Commit 2fd8685e7f simplified the checking of modified attributes that
takes place within heap_update(). This included a micro-optimization
affecting pages marked PD_PAGE_FULL: don't even try to use HOT to save a
few cycles on determining HOT safety. The assumption was that it won't
work out this time around, since it can't have worked out last time
around.
Remove the micro-optimization. It could only ever save cycles that are
consumed by the vast majority of heap_update() calls, which hardly seems
worth the added complexity. It also seems quite possible that there are
workloads that will do worse over time by repeated application of the
micro-optimization, despite saving some cycles on average, in the short
term.
Author: Peter Geoghegan <pg@bowt.ie>
Reviewed-By: Álvaro Herrera <alvherre@alvh.no-ip.org>
Discussion: https://postgr.es/m/CAH2-WznU1L3+DMPr1F7o2eJBT7=3bAJoY6ZkWABAxNt+-afyTA@mail.gmail.com
In commit ff9f111bce I mixed up inconsistent definitions of the LSN of
the first record in a page, when the previous record ends exactly at the
page boundary. The correct LSN is adjusted to skip the WAL page header;
I failed to use that when setting XLogReaderState->overwrittenRecPtr,
so at WAL replay time VerifyOverwriteContrecord would refuse to let
replay continue past that record.
Backpatch to 10. 9.6 also contains this bug, but it's no longer being
maintained.
Discussion: https://postgr.es/m/45597.1637694259@sss.pgh.pa.us
Commit 6aaaa76bb added support for the GRANTED BY clause in GRANT and
REVOKE statements, but missed adding support for checking the role in
the REVOKE ROLE case. Fix by checking that the parsed role matches the
CURRENT_ROLE/CURRENT_USER requirement, and also add some tests for it.
Backpatch to v14 where GRANTED BY support was introduced.
Discussion: https://postgr.es/m/B7F6699A-A984-4943-B9BF-CEB84C003527@yesql.se
Backpatch-through: 14
Various places wanted to point out that tuple descriptors don't
contain the variable-length fields of pg_attribute. This started when
attacl was added, but more fields have been added since, and these
comments haven't been kept up to date consistently. Reword so that
the purpose is clearer and we don't have to keep updating them.
Replica identities that depend directly on an index rely on a set of
properties, one of them being that all the columns defined in this index
have to be marked as NOT NULL. There was a hole in the logic with ALTER
TABLE DROP NOT NULL, where it was possible to remove the NOT NULL
property of a column part of an index used as replica identity, so block
it to avoid problems with logical decoding down the road.
The same check was already done columns part of a primary key, so the
fix is straight-forward.
Author: Haiying Tang, Hou Zhijie
Reviewed-by: Dilip Kumar, Michael Paquier
Discussion: https://postgr.es/m/OS0PR01MB6113338C102BEE8B2FFC5BD9FB619@OS0PR01MB6113.jpnprd01.prod.outlook.com
Backpatch-through: 10
In most places, the variables necessarily store the same value as the
eponymous members of the XLogReaderState that we use during WAL
replay, because ReadRecord() assigns the values from the structure
members to the global variables just after XLogReadRecord() returns.
However, XLogBeginRead() adjusts the structure members but not the
global variables, so after XLogBeginRead() and before the completion
of XLogReadRecord() the values can differ. Otherwise, they must be
identical. According to my analysis, the only place where either
variable is referenced at a point where it might not have the same
value as the structure member is the refrence to EndRecPtr within
XLogPageRead.
Therefore, at every other place where we are using the global
variable, we can just switch to using the structure member instead,
and remove the global variable. However, we can, and in fact should,
do this in XLogPageRead() as well, because at that point in the code,
the global variable will actually store the start of the record we
want to read - either because it's where the last WAL record ended, or
because the read position has been changed using XLogBeginRead since
the last record was read. The structure member, on the other hand,
will already have been updated to point to the end of the record we
just read. Elsewhere, the latter is what we use as an argument to
emode_for_corrupt_record(), so we should do the same here.
This part of the patch is perhaps a bug fix, but I don't think it has
any important consequences, so no back-patch. The point here is just
to continue to whittle down the entirely excessive use of global
variables in xlog.c.
