Tom Lane [Sun, 8 May 2022 16:36:38 +0000 (12:36 -0400)]
Release notes for 14.3, 13.7, 12.11, 11.16, 10.21.
Noah Misch [Sat, 7 May 2022 16:12:56 +0000 (09:12 -0700)]
Fix back-patch of "Under has_wal_read_bug, skip .../001_wal.pl."
Per buildfarm members tadarida, snapper, and kittiwake. Back-patch to
v10 (all supported versions).
Noah Misch [Sat, 7 May 2022 07:33:15 +0000 (00:33 -0700)]
Under has_wal_read_bug, skip contrib/bloom/t/001_wal.pl.
Per buildfarm members snapper and kittiwake. Back-patch to v10 (all
supported versions).
Discussion: https://postgr.es/m/
20220116210241[email protected]
Andres Freund [Fri, 6 May 2022 16:01:08 +0000 (09:01 -0700)]
Temporarily skip recovery deadlock test in back branches.
The recovery deadlock test has a timing issue that was fixed in
5136967f1eb in
HEAD. Unfortunately the same fix doesn't quite work in the back branches: 1)
adjust_conf() doesn't exist, which is easy enough to work around 2) a restart
cleares the recovery conflict stats < 15.
These issues can be worked around, but given the upcoming set of minor
releases, skip the problematic test for now. The buildfarm doesn't show
failures in other parts of 031_recovery_conflict.pl.
Discussion: https://postgr.es/m/
20220506155827[email protected]
Backpatch: 10-14
Andres Freund [Fri, 6 May 2022 15:39:07 +0000 (08:39 -0700)]
Backpatch addition of pump_until() more completely.
In
a2ab9c06ea1 I just backpatched the introduction of pump_until(), without
changing the existing local definitions (as
6da65a3f9a9). The necessary
changes seemed more verbose than desirable. However, that leads to warnings,
as I failed to realize...
Backpatch to all versions containing pump_until() calls before
f74496dd611 (there's none in 10).
Discussion: https://postgr.es/m/
2808491.
1651802860@sss.pgh.pa.us
Discussion: https://postgr.es/m/
18b37361-b482-b9d8-f30d-
6115cd5ce25c@enterprisedb.com
Backpatch: 11-14
Tom Lane [Thu, 5 May 2022 18:54:53 +0000 (14:54 -0400)]
Update time zone data files to tzdata release 2022a.
DST law changes in Palestine. Historical corrections for
Chile and Ukraine.
Andres Freund [Wed, 4 May 2022 21:16:41 +0000 (14:16 -0700)]
Revert "Fix timing issue in deadlock recovery conflict test."
This reverts commit
8a3a8d9f103e360fffc02089810a520e22521ae2.
Andres Freund [Wed, 4 May 2022 19:50:38 +0000 (12:50 -0700)]
Fix timing issue in deadlock recovery conflict test.
Per buildfarm members longfin and skink.
Discussion: https://postgr.es/m/
20220413002626[email protected]
Backpatch: 10-
Andres Freund [Tue, 3 May 2022 01:29:35 +0000 (18:29 -0700)]
Backpatch 031_recovery_conflict.pl.
The prior commit showed that the introduction of recovery conflict tests was a
good idea. Without these tests it's hard to know that the fix didn't break
something...
031_recovery_conflict.pl was introduced in
9f8a050f68d and extended in
21e184403bf.
Discussion: https://postgr.es/m/
20220413002626[email protected]
Backpatch: 10-14
Andres Freund [Tue, 3 May 2022 01:25:00 +0000 (18:25 -0700)]
Fix possibility of self-deadlock in ResolveRecoveryConflictWithBufferPin().
The tests added in
9f8a050f68d failed nearly reliably on FreeBSD in CI, and
occasionally on the buildfarm. That turns out to be caused not by a bug in the
test, but by a longstanding bug in recovery conflict handling.
The standby timeout handler, used by ResolveRecoveryConflictWithBufferPin(),
executed SendRecoveryConflictWithBufferPin() inside a signal handler. A bad
idea, because the deadlock timeout handler (or a spurious latch set) could
have interrupted ProcWaitForSignal(). If unlucky that could cause a
self-deadlock on ProcArrayLock, if the deadlock check is in
SendRecoveryConflictWithBufferPin()->CancelDBBackends().
To fix, set a flag in StandbyTimeoutHandler(), and check the flag in
ResolveRecoveryConflictWithBufferPin().
Subsequently the recovery conflict tests will be backpatched.
Discussion: https://postgr.es/m/
20220413002626[email protected]
Backpatch: 10-
Andres Freund [Tue, 3 May 2022 01:09:43 +0000 (18:09 -0700)]
Backpatch addition of wait_for_log(), pump_until().
These were originally introduced in
a2ab9c06ea1 and
a2ab9c06ea1, as they are
needed by a about-to-be-backpatched test.
Discussion: https://postgr.es/m/
20220413002626[email protected]
Backpatch: 10-14
Etsuro Fujita [Mon, 2 May 2022 07:45:04 +0000 (16:45 +0900)]
Fix typo in comment.
Andrew Dunstan [Mon, 25 Apr 2022 19:02:13 +0000 (15:02 -0400)]
Inhibit mingw CRT's auto-globbing of command line arguments
For some reason by default the mingw C Runtime takes it upon itself to
expand program arguments that look like shell globbing characters. That
has caused much scratching of heads and mis-attribution of the causes of
some TAP test failures, so stop doing that.
This removes an inconsistency with Windows binaries built with MSVC,
which have no such behaviour.
Per suggestion from Noah Misch.
Backpatch to all live branches.
Discussion: https://postgr.es/m/
20220423025927[email protected]
Tom Lane [Thu, 21 Apr 2022 21:58:52 +0000 (17:58 -0400)]
Remove inadequate assertion check in CTE inlining.
inline_cte() expected to find exactly as many references to the
target CTE as its cterefcount indicates. While that should be
accurate for the tree as emitted by the parser, there are some
optimizations that occur upstream of here that could falsify it,
notably removal of unused subquery output expressions.
Trying to make the accounting 100% accurate seems expensive and
doomed to future breakage. It's not really worth it, because
all this code is protecting is downstream assumptions that every
referenced CTE has a plan. Let's convert those assertions to
regular test-and-elog just in case there's some actual problem,
and then drop the failing assertion.
Per report from Tomas Vondra (thanks also to Richard Guo for
analysis). Back-patch to v12 where the faulty code came in.
Discussion: https://postgr.es/m/
29196a1e-ed47-c7ca-9be2-
b1c636816183@enterprisedb.com
Andrew Dunstan [Thu, 21 Apr 2022 13:20:00 +0000 (09:20 -0400)]
Support new perl module namespace in stable branches
Commit
b3b4d8e68a moved our perl test modules to a better namespace
structure, but this has made life hard for people wishing to backpatch
improvements in the TAP tests. Here we alleviate much of that difficulty
by implementing the new module names on top of the old modules, mostly
by using a little perl typeglob aliasing magic, so that we don't have a
dual maintenance burden. This should work both for the case where a new
test is backpatched and the case where a fix to an existing test that
uses the new namespace is backpatched.
Reviewed by Michael Paquier
Per complaint from Andres Freund
Discussion: https://postgr.es/m/
20220418141530[email protected]
Applied to branches 10 through 14
Peter Geoghegan [Thu, 21 Apr 2022 00:17:39 +0000 (17:17 -0700)]
Fix CLUSTER tuplesorts on abbreviated expressions.
CLUSTER sort won't use the datum1 SortTuple field when clustering
against an index whose leading key is an expression. This makes it
unsafe to use the abbreviated keys optimization, which was missed by the
logic that sets up SortSupport state. Affected tuplesorts output tuples
in a completely bogus order as a result (the wrong SortSupport based
comparator was used for the leading attribute).
This issue is similar to the bug fixed on the master branch by recent
commit
cc58eecc5d. But it's a far older issue, that dates back to the
introduction of the abbreviated keys optimization by commit
4ea51cdfe8.
Backpatch to all supported versions.
Author: Peter Geoghegan
Author: Thomas Munro
Discussion: https://postgr.es/m/CA+hUKG+bA+bmwD36_oDxAoLrCwZjVtST2fqe=b4=qZcmU7u89A@mail.gmail.com
Backpatch: 10-
Tom Lane [Wed, 20 Apr 2022 22:08:15 +0000 (18:08 -0400)]
Disallow infinite endpoints in generate_series() for timestamps.
Such cases will lead to infinite loops, so they're of no practical
value. The numeric variant of generate_series() already threw error
for this, so borrow its message wording.
Per report from Richard Wesley. Back-patch to all supported branches.
Discussion: https://postgr.es/m/
91B44E7B-68D5-448F-95C8-
B4B3B0F5DEAF@duckdblabs.com
Tom Lane [Wed, 20 Apr 2022 03:03:59 +0000 (23:03 -0400)]
Fix breakage in AlterFunction().
An ALTER FUNCTION command that tried to update both the function's
proparallel property and its proconfig list failed to do the former,
because it stored the new proparallel value into a tuple that was
no longer the interesting one. Carelessness in
7aea8e4f2.
(I did not bother with a regression test, because the only likely
future breakage would be for someone to ignore the comment I added
and add some other field update after the heap_modify_tuple step.
A test using existing function properties could not catch that.)
Per report from Bryn Llewellyn. Back-patch to all supported branches.
Discussion: https://postgr.es/m/
8AC9A37F-99BD-446F-A2F7-
B89AD0022774@yugabyte.com
Amit Kapila [Tue, 19 Apr 2022 03:38:05 +0000 (09:08 +0530)]
Fix the check to limit sync workers.
