Update hstore docs, mostly word-smithing.

David E. Wheeler

There is no reference to THREAD_SUPPORT outside configure, and it is
never set, so remove it.

Per report from Robert Gravsjö.

branch, which is how most actual code is actually structured.  Also fix
slight whitespace misalignment.

we have to tell Perl it can release its compiled copy of the function
text.  Noted by Alexey Klyukin.

Back-patch to 8.2 --- the problem exists further back, but this patch
won't work without modification, and it's probably not worth the trouble.

arrays in a pg_proc entry match.  Seems like an easy mistake to make when
manually adjusting these values in a pg_proc.h entry.

being hidden when current_query is.  Relocate it to a column position
more consistent with that behavior.  Per discussion.

Joshua Tolley, reviewed by Brendan Jurd and Tim Bunce

pg_stat_activity and recorded in log entries.

Dave Page, reviewed by Andres Freund

Add link to exteran fsync testing script and our fsync test tool.

Improve test descriptions displayed during test_fsync;  increase default
loops to 5k.

by adding a requirement that build_join_rel add new join RelOptInfos to the
appropriate list immediately at creation.  Per report from Robert Haas,
the list_concat_unique_ptr() calls that this change eliminates were taking
the lion's share of the runtime in larger join problems.  This doesn't do
anything to fix the fundamental combinatorial explosion in large join
problems, but it should push out the threshold of pain a bit further.

Note: because this changes the order in which joinrel lists are built,
it might result in changes in selected plans in cases where different
alternatives have exactly the same costs.  There is one example in the
regression tests.

vacuum.

comment.

string too.

in the build process. If not the build process will stop with an error message.

Boszormenyi Zoltan, with only a minor tweak or two from me.

the time, rather than hoping we can tell whether the terminal supports
UTF8 characters.  Per discussion.

Author: Erik Rijkers <er@xs4all.nl>

Author: Euler Taveira de Oliveira <euler@timbira.com>

newline representations.  Per buildfarm results and subsequent discussion.
Sync up a couple of other places that had their own policies.

Hiroshi Saito

be part of multixacts, so allocate a slot for each prepared transaction in
the "oldest member" array in multixact.c. On PREPARE TRANSACTION, transfer
the oldest member value from the current backends slot to the prepared xact
slot. Also save and recover the value from the 2pc state file.

The symptom of the bug was that after a transaction prepared, a shared lock
still held by the prepared transaction was sometimes ignored by other
transactions.

Fix back to 8.1, where both 2PC and multixact were introduced.

a bit more consistent and less obviously written by different people at
different times.

We have used -w for a long time as a means of reducing the reported diff
volume when one element of a result table isn't of the expected width.
However, most of the time the results just pass anyway, so this isn't as
important as it once was.  Meanwhile, the risk of missing potentially
significant deviations has gone up, particularly with psql's ability to
report error cursor positions.  So, let's switch over to space-sensitive
comparisons.  Per my proposal of yesterday.

(All the expected files that I can test here seem to be ready for this
already, but we'll see what the buildfarm thinks about others.)

Jan Urbanski

in the formerly-always-blank columns just to left and right of the data.
Different marking is used for a line break caused by a newline in the data
than for a straight wraparound.  A newline break is signaled by a "+" in the
right margin column in ASCII mode, or a carriage return arrow in UNICODE mode.
Wraparound is signaled by a dot in the right margin as well as the following
left margin in ASCII mode, or an ellipsis symbol in the same places in UNICODE
mode.  "\pset linestyle old-ascii" is added to make the previous behavior
available if anyone really wants it.

In passing, this commit also cleans up a few regression test files that
had unintended spacing differences from the current actual output.

Roger Leigh, reviewed by Gabrielle Roth and other members of PDXPUG.

the client encoding is UTF-8.

a limited version of a patch proposed by Itagaki Takahiro

list, minus a few specific words that have to be treated specially.  This
replaces a hard-wired list of keywords that would have needed manual
maintenance, and was not getting it.  The 8.4 coding was already missing
these words, causing ecpg to incorrectly treat them as reserved words:
CALLED, CATALOG, DEFINER, ENUM, FOLLOWING, INVOKER, OPTIONS, PARTITION,
PRECEDING, RANGE, SECURITY, SERVER, UNBOUNDED, WRAPPER.  In HEAD we were
additionally missing COMMENTS, FUNCTIONS, SEQUENCES, TABLES.
Per gripe from Bosco Rama.

checked to determine whether the trigger should be fired.

For BEFORE triggers this is mostly a matter of spec compliance; but for AFTER
triggers it can provide a noticeable performance improvement, since queuing of
a deferred trigger event and re-fetching of the row(s) at end of statement can
be short-circuited if the trigger does not need to be fired.

Takahiro Itagaki, reviewed by KaiGai Kohei.