Discussion: http://postgr.es/m/CA+Tgmoao96EuNeSPd+hspRKcsCddu=b1h-QNRuKfY8VmfNQdfg@mail.gmail.com
rescanLatestTimeLine() contains a guard against switching to
a timeline that forked off from the current one prior to the
current recovery point, but that guard does not work if the
timeline switch occurs before the first WAL recod (which must
be the checkpoint record) is read. Without this patch, an
improper timeline switch is therefore possible in such cases.
This happens because rescanLatestTimeLine() relies on the global
variable EndRecPtr to understand the current position of WAL
replay. However, EndRecPtr at this point in the code contains
the endpoint of the last-replayed record, not the startpoint or
endpoint of the record being replayed now. Thus, before any
records have been replayed, it's zero, which causes the sanity
check to always pass.
To fix, pass down the correct timeline explicitly. The
EndRecPtr value we want is the one from the xlogreader, which
will be the starting position of the record we're about to
try to read, rather than the global variable, which is the
ending position of the last record we successfully read.
They're usually the same, but not in the corner case described
here.
No back-patch, because in v14 and earlier branhes, we were using
the wrong TLI here as well as the wrong LSN. In master, that was
fixed by commit 4a92a1c3d1, but
that and it's prerequisite patches are too invasive to
back-patch for such a minor issue.
Patch by me, reviewed by Amul Sul.
Discussion: http://postgr.es/m/CA+Tgmoao96EuNeSPd+hspRKcsCddu=b1h-QNRuKfY8VmfNQdfg@mail.gmail.com
It's possible that a subplan below a Memoize node contains a parameter
from above the Memoize node. If this parameter changes then cache entries
may become out-dated due to the new parameter value.
Previously Memoize was mistakenly not aware of this. We fix this here by
flushing the cache whenever a parameter that's not part of the cache
key changes.
Bug: #17213
Reported by: Elvis Pranskevichus
Author: David Rowley
Discussion: https://postgr.es/m/17213-988ed34b225a2862@postgresql.org
Backpatch-through: 14, where Memoize was added
Same macro names for SnapBuildOnDiskNotChecksummedSize and
SnapBuildOnDiskChecksummedSize are being used in slot.c and snapbuild.c.
This patch renames them, in slot.c, to
ReplicationSlotOnDiskNotChecksummedSize and
ReplicationSlotOnDiskChecksummedSize similar to the other macros. This
makes all macro names look consistent in slot.c.
Author: Bharath Rupireddy
Discussion: https://postgr.es/m/CALj2ACVZo-piDGzBOJRY4ob=_goFR6t9DhZMDMjJWN7LQs34Aw@mail.gmail.com
It's possible that a subplan below a Memoize node contains a parameter
from above the Memoize node. If this parameter changes then cache entries
may become out-dated due to the new parameter value.
Previously Memoize was mistakenly not aware of this. We fix this here by
flushing the cache whenever a parameter that's not part of the cache
key changes.
Bug: #17213
Reported by: Elvis Pranskevichus
Author: David Rowley
Discussion: https://postgr.es/m/17213-988ed34b225a2862@postgresql.org
Backpatch-through: 14, where Memoize was added
Memoize would always use the hash equality operator for the cache key
types to determine if the current set of parameters were the same as some
previously cached set. Certain types such as floating points where -0.0
and +0.0 differ in their binary representation but are classed as equal by
the hash equality operator may cause problems as unless the join uses the
same operator it's possible that whichever join operator is being used
would be able to distinguish the two values. In which case we may
accidentally return in the incorrect rows out of the cache.
To fix this here we add a binary mode to Memoize to allow it to the
current set of parameters to previously cached values by comparing
bit-by-bit rather than logically using the hash equality operator. This
binary mode is always used for LATERAL joins and it's used for normal
joins when any of the join operators are not hashable.
Reported-by: Tom Lane
Author: David Rowley
Discussion: https://postgr.es/m/3004308.1632952496@sss.pgh.pa.us
Backpatch-through: 14, where Memoize was added
This commit adds a set of functions able to look at the contents of
various paths related to replication slots:
- pg_ls_logicalsnapdir, for pg_logical/snapshots/
- pg_ls_logicalmapdir, for pg_logical/mappings/
- pg_ls_replslotdir, for pg_replslot/<slot_name>/
These are intended to be used by monitoring tools. Unlike pg_ls_dir(),
execution permission can be granted to non-superusers. Roles members of
pg_monitor gain have access to those functions.
Bump catalog version.
