Commit Graph

49307 Commits

Author SHA1 Message Date
Tom Lane 288e499ba8 postgres_fdw: set search_path to 'pg_catalog' while deparsing constants.
The motivation for this is to ensure successful transmission of the
values of constants of regconfig and other reg* types.  The remote
will be reading them with search_path = 'pg_catalog', so schema
qualification is necessary when referencing objects in other schemas.

Per bug #17483 from Emmanuel Quincerot.  Back-patch to all supported
versions.  (There's some other stuff to do here, but it's less
back-patchable.)

Discussion: https://postgr.es/m/1423433.1652722406@sss.pgh.pa.us
2022-07-17 17:27:50 -04:00
Thomas Munro 1661c40b9d Make dsm_impl_posix_resize more future-proof.
Commit 4518c798 blocks signals for a short region of code, but it
assumed that whatever called it had the signal mask set to UnBlockSig on
entry.  That may be true today (or may even not be, in extensions in the
wild), but it would be better not to make that assumption.  We should
save-and-restore the caller's signal mask.

The PG_SETMASK() portability macro couldn't be used for that, which is
why it wasn't done before.  But... considering that commit a65e0864
established back in 9.6 that supported POSIX systems have sigprocmask(),
and that this is POSIX-only code, there is no reason not to use standard
sigprocmask() directly to achieve that.

Back-patch to all supported releases, like 4518c798 and 80845b7c.

Reviewed-by: Alvaro Herrera <alvherre@alvh.no-ip.org>
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/CA%2BhUKGKx6Biq7_UuV0kn9DW%2B8QWcpJC1qwhizdtD9tN-fn0H0g%40mail.gmail.com
2022-07-16 12:23:34 +12:00
Bruce Momjian 27b8f73fd3 pg_upgrade doc: mention that replication slots must be recreated
Reported-by: Nikhil Shetty

Discussion: https://postgr.es/m/CAFpL5Vxastip0Jei-K-=7cKXTg=5sahSe5g=om=x68NOX8+PUA@mail.gmail.com

Backpatch-through: 10
2022-07-14 16:34:30 -04:00
Bruce Momjian 613e5a3123 doc: add documentation about ecpg Oracle-compatibility mode
Reported-by: Takeshi Ideriha

Discussion: https://postgr.es/m/TYCPR01MB7041A157067208327D8DAAF9EAA59@TYCPR01MB7041.jpnprd01.prod.outlook.com

Backpatch-through: 11
2022-07-14 16:19:45 -04:00
Bruce Momjian d73ea6160a doc: clarify the behavior of identically-named savepoints
Original patch by David G. Johnston.

Reported-by: David G. Johnston

Discussion: https://postgr.es/m/CAKFQuwYQCxSSuSL18skCWG8QHFswOJ3hjovHsOZUE346i4OpVQ@mail.gmail.com

Backpatch-through: 10
2022-07-14 15:44:22 -04:00
Bruce Momjian afc8ee1e8c doc: clarify that "excluded" ON CONFLICT is a single row
Original patch by David G. Johnston.

Reported-by: David G. Johnston

Discussion: https://postgr.es/m/CAKFQuwa4J0+WuO7kW1PLbjoEvzPN+Q_j+P2bXxNnCLaszY7ZdQ@mail.gmail.com

Backpatch-through: 10
2022-07-14 15:33:28 -04:00
Bruce Momjian ac480b074f doc: mention that INSERT can block because of unique indexes
Initial patch by David G. Johnston.

Reported-by: David G. Johnston

Discussion: https://postgr.es/m/CAKFQuwZpbdzceO41VE-xt1Xh8rWRRfgopTAK1wL9EhCo0Am-Sw@mail.gmail.com

Backpatch-through: 10
2022-07-14 15:17:19 -04:00
Bruce Momjian 64695a3ce6 doc: mention the pg_locks lock names in parentheses
Reported-by: Troy Frericks

Discussion: https://postgr.es/m/165653551130.665.8240515669521441325@wrigleys.postgresql.org

Backpatch-through: 10
2022-07-14 12:08:54 -04:00
Thomas Munro a05f40ef87 Don't clobber postmaster sigmask in dsm_impl_resize.
Commit 4518c798 intended to block signals in regular backends that
allocate DSM segments, but dsm_impl_resize() is also reached by
dsm_postmaster_startup().  It's not OK to clobber the postmaster's
signal mask, so only manipulate the signal mask when under the
postmaster.

