in PITR scenarios.  We now WAL-log the replacement of old XIDs with
FrozenTransactionId, so that such replacement is guaranteed to propagate to
PITR slave databases.  Also, rather than relying on hint-bit updates to be
preserved, pg_clog is not truncated until all instances of an XID are known to
have been replaced by FrozenTransactionId.  Add new GUC variables and
pg_autovacuum columns to allow management of the freezing policy, so that
users can trade off the size of pg_clog against the amount of freezing work
done.  Revise the already-existing code that forces autovacuum of tables
approaching the wraparound point to make it more bulletproof; also, revise the
autovacuum logic so that anti-wraparound vacuuming is done per-table rather
than per-database.  initdb forced because of changes in pg_class, pg_database,
and pg_autovacuum catalogs.  Heikki Linnakangas, Simon Riggs, and Tom Lane.

suggestion from Sergey Koposov.  Also some other minor editing.

command strings inserts relative not absolute path of file to process.
This is a side-effect of 2005-07-04 change that makes the server use
relative paths in general.  Noted by Bernd Helmle.

return, per suggestion from Joachim Wieland.

deletion code to avoid the case where an upper-level btree page remains "half
dead" for a significant period of time, and to block insertions into a key
range that is in process of being re-assigned to the right sibling of the
deleted page's parent.  This prevents the scenario reported by Ed L. wherein
index keys could become out-of-order in the grandparent index level.

Since this is a moderately invasive fix, I'm applying it only to HEAD.
The bug exists back to 7.4, but the back branches will get a different patch.

(blobs) with comments, per bug #2727 from Konstantin Pelepelin.
Mea culpa for not having tested this case.
Back-patch to 8.1; prior branches don't dump blob comments at all.

reference pages documenting that these commands cannot be used within
a transaction block. Also make some minor improvements to the psql
reference page. Patch from Simon Riggs, minor editorialization by
myself.

code relies on the checking macro actually being called at the end, or the
automatic undiversion will produce garbage.  These sort of implicit
side-effects undermine the modularity of the macros and happen to break the
ODBC driver which makes use of them.

Also put the warnings at the very end of configure, so there is an even
better chance of seeing them.

load balancing, and clustering options.

clustering options.

node of a SubLink or SubPlan testexpr field.  Bug resulted from replacing
the old lefthand/exprs list fields with a simple expression field, and not
remembering that expression_tree_walker is coded to save a few cycles by
recursing directly to self on list fields (on the assumption the walker
isn't interested in List nodes per se).  On non-list fields it must of
course call the walker.  Possibly that hack isn't worth the risk of more
such bugs, but I'll leave it be for now.  Per bug report from James Robinson.

outer joins.  Originally it was only looking for overlap of the righthand
side of a left join, but we have to do it on the lefthand side too.
Per example from Jean-Pierre Pelletier.

CopyFileEx.  This avoids a warning about the function not being
present on older Windows versions.  Magnus Hagander

* Add estimated_count(*) to return an estimate of COUNT(*)
>   http://archives.postgresql.org/pgsql-hackers/2005-11/msg00943.php

* Speed up COUNT(*)
>   http://archives.postgresql.org/pgsql-hackers/2005-11/msg00943.php

instead of the SQL92 output-column-ID case.

than just showing the incomprehensible formulas.

that are almost never used.  Put documentation-related variables into the
documentation chapter.

This was required back when RESUME_INTERRUPTS could actually
execute ProcessInterrupts, but that hasn't been true since 2001...

newlines.

because the function didn't exist in 7.4.X.

Marko Kreen

>   http://archives.postgresql.org/pgsql-hackers/2006-10/msg00820.php

the politically correct view that backslash escapes are deprecated.