Author: Bharath Rupireddy
Reviewed-by: Nathan Bossart, Justin Pryzby
Discussion: https://postgr.es/m/CALj2ACWsfizZjMN6bzzdxOk1ADQQeSw8HhEjhmVXn_Pu+7VzLw@mail.gmail.com
A couple of spots can benefit from an added errdetail(), which matches
what we were already doing in other places; and those that cannot
withstand errdetail() can get a more descriptive primary message.
Author: Bharath Rupireddy <bharath.rupireddyforpostgres@gmail.com>
Reviewed-by: Daniel Gustafsson <daniel@yesql.se>
Reviewed-by: Julien Rouhaud <rjuju123@gmail.com>
Discussion: https://postgr.es/m/CALj2ACV+cX1eM03GfcA=ZMLXh5fSn1X1auJLz3yuS1duPSb9QA@mail.gmail.com
A few strings (one WARNING and some memory context names) in the
autovacuum code were written in a world where "worker" had no other
possible meaning than "autovacuum worker", but that's long time gone.
Be more specific about it.
Also, change the WARNING from elog() to ereport(), to add translability.
Author: Bharath Rupireddy <bharath.rupireddyforpostgres@gmail.com>
Reviewed-by: Nathan Bossart <bossartn@amazon.com>
Reviewed-by: Justin Pryzby <pryzby@telsasoft.com>
Reviewed-by: Kyotaro Horiguchi <horikyota.ntt@gmail.com>
Reviewed-by: Dilip Kumar <dilipbalaut@gmail.com>
Reviewed-by: Masahiko Sawada <sawada.mshk@gmail.com>
Discussion: https://postgr.es/m/CALj2ACX2UHp76dqdoZq92a7v4APFuV5wJQ+AUrb+2HURrKN=NQ@mail.gmail.com
This doesn't belong next to very high level discussion of the tasks that
lazy_scan_heap performs. There is already a similar, longer comment
block at the top of vacuumlazy.c that mentions lazy_scan_heap directly.
Commit ac9099fc1 rearranged the logic in spgGetCache() that determines
the index's attType (nominal input data type) and leafType (actual
type stored in leaf index tuples). Turns out this broke things for
the case where (a) the actual input data type is different from the
nominal type, (b) the opclass's config function leaves leafType
defaulted, and (c) the opclass has no "compress" function. (b) caused
us to assign the actual input data type as leafType, and then since
that's not attType, we complained that a "compress" function is
required. For non-polymorphic opclasses, condition (a) arises in
binary-compatible cases, such as using SP-GiST text_ops for a varchar
column, or using any opclass on a domain over its nominal input type.
To fix, use attType for leafType when the index's declared column type
is different from but binary-compatible with attType. Do this only in
the defaulted-leafType case, to avoid overriding any explicit
selection made by the opclass.
Per bug #17294 from Ilya Anfimov. Back-patch to v14.
Discussion: https://postgr.es/m/17294-8f6c7962ce877edc@postgresql.org
This allows a later commit to reduce the number of branches in performance
sensitive functions during normal running, compared to a very minor saving
during bootstrapping.
Author: Melanie Plageman <melanieplageman@gmail.com>
Reviewed-By: Andres Freund <andres@anarazel.de>
Discussion: https://postgr.es/m/CAAKRu_Yeg+vh6SHNEo1+=O7e-BPX35cU0XQM=YwQRnkFyv_y+w@mail.gmail.com
While determining xid horizons, we skip over backends that are running
Vacuum. We also ignore Create Index Concurrently, or Reindex Concurrently
for the purposes of computing Xmin for Vacuum. But we were not setting the
flags corresponding to these operations when they are performed in
parallel which was preventing Xid horizon from advancing.
The optimization related to skipping Create Index Concurrently, or Reindex
Concurrently operations was implemented in PG-14 but the fix is the same
for the Parallel Vacuum as well so back-patched till PG-13.
Author: Masahiko Sawada
Reviewed-by: Amit Kapila
Backpatch-through: 13
Discussion: https://postgr.es/m/CAD21AoCLQqgM1sXh9BrDFq0uzd3RBFKi=Vfo6cjjKODm0Onr5w@mail.gmail.com
Up to now, you couldn't escape out of psql's \password command
by typing control-C (or other local spelling of SIGINT). This
is pretty user-unfriendly, so improve it. To do so, we have to
modify the functions provided by pg_get_line.c; but we don't
want to mess with psql's SIGINT handler setup, so provide an
API that lets that handler cause the cancel to occur.