Back-patch to all releases, like 4518c798.

Discussion: https://postgr.es/m/CA%2BhUKGKNpK%3D2OMeea_AZwpLg7Bm4%3DgYWk7eDjZ5F6YbozfOf8w%40mail.gmail.com
2022-07-15 02:06:01 +12:00
Thomas Munro ff78bf796d Block signals while allocating DSM memory.
On Linux, we call posix_fallocate() on shm_open()'d memory to avoid
later potential SIGBUS (see commit 899bd785).

Based on field reports of systems stuck in an EINTR retry loop there,
there, we made it possible to break out of that loop via slightly odd
coding where the CHECK_FOR_INTERRUPTS() call was somewhat removed from
the loop (see commit 422952ee).

On further reflection, that was not a great choice for at least two
reasons:

1.  If interrupts were held, the CHECK_FOR_INTERRUPTS() would do nothing
and the EINTR error would be surfaced to the user.

2.  If EINTR was reported but neither QueryCancelPending nor
ProcDiePending was set, then we'd dutifully retry, but with a bit more
understanding of how posix_fallocate() works, it's now clear that you
can get into a loop that never terminates.  posix_fallocate() is not a
function that can do some of the job and tell you about progress if it's
interrupted, it has to undo what it's done so far and report EINTR, and
if signals keep arriving faster than it can complete (cf recovery
conflict signals), you're stuck.

Therefore, for now, we'll simply block most signals to guarantee
progress.  SIGQUIT is not blocked (see InitPostmasterChild()), because
its expected handler doesn't return, and unblockable signals like
SIGCONT are not expected to arrive at a high rate.  For good measure,
we'll include the ftruncate() call in the blocked region, and add a
retry loop.

Back-patch to all supported releases.

Reported-by: Alvaro Herrera <alvherre@alvh.no-ip.org>
Reported-by: Nicola Contu <nicola.contu@gmail.com>
Reviewed-by: Alvaro Herrera <alvherre@alvh.no-ip.org>
Reviewed-by: Andres Freund <andres@anarazel.de>
Discussion: https://postgr.es/m/20220701154105.jjfutmngoedgiad3%40alvherre.pgsql
2022-07-14 14:26:49 +12:00
Thomas Munro 4f88dbac22 Fix lock assertions in dshash.c.
dshash.c previously maintained flags to be able to assert that you
didn't hold any partition lock.  These flags could get out of sync with
reality in error scenarios.

Get rid of all that, and make assertions about the locks themselves
instead.  Since LWLockHeldByMe() loops internally, we don't want to put
that inside another loop over all partition locks.  Introduce a new
debugging-only interface LWLockAnyHeldByMe() to avoid that.

This problem was noted by Tom and Andres while reviewing changes to
support the new shared memory stats system, and later showed up in
reality while working on commit 389869af.

Back-patch to 11, where dshash.c arrived.

Reported-by: Tom Lane <tgl@sss.pgh.pa.us>
Reported-by: Andres Freund <andres@anarazel.de>
Reviewed-by: Kyotaro HORIGUCHI <horiguchi.kyotaro@lab.ntt.co.jp>
Reviewed-by: Zhihong Yu <zyu@yugabyte.com>
Reviewed-by: Andres Freund <andres@anarazel.de>
Discussion: https://postgr.es/m/20220311012712.botrpsikaufzteyt@alap3.anarazel.de
Discussion: https://postgr.es/m/CA%2BhUKGJ31Wce6HJ7xnVTKWjFUWQZPBngxfJVx4q0E98pDr3kAw%40mail.gmail.com
2022-07-11 15:51:47 +12:00
Thomas Munro 09224a35cd Fix \watch's interaction with libedit on ^C.
When you hit ^C, the terminal driver in Unix-like systems echoes "^C" as
well as sending an interrupt signal (depending on stty settings).  At
least libedit (but maybe also libreadline) is then confused about the
current cursor location, and corrupts the display if you try to scroll
back.  Fix, by moving to a new line before the next prompt is displayed.