We don't allow to invoke more sync workers once we have reached the sync
worker limit per subscription. But the check to enforce this also doesn't
allow to launch an apply worker if it gets restarted.
This code was introduced by commit
de43897122 but we caught the problem
only with the test added by recent commit
c91f71b9dc which started failing
occasionally in the buildfarm.
As per buildfarm.
Diagnosed-by: Amit Kapila, Masahiko Sawada, Tomas Vondra
Author: Amit Kapila
Backpatch-through: 10
Discussion: https://postgr.es/m/CAH2L28vddB_NFdRVpuyRBJEBWjz4BSyTB=_ektNRH8NJ1jf95g@mail.gmail.com
https://postgr.es/m/
f90d2b03-4462-ce95-a524-
d91464e797c8@enterprisedb.com
Tom Lane [Mon, 18 Apr 2022 16:16:45 +0000 (12:16 -0400)]
Avoid invalid array reference in transformAlterTableStmt().
Don't try to look at the attidentity field of system attributes,
because they're not there in the TupleDescAttr array. Sometimes
this is harmless because we accidentally pick up a zero, but
otherwise we'll report "no owned sequence found" from an attempt
to alter a system attribute. (It seems possible that a SIGSEGV
could occur, too, though I've not seen it in testing.)
It's not in this function's charter to complain that you can't
alter a system column, so instead just hard-wire an assumption
that system attributes aren't identities. I didn't bother with
a regression test because the appearance of the bug is very
erratic.
Per bug #17465 from Roman Zharkov. Back-patch to all supported
branches. (There's not actually a live bug before v12, because
before that get_attidentity() did the right thing anyway.
But for consistency I changed the test in the older branches too.)
Discussion: https://postgr.es/m/17465-
f2a554a6cb5740d3@postgresql.org
Michael Paquier [Mon, 18 Apr 2022 02:40:18 +0000 (11:40 +0900)]
Fix race in TAP test 002_archiving.pl when restoring history file
This test, introduced in
df86e52, uses a second standby to check that
it is able to remove correctly RECOVERYHISTORY and RECOVERYXLOG at the
end of recovery. This standby uses the archives of the primary to
restore its contents, with some of the archive's contents coming from
the first standby previously promoted. In slow environments, it was
possible that the test did not check what it should, as the history file
generated by the promotion of the first standby may not be stored yet on
the archives the second standby feeds on. So, it could be possible that
the second standby selects an incorrect timeline, without restoring a
history file at all.
This commits adds a wait phase to make sure that the history file
required by the second standby is archived before this cluster is
created. This relies on poll_query_until() with pg_stat_file() and an
absolute path, something not supported in REL_10_STABLE.
While on it, this adds a new test to check that the history file has
been restored by looking at the logs of the second standby. This
ensures that a RECOVERYHISTORY, whose removal needs to be checked,
is created in the first place. This should make the test more robust.
This test has been introduced by
df86e52, but it came in light as an
effect of the bug fixed by
acf1dd42, where the extra restore_command
calls made the test much slower.
Reported-by: Andres Freund
Discussion: https://postgr.es/m/
[email protected]
Backpatch-through: 11
Noah Misch [Sun, 17 Apr 2022 00:43:54 +0000 (17:43 -0700)]
Add a temp-install prerequisite to src/interfaces/ecpg "checktcp".
The target failed, tested $PATH binaries, or tested a stale temporary
installation. Commit
c66b438db62748000700c9b90b585e756dd54141 missed
this. Back-patch to v10 (all supported versions).
Robert Haas [Thu, 14 Apr 2022 15:10:11 +0000 (11:10 -0400)]
Rethink the delay-checkpoint-end mechanism in the back-branches.
The back-patch of commit
bbace5697df12398e87ffd9879171c39d27f5b33 had
the unfortunate effect of changing the layout of PGPROC in the
back-branches, which could break extensions. This happened because it
changed the delayChkpt from type bool to type int. So, change it back,
and add a new bool delayChkptEnd field instead. The new field should
fall within what used to be padding space within the struct, and so
hopefully won't cause any extensions to break.
Per report from Markus Wanner and discussion with Tom Lane and others.
Patch originally by me, somewhat revised by Markus Wanner per a
suggestion from Michael Paquier. A very similar patch was developed
by Kyotaro Horiguchi, but I failed to see the email in which that was
posted before writing one of my own.
Discussion: http://postgr.es/m/CA+Tgmoao-kUD9c5nG5sub3F7tbo39+cdr8jKaOVEs_1aBWcJ3Q@mail.gmail.com
Discussion: http://postgr.es/m/
20220406.164521.
17171257901083417[email protected]
Michael Paquier [Thu, 14 Apr 2022 06:09:36 +0000 (15:09 +0900)]
pageinspect: Fix handling of all-zero pages
Getting from get_raw_page() an all-zero page is considered as a valid
case by the buffer manager and it can happen for example when finding a
corrupted page with zero_damaged_pages enabled (using zero_damaged_pages
to look at corrupted pages happens), or after a crash when a relation
file is extended before any WAL for its new data is generated (before a
vacuum or autovacuum job comes in to do some cleanup).
However, all the functions of pageinspect, as of the index AMs (except
hash that has its own idea of new pages), heap, the FSM or the page
header have never worked with all-zero pages, causing various crashes
when going through the page internals.
This commit changes all the pageinspect functions to be compliant with
all-zero pages, where the choice is made to return NULL or no rows for
SRFs when finding a new page. get_raw_page() still works the same way,
returning a batch of zeros in the bytea of the page retrieved. A hard
error could be used but NULL, while more invasive, is useful when
scanning relation files in full to get a batch of results for a single
relation in one query. Tests are added for all the code paths
impacted.
Reported-by: Daria Lepikhova
Author: Michael Paquier
Discussion: https://postgr.es/m/
561e187b-3549-c8d5-03f5-
525c14e65bd0@postgrespro.ru
Backpatch-through: 10
Tom Lane [Wed, 13 Apr 2022 17:35:02 +0000 (13:35 -0400)]
Prevent access to no-longer-pinned buffer in heapam_tuple_lock().
heap_fetch() used to have a "keep_buf" parameter that told it to return
ownership of the buffer pin to the caller after finding that the
requested tuple TID exists but is invisible to the specified snapshot.
This was thoughtlessly removed in commit
5db6df0c0, which broke
heapam_tuple_lock() (formerly EvalPlanQualFetch) because that function
needs to do more accesses to the tuple even if it's invisible. The net
effect is that we would continue to touch the page for a microsecond or
two after releasing pin on the buffer. Usually no harm would result;
but if a different session decided to defragment the page concurrently,
we could see garbage data and mistakenly conclude that there's no newer
tuple version to chain up to. (It's hard to say whether this has
happened in the field. The bug was actually found thanks to a later
change that allowed valgrind to detect accesses to non-pinned buffers.)
The most reasonable way to fix this is to reintroduce keep_buf,
although I made it behave slightly differently: buffer ownership
is passed back only if there is a valid tuple at the requested TID.
In HEAD, we can just add the parameter back to heap_fetch().
To avoid an API break in the back branches, introduce an additional
function heap_fetch_extended() in those branches.
In HEAD there is an additional, less obvious API change: tuple->t_data
will be set to NULL in all cases where buffer ownership is not returned,
in particular when the tuple exists but fails the time qual (and
!keep_buf). This is to defend against any other callers attempting to
access non-pinned buffers. We concluded that making that change in back
branches would be more likely to introduce problems than cure any.
In passing, remove a comment about heap_fetch that was obsoleted by
9a8ee1dc6.
Per bug #17462 from Daniil Anisimov. Back-patch to v12 where the bug
was introduced.
Discussion: https://postgr.es/m/17462-
9c98a0f00df9bd36@postgresql.org
David Rowley [Tue, 12 Apr 2022 23:20:06 +0000 (11:20 +1200)]
Docs: adjust pg_upgrade syntax to mark -B as optional
This was made optional in
959f6d6a1.
Author: Justin Pryzby
Discussion: https://postgr.es/m/
20220411020336[email protected]
Backpatch-through: 13, where -B was made optional
Tom Lane [Tue, 12 Apr 2022 22:21:04 +0000 (18:21 -0400)]
Doc: tweak textsearch.sgml for SEO purposes.
Google seems to like to return textsearch.html for queries about
GIN and GiST indexes, even though it's not a primary reference
for either. It seems likely that that's because those keywords
appear in the page title. Since "GIN and GiST Index Types" is
not a very apposite title for this material anyway, rename the
section in hopes of stopping that.
Also provide explicit links to the GIN and GiST chapters, to help
anyone who finds their way to this page regardless.
Per gripe from Jan Piotrowski. Back-patch to supported branches.
(Unfortunately Google is likely to continue returning the 9.1
version of this page, but improving that situation is a matter
for the www team.)
Discussion: https://postgr.es/m/
164978902252.
1276550.
9330175733459697101@wrigleys.postgresql.org
David Rowley [Tue, 12 Apr 2022 21:17:17 +0000 (09:17 +1200)]
Docs: avoid confusing use of the word "synchronized"
It's misleading to call the data directory the "synchronized data
directory" when discussing a crash scenario when using pg_rewind's
--no-sync option. Here we just remove the word "synchronized" to avoid
any possible confusion.