This relies on the assumption that we won't do any major harm by
longjmp'ing out of fgets(). While that's obviously a little shaky,
we've long had the same assumption in the main input loop, and few
issues have been reported.
psql has some other simple_prompt() calls that could usefully
be improved the same way; for now, just deal with \password.
Nathan Bossart, minor tweaks by me
Discussion: https://postgr.es/m/747443.1635536754@sss.pgh.pa.us
This fills in some gaps in planner support for starts_with() and
the equivalent ^@ operator:
* A condition such as "textcol ^@ constant" can now use a regular
btree index, not only an SP-GiST index, so long as the index's
collation is C. (This works just like "textcol LIKE 'foo%'".)
* "starts_with(textcol, constant)" can be optimized the same as
"textcol ^@ constant".
* Fixed-prefix LIKE and regex patterns are now more like starts_with()
in another way: if you apply one to an SPGiST-indexed column, you'll
get an index condition using ^@ rather than two index conditions with
>= and <.
Per a complaint from Shay Rojansky. Patch by me; thanks to
Nathan Bossart for review.
Discussion: https://postgr.es/m/232599.1633800229@sss.pgh.pa.us
If a SQL-standard function body contains an INSERT ... SELECT statement,
any function parameters referenced within the SELECT were always printed
in $N style, rather than using the parameter name if any. While not
strictly incorrect, this wasn't the intention, and it's inconsistent
with the way that such parameters would be printed in any other kind
of statement.
The cause is that the recursion to get_query_def from
get_insert_query_def neglected to pass down the context->namespaces
list, passing constant NIL instead. This is a very ancient oversight,
but AFAICT it had no visible consequences before commit e717a9a18
added an outermost namespace with function parameters. We don't allow
INSERT ... SELECT as a sub-query, except in a top-level WITH clause,
where it couldn't contain any outer references that might need to access
upper namespaces. So although that's arguably a bug, I don't see any
point in changing it before v14.
In passing, harden the code added to get_parameter by e717a9a18 so that
it won't crash if a PARAM_EXTERN Param appears in an unexpected place.
Per report from Erki Eessaar. Code fix by me, regression test case
by Masahiko Sawada.
Discussion: https://postgr.es/m/AM9PR01MB8268347BED344848555167FAFE949@AM9PR01MB8268.eurprd01.prod.exchangelabs.com
Commit 81d5995b4b introduced more fine-grained errormessages for
incorrect relkinds for publication, while unlogged and temporary
tables were reported with using the same message. This provides
separate error messages for these types of relpersistence.
Author: Bharath Rupireddy <bharath.rupireddyforpostgres@gmail.com>
Reviewed-by: Peter Eisentraut <peter.eisentraut@enterprisedb.com>
Reviewed-by: Jeevan Ladhe <jeevan.ladhe@enterprisedb.com>
Reviewed-by: Euler Taveira <euler@eulerto.com>
Discussion: https://postgr.es/m/CALj2ACW9S=AswyQHjtO6WMcsergMkCBTtzXGrM8DX26DzfeTLQ@mail.gmail.com
At present, there is an undocumented coding rule that you must call
RecoveryInProgress(), or do something else that results in a call
to InitXLogInsert(), before trying to write WAL. Otherwise, the
WAL construction buffers won't be initialized, resulting in
failures.
Since it's not good to rely on a status inquiry function like
RecoveryInProgress() having the side effect of initializing
critical data structures, instead do the initialization eariler,
when the backend first starts up.
Patch by me. Reviewed by Nathan Bossart and Michael Paquier.
Discussion: http://postgr.es/m/CA+TgmoY7b65qRjzHN_tWUk8B4sJqk1vj1d31uepVzmgPnZKeLg@mail.gmail.com
When changing REPLICA IDENTITY INDEX to another one, the target table's
relcache was not being invalidated. This leads to skipping update/delete
operations during apply on the subscriber side as the columns required to
search corresponding rows won't get logged.
Author: Tang Haiying, Hou Zhijie
Reviewed-by: Euler Taveira, Amit Kapila
Backpatch-through: 10
Discussion: https://postgr.es/m/OS0PR01MB61133CA11630DAE45BC6AD95FB939@OS0PR01MB6113.jpnprd01.prod.outlook.com
Add a comment explaining why the pgstats accounting used during
opportunistic heap pruning operations (to maintain the current number of
dead tuples in the relation) needs to compensate by subtracting away the
number of new LP_DEAD items. This is needed so it can avoid completely
forgetting about tuples that become LP_DEAD items during pruning -- they
should still count.