Back-patch to all supported released.

Author: Pavel Stehule <pavel.stehule@gmail.com>
Reported-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/3278793.1626198638%40sss.pgh.pa.us
2022-07-10 16:54:09 +12:00
Bruce Momjian f02f0b8cea doc: add pg_prewarm example
Discussion: https://postgr.es/m/20220618085541.ezxdaljlpo6x7msc@home-desktop

Author: Dong Wook Lee

Backpatch-through: 11
2022-07-08 18:36:27 -04:00
Dean Rasheed f9c655d647 Fix alias matching in transformLockingClause().
When locking a specific named relation for a FOR [KEY] UPDATE/SHARE
clause, transformLockingClause() finds the relation to lock by
scanning the rangetable for an RTE with a matching eref->aliasname.
However, it failed to account for the visibility rules of a join RTE.

If a join RTE doesn't have a user-supplied alias, it will have a
generated eref->aliasname of "unnamed_join" that is not visible as a
relation name in the parse namespace. Such an RTE needs to be skipped,
otherwise it might be found in preference to a regular base relation
with a user-supplied alias of "unnamed_join", preventing it from being
locked.

In addition, if a join RTE doesn't have a user-supplied alias, but
does have a join_using_alias, then the RTE needs to be matched using
that alias rather than the generated eref->aliasname, otherwise a
misleading "relation not found" error will be reported rather than a
"join cannot be locked" error.

Backpatch all the way, except for the second part which only goes back
to 14, where JOIN USING aliases were added.

Dean Rasheed, reviewed by Tom Lane.

Discussion: https://postgr.es/m/CAEZATCUY_KOBnqxbTSPf=7fz9HWPnZ5Xgb9SwYzZ8rFXe7nb=w@mail.gmail.com
2022-07-07 13:07:57 +01:00
Alvaro Herrera 7c2b79c2bc
BRIN: improve documentation on summarization
The existing wording wasn't clear enough and some details weren't
anywhere, such as the fact that autosummarization is off by default.
Improve.

Authors: Roberto Mello, Jaime Casanova, Justin Pryzby, Álvaro Herrera
Discussion: https://postgr.es/m/CAKz==bK_NoJytRyQfX8K-erCW3Ff7--oGYpiB8+ePVS7dRVW_A@mail.gmail.com
Discussion: https://postgr.es/m/20220224193520.GY9008@telsasoft.com
2022-07-05 13:38:26 +02:00
Andrew Dunstan 2cf875a4b5 Remove %error-verbose directive from jsonpath parser
None of the other bison parsers contains this directive, and it gives
rise to some unfortunate and impenetrable messages, so just remove it.

Backpatch to release 12, where it was introduced.

Per gripe from Erik Rijkers

Discussion: https://postgr.es/m/ba069ce2-a98f-dc70-dc17-2ccf2a9bf7c7@xs4all.nl
2022-07-03 17:17:08 -04:00
Noah Misch a4240139fc Fix previous commit's ecpg_clocale for ppc Darwin.
Per buildfarm member prairiedog, this platform rejects uninitialized
global variables in shared libraries.  Back-patch to v10, like the
addition of the variable.

Reviewed by Tom Lane.

Discussion: https://postgr.es/m/20220703030619.GB2378460@rfd.leadboat.com
2022-07-02 21:03:23 -07:00
Noah Misch 5e0b8f3f4f ecpglib: call newlocale() once per process.
ecpglib has been calling it once per SQL query and once per EXEC SQL GET
DESCRIPTOR.  Instead, if newlocale() has not succeeded before, call it
while establishing a connection.  This mitigates three problems:
- If newlocale() failed in EXEC SQL GET DESCRIPTOR, the command silently
  proceeded without the intended locale change.
- On AIX, each newlocale()+freelocale() cycle leaked memory.
- newlocale() CPU usage may have been nontrivial.