Author: Justin Pryzby
Discussion: https://postgr.es/m/
20220411020336[email protected]
Backpatch-through: 12, where --no-sync was added
Tom Lane [Wed, 6 Apr 2022 21:03:35 +0000 (17:03 -0400)]
Suppress "variable 'pagesaving' set but not used" warning.
With asserts disabled, late-model clang notices that this variable
is incremented but never otherwise read.
Discussion: https://postgr.es/m/
3171401.
1649275153@sss.pgh.pa.us
Peter Eisentraut [Sat, 2 Apr 2022 05:27:26 +0000 (07:27 +0200)]
Remove obsolete comment
accidentally left behind by
4cb658af70027c3544fb843d77b2e84028762747
Tom Lane [Thu, 31 Mar 2022 18:29:24 +0000 (14:29 -0400)]
Fix postgres_fdw to check shippability of sort clauses properly.
postgres_fdw would push ORDER BY clauses to the remote side without
verifying that the sort operator is safe to ship. Moreover, it failed
to print a suitable USING clause if the sort operator isn't default
for the sort expression's type. The net result of this is that the
remote sort might not have anywhere near the semantics we expect,
which'd be disastrous for locally-performed merge joins in particular.
We addressed similar issues in the context of ORDER BY within an
aggregate function call in commit
7012b132d, but failed to notice
that query-level ORDER BY was broken. Thus, much of the necessary
logic already existed, but it requires refactoring to be usable
in both cases.
Back-patch to all supported branches. In HEAD only, remove the
core code's copy of find_em_expr_for_rel, which is no longer used
and really should never have been pushed into equivclass.c in the
first place.
Ronan Dunklau, per report from David Rowley;
reviews by David Rowley, Ranier Vilela, and myself
Discussion: https://postgr.es/m/CAApHDvr4OeC2DBVY--zVP83-K=bYrTD7F8SZDhN4g+pj2f2S-A@mail.gmail.com
Tom Lane [Thu, 31 Mar 2022 15:24:26 +0000 (11:24 -0400)]
Add missing newline in one libpq error message.
Oversight in commit
a59c79564. Back-patch, as that was.
Noted by Peter Eisentraut.
Discussion: https://postgr.es/m/
7f85ef6d-250b-f5ec-9867-
89f0b16d019f@enterprisedb.com
Daniel Gustafsson [Thu, 31 Mar 2022 10:03:33 +0000 (12:03 +0200)]
doc: Fix typo in ANALYZE documentation
Commit
61fa6ca79b3 accidentally wrote constrast instead of contrast.
Backpatch-through: 10
Discussion: https://postgr.es/m/
88903179-5ce2-3d4d-af43-
7830372bdcb6@enterprisedb.com
Etsuro Fujita [Wed, 30 Mar 2022 10:00:04 +0000 (19:00 +0900)]
Fix typo in comment.
Alvaro Herrera [Tue, 29 Mar 2022 13:36:21 +0000 (15:36 +0200)]
Revert "Fix replay of create database records on standby"
This reverts commit
49d9cfc68bf4. The approach taken by this patch has
problems, so we'll come up with a radically different fix.
Discussion: https://postgr.es/m/CA+TgmoYcUPL+WOJL2ZzhH=zmrhj0iOQ=iCFM0SuYqBbqZEamEg@mail.gmail.com
Tomas Vondra [Mon, 28 Mar 2022 12:27:36 +0000 (14:27 +0200)]
Document autoanalyze limitations for partitioned tables
When dealing with partitioned tables, counters for partitioned tables
are not updated when modifying child tables. This means autoanalyze may
not update optimizer statistics for the parent relations, which can
result in poor plans for some queries.
It's worth documenting this limitation, so that people are aware of it
and can take steps to mitigate it (e.g. by setting up a script executing
ANALYZE regularly).
Backpatch to v10. Older branches are affected too, of couse, but we no
longer maintain those.
Author: Justin Pryzby
Reviewed-by: Zhihong Yu, Tomas Vondra
Backpatch-through: 10
Discussion: https://postgr.es/m/
20210913035409.GA10647%40telsasoft.com
Andres Freund [Wed, 23 Mar 2022 23:38:43 +0000 (16:38 -0700)]
waldump: fix use-after-free in search_directory().
After closedir() dirent->d_name is not valid anymore. As there alerady are a
few places relying on the limited lifetime of pg_waldump, do so here as well,
and just pg_strdup() the string.
The bug was introduced in
fc49e24fa69a.
Found by UBSan, run locally.
Backpatch: 11-, like
fc49e24fa69 itself.
Tom Lane [Sun, 27 Mar 2022 16:57:46 +0000 (12:57 -0400)]
Fix breakage of get_ps_display() in the PS_USE_NONE case.
Commit
8c6d30f21 caused this function to fail to set *displen
in the PS_USE_NONE code path. If the variable's previous value
had been negative, that'd lead to a memory clobber at some call
sites. We'd managed not to notice due to very thin test coverage
of such configurations, but this appears to explain buildfarm member
lorikeet's recent struggles.
Credit to Andrew Dunstan for spotting the problem. Back-patch
to v13 where the bug was introduced.
Discussion: https://postgr.es/m/136102.
1648320427@sss.pgh.pa.us
Michael Paquier [Sun, 27 Mar 2022 08:53:55 +0000 (17:53 +0900)]
pageinspect: Add more sanity checks to prevent out-of-bound reads
A couple of code paths use the special area on the page passed by the
function caller, expecting to find some data in it. However, feeding
an incorrect page can lead to out-of-bound reads when trying to access
the page special area (like a heap page that has no special area,
leading PageGetSpecialPointer() to grab a pointer outside the allocated
page).
The functions used for hash and btree indexes have some protection
already against that, while some other functions using a relation OID
as argument would make sure that the access method involved is correct,
but functions taking in input a raw page without knowing the relation
the page is attached to would run into problems.
This commit improves the set of checks used in the code paths of BRIN,
btree (including one check if a leaf page is found with a non-zero
level), GIN and GiST to verify that the page given in input has a
special area size that fits with each access method, which is done
though PageGetSpecialSize(), becore calling PageGetSpecialPointer().
The scope of the checks done is limited to work with pages that one
would pass after getting a block with get_raw_page(), as it is possible
to craft byteas that could bypass existing code paths. Having too many
checks would also impact the usability of pageinspect, as the existing
code is very useful to look at the content details in a corrupted page,
so the focus is really to avoid out-of-bound reads as this is never a
good thing even with functions whose execution is limited to
superusers.
The safest approach could be to rework the functions so as these fetch a
block using a relation OID and a block number, but there are also cases
where using a raw page is useful.
Tests are added to cover all the code paths that needed such checks, and
an error message for hash indexes is reworded to fit better with what
this commit adds.
Reported-By: Alexander Lakhin
Author: Julien Rouhaud, Michael Paquier
Discussion: https://postgr.es/m/16527-
ef7606186f0610a1@postgresql.org
Discussion: https://postgr.es/m/
561e187b-3549-c8d5-03f5-
525c14e65bd0@postgrespro.ru
Backpatch-through: 10
Tom Lane [Sat, 26 Mar 2022 18:29:29 +0000 (14:29 -0400)]
Suppress compiler warning in relptr_store().
clang 13 with -Wextra warns that "performing pointer subtraction with
a null pointer has undefined behavior" in the places where freepage.c
tries to set a relptr variable to constant NULL. This appears to be
a compiler bug, but it's unlikely to get fixed instantly. Fortunately,
we can work around it by introducing an inline support function, which
seems like a good change anyway because it removes the macro's existing
double-evaluation hazard.
Backpatch to v10 where this code was introduced.
Patch by me, based on an idea of Andres Freund's.
Discussion: https://postgr.es/m/48826.
1648310694@sss.pgh.pa.us
Tom Lane [Fri, 25 Mar 2022 18:23:26 +0000 (14:23 -0400)]
Harden TAP tests that intentionally corrupt page checksums.
The previous method for doing that was to write zeroes into a
predetermined set of page locations. However, there's a roughly
1-in-64K chance that the existing checksum will match by chance,
and yesterday several buildfarm animals started to reproducibly
see that, resulting in test failures because no checksum mismatch
was reported.
Since the checksum includes the page LSN, test success depends on
the length of the installation's WAL history, which is affected by
(at least) the initial catalog contents, the set of locales installed
on the system, and the length of the pathname of the test directory.
Sooner or later we were going to hit a chance match, and today is
that day.
Harden these tests by specifically inverting the checksum field and
leaving all else alone, thereby guaranteeing that the checksum is
incorrect.
In passing, fix places that were using seek() to set up for syswrite(),
a combination that the Perl docs very explicitly warn against. We've
probably escaped problems because no regular buffered I/O is done on
these filehandles; but if it ever breaks, we wouldn't deserve or get
much sympathy.
Although we've only seen problems in HEAD, now that we recognize the
environmental dependencies it seems like it might be just a matter
of time until someone manages to hit this in back-branch testing.
Hence, back-patch to v11 where we started doing this kind of test.
Discussion: https://postgr.es/m/
3192026.
1648185780@sss.pgh.pa.us
Alvaro Herrera [Fri, 25 Mar 2022 12:16:21 +0000 (13:16 +0100)]
Fix replay of create database records on standby
Crash recovery on standby may encounter missing directories when
replaying create database WAL records. Prior to this patch, the standby
would fail to recover in such a case. However, the directories could be
legitimately missing. Consider a sequence of WAL records as follows:
CREATE DATABASE
DROP DATABASE
DROP TABLESPACE
If, after replaying the last WAL record and removing the tablespace
directory, the standby crashes and has to replay the create database
record again, the crash recovery must be able to move on.
