truncate_identifier won't do anything if the passed-in strlen is already
less than NAMEDATALEN, which it always would be given the strlcpy usage.
This has been broken since the arrays-of-composite-types code went in.

Arguably truncate_identifier is suffering from excessive optimization
and should always process the string, but for the moment I'll take the
more localized patch.

Per bug #4987.

to access a Relation entry it had just closed.  I happened to be testing with
CLOBBER_CACHE_ALWAYS, which made this a guaranteed core dump (at least on
machines where sprintf %s isn't forgiving of a NULL pointer).  It's probably
quite unlikely that it would fail in the field, but a bug is a bug.  Fix by
moving the relation_close call down past the logging action.

that memory allocated by starting third party DLLs doesn't end up
conflicting with it.

Hopefully this solves the long-time issue with "could not reattach
to shared memory" errors on Win32.

Patch from Tsutomu Yamada and me, based on idea from Trevor Talbot.

affects the C compiler step - we still only build one target at a
time.

Re-add documentation for --no-readline option of psql, mistakenly removed a decade ago. Backpatch to release 7.4.

when we reach the post-COPY "pump it dry" error recovery code that was added
2006-11-24.  Per a report from Neil Best, there is at least one code path
in which this occurs, leading to an infinite loop in code that's supposed
to be making it more robust not less so.  A reasonable response seems to be
to call PQputCopyEnd() again, so let's try that.

Back-patch to all versions that contain the cleanup loop.

if a smart shutdown is already in progress. Backpatch to 8.3, this was broken
in the patch that introduced "dead-end backends".

Per report by Itagaki Takahiro, patch by Fujii Masao.

header files.

Josh Williams

we should ignore NULL array entries, not non-NULL ones.  This had the
effect of disabling commit_delay, and could have caused a crash in the
rare race condition the patch was intended to fix.

Bug report and diagnosis by Jeff Janes, in bug #4952.

 Aaron Marcuse-Kubitza <aaronmk@blackducksoftware.com>

The original coding was not dealing specially with this file being a symlink,
with the end result that it was not installed in VPATH builds.  Oddly enough,
the clean target does know about it ...

that the sanity checking I added to create_mergejoin_plan() in 8.3 was a
few bricks shy of a load: the mergeclauses could reference pathkeys in a
noncanonical order such as x,y,x, not only cases like x,x,y which is all
that the code had allowed for.  The odd cases only turn up when using
redundant clauses in an outer join condition, which is why no one had
noticed before.

RevalidateCachedPlan.  This is to avoid a "SPI_ERROR_CONNECT" failure when
the planner calls a SPI-using function and we are already inside one.
The alternative fix is to expect callers of RevalidateCachedPlan to do this,
which seems likely to result in additional hard-to-detect bugs of omission.
Per reports from Frank van Vugt and Marek Lewczuk.

Back-patch to 8.3. It's much harder to trigger the bug in 8.3, due to a
smaller set of cases in which plans can be invalidated, but it could happen.
(I think perhaps only a SI reset event could make 8.3 fail here, but that's
certainly within the realm of possibility.)

last pair of parameter name/value strings, even when there are MAXPARAMS
of them.  Aboriginal bug in contrib/xml2, noted while studying bug #4912
(though I'm not sure whether there's something else involved in that
report).

This might be thought a security issue, since it's a potential backend
crash; but considering that untrustworthy users shouldn't be allowed
to get their hands on xslt_process() anyway, it's probably not worth
getting excited about.

In what seems like an oversight, we used to treat 'TH' the same as lowercase
'th', but only with HH/HH12.

we already do it for PAM.

a number of other geometric operators also depend on.  It miscalculated the
slope of the perpendicular to the given line segment anytime that slope was
other than 0, infinite, or +/-1.  In some cases the error would be masked
because the true closest point on the line segment was one of its endpoints
rather than the intersection point, but in other cases it could give an
arbitrarily bad answer.  Per bug #4872 from Nick Roosevelt.

Bug goes clear back to Berkeley days, so patch all supported branches.
Make a couple of cosmetic adjustments while at it.

This prevents autovacuum from reclaiming free space in them and causing
the test's output row order to change, which is causing intermittent
bogus failure reports in the buildfarm.

Backpatch to 8.3.  The issue exists further back, but since autovacuum was
not on by default before 8.3, it's not a problem for buildfarm testing.