Fail the connection attempt if newlocale() fails.  Rearrange
ecpg_do_prologue() to validate the connection before its uselocale().

The sort of program that may regress is one running in an environment
where newlocale() fails.  If that program establishes connections
without running SQL statements, it will stop working in response to this
change.  I'm betting against the importance of such an ECPG use case.
Most SQL execution (any using ECPGdo()) has long required newlocale()
success, so there's little a connection could do without newlocale().

Back-patch to v10 (all supported versions).

Reviewed by Tom Lane.  Reported by Guillaume Lelarge.

Discussion: https://postgr.es/m/20220101074055.GA54621@rfd.leadboat.com
2022-07-02 13:00:34 -07:00
Thomas Munro f7b69b1e31 Harden dsm_impl.c against unexpected EEXIST.
Previously, we trusted the OS not to report EEXIST unless we'd passed in
IPC_CREAT | IPC_EXCL or O_CREAT | O_EXCL, as appropriate.  Solaris's
shm_open() can in fact do that, causing us to crash because we didn't
ereport and then we blithely assumed the mapping was successful.

Let's treat EEXIST just like any other error, unless we're actually
trying to create a new segment.  This applies to shm_open(), where this
behavior has been seen, and also to the equivalent operations for our
sysv and mmap modes just on principle.

Based on the underlying reason for the error, namely contention on a
lock file managed by Solaris librt for each distinct name, this problem
is only likely to happen on 15 and later, because the new shared memory
stats system produces shm_open() calls for the same path from
potentially large numbers of backends concurrently during
authentication.  Earlier releases only shared memory segments between a
small number of parallel workers under one Gather node.  You could
probably hit it if you tried hard enough though, and we should have been
more defensive in the first place.  Therefore, back-patch to all
supported releases.

Per build farm animal margay.  This isn't the end of the story, though,
it just changes random crashes into random "File exists" errors; more
work needed for a green build farm.

Reviewed-by: Robert Haas <robertmhaas@gmail.com>
Discussion: https://postgr.es/m/CA%2BhUKGKqKrCV5xKWfh9rnm%3Do%3DDwZLTLtnsj_XpUi9g5%3DV%2B9oyg%40mail.gmail.com
2022-07-01 13:26:50 +12:00
Heikki Linnakangas af530898eb Fix visibility check when XID is committed in CLOG but not in procarray.
TransactionIdIsInProgress had a fast path to return 'false' if the
single-item CLOG cache said that the transaction was known to be
committed. However, that was wrong, because a transaction is first
marked as committed in the CLOG but doesn't become visible to others
until it has removed its XID from the proc array. That could lead to an
error:

    ERROR:  t_xmin is uncommitted in tuple to be updated

or for an UPDATE to go ahead without blocking, before the previous
UPDATE on the same row was made visible.

The window is usually very short, but synchronous replication makes it
much wider, because the wait for synchronous replica happens in that
window.

Another thing that makes it hard to hit is that it's hard to get such
a commit-in-progress transaction into the single item CLOG cache.
Normally, if you call TransactionIdIsInProgress on such a transaction,
it determines that the XID is in progress without checking the CLOG
and without populating the cache. One way to prime the cache is to
explicitly call pg_xact_status() on the XID. Another way is to use a
lot of subtransactions, so that the subxid cache in the proc array is
overflown, making TransactionIdIsInProgress rely on pg_subtrans and
CLOG checks.

This has been broken ever since it was introduced in 2008, but the race
condition is very hard to hit, especially without synchronous
replication. There were a couple of reports of the error starting from
summer 2021, but no one was able to find the root cause then.

TransactionIdIsKnownCompleted() is now unused. In 'master', remove it,
but I left it in place in backbranches in case it's used by extensions.

Also change pg_xact_status() to check TransactionIdIsInProgress().
Previously, it only checked the CLOG, and returned "committed" before
the transaction was actually made visible to other queries. Note that
this also means that you cannot use pg_xact_status() to reproduce the
bug anymore, even if the code wasn't fixed.

Report and analysis by Konstantin Knizhnik. Patch by Simon Riggs, with
the pg_xact_status() change added by me.

