There is also a developer's wiki at
> http://developer.postgresql.org.

for its header comment.

> 	o Allow multiple vacuums so large tables do not starve small
> 	  tables
>
> 	  http://archives.postgresql.org/pgsql-general/2007-01/msg00031.php
>
> 	o Improve control of auto-vacuum
>
> 	  http://archives.postgresql.org/pgsql-hackers/2006-12/msg00876.php

"input" and "output" dirs be necessarily present.

* Add Globally/Universally Unique Identifier (GUID/UUID)
>   http://archives.postgresql.org/pgsql-general/2007-01/msg00853.php

with new GUC parameter "xmlbinary" that controls the output encoding, as
per SQL/XML standard.

the generated files, to help Visual C++ to run these tests.  The tests still
pass in VPATH and normal builds.

Patch from Magnus Hagander, editorialized by me.

declarations are ignored and removed, in binary mode they are honored as
specified by the XML standard.

for aggregates.  This is OK for current uses but could burn somebody
someday...

pending fsyncs during DROP DATABASE.  Obviously necessary in hindsight :-(

dependency on the platform's floating point implementation. Per
report from Stefan Kaltenbrunner.

is deleted.  A backend about to unlink a file now sends a "revoke fsync"
request to the bgwriter to make it clean out pending fsync requests.  There
is still a race condition where the bgwriter may try to fsync after the unlink
has happened, but we can resolve that by rechecking the fsync request queue
to see if a revoke request arrived meanwhile.  This eliminates the former
kluge of "just assuming" that an ENOENT failure is okay, and lets us handle
the fact that on Windows it might be EACCES too without introducing any
questionable assumptions.  After an idea of mine improved by Magnus.

The HEAD patch doesn't apply cleanly to 8.2, but I'll see about a back-port
later.  In the meantime this could do with some testing on Windows; I've been
able to force it through the code path via ENOENT, but that doesn't prove that
it actually fixes the Windows problem ...

* After Markos patch, now builds pgcrypto without zlib again
* Updates README with xml info
* xml requires xslt and iconv
* disable unnecessary warning about __cdecl()
* Add a buildenv.bat called from all other bat files to set up things
like PATH for flex/bison. (Can't just set it before calling, doesn't
always work when building from the GUI)

The implementation is somewhat ugly logic-wise, but I don't see an
easy way to make it more concise.

When writing this, I noticed that my previous implementation of
width_bucket() doesn't handle NaN correctly:

    postgres=# select width_bucket('NaN', 1, 5, 5);
     width_bucket
    --------------
                6
    (1 row)

AFAICS SQL:2003 does not define a NaN value, so it doesn't address how
width_bucket() should behave here. The patch changes width_bucket() so
that ereport(ERROR) is raised if NaN is specified for the operand or the
lower or upper bounds to width_bucket(). For float8, NaN is disallowed
for any of the floating-point inputs, and +/- infinity is disallowed
for the histogram bounds (but allowed for the operand).

Update docs and regression tests, bump the catversion.

existing TODO items, and re-add a TODO item for an "estimated
count" capability.

it was checking a pg_constraint OID instead of pg_class OID, resulting in
"relation with OID nnnnn does not exist" failures for anyone who wasn't
owner of the table being examined.  Per bug #2848 from Laurence Rowe.

Note: for existing 8.2 installations a simple version update won't fix this;
the easiest fix is to CREATE OR REPLACE this view with the corrected
definition.

accessing it, like DROP DATABASE.  This allows the regression tests to pass
with autovacuum enabled, which open the gates for finally enabling autovacuum
by default.

roles and tablespaces, no longer users and groups. Per Dave Page.

Backport to 8.2 and 8.1.

Slightly reworked patch from Tatsuo Ishii

Per recent -hackers thread, this is noteworthy because Postgres behaves
differently from most implementations of NaN, including IEEE754.

Patch from Marko Kreen.

< 		o Fix memory leak from exceptions
<
< 		  http://archives.postgresql.org/pgsql-performance/2006-06/msg00305.php
<
< * Allow constraint_exclusion to work for UNIONs like it does for
<   inheritance, allow it to work for UPDATE and DELETE statements, and allow
<   it to be used for all statements with little performance impact
<
< * Add estimated_count(*) to return an estimate of COUNT(*)
<
<   This would use the planner ANALYZE statistics to return an estimated
<   count.
<   http://archives.postgresql.org/pgsql-hackers/2005-11/msg00943.php

standard convention the 21st century runs from 2001-2100, not 2000-2099,
so make it work like that.  Per bug #2885 from Akio Iwaasa.

Backpatch to 8.2, but no further, since this is really a definitional
change; users of older branches are probably more interested in stability.

hold true for operators in a btree operator family.  This is mostly to
clarify my own thinking about what the planner can assume for optimization
purposes.  (blowing dust off an old abstract-algebra textbook...)

coercion to type xml was a mistake.  Escape values so they are valid
XML character data.

create expected file with correct port number

Added patch by Joachim to work around OpenBSD bug in regression suite.

(or other types of pg_class entry): the function pgstat_vacuum_tabstat,
invoked during VACUUM startup, had runtime proportional to the number of
stats table entries times the number of pg_class rows; in other words
O(N^2) if the stats collector's information is reasonably complete.
Replace list searching with a hash table to bring it back to O(N)
behavior.  Per report from kim at myemma.com.

Back-patch as far as 8.1; 8.0 and before use different coding here.