It seems more natural to discuss this issue at the only relevant call
site (opportunistic pruning), since the same issue does not apply to the
only other caller (the VACUUM call site). Move everything there too.
Author: Peter Geoghegan <pg@bowt.ie>
Discussion: https://postgr.es/m/CAH2-Wzm7f+A6ej650gi_ifTgbhsadVW5cujAL3punpupHff5Yg@mail.gmail.com
pg_stat_get_slru() in pgstatfuncs.c would point to one element after the
end of the array PgStat_SLRUStats when finishing to scan its entries.
This had no direct consequences as no data from the extra memory area
was read, but static analyzers would rightfully complain here. So let's
be clean.
While on it, this adds one regression test in the area reserved for
system views.
Reported-by: Alexander Kozhemyakin, via AddressSanitizer
Author: Kyotaro Horiguchi
Discussion: https://postgr.es/m/17280-37da556e86032070@postgresql.org
Backpatch-through: 13
Buildfarm members kittiwake and tadarida have witnessed errors at this
site. The site discarded key facts. Back-patch to v10 (all supported
versions).
Reviewed by Michael Paquier and Tom Lane.
Discussion: https://postgr.es/m/20211107013157.GB790288@rfd.leadboat.com
It is up to the heap_page_prune() caller to decide what to do about
updating the FSM for a page following pruning. Update old comments that
address what we might want to do as if it was the responsibility of
heap_page_prune() itself. heap_page_prune() doesn't have enough
high-level context to make a sensible choice.
Presently, the archive_status directory was scanned for each file to
archive. When there are many status files, say because archive_command
has been failing for a long time, these directory scans can get very
slow. With this change, the archiver remembers several files to archive
during each directory scan, speeding things up.
To ensure timeline history files are archived as quickly as possible,
XLogArchiveNotify() forces the archiver to do a new directory scan as
soon as the .ready file for one is created.
Nathan Bossart, per a long discussion involving many people. It is
not clear to me exactly who out of all those people reviewed this
particular patch.
Discussion: http://postgr.es/m/CA+TgmobhAbs2yabTuTRkJTq_kkC80-+jw=pfpypdOJ7+gAbQbw@mail.gmail.com
Discussion: http://postgr.es/m/620F3CE1-0255-4D66-9D87-0EADE866985A@amazon.com
protocol.sgml documented the layout for Type messages, but completely
dropped the ball otherwise, failing to explain what they are, when
they are sent, or what they're good for. While at it, do a little
copy-editing on the description of Relation messages.
In passing, adjust the comment for apply_handle_type() to make it
clearer that we choose not to do anything when receiving a Type
message, not that we think it has no use whatsoever.
Per question from Stefen Hillman.
Discussion: https://postgr.es/m/CAPgW8pMknK5pup6=T4a_UG=Cz80Rgp=KONqJmTdHfaZb0RvnFg@mail.gmail.com
Commit 5a1007a508 tried to introduce
an assertion that the block size was at least twice the size of a
tar block, but I got the math wrong. My error was reported to me
off-list.
In XLogCtlData, rename the structure member ThisTimeLineID to
InsertTimeLineID and update the comments to make clear that it's only
expected to be set after recovery is complete.
In StartupXLOG, replace the local variables ThisTimeLineID and
PrevTimeLineID with new local variables replayTLI and newTLI. In the
old scheme, ThisTimeLineID was the replay TLI until we created a new
timeline, and after that the replay TLI was in PrevTimeLineID. Now,
replayTLI is the TLI from which we last replayed WAL throughout the
entire function, and newTLI is either that, or the new timeline created
upon promotion.
Remove some misleading comments from the comment block just above where
recoveryTargetTimeLineGoal and friends are declared. It's become
incorrect, not only because ThisTimeLineID as a variable is now gone,
but also because the rmgr code does not care about ThisTimeLineID and
has not since what used to be the TLI field in the page header was
repurposed to store the page checksum.
Add a comment GetFlushRecPtr that it's only supposed to be used in
normal running, and an assertion to verify that this is so.
Per some ideas from Michael Paquier and some of my own. Review by
Michael Paquier also.