This patch adds a mechanism similar to invalid-page tracking, to keep a
tally of missing directories during crash recovery. If all the missing
directory references are matched with corresponding drop records at the
end of crash recovery, the standby can safely continue following the
primary.
Backpatch to 13, at least for now. The bug is older, but fixing it in
older branches requires more careful study of the interactions with
commit
e6d8069522c8, which appeared in 13.
A new TAP test file is added to verify the condition. However, because
it depends on commit
d6d317dbf615, it can only be added to branch
master. I (Álvaro) manually verified that the code behaves as expected
in branch 14. It's a bit nervous-making to leave the code uncovered by
tests in older branches, but leaving the bug unfixed is even worse.
Also, the main reason this fix took so long is precisely that we
couldn't agree on a good strategy to approach testing for the bug, so
perhaps this is the best we can do.
Diagnosed-by: Paul Guo
Author: Paul Guo
Author: Kyotaro Horiguchi
Author: Asim R Praveen
Discussion: https://postgr.es/m/CAEET0ZGx9AvioViLf7nbR_8tH9-=27DN5xWJ2P9-ROH16e4JUA@mail.gmail.com
Robert Haas [Thu, 24 Mar 2022 18:36:06 +0000 (14:36 -0400)]
Fix possible recovery trouble if TRUNCATE overlaps a checkpoint.
If TRUNCATE causes some buffers to be invalidated and thus the
checkpoint does not flush them, TRUNCATE must also ensure that the
corresponding files are truncated on disk. Otherwise, a replay
from the checkpoint might find that the buffers exist but have
the wrong contents, which may cause replay to fail.
Report by Teja Mupparti. Patch by Kyotaro Horiguchi, per a design
suggestion from Heikki Linnakangas, with some changes to the
comments by me. Review of this and a prior patch that approached
the issue differently by Heikki Linnakangas, Andres Freund, Álvaro
Herrera, Masahiko Sawada, and Tom Lane.
Discussion: http://postgr.es/m/BYAPR06MB6373BF50B469CA393C614257ABF00@BYAPR06MB6373.namprd06.prod.outlook.com
Andres Freund [Wed, 23 Mar 2022 20:05:59 +0000 (13:05 -0700)]
Don't try to translate NULL in GetConfigOptionByNum().
Noticed via -fsanitize=undefined. Introduced when a few columns in
GetConfigOptionByNum() / pg_settings started to be translated in
72be8c29a /
PG 12.
Backpatch to all affected branches, for the same reasons as
46ab07ffda9.
Discussion: https://postgr.es/m/
20220323173537[email protected]
Backpatch: 12-
Andres Freund [Wed, 23 Mar 2022 20:05:25 +0000 (13:05 -0700)]
Don't call fwrite() with len == 0 when writing out relcache init file.
Noticed via -fsanitize=undefined.
Backpatch to all branches, for the same reasons as
46ab07ffda9.
Discussion: https://postgr.es/m/
20220323173537[email protected]
Backpatch: 10-
Andres Freund [Wed, 23 Mar 2022 19:43:14 +0000 (12:43 -0700)]
configure: check for dlsym instead of dlopen.
When building with sanitizers the sanitizer library provides dlopen, but not
dlsym(), making configure think that -ldl isn't needed. Just checking for
dlsym() ought to suffice, hard to see dlsym() being provided without dlopen()
also being provided.
Backpatch to all branches, for the same reasons as
46ab07ffda9.
Reviewed-By: Tom Lane
Discussion: https://postgr.es/m/
20220323173537[email protected]
Backpatch: 10-
Alvaro Herrera [Wed, 23 Mar 2022 18:23:51 +0000 (19:23 +0100)]
pg_upgrade: Upgrade an Assert to a real 'if' test
It seems possible for the condition being tested to be true in
production, and nobody would never know (except when some data
eventually becomes corrupt?).
Author: Álvaro Herrera
Discussion: https://postgr.es/m//202109040001[email protected]
Alvaro Herrera [Wed, 23 Mar 2022 17:22:10 +0000 (18:22 +0100)]
Fix "missing continuation record" after standby promotion
Invalidate abortedRecPtr and missingContrecPtr after a missing
continuation record is successfully skipped on a standby. This fixes a
PANIC caused when a recently promoted standby attempts to write an
OVERWRITE_RECORD with an LSN of the previously read aborted record.
Backpatch to 10 (all stable versions).
Author: Sami Imseih
Reviewed-by: Kyotaro Horiguchi
Reviewed-by: Álvaro Herrera
Discussion: https://postgr.es/m/44D259DE-7542-49C4-8A52-2AB01534DCA9@amazon.com
Thomas Munro [Wed, 23 Mar 2022 01:31:18 +0000 (14:31 +1300)]
Try to stabilize vacuum test.
As commits
b700f96c and
3414099c did for the reloptions test, make
sure VACUUM can always truncate the table as expected.
Back-patch to 12, where vacuum_truncate arrived.
Discussion: https://postgr.es/m/CAD21AoCNoWjYkdEtr%2BVDoF9v__V905AedKZ9iF%3DArgCtrbxZqw%40mail.gmail.com
Andres Freund [Tue, 22 Mar 2022 15:22:02 +0000 (08:22 -0700)]
Add missing dependency of pg_dumpall to WIN32RES.
When cross-building to windows, or building with mingw on windows, the build
could fail with
x86_64-w64-mingw32-gcc: error: win32ver.o: No such file or director
because pg_dumpall didn't depend on WIN32RES, but it's recipe references
it. The build nevertheless succeeded most of the time, due to
pg_dump/pg_restore having the required dependency, causing win32ver.o to be
built.
Reported-By: Thomas Munro
Discussion: https://postgr.es/m/CA+hUKGJeekpUPWW6yCVdf9=oBAcCp86RrBivo4Y4cwazAzGPng@mail.gmail.com
Backpatch: 10-, omission present on all live branches
Michael Paquier [Tue, 22 Mar 2022 04:21:39 +0000 (13:21 +0900)]
Fix failures in SSL tests caused by out-of-tree keys and certificates
This issue is environment-sensitive, where the SSL tests could fail in
various way by feeding on defaults provided by sslcert, sslkey,
sslrootkey, sslrootcert, sslcrl and sslcrldir coming from a local setup,
as of ~/.postgresql/ by default. Horiguchi-san has reported two
failures, but more advanced testing from me (aka inclusion of garbage
SSL configuration in ~/.postgresql/ for all the configuration
parameters) has showed dozens of failures that can be triggered in the
whole test suite.
History has showed that we are not good when it comes to address such
issues, fixing them locally like in
dd87799, and such problems keep
appearing. This commit strengthens the entire test suite to put an end
to this set of problems by embedding invalid default values in all the
connection strings used in the tests. The invalid values are prefixed
in each connection string, relying on the follow-up values passed in the
connection string to enforce any invalid value previously set. Note
that two tests related to CRLs are required to fail with certain pre-set
configurations, but we can rely on enforcing an empty value instead
after the invalid set of values.
Reported-by: Kyotaro Horiguchi
Reviewed-by: Andrew Dunstan, Daniel Gustafsson, Kyotaro Horiguchi
Discussion: https://postgr.es/m/
20220316.163658.
1122740600489097632[email protected]
backpatch-through: 10
Tom Lane [Mon, 21 Mar 2022 21:44:29 +0000 (17:44 -0400)]
Fix assorted missing logic for GroupingFunc nodes.
The planner needs to treat GroupingFunc like Aggref for many purposes,
in particular with respect to processing of the argument expressions,
which are not to be evaluated at runtime. A few places hadn't gotten
that memo, notably including subselect.c's processing of outer-level
aggregates. This resulted in assertion failures or wrong plans for
cases in which a GROUPING() construct references an outer aggregation
level.
Also fix missing special cases for GroupingFunc in cost_qual_eval
(resulting in wrong cost estimates for GROUPING(), although it's
not clear that that would affect plan shapes in practice) and in
ruleutils.c (resulting in excess parentheses in pretty-print mode).
Per bug #17088 from Yaoguang Chen. Back-patch to all supported
branches.
Richard Guo, Tom Lane
Discussion: https://postgr.es/m/17088-
e33882b387de7f5c@postgresql.org
Tom Lane [Mon, 21 Mar 2022 16:22:13 +0000 (12:22 -0400)]
Fix risk of deadlock failure while dropping a partitioned index.
DROP INDEX needs to lock the index's table before the index itself,
else it will deadlock against ordinary queries that acquire the
relation locks in that order. This is correctly mechanized for
plain indexes by RangeVarCallbackForDropRelation; but in the case of
a partitioned index, we neglected to lock the child tables in advance
of locking the child indexes. We can fix that by traversing the
inheritance tree and acquiring the needed locks in RemoveRelations,
after we have acquired our locks on the parent partitioned table and
index.
While at it, do some refactoring to eliminate confusion between
the actual and expected relkind in RangeVarCallbackForDropRelation.
We can save a couple of syscache lookups too, by having that function
pass back info that RemoveRelations will need.
Back-patch to v11 where partitioned indexes were added.
Jimmy Yih, Gaurab Dey, Tom Lane
Discussion: https://postgr.es/m/BYAPR05MB645402330042E17D91A70C12BD5F9@BYAPR05MB6454.namprd05.prod.outlook.com
Tom Lane [Sun, 20 Mar 2022 16:39:40 +0000 (12:39 -0400)]
Doc: fix our example systemd script.
The example used "TimeoutSec=0", but systemd's documented way to get
the desired effect is "TimeoutSec=infinity".