Author: Simon Riggs
Reviewed-by: Andres Freund
Discussion: https://www.postgresql.org/message-id/flat/4da7913d-398c-e2ad-d777-f752cf7f0bbb%40garret.ru
2022-06-27 08:24:36 +03:00
Noah Misch fe25c8533c Fix PostgreSQL::Test aliasing for Perl v5.10.1.
This Perl segfaults if a declaration of the to-be-aliased package
precedes the aliasing itself.  Per buildfarm members lapwing and wrasse.
Like commit 20911775de, back-patch to v10
(all supported versions).

Discussion: https://postgr.es/m/20220625171533.GA2012493@rfd.leadboat.com
2022-06-25 14:16:00 -07:00
Noah Misch 93731d549e CREATE INDEX: use the original userid for more ACL checks.
Commit a117cebd63 used the original userid
for ACL checks located directly in DefineIndex(), but it still adopted
the table owner userid for more ACL checks than intended.  That broke
dump/reload of indexes that refer to an operator class, collation, or
exclusion operator in a schema other than "public" or "pg_catalog".
Back-patch to v10 (all supported versions), like the earlier commit.

Nathan Bossart and Noah Misch

Discussion: https://postgr.es/m/f8a4105f076544c180a87ef0c4822352@stmuk.bayern.de
2022-06-25 09:07:45 -07:00
Noah Misch ec26f44d53 For PostgreSQL::Test compatibility, alias entire package symbol tables.
Remove the need to edit back-branch-specific code sites when
back-patching the addition of a PostgreSQL::Test::Utils symbol.  Replace
per-symbol, incomplete alias lists.  Give old and new package names the
same EXPORT and EXPORT_OK semantics.  Back-patch to v10 (all supported
versions).

Reviewed by Andrew Dunstan.

Discussion: https://postgr.es/m/20220622072144.GD4167527@rfd.leadboat.com
2022-06-25 09:07:45 -07:00
Amit Kapila 9e0d9a24ef Fix memory leak due to LogicalRepRelMapEntry.attrmap.
When rebuilding the relation mapping on subscribers, we were not releasing
the attribute mapping's memory which was no longer required.

The attribute mapping used in logical tuple conversion was refactored in
PG13 (by commit e1551f96e6) but we forgot to update the related code that
frees the attribute map.

Author: Hou Zhijie
Reviewed-by: Amit Langote, Amit Kapila, Shi yu
Backpatch-through: 10, where it was introduced
Discussion: https://postgr.es/m/OSZPR01MB6310F46CD425A967E4AEF736FDA49@OSZPR01MB6310.jpnprd01.prod.outlook.com
2022-06-23 08:47:15 +05:30
Bruce Momjian 5ad46aec87 doc: improve wording of plpgsql RAISE format text
Reported-by: pg@kirasoft.com

Discussion: https://postgr.es/m/165455351426.573551.7050474465030525109@wrigleys.postgresql.org

Backpatch-through: 10
2022-06-22 16:59:53 -04:00
Bruce Momjian c08b3e9413 doc: clarify wording about phantom reads
Reported-by: akhilhello@gmail.com

Discussion: https://postgr.es/m/165222922369.669.10475917322916060899@wrigleys.postgresql.org

Backpatch-through: 10
2022-06-22 14:33:38 -04:00
Tom Lane 293f5c5f49 Fix SPI's handling of errors during transaction commit.
SPI_commit previously left it up to the caller to recover from any error
occurring during commit.  Since that's complicated and requires use of
low-level xact.c facilities, it's not too surprising that no caller got
it right.  Let's move the responsibility for cleanup into spi.c.  Doing
that requires redefining SPI_commit as starting a new transaction, so
that it becomes equivalent to SPI_commit_and_chain except that you get
default transaction characteristics instead of preserving the prior
transaction's characteristics.  We can make this pretty transparent
API-wise by redefining SPI_start_transaction() as a no-op.  Callers
that expect to do something in between might be surprised, but
available evidence is that no callers do so.