Discussion: http://postgr.es/m/CA+TgmoY1a2d1AnVR3tJcKmGGkhj7GGrwiNwjtKr21dxOuLBzCQ@mail.gmail.com
A couple of code paths related to logical decoding (WAL sender, slot
advancing, etc.) use XLogReadRecord(), feeding on error messages
generated by walreader.c on a failure. All those messages have no
context, making it harder to spot from where an error could come even if
these should not happen. All the other callers of XLogReadRecord() do
that already.
Reviewed-by: Kyotaro Horiguchi
Discussion: https://postgr.es/m/YYnTH6OyOwQcAdkw@paquier.xyz
Earlier versions of PostgreSQL featured a version of pg_basebackup
that wanted to edit tar archives but was too dumb to parse them
properly. The server made things easier for the client by failing
to add the two blocks of zero bytes that ought to end a tar file,
leaving it up to the client to do that.
But since commit 23a1c6578c, we
don't need this hack any more, because pg_basebackup is now smarter
and can parse tar files even if they are properly terminated! So
change the server to always properly terminate the tar files. Older
versions of pg_basebackup can't talk to new servers anyway, so
there's no compatibility break.
On the pg_basebackup side, we see still need to add the terminating
zero bytes if we're talking to an older server, but not when the
server is v15+. Hopefully at some point we'll be able to remove
some of this compatibility cruft, but it seems best to hang on to
it for now.
In passing, add a file header comment to bbstreamer_tar.c, to make
it clearer what's going on here.
Discussion: http://postgr.es/m/CA+TgmoZbNzsWwM4BE5Jb_qHncY817DYZwGf+2-7hkMQ27ZwsMQ@mail.gmail.com
This check was used to accommodate a staggering variety in particular
in the type of the third argument of accept(). This is no longer of
concern on currently supported systems. We can just use socklen_t in
the code and put in a simple check that substitutes int for socklen_t
if it's missing, to cover the few stragglers.
Reviewed-by: Andres Freund <andres@anarazel.de>
Discussion: https://www.postgresql.org/message-id/3538f4c4-1886-64f2-dcff-aaad8267fb82@enterprisedb.com
Commit 5a2832465f introduced some enums to represent all tables in schema
publications and used REL in their names. Use TABLE instead of REL in
those enums to avoid confusion with other objects like SEQUENCES that can
be part of a publication in the future.
In the passing, (a) Change one of the newly introduced error messages to
make it consistent for Create and Alter commands, (b) add missing alias in
one of the SQL Statements that is used to print publications associated
with the table.
Reported-by: Tomas Vondra, Peter Smith
Author: Vignesh C
Reviewed-by: Hou Zhijie, Peter Smith
Discussion: https://www.postgresql.org/message-id/CALDaNm0OANxuJ6RXqwZsM1MSY4s19nuH3734j4a72etDwvBETQ%40mail.gmail.com
The server collects up to a bufferload of data whenever it reads data
from the client socket. When SSL or GSS encryption is requested
during startup, any additional data received with the initial
request message remained in the buffer, and would be treated as
already-decrypted data once the encryption handshake completed.
Thus, a man-in-the-middle with the ability to inject data into the
TCP connection could stuff some cleartext data into the start of
a supposedly encryption-protected database session.
This could be abused to send faked SQL commands to the server,
although that would only work if the server did not demand any
authentication data. (However, a server relying on SSL certificate
authentication might well not do so.)
To fix, throw a protocol-violation error if the internal buffer
is not empty after the encryption handshake.
Our thanks to Jacob Champion for reporting this problem.
Security: CVE-2021-23214
In v14, because we don't have a field in RestrictInfo to cache both the
left and right type's hash equality operator, we just restrict the scope
of Memoize to only when the left and right types of a RestrictInfo are the
same.
In master we add another field to RestrictInfo and cache both hash
equality operators.
Reported-by: Jaime Casanova
Author: David Rowley
Discussion: https://postgr.es/m/20210929185544.GB24346%40ahch-to
Backpatch-through: 14
Quite a few buildfarm animals are warning about this, and lapwing
is actually failing (because -Werror). It's a false positive AFAICS,
so no need to do more than zero the variable to start with.
Discussion: https://postgr.es/m/YYXJnUxgw9dZKxlX@paquier.xyz
Peter Geoghegan
Alvaro Herrera
Daniel Gustafsson
Peter Eisentraut
Michael Paquier
Andres Freund
Robert Haas
David Rowley
Amit Kapila
Fujii Masao
Tom Lane
Noah Misch
Jeff Davis