Discussion: https://postgr.es/m/
164770078557.670.
5467111518383664377@wrigleys.postgresql.org
Michael Paquier [Sat, 19 Mar 2022 07:37:43 +0000 (16:37 +0900)]
doc: Mention SET TABLESPACE clause for ALTER MATERIALIZED VIEW
This command flavor is supported, but there was nothing in the
documentation about it.
Author: Yugo Nagata
Discussion: https://postgr.es/m/
20220316133337.
5dc9740abfa24c25ec9f67f5@sraoss.co.jp
Backpatch-through: 10
Tom Lane [Fri, 18 Mar 2022 20:01:42 +0000 (16:01 -0400)]
Fix incorrect xmlschema output for types timetz and timestamptz.
The output of table_to_xmlschema() and allied functions includes
a regex describing valid values for these types ... but the regex
was itself invalid, as it failed to escape a literal "+" sign.
Report and fix by Renan Soares Lopes. Back-patch to all
supported branches.
Discussion: https://postgr.es/m/
7f6fabaa-3f8f-49ab-89ca-
59fbfe633105@me.com
Tom Lane [Thu, 17 Mar 2022 22:18:05 +0000 (18:18 -0400)]
Revert applying column aliases to the output of whole-row Vars.
In commit
bf7ca1587, I had the bright idea that we could make the
result of a whole-row Var (that is, foo.*) track any column aliases
that had been applied to the FROM entry the Var refers to. However,
that's not terribly logically consistent, because now the output of
the Var is no longer of the named composite type that the Var claims
to emit.
bf7ca1587 tried to handle that by changing the output
tuple values to be labeled with a blessed RECORD type, but that's
really pretty disastrous: we can wind up storing such tuples onto
disk, whereupon they're not readable by other sessions.
The only practical fix I can see is to give up on what
bf7ca1587
tried to do, and say that the column names of tuples produced by
a whole-row Var are always those of the underlying named composite
type, query aliases or no. While this introduces some inconsistencies,
it removes others, so it's not that awful in the abstract. What *is*
kind of awful is to make such a behavioral change in a back-patched
bug fix. But corrupt data is worse, so back-patched it will be.
(A workaround available to anyone who's unhappy about this is to
introduce an extra level of sub-SELECT, so that the whole-row Var is
referring to the sub-SELECT's output and not to a named table type.
Then the Var is of type RECORD to begin with and there's no issue.)
Per report from Miles Delahunty. The faulty commit dates to 9.5,
so back-patch to all supported branches.
Discussion: https://postgr.es/m/
2950001.
1638729947@sss.pgh.pa.us
Tomas Vondra [Wed, 16 Mar 2022 15:42:47 +0000 (16:42 +0100)]
Fix publish_as_relid with multiple publications
Commit
83fd4532a7 allowed publishing of changes via ancestors, for
publications defined with publish_via_partition_root. But the way
the ancestor was determined in get_rel_sync_entry() was incorrect,
simply updating the same variable. So with multiple publications,
replicating different ancestors, the outcome depended on the order
of publications in the list - the value from the last loop was used,
even if it wasn't the top-most ancestor.
This is a probably rare situation, as in most cases publications do
not overlap, so each partition has exactly one candidate ancestor
to replicate as and there's no ambiguity.
Fixed by tracking the "ancestor level" for each publication, and
picking the top-most ancestor. Adds a test case, verifying the
correct ancestor is used for publishing the changes and that this
does not depend on order of publications in the list.
Older releases have another bug in this loop - once all actions are
replicated, the loop is terminated, on the assumption that inspecting
additional publications is unecessary. But that misses the fact that
those additional applications may replicate different ancestors.
Fixed by removal of this break condition. We might still terminate the
loop in some cases (e.g. when replicating all actions and the ancestor
is the partition root).
Backpatch to 13, where publish_via_partition_root was introduced.
Initial report and fix by me, test added by Hou zj. Reviews and
improvements by Amit Kapila.
Author: Tomas Vondra, Hou zj, Amit Kapila
Reviewed-by: Amit Kapila, Hou zj
Discussion: https://postgr.es/m/
d26d24dd-2fab-3c48-0162-
2b7f84a9c893%40enterprisedb.com
Alexander Korotkov [Wed, 16 Mar 2022 08:41:18 +0000 (11:41 +0300)]
Fix default signature length for gist_ltree_ops
911e702077 implemented operator class parameters including the signature length
in ltree. Previously, the signature length for gist_ltree_ops was 8. Because
of bug
911e702077 the default signature length for gist_ltree_ops became 28 for
ltree 1.1 (where options method is NOT provided) and 8 for ltree 1.2 (where
options method is provided). This commit changes the default signature length
for ltree 1.1 to 8.
Existing gist_ltree_ops indexes might be corrupted in various scenarios.
Thus, we have to recommend reindexing all the gist_ltree_ops indexes after
the upgrade.
Reported-by: Victor Yegorov
Reviewed-by: Tomas Vondra, Tom Lane, Andres Freund, Nikita Glukhov
Reviewed-by: Andrew Dunstan
Author: Tomas Vondra, Alexander Korotkov
Discussion: https://postgr.es/m/17406-
71e02820ae79bb40%40postgresql.org
Discussion: https://postgr.es/m/
d80e0a55-6c3e-5b26-53e3-
3c4f973f737c%40enterprisedb.com
Thomas Munro [Wed, 16 Mar 2022 04:20:24 +0000 (17:20 +1300)]
Fix race between DROP TABLESPACE and checkpointing.
Commands like ALTER TABLE SET TABLESPACE may leave files for the next
checkpoint to clean up. If such files are not removed by the time DROP
TABLESPACE is called, we request a checkpoint so that they are deleted.
However, there is presently a window before checkpoint start where new
unlink requests won't be scheduled until the following checkpoint. This
means that the checkpoint forced by DROP TABLESPACE might not remove the
files we expect it to remove, and the following ERROR will be emitted:
ERROR: tablespace "mytblspc" is not empty
To fix, add a call to AbsorbSyncRequests() just before advancing the
unlink cycle counter. This ensures that any unlink requests forwarded
prior to checkpoint start (i.e., when ckpt_started is incremented) will
be processed by the current checkpoint. Since AbsorbSyncRequests()
performs memory allocations, it cannot be called within a critical
section, so we also need to move SyncPreCheckpoint() to before
CreateCheckPoint()'s critical section.
This is an old bug, so back-patch to all supported versions.
Author: Nathan Bossart
Reported-by: Nathan Bossart
Reviewed-by: Thomas Munro
Reviewed-by: Andres Freund
Discussion: https://postgr.es/m/20220215235845.GA2665318%40nathanxps13
Michael Paquier [Wed, 16 Mar 2022 03:29:55 +0000 (12:29 +0900)]
pageinspect: Fix memory context allocation of page in brin_revmap_data()
This caused the function to fail, as the aligned copy of the raw page
given by the function caller was not saved in the correct memory
context, which needs to be multi_call_memory_ctx in this case.
Issue introduced by
076f4d9.
Per buildfarm members sifika, mylodon and longfin. I have reproduced
that locally with macos.
Discussion: https://postgr.es/m/
[email protected]
Backpatch-through: 10
Thomas Munro [Wed, 16 Mar 2022 02:37:15 +0000 (15:37 +1300)]
Fix waiting in RegisterSyncRequest().
If we run out of space in the checkpointer sync request queue (which is
hopefully rare on real systems, but common with very small buffer pool),
we wait for it to drain. While waiting, we should report that as a wait
event so that users know what is going on, and also handle postmaster
death, since otherwise the loop might never terminate if the
checkpointer has exited.
Back-patch to 12. Although the problem exists in earlier releases too,
the code is structured differently before 12 so I haven't gone any
further for now, in the absence of field complaints.
Reported-by: Andres Freund
Reviewed-by: Andres Freund
Discussion: https://postgr.es/m/
20220226213942.nb7uvb2pamyu26dj%40alap3.anarazel.de
Michael Paquier [Wed, 16 Mar 2022 02:20:51 +0000 (11:20 +0900)]
pageinspect: Fix handling of page sizes and AM types
This commit fixes a set of issues related to the use of the SQL
functions in this module when the caller is able to pass down raw page
data as input argument:
- The page size check was fuzzy in a couple of places, sometimes
looking after only a sub-range, but what we are looking for is an exact
match on BLCKSZ. After considering a few options here, I have settled
down to do a generalization of get_page_from_raw(). Most of the SQL
functions already used that, and this is not strictly required if not
accessing an 8-byte-wide value from a raw page, but this feels safer in
the long run for alignment-picky environment, particularly if a code
path begins to access such values. This also reduces the number of
strings that need to be translated.
- The BRIN function brin_page_items() uses a Relation but it did not
check the access method of the opened index, potentially leading to
crashes. All the other functions in need of a Relation already did
that.
- Some code paths could fail on elog(), but we should to use ereport()
for failures that can be triggered by the user.
Tests are added to stress all the cases that are fixed as of this
commit, with some junk raw pages (\set VERBOSITY ensures that this works
across all page sizes) and unexpected index types when functions open
relations.
Author: Michael Paquier, Justin Prysby
Discussion: https://postgr.es/m/
20220218030020[email protected]
Backpatch-through: 10
Thomas Munro [Tue, 15 Mar 2022 22:35:00 +0000 (11:35 +1300)]
Back-patch LLVM 14 API changes.