Having made that API redefinition, we can fix this mess by having
SPI_commit[_and_chain] trap errors and start a new, clean transaction
before re-throwing the error.  Likewise for SPI_rollback[_and_chain].
Some cleanup is also needed in AtEOXact_SPI, which was nowhere near
smart enough to deal with SPI contexts nested inside a committing
context.

While plperl and pltcl need no changes beyond removing their now-useless
SPI_start_transaction() calls, plpython needs some more work because it
hadn't gotten the memo about catching commit/rollback errors in the
first place.  Such an error resulted in longjmp'ing out of the Python
interpreter, which leaks Python stack entries at present and is reported
to crash Python 3.11 altogether.  Add the missing logic to catch such
errors and convert them into Python exceptions.

This is a back-patch of commit 2e517818f.  That's now aged long enough
to reduce the concerns about whether it will break something, and we
do need to ensure that supported branches will work with Python 3.11.

Peter Eisentraut and Tom Lane

Discussion: https://postgr.es/m/3375ffd8-d71c-2565-e348-a597d6e739e3@enterprisedb.com
Discussion: https://postgr.es/m/17416-ed8fe5d7213d6c25@postgresql.org
2022-06-22 12:12:00 -04:00
Tom Lane 9a3aab0f2a Avoid ecpglib core dump with out-of-order operations.
If an application executed operations like EXEC SQL PREPARE
without having first established a database connection, it could
get a core dump instead of the expected clean failure.  This
occurred because we did "pthread_getspecific(actual_connection_key)"
without ever having initialized the TSD key actual_connection_key.
The results of that are probably platform-specific, but at least
on Linux it often leads to a crash.

To fix, add calls to ecpg_pthreads_init() in the code paths that
might use actual_connection_key uninitialized.  It's harmless
(and hopefully inexpensive) to do that more than once.

Per bug #17514 from Okano Naoki.  The problem's ancient, so
back-patch to all supported branches.

Discussion: https://postgr.es/m/17514-edd4fad547c5692c@postgresql.org
2022-06-14 18:16:46 -04:00
Tom Lane cc5de7ba25 Doc: clarify the default collation behavior of domains.
The previous wording was "the underlying data type's default collation
is used", which is wrong or at least misleading.  The domain inherits
the base type's collation behavior, which if "default" actually can
mean that we use some non-default collation obtained from elsewhere.

Per complaint from Jian He.

Discussion: https://postgr.es/m/CACJufxHMR8_4WooDPjjvEdaxB2hQ5a49qthci8fpKP0MKemVRQ@mail.gmail.com
2022-06-14 17:47:09 -04:00
Tom Lane 030da9b6fd Revert "Fix psql's single transaction mode on client-side errors with -c/-f switches".
This reverts commits a04ccf6df et al. in the back branches only.
There was some disagreement already over whether to back-patch
157f8739a, on the grounds that it is the sort of behavioral
change that we don't like to back-patch.  Furthermore, it now
looks like the logic needs some more work, which we don't have
time for before the upcoming 14.4 release.  Revert for now, and
perhaps reconsider later.

Discussion: https://postgr.es/m/17504-76b68018e130415e@postgresql.org
2022-06-10 16:34:25 -04:00
Tom Lane d3ef5c3ef4 Un-break whole-row Vars referencing domain-over-composite types.
In commit ec62cb0aa, I foolishly replaced ExecEvalWholeRowVar's
lookup_rowtype_tupdesc_domain call with just lookup_rowtype_tupdesc,
because I didn't see how a domain could be involved there, and
there were no regression test cases to jog my memory.  But the
existing code was correct, so revert that change and add a test
case showing why it's necessary.  (Note: per comment in struct
DatumTupleFields, it is correct to produce an output tuple that's
labeled with the base composite type, not the domain; hence just
blindly looking through the domain is correct here.)

Per bug #17515 from Dan Kubb.  Back-patch to v11 where domains over
composites became a thing.