Bangladesh, Egypt, Jordan, Pakistan.

node starts from the same place as the first scan did.  This avoids surprising
behavior of scrollable and WITH HOLD cursors, as seen in Mark Kirkwood's bug
report of yesterday.

It's not entirely clear whether a rescan should be forced to drop out of the
syncscan mode, but for the moment I left the code behaving the same on that
point.  Any change there would only be a performance and not a correctness
issue, anyway.

Back-patch to 8.3, since the unstable behavior was created by the syncscan
patch.

eg Japan.  Report and fix by Itagaki Takahiro.  Also fix CASHDEBUG printout
format for branches with 64-bit money type, and some minor comment cleanup.

Back-patch to 7.4, because it's broken all the way back.

Sergey Burladyan, there are at least some dank corners of libxml2 that
assume this behavior, even though their published documentation suggests
they shouldn't.

This is only really a live problem in 8.3, but the code is still there
for possible debugging use in HEAD, so patch both branches.

the database list too often.

Per bug report from Łukasz Jagiełło and ensuing discussion on
pgsql-performance.

Adjust recent PERL_SYS_INIT3 call to avoid platforms where it might fail, and to remove compilation warning. Backpatch the release 7.4

should use GinItemPointerGetBlockNumber/GinItemPointerGetOffsetNumber,
not ItemPointerGetBlockNumber/ItemPointerGetOffsetNumber, because the latter
will Assert() on ip_posid == 0, ie a "Min" pointer.  (Thus, ItemPointerIsMin
has never worked at all, but it seems unused at present.)  I'm not certain
that the case can occur in normal functioning, but it's blowing up on me
while investigating Tatsuo-san's data corruption problem.  In any case it
seems like a problem waiting to bite someone.

Back-patch just in case this really is a problem for somebody in the field.

Search for versioned perl library instead of using hardcoded name on Windows. Backpatch to release 8.3

symbolic links with the -l option, and as Fujii Masao pointed out we ended up
overwriting files in the archive directory before this patch. Patch by
Aidan Van Dyk, Fujii Masao and me.

Backpatch to 8.3, where pg_standby was introduced.

this case is worth a special code path, but a special code path that gets
the boundary condition wrong is definitely no good.  Per bug #4821 from
Andrew Gierth.

In passing, clean up some minor code formatting issues (excess parentheses
and blank lines in odd places).

Back-patch to 8.3, where the bug was introduced.

there's no analyzable attributes or indexes. We also used to report 0 live
and dead tuples for such tables, which messed with autovacuum threshold
calculations.

This fixes bug #4812 reported by George Su. Backpatch back to 8.1.

xml_parse, all arising from the same sloppy usage of parse_xml_decl.
The original coding had that function returning its output string
parameters in the libxml context, which is long-lived, and all but one
of its callers neglected to free the strings afterwards.  The easiest
and most bulletproof fix is to return the strings in the local palloc
context instead, since that's short-lived.  This was only costing a
dozen or two bytes per function call, but that adds up fast if the
function is called repeatedly ...

Noted while poking at the more general problem of what to do with our
libxml memory allocation hooks.  Back-patch to 8.3, which has the
identical coding.

of AND/OR clause branches that predtest.c would attempt to deal with.  As
noted in bug #4721, that change disabled proof attempts for sizes of problems
that people are actually expecting it to work for.  The original complaint
it was trying to solve was O(N^2) behavior for long IN-lists, so let's try
applying the limit to just ScalarArrayOpExprs rather than everything.
Another case of "foolish consistency" I fear.

Back-patch to 8.2, same as the previous patch was.

you can end up with an unrecoverable backup if you start a new base backup
right after finishing archive recovery. In that scenario, the redo pointer of
the checkpoint that pg_start_backup() writes points to the XLOG segment where
the timeline-changing end-of-archive-recovery checkpoint is. The beginning
of that segment contains pages with the old timeline ID, and we don't accept
that in recovery unless we find a history file covering the old timeline ID.
If you omit pg_xlog from the base backup and clear the archive directory
before starting the backup, there will be no such history file available.

The bug is present in all versions since PITR was introduced in 8.0, but I'm
back-patching only back to 8.2. Earlier versions didn't have XLOG switch
records, making this fix unfeasible. Given the lack of reports until now,
it doesn't seem worthwhile to spend more effort to fix 8.0 and 8.1.

Per report and suggestion by Mikael Krantz

it fails because the shared memory segment already exists. This
means it can take up to 10 seconds before it reports the error
if it *does* exist, but hopefully it will make the system capable
of restarting even when the server is under high load.