Since LLVM 14 has stopped changing and is about to be released,
back-patch the following changes from the master branch:
e6a7600202105919bffd62b3dfd941f4a94e082b
807fee1a39de6bb8184082012e643951abb9ad1d
a56e7b66010f330782243de9e25ac2a6596be0e1
Back-patch to 11, where LLVM JIT support came in.
Michael Paquier [Wed, 9 Mar 2022 05:59:22 +0000 (14:59 +0900)]
doc: Add ALTER/DROP ROUTINE to the event trigger matrix
ALTER ROUTINE triggers the events ddl_command_start and ddl_command_end,
and DROP ROUTINE triggers sql_drop, ddl_command_start and
ddl_command_end, but this was not mention on the matrix table.
Reported-by: Leslie Lemaire
Discussion: https://postgr.es/m/
164647533363.646.
5802968483136493025@wrigleys.postgresql.org
Backpatch-through: 11
Noah Misch [Sat, 5 Mar 2022 02:53:13 +0000 (18:53 -0800)]
Introduce PG_TEST_TIMEOUT_DEFAULT for TAP suite non-elapsing timeouts.
Slow hosts may avoid load-induced, spurious failures by setting
environment variable PG_TEST_TIMEOUT_DEFAULT to some number of seconds
greater than 180. Developers may see faster failures by setting that
environment variable to some lesser number of seconds. In tests, write
$PostgreSQL::Test::Utils::timeout_default wherever the convention has
been to write 180. This change raises the default for some briefer
timeouts. Back-patch to v10 (all supported versions).
Discussion: https://postgr.es/m/
20220218052842[email protected]
Tom Lane [Fri, 4 Mar 2022 18:23:58 +0000 (13:23 -0500)]
Fix pg_regress to print the correct postmaster address on Windows.
pg_regress reported "Unix socket" as the default location whenever
HAVE_UNIX_SOCKETS is defined. However, that's not been accurate
on Windows since
8f3ec75de. Update this logic to match what libpq
actually does now.
This is just cosmetic, but still it's potentially misleading.
Back-patch to v13 where
8f3ec75de came in.
Discussion: https://postgr.es/m/
3894060.
1646415641@sss.pgh.pa.us
Tom Lane [Fri, 4 Mar 2022 00:03:17 +0000 (19:03 -0500)]
Fix bogus casting in BlockIdGetBlockNumber().
This macro cast the result to BlockNumber after shifting, not before,
which is the wrong thing. Per the C spec, the uint16 fields would
promote to int not unsigned int, so that (for 32-bit int) the shift
potentially shifts a nonzero bit into the sign position. I doubt
there are any production systems where this would actually end with
the wrong answer, but it is undefined behavior per the C spec, and
clang's -fsanitize=undefined option reputedly warns about it on some
platforms. (I can't reproduce that right now, but the code is
undeniably wrong per spec.) It's easy to fix by casting to
BlockNumber (uint32) in the proper places.
It's been wrong for ages, so back-patch to all supported branches.
Report and patch by Zhihong Yu (cosmetic tweaking by me)
Discussion: https://postgr.es/m/CALNJ-vT9r0DSsAOw9OXVJFxLENoVS_68kJ5x0p44atoYH+H4dg@mail.gmail.com
Tom Lane [Thu, 3 Mar 2022 23:13:24 +0000 (18:13 -0500)]
Clean up assorted failures under clang's -fsanitize=undefined checks.
Most of these are cases where we could call memcpy() or other libc
functions with a NULL pointer and a zero count, which is forbidden
by POSIX even though every production version of libc allows it.
We've fixed such things before in a piecemeal way, but apparently
never made an effort to try to get them all. I don't claim that
this patch does so either, but it gets every failure I observe in
check-world, using clang 12.0.1 on current RHEL8.
numeric.c has a different issue that the sanitizer doesn't like:
"ln(-1.0)" will compute log10(0) and then try to assign the
resulting -Inf to an integer variable. We don't actually use the
result in such a case, so there's no live bug.
Back-patch to all supported branches, with the idea that we might
start running a buildfarm member that tests this case. This includes
back-patching
c1132aae3 (Check the size in COPY_POINTER_FIELD),
which previously silenced some of these issues in copyfuncs.c.
Discussion: https://postgr.es/m/CALNJ-vT9r0DSsAOw9OXVJFxLENoVS_68kJ5x0p44atoYH+H4dg@mail.gmail.com
Tom Lane [Wed, 2 Mar 2022 16:57:02 +0000 (11:57 -0500)]
Allow root-owned SSL private keys in libpq, not only the backend.
This change makes libpq apply the same private-key-file ownership
and permissions checks that we have used in the backend since commit
9a83564c5. Namely, that the private key can be owned by either the
current user or root (with different file permissions allowed in the
two cases). This allows system-wide management of key files, which
is just as sensible on the client side as the server, particularly
when the client is itself some application daemon.
Sync the comments about this between libpq and the backend, too.
Back-patch of
a59c79564 and
50f03473e into all supported branches.
David Steele
Discussion: https://postgr.es/m/
f4b7bc55-97ac-9e69-7398-
335e212f7743@pgmasters.net
Tom Lane [Fri, 25 Feb 2022 22:40:21 +0000 (17:40 -0500)]
Disallow execution of SPI functions during plperl function compilation.
Perl can be convinced to execute user-defined code during compilation
of a plperl function (or at least a plperlu function). That's not
such a big problem as long as the activity is confined within the
Perl interpreter, and it's not clear we could do anything about that
anyway. However, if such code tries to use plperl's SPI functions,
we have a bigger problem. In the first place, those functions are
likely to crash because current_call_data->prodesc isn't set up yet.
In the second place, because it isn't set up, we lack critical info
such as whether the function is supposed to be read-only. And in
the third place, this path allows code execution during function
validation, which is strongly discouraged because of the potential
for security exploits. Hence, reject execution of the SPI functions
until compilation is finished.
While here, add check_spi_usage_allowed() calls to various functions
that hadn't gotten the memo about checking that. I think that perhaps
plperl_sv_to_literal may have been intentionally omitted on the grounds
that it was safe at the time; but if so, the addition of transforms
functionality changed that. The others are more recently added and
seem to be flat-out oversights.
Per report from Mark Murawski. Back-patch to all supported branches.
Discussion: https://postgr.es/m/
9acdf918-7fff-4f40-f750-
2ffa84f083d2@intellasoft.net
Andres Freund [Fri, 25 Feb 2022 18:30:05 +0000 (10:30 -0800)]
pg_waldump: Fix error message for WAL files smaller than XLOG_BLCKSZ.
When opening a WAL file smaller than XLOG_BLCKSZ (e.g. 0 bytes long) while
determining the wal_segment_size, pg_waldump checked errno, despite errno not
being set by the short read. Resulting in a bogus error message.
Author: Kyotaro Horiguchi
Discussion: https://postgr.es/m/20220214.181847.775024684568733277[email protected]
Backpatch: 11-, the bug was introducedin fc49e24fa
Andres Freund [Sat, 19 Feb 2022 20:27:20 +0000 (12:27 -0800)]
Fix temporary object cleanup failing due to toast access without snapshot.
When cleaning up temporary objects during process exit the cleanup could fail
with:
FATAL: cannot fetch toast data without an active snapshot
The bug is caused by RemoveTempRelationsCallback() not setting up a
snapshot. If an object with toasted catalog data needs to be cleaned up,
init_toast_snapshot() could fail with the above error.
Most of the time however the the problem is masked due to cached catalog
snapshots being returned by GetOldestSnapshot(). But dropping an object can
cause catalog invalidations to be emitted. If no further catalog accesses are
necessary between the invalidation processing and the next toast datum
deletion, the bug becomes visible.
It's easy to miss this bug because it typically happens after clients
disconnect and the FATAL error just ends up in the log.
Luckily temporary table cleanup at the next use of the same temporary schema
or during DISCARD ALL does not have the same problem.
Fix the bug by pushing a snapshot in RemoveTempRelationsCallback(). Also add
isolation tests for temporary object cleanup, including objects with toasted
catalog data.
A future HEAD only commit will add more assertions.
Reported-By: Miles Delahunty
Author: Andres Freund
Discussion: https://postgr.es/m/CAOFAq3BU5Mf2TTvu8D9n_ZOoFAeQswuzk7yziAb7xuw_qyw5gw@mail.gmail.com
Backpatch: 10-
Andrew Dunstan [Sun, 20 Feb 2022 16:49:33 +0000 (11:49 -0500)]
Remove most msys special processing in TAP tests
Following migration of Windows buildfarm members running TAP tests to
use of ucrt64 perl for those tests, special processing for msys perl is
no longer necessary and so is removed.
Backpatch to release 10
Discussion: https://postgr.es/m/
c65a8781-77ac-ea95-d185-
6db291e1baeb@dunslane.net
Andrew Dunstan [Sun, 20 Feb 2022 13:55:06 +0000 (08:55 -0500)]
Remove PostgreSQL::Test::Utils::perl2host completely
Commit
f1ac4a74de disabled this processing, and as nothing has broken (as
expected) here we proceed to remove the routine and adjust all the call
sites.
Backpatch to release 10
Discussion: https://postgr.es/m/
0ba775a2-8aa0-0d56-d780-
69427cf6f33d@dunslane.net
Discussion: https://postgr.es/m/
20220125023609[email protected]
Tom Lane [Fri, 18 Feb 2022 03:45:34 +0000 (22:45 -0500)]
Suppress warning about stack_base_ptr with late-model GCC.