Discussion: https://postgr.es/m/17515-a24737438363aca0@postgresql.org
2022-06-10 10:35:57 -04:00
Tom Lane 51b0198d2a Doc: copy-edit "jsonb Indexing" section.
The patch introducing jsonpath dropped a para about that between
two related examples, and didn't bother updating the introductory
sentences that it falsified.  The grammar was pretty shaky as well.
2022-06-08 12:01:51 -04:00
Peter Eisentraut 9b100eeb84 Fix whitespace 2022-06-08 13:42:18 +02:00
Tom Lane 435251b859 Fix off-by-one loop termination condition in pg_stat_get_subscription().
pg_stat_get_subscription scanned one more LogicalRepWorker array entry
than is really allocated.  In the worst case this could lead to SIGSEGV,
if the LogicalRepCtx data structure is near the end of shared memory.
That seems quite unlikely though (thanks to the ordering of calls in
CreateSharedMemoryAndSemaphores) and we've heard no field reports of it.
A more likely misbehavior is one row of garbage data in the function's
result, but even that is not real likely because of the check that the
pid field matches some live backend.

Report and fix by Kuntal Ghosh.  This bug is old, so back-patch
to all supported branches.

Discussion: https://postgr.es/m/CAGz5QCJykEDzW6jQK6Yz7Qh_PMtD=95de_7QoocbVR2Qy8hWZA@mail.gmail.com
2022-06-07 15:34:30 -04:00
Tom Lane 02026cadbf Don't fail on libpq-generated error reports in ecpg_raise_backend().
An error PGresult generated by libpq itself, such as a report of
connection loss, won't have broken-down error fields.
ecpg_raise_backend() blithely assumed that PG_DIAG_MESSAGE_PRIMARY
would always be present, and would end up passing a NULL string
pointer to snprintf when it isn't.  That would typically crash
before 3779ac62d, and it would fail to provide a useful error report
in any case.  Best practice is to substitute PQerrorMessage(conn)
in such cases, so do that.

Per bug #17421 from Masayuki Hirose.  Back-patch to all supported
branches.

Discussion: https://postgr.es/m/17421-790ff887e3188874@postgresql.org
2022-06-06 11:20:41 -04:00
Michael Paquier 0a1e4f0ca7 Fix psql's single transaction mode on client-side errors with -c/-f switches
psql --single-transaction is able to handle multiple -c and -f switches
in a single transaction since d5563d7d, but this had the surprising
behavior of forcing a transaction COMMIT even if psql failed with an
error in the client (for example incorrect path given to \copy), which
would generate an error, but still commit any changes that were already
applied in the backend.  This commit makes the behavior more consistent,
by enforcing a transaction ROLLBACK if any commands fail, both
client-side and backend-side, so as no changes are applied if one error
happens in any of them.

Some tests are added on HEAD to provide some coverage about all that.
Backend-side errors are unreliable as IPC::Run can complain on SIGPIPE
if psql quits before reading a query result, but that should work
properly in the case where any errors come from psql itself, which is
what the original report is about.

Reported-by: Christoph Berg
Author: Kyotaro Horiguchi, Michael Paquier
Discussion: https://postgr.es/m/17504-76b68018e130415e@postgresql.org
Backpatch-through: 10
2022-06-06 11:07:31 +09:00
Tom Lane 34875f38b1 Doc: fix incorrect bit-reversal in example of macaddr formatting.
Will Mortensen (minor additional copy-editing by me)

Discussion: https://postgr.es/m/CAMpnoC5Y6jiZHSA82FG+e_AqkwMg-i94EYqs1C_9kXXFc3_3Yw@mail.gmail.com
2022-06-03 11:52:07 -04:00
Etsuro Fujita dadee87539 Doc: Further fix CREATE FOREIGN TABLE synopsis.
This patch fixes the partitioning synopsis in the Parameters section in
the CREATE FOREIGN TABLE documentation.  Follow-up for commit ce21a36cf.

Back-patch to v11 where default partition was introduced.

Reviewed by Amit Langote and Robert Haas.

Discussion: https://postgr.es/m/CAPmGK17U5jEqVZuo3r38wB0VFWomEtJCBGn_h92HQzQ2sP-49Q%40mail.gmail.com
2022-06-02 18:00:05 +09:00
Tom Lane dd672be38d Silence compiler warnings from some older compilers.
Since a117cebd6, some older gcc versions issue "variable may be used
uninitialized in this function" complaints for brin_summarize_range.
Silence that using the same coding pattern as in bt_index_check_internal;
arguably, a117cebd6 had too narrow a view of which compilers might give
trouble.

