confusion with streaming-replication settings.  Also, change its default
value to "off", because of concern about executing new and poorly-tested
code during ordinary non-replicating operation.  Per discussion.

In passing do some minor editing of related documentation.

text.

when building PDF output for recent versions of the documentation.
There is probably a better answer out there somewhere, but
we need something now so we can build beta releases.

contrib/intarray is loaded.  Per bug #5417 from Kenaniah Cerny.

Not forcing initdb since backend doesn't directly depend on this,
and few people have run into it.

wording, deal explicitly with some fields that were being silently left zero.

Per buildfarm results from dawn_bat.

rather than returning NULL for some-but-not-all failures as they used to.
Remove now-redundant tests for NULL from call sites.

We had to do something about this because many call sites were failing to
check for NULL; and changing it like this seems a lot more useful and
mistake-proof than adding checks to the call sites without them.

pg_stats.inherited

archival or hot standby should be WAL-logged, instead of deducing that from
other options like archive_mode. This replaces recovery_connections GUC in
the primary, where it now has no effect, but it's still used in the standby
to enable/disable hot standby.

Remove the WAL-logging of "unlogged operations", like creating an index
without WAL-logging and fsyncing it at the end. Instead, we keep a copy of
the wal_mode setting and the settings that affect how much shared memory a
hot standby server needs to track master transactions (max_connections,
max_prepared_xacts, max_locks_per_xact) in pg_control. Whenever the settings
change, at server restart, write a WAL record noting the new settings and
update pg_control. This allows us to notice the change in those settings in
the standby at the right moment, they used to be included in checkpoint
records, but that meant that a changed value was not reflected in the
standby until the first checkpoint after the change.

Bump PG_CONTROL_VERSION and XLOG_PAGE_MAGIC. Whack XLOG_PAGE_MAGIC back to
the sequence it used to follow, before hot standby and subsequent patches
changed it to 0x9003.

Fujii Masao

by Fujii Masao.

to RFC 3986.  In particular, these characters now terminate the path part
of a URL: '"', '<', '>', '\', '^', '`', '{', '|', '}'.  The previous behavior
was inconsistent and depended on whether a "?" was present in the path.
Per gripe from Donald Fraser and spec research by Kevin Grittner.

This is a pre-existing bug, but not back-patching since the risks of
breaking existing applications seem to outweigh the benefits.

Per report from Josh.

with kor locale on Windows can use the path.

Reported by Hiroshi Inoue.

and be more tense about the locking requirements for it, to improve performance
in Hot Standby mode.  In passing fix a few bugs and improve a number of
comments in the existing HS code.

Simon Riggs, with some editorialization by Tom

Erik Rijkers

in WAL recovery when it sees the shutdown checkpoint record. It's more
user-friendly to find out about it at that point than at the end of
recovery, and you're not left wondering why your hot standby server never
opens up for read-only connections.

problems with non-deterministic functions.

suggested by Tom Lane.

Catalog version bumped due to system view change.

actually access it, per information from Hiroshi.

Normal superuser processes are allowed to connect even when the database
system is shutting down, or when fewer than superuser_reserved_connection
slots remain.  This is intended to make sure an administrator can log in
and troubleshoot, so don't extend these same courtesies to users connecting
for replication.

Two of these were pointed out by Erik Rijkers; the rest I found.

Closely follow design of other optimizer hooks: if hook exists
retrieve value from plugin; if still not set then get from cache.

of parameters. Fix bug report by Robert Haas that error message and
hint was incorrect if wrong mode parameters specified on master.
Internal changes only. Proposals for parameter simplification on
master/primary still under way.

Clarify comments, downgrade a message to DEBUG and remove some
debug counters. Direct from ideas by Heikki Linnakangas.

come from the realistion that HEAP2_CLEAN records don't
always remove user visible data, so conflict processing for
them can be skipped. Confirm validity using Assert checks,
clarify circumstances under which we log heap_cleanup_info
records. Tuning arises from bug fixing of earlier safety
check failures.

from lc_ctype, that could happen on Windows. We need to change lc_ctype
together with lc_monetary or lc_numeric, and convert strings in lconv
from lc_ctype encoding to the database encoding.

The bug reported by Mikko, original patch by Hiroshi Inoue,
with changes by Bruce and me.

than during define_custom_variable().  This entails rejecting an ALTER
command if the target variable doesn't have a known (non-placeholder)
definition, unless the calling user is superuser.  When the variable *is*
known, we can correctly apply the rule that only superusers can issue ALTER
for SUSET parameters.  This allows define_custom_variable to apply ALTER's
values for SUSET parameters at module load time, secure in the knowledge
that only a superuser could have set the ALTER value.  This change fixes a
longstanding gotcha in the usage of SUSET-level custom parameters; which
is a good thing to fix now that plpgsql defines such a parameter.

There is no other purpose for this message type than to report
the latestRemovedXid of removed tuples, prior to index scans.
Removes overlooked path for sending invalid latestRemovedXid.
Fixes buildfarm failure on centaur.

to handling of btree delete records mean that all snapshot
conflicts on standby now have a valid, useful latestRemovedXid.
Our earlier approach using LW_EXCLUSIVE was useful when we didnt
always have a valid value, though is no longer useful or necessary.
Asserts added to code path to prove and ensure this is the case.
This will reduce contention and improve performance of larger Hot
Standby servers.