GCC 12 complains that set_stack_base is storing the address of
a local variable in a long-lived pointer. This is an entirely
reasonable warning (indeed, it just helped us find a bug);
but that behavior is intentional here. We can work around it
by using __builtin_frame_address(0) instead of a specific local
variable; that produces an address a dozen or so bytes different,
in my testing, but we don't care about such a small difference.
Maybe someday a compiler lacking that function will start to issue
a similar warning, but we'll worry about that when it happens.
Patch by me, per a suggestion from Andres Freund. Back-patch to
v12, which is as far back as the patch will go without some pain.
(Recently-established project policy would permit a back-patch as
far as 9.2, but I'm disinclined to expend the work until GCC 12
is much more widespread.)
Discussion: https://postgr.es/m/
3773792.
1645141467@sss.pgh.pa.us
Etsuro Fujita [Wed, 16 Feb 2022 06:15:04 +0000 (15:15 +0900)]
Doc: Update documentation for modifying postgres_fdw foreign tables.
Document that they can be modified using COPY as well.
Back-patch to v11 where commit
3d956d956 added support for COPY in
postgres_fdw.
Amit Kapila [Mon, 14 Feb 2022 02:54:44 +0000 (08:24 +0530)]
WAL log unchanged toasted replica identity key attributes.
Currently, during UPDATE, the unchanged replica identity key attributes
are not logged separately because they are getting logged as part of the
new tuple. But if they are stored externally then the untoasted values are
not getting logged as part of the new tuple and logical replication won't
be able to replicate such UPDATEs. So we need to log such attributes as
part of the old_key_tuple during UPDATE.
Reported-by: Haiying Tang
Author: Dilip Kumar and Amit Kapila
Reviewed-by: Alvaro Herrera, Haiying Tang, Andres Freund
Backpatch-through: 10
Discussion: https://postgr.es/m/OS0PR01MB611342D0A92D4F4BF26C0F47FB229@OS0PR01MB6113.jpnprd01.prod.outlook.com
Alexander Korotkov [Mon, 14 Feb 2022 00:26:55 +0000 (03:26 +0300)]
Fix memory leak in IndexScan node with reordering
Fix ExecReScanIndexScan() to free the referenced tuples while emptying the
priority queue. Backpatch to all supported versions.
Discussion: https://postgr.es/m/CAHqSB9gECMENBQmpbv5rvmT3HTaORmMK3Ukg73DsX5H7EJV7jw%40mail.gmail.com
Author: Aliaksandr Kalenik
Reviewed-by: Tom Lane, Alexander Korotkov
Backpatch-through: 10
Tom Lane [Sat, 12 Feb 2022 18:23:20 +0000 (13:23 -0500)]
Fix thinko in PQisBusy().
In commit
1f39a1c06 I made PQisBusy consider conn->write_failed, but
that is now looking like complete brain fade. In the first place, the
logic is quite wrong: it ought to be like "and not" rather than "or".
This meant that once we'd gotten into a write_failed state, PQisBusy
would always return true, probably causing the calling application to
iterate its loop until PQconsumeInput returns a hard failure thanks
to connection loss. That's not what we want: the intended behavior
is to return an error PGresult, which the application probably has
much cleaner support for.
But in the second place, checking write_failed here seems like the
wrong thing anyway. The idea of the write_failed mechanism is to
postpone handling of a write failure until we've read all we can from
the server; so that flag should not interfere with input-processing
behavior. (Compare
7247e243a.) What we *should* check for is
status = CONNECTION_BAD, ie, socket already closed. (Most places that
close the socket don't touch asyncStatus, but they do reset status.)
This primarily ensures that if PQisBusy() returns true then there is
an open socket, which is assumed by several call sites in our own
code, and probably other applications too.
While at it, fix a nearby thinko in libpq's my_sock_write: we should
only consult errno for res < 0, not res == 0. This is harmless since
pqsecure_raw_write would force errno to zero in such a case, but it
still could confuse readers.
Noted by Andres Freund. Backpatch to v12 where
1f39a1c06 came in.
Discussion: https://postgr.es/m/
20220211011025[email protected]
Tom Lane [Fri, 11 Feb 2022 20:23:52 +0000 (15:23 -0500)]
Don't use_physical_tlist for an IOS with non-returnable columns.
createplan.c tries to save a runtime projection step by specifying
a scan plan node's output as being exactly the table's columns, or
index's columns in the case of an index-only scan, if there is not a
reason to do otherwise. This logic did not previously pay attention
to whether an index's columns are returnable. That worked, sort of
accidentally, until commit
9a3ddeb51 taught setrefs.c to reject plans
that try to read a non-returnable column. I have no desire to loosen
setrefs.c's new check, so instead adjust use_physical_tlist() to not
try to optimize this way when there are non-returnable column(s).
Per report from Ryan Kelly. Like the previous patch, back-patch
to all supported branches.
Discussion: https://postgr.es/m/CAHUie24ddN+pDNw7fkhNrjrwAX=fXXfGZZEHhRuofV_N_ftaSg@mail.gmail.com
Tom Lane [Thu, 10 Feb 2022 21:49:39 +0000 (16:49 -0500)]
Make pg_ctl stop/restart/promote recheck postmaster aliveness.
"pg_ctl stop/restart" checked that the postmaster PID is valid just
once, as a side-effect of sending the stop signal, and then would
wait-till-timeout for the postmaster.pid file to go away. This
neglects the case wherein the postmaster dies uncleanly after we
signal it. Similarly, once "pg_ctl promote" has sent the signal,
it'd wait for the corresponding on-disk state change to occur
even if the postmaster dies.
I'm not sure how we've managed not to notice this problem, but it
seems to explain slow execution of the 017_shm.pl test script on AIX
since commit
4fdbf9af5, which added a speculative "pg_ctl stop" with
the idea of making real sure that the postmaster isn't there. In the
test steps that kill-9 and then restart the postmaster, it's possible
to get past the initial signal attempt before kill() stops working
for the doomed postmaster. If that happens, pg_ctl waited till
PGCTLTIMEOUT before giving up ... and the buildfarm's AIX members
have that set very high.
To fix, include a "kill(pid, 0)" test (similar to what
postmaster_is_alive uses) in these wait loops, so that we'll
give up immediately if the postmaster PID disappears.
While here, I chose to refactor those loops out of where they were.
do_stop() and do_restart() can perfectly well share one copy of the
wait-for-stop loop, and it seems desirable to put a similar function
beside that for wait-for-promote.
Back-patch to all supported versions, since pg_ctl's wait logic
is substantially identical in all, and we're seeing the slow test
behavior in all branches.
Discussion: https://postgr.es/m/
20220210023537[email protected]
Andrew Dunstan [Thu, 10 Feb 2022 18:44:05 +0000 (13:44 -0500)]
Use gendef instead of pexports for building windows .def files
Modern msys systems lack pexports but have gendef instead, so use that.
Discussion: https://postgr.es/m/
3ccde7a9-e4f9-e194-30e0-
0936e6ad68ba@dunslane.net
Backpatch to release 9.4 to enable building with perl on older branches.
Before that pexports is not used for plperl.
Noah Misch [Thu, 10 Feb 2022 02:16:59 +0000 (18:16 -0800)]
Use Test::Builder::todo_start(), replacing $::TODO.
Some pre-2017 Test::More versions need perfect $Test::Builder::Level
maintenance to find the variable. Buildfarm member snapper reported an
overall failure that the file intended to hide via the TODO construct.
That trouble was reachable in v11 and v10. For later branches, this
serves as defense in depth. Back-patch to v10 (all supported versions).
Discussion: https://postgr.es/m/
20220202055556[email protected]
Noah Misch [Thu, 10 Feb 2022 02:16:56 +0000 (18:16 -0800)]
Fix back-patch of "Avoid race in RelationBuildDesc() ..."
The back-patch of commit
fdd965d074d46765c295223b119ca437dbcac973 broke
CLOBBER_CACHE_ALWAYS for v9.6 through v13. It updated the
InvalidateSystemCaches() call for CLOBBER_CACHE_RECURSIVELY, neglecting
the one for CLOBBER_CACHE_ALWAYS. Back-patch to v13, v12, v11, and v10.
Reviewed by Tomas Vondra. Reported by Tomas Vondra.
Discussion: https://postgr.es/m/
df7b4c0b-7d92-f03f-75c4-
9e08b269a716@enterprisedb.com
Tom Lane [Wed, 9 Feb 2022 00:25:56 +0000 (19:25 -0500)]
Remove ppport.h's broken re-implementation of eval_pv().
Recent versions of Devel::PPPort try to redefine eval_pv() to
dodge a bug in pre-5.31 Perl versions. Unfortunately the redefinition
fails on compilers that don't support statements nested within
expressions. However, we aren't actually interested in this bug fix,
since we always call eval_pv() with croak_on_error = FALSE.
So, until there's an upstream fix for this breakage, just comment
out the macro to revert to the older behavior.
Per report from Wei Sun, as well as previous buildfarm failure
on pademelon (which I'd unfortunately not looked at carefully
enough to understand the cause). Back-patch to all supported
versions, since we're using the same ppport.h in all.
Discussion: https://postgr.es/m/
[email protected]
Report: https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=pademelon&dt=2022-02-02%2001%3A22%3A58
Tom Lane [Mon, 7 Feb 2022 21:17:41 +0000 (16:17 -0500)]
Stamp 13.6.
Peter Eisentraut [Mon, 7 Feb 2022 12:36:22 +0000 (13:36 +0100)]
Translation updates
Source-Git-URL: git://git.postgresql.org/git/pgtranslation/messages.git
Source-Git-Hash:
9aa8bc576f9af5c61de4a6fc8119abfa36493d01
Tom Lane [Sun, 6 Feb 2022 19:24:55 +0000 (14:24 -0500)]
Release notes for 14.2, 13.6, 12.10, 11.15, 10.20.
Tom Lane [Sat, 5 Feb 2022 17:55:44 +0000 (12:55 -0500)]
Doc: be clearer that foreign-table partitions need user-added constraints.
A very well-informed user might deduce this from what we said already,
but I'd bet against it. Lay it out explicitly.
While here, rewrite the comment about tuple routing to be more
intelligible to an average SQL user.
Per bug #17395 from Alexander Lakhin. Back-patch to v11. (The text
in this area is different in v10 and I'm not sufficiently excited
about this point to adapt the patch.)
Discussion: https://postgr.es/m/17395-
8c326292078d1a57@postgresql.org
Tom Lane [Sat, 5 Feb 2022 16:59:30 +0000 (11:59 -0500)]
Test, don't just Assert, that mergejoin's inputs are in order.
There are two Asserts in nodeMergejoin.c that are reachable if
the input data is not in the expected order. This seems way too
fragile. Alexander Lakhin reported a case where the assertions
could be triggered with misconfigured foreign-table partitions,
and bitter experience with unstable operating system collation
definitions suggests another easy route to hitting them. Neither
Assert is in a place where we can't afford one more test-and-branch,
so replace 'em with plain test-and-elog logic.
Per bug #17395. While the reported symptom is relatively recent,
collation changes could happen anytime, so back-patch to all
supported branches.
Discussion: https://postgr.es/m/17395-
8c326292078d1a57@postgresql.org
Bruce Momjian [Thu, 3 Feb 2022 02:53:51 +0000 (21:53 -0500)]
doc: clarify syntax notation, particularly parentheses
Also move TCL syntax to the PL/tcl section.
Reported-by: [email protected]
Discussion: https://postgr.es/m/
164308146320.12460.
3590769444508751574@wrigleys.postgresql.org
Backpatch-through: 10
Peter Eisentraut [Wed, 2 Feb 2022 08:14:26 +0000 (09:14 +0100)]
doc: Fix mistake in PL/Python documentation
Small thinko introduced by
94aceed317730953476bec490ce0148b2af3c383
Reported-by: [email protected]
Tom Lane [Wed, 2 Feb 2022 00:03:41 +0000 (19:03 -0500)]
Replace use of deprecated Python module distutils.sysconfig, take 2.
With Python 3.10, configure spits out warnings about the module
distutils.sysconfig being deprecated and scheduled for removal in
Python 3.12. Change the uses in configure to use the module sysconfig
instead. The logic stays largely the same, although we have to
rely on INCLUDEPY instead of the deprecated get_python_inc function.
Note that sysconfig exists since Python 2.7, so this moves the
minimum required version up from Python 2.6 (or 2.4, before v13).
Also, sysconfig didn't exist in Python 3.1, so the minimum 3.x
version is now 3.2.
Back-patch of commit
bd233bdd8 into all supported branches.
In v10, this also includes back-patching v11's
beff4bb9c, primarily
because this opinion is clearly out-of-date:
While at it, get rid of the code's assumption that both the major and
minor numbers contain exactly one digit. That will foreseeably be
broken by Python 3.10 in perhaps four or five years. That's far enough
out that we probably don't need to back-patch this.
Peter Eisentraut, Tom Lane, Andres Freund
Discussion: https://postgr.es/m/
c74add3c-09c4-a9dd-1a03-
a846e5b2fc52@enterprisedb.com
Tom Lane [Mon, 31 Jan 2022 20:07:39 +0000 (15:07 -0500)]
Revert "plperl: Fix breakage of
c89f409749c in back branches."
This reverts commits
d81cac47a et al. We shouldn't need that
hack after the preceding commits.
Discussion: https://postgr.es/m/
20220131015130[email protected]
Tom Lane [Mon, 31 Jan 2022 20:01:05 +0000 (15:01 -0500)]
plperl: update ppport.h to Perl 5.34.0.
Also apply the changes suggested by running
perl ppport.h --compat-version=5.8.0
And remove some no-longer-required NEED_foo declarations.
Dagfinn Ilmari Mannsåker
Back-patch of commit
05798c9f7 into all supported branches.
At the time we thought this update was mostly cosmetic, but the
lack of it has caused trouble, while the patch itself hasn't.
Discussion: https://postgr.es/m/
[email protected]
Discussion: https://postgr.es/m/
20220131015130[email protected]
Andres Freund [Mon, 31 Jan 2022 01:53:53 +0000 (17:53 -0800)]
plperl: Fix breakage of
c89f409749c in back branches.
ppport.h was only updated in
05798c9f7f0 (master). Unfortunately my commit
c89f409749c uses PERL_VERSION_LT which came in with that update. Breaking most
buildfarm animals.
I should have noticed that...
We might want to backpatch the ppport update instead, but for now lets get the
buildfarm green again.
Discussion: https://postgr.es/m/
20220131015130[email protected]
Backpatch: 10-14, master doesn't need it
Andres Freund [Sun, 30 Jan 2022 22:29:04 +0000 (14:29 -0800)]
plperl: windows: Use Perl_setlocale on 5.28+, fixing compile failure.
For older versions we need our own copy of perl's setlocale(), because it was
not exposed (why we need the setlocale in the first place is explained in
plperl_init_interp) . The copy stopped working in 5.28, as some of the used
macros are not public anymore. But Perl_setlocale is available in 5.28, so
use that.
Author: Victor Wagner
Reviewed-By: Dagfinn Ilmari Mannsåker
Discussion: https://postgr.es/m/20200501134711.08750c5f@antares.wagner.home
Backpatch: all versions
Tom Lane [Sat, 29 Jan 2022 16:41:12 +0000 (11:41 -0500)]
Fix failure to validate the result of select_common_type().
Although select_common_type() has a failure-return convention, an
apparent successful return just provides a type OID that *might* work
as a common supertype; we've not validated that the required casts
actually exist. In the mainstream use-cases that doesn't matter,
because we'll proceed to invoke coerce_to_common_type() on each input,
which will fail appropriately if the proposed common type doesn't
actually work. However, a few callers didn't read the (nonexistent)
fine print, and thought that if they got back a nonzero OID then the
coercions were sure to work.
This affects in particular the recently-added "anycompatible"
polymorphic types; we might think that a function/operator using
such types matches cases it really doesn't. A likely end result
of that is unexpected "ambiguous operator" errors, as for example
in bug #17387 from James Inform. Another, much older, case is that
the parser might try to transform an "x IN (list)" construct to
a ScalarArrayOpExpr even when the list elements don't actually have
a common supertype.
It doesn't seem desirable to add more checking to select_common_type
itself, as that'd just slow down the mainstream use-cases. Instead,
write a separate function verify_common_type that performs the
missing checks, and add a call to that where necessary. Likewise add
verify_common_type_from_oids to go with select_common_type_from_oids.
Back-patch to v13 where the "anycompatible" types came in. (The
symptom complained of in bug #17387 doesn't appear till v14, but
that's just because we didn't get around to converting || to use
anycompatible till then.) In principle the "x IN (list)" fix could
go back all the way, but I'm not currently convinced that it makes
much difference in real-world cases, so I won't bother for now.
Discussion: https://postgr.es/m/17387-
5dfe54b988444963@postgresql.org
Tomas Vondra [Thu, 27 Jan 2022 16:53:53 +0000 (17:53 +0100)]
Fix ordering of XIDs in ProcArrayApplyRecoveryInfo
Commit
8431e296ea reworked ProcArrayApplyRecoveryInfo to sort XIDs
before adding them to KnownAssignedXids. But the XIDs are sorted using
xidComparator, which compares the XIDs simply as uint32 values, not
logically. KnownAssignedXidsAdd() however expects XIDs in logical order,
and calls TransactionIdFollowsOrEquals() to enforce that. If there are
XIDs for which the two orderings disagree, an error is raised and the
recovery fails/restarts.
Hitting this issue is fairly easy - you just need two transactions, one
started before the 4B limit (e.g. XID
4294967290), the other sometime
after it (e.g. XID 1000). Logically (
4294967290 <= 1000) but when
compared using xidComparator we try to add them in the opposite order.
Which makes KnownAssignedXidsAdd() fail with an error like this:
ERROR: out-of-order XID insertion in KnownAssignedXids
This only happens during replica startup, while processing RUNNING_XACTS
records to build the snapshot. Once we reach STANDBY_SNAPSHOT_READY, we
skip these records. So this does not affect already running replicas,
but if you restart (or create) a replica while there are transactions
with XIDs for which the two orderings disagree, you may hit this.
Long-running transactions and frequent replica restarts increase the
likelihood of hitting this issue. Once the replica gets into this state,
it can't be started (even if the old transactions are terminated).
Fixed by sorting the XIDs logically - this is fine because we're dealing
with normal XIDs (because it's XIDs assigned to backends) and from the
same wraparound epoch (otherwise the backends could not be running at
the same time on the primary node). So there are no problems with the
triangle inequality, which is why xidComparator compares raw values.
Investigation and root cause analysis by Abhijit Menon-Sen. Patch by me.
This issue is present in all releases since 9.4, however releases up to
9.6 are EOL already so backpatch to 10 only.
Reviewed-by: Abhijit Menon-Sen
Reviewed-by: Alvaro Herrera
Backpatch-through: 10
Discussion: https://postgr.es/m/
36b8a501-5d73-277c-4972-
f58a4dce088a%40enterprisedb.com