Nathan Bossart and Tom Lane.  Back-patch as the previous commit was.

Discussion: https://postgr.es/m/20220601163537.GA2331988@nathanxps13
2022-06-01 17:21:45 -04:00
Tom Lane c085387345 Fix pl/perl test case so it will still work under Perl 5.36.
Perl 5.36 has reclassified the warning condition that this test
case used, so that the expected error fails to appear.  Tweak
the test so it instead exercises a case that's handled the same
way in all Perl versions of interest.

This appears to meet our standards for back-patching into
out-of-support branches: it changes no user-visible behavior
but enables testing of old branches with newer tools.
Hence, back-patch as far as 9.2.

Dagfinn Ilmari Mannsåker, per report from Jitka Plesníková.

Discussion: https://postgr.es/m/564579.1654093326@sss.pgh.pa.us
2022-06-01 16:15:47 -04:00
David Rowley 9ae467db92 Doc: mention limitation of the number of resultset columns
The PostgreSQL limitations section of the documents mentioned the limit
on the number of columns that can exist in a table.  Users might be
surprised to find that there's also a limit on the number of columns that
can exist in a targetlist.  Users may experience restrictions which
surprise them if they happened to select a large number of columns from
several tables with many columns.  Here we document that there is a
limitation on this and mention what that limit actually is.

Wording proposal by Alvaro Herrera

Reported-by: Vladimir Sitnikov
Author: Dave Crammer
Reviewed-by: Tom Lane
Discussion: https://postgr.es/m/CAB=Je-E18aTYpNqje4mT0iEADpeGLSzwUvo3H9kRRuDdsNo4aQ@mail.gmail.com
Backpatch-through: 12, where the limitations section was added
2022-06-01 12:47:27 +12:00
Tom Lane a3faebd6a5 Ensure ParseTzFile() closes the input file after failing.
We hadn't noticed this because (a) few people feed invalid
timezone abbreviation files to the server, and (b) in typical
scenarios guc.c would throw ereport(ERROR) and then transaction
abort handling would silently clean up the leaked file reference.
However, it was possible to observe file leakage warnings if one
breaks an already-active abbreviation file, because guc.c does
not throw ERROR when loading supposedly-validated settings during
session start or SIGHUP processing.

Report and fix by Kyotaro Horiguchi (cosmetic adjustments by me)

Discussion: https://postgr.es/m/20220530.173740.748502979257582392.horikyota.ntt@gmail.com
2022-05-31 14:47:44 -04:00
Tom Lane fa70c9e021 Doc: fix mention of pg_dump's minimum supported server version.
runtime.sgml contains a passing reference to the minimum server
version that pg_dump[all] can dump from.  That was 7.0 for many
years, but when 64f3524e2 raised it to 8.0, we missed updating this
bit.  Then when 30e7c175b raised it to 9.2, we missed it again.

Given that track record, I'm not too hopeful that we'll remember
to fix this in future changes ... but for now, make the docs match
reality in each branch.

Noted by Daniel Westermann.

Discussion: https://postgr.es/m/GV0P278MB041917EB3E2FE8704B5AE2C6D2DC9@GV0P278MB0419.CHEP278.PROD.OUTLOOK.COM
2022-05-31 12:14:02 -04:00
Michael Paquier bc2f04e4f2 doc: Reword description of roles able to view track_activities's info
The information generated when track_activities is accessible to
superusers, roles with the privileges of pg_read_all_stats, as well as
roles one has the privileges of.  The original text did not outline the
last point, while the change done in ac1ae47 was unclear about the
second point.

Per discussion with Nathan Bossart.

Discussion: https://postgr.es/m/20220521185743.GA886636@nathanxps13
Backpatch-through: 10
2022-05-30 10:50:44 +09:00
Michael Paquier ae236bf660 Handle NULL for short descriptions of custom GUC variables
If a short description is specified as NULL in one of the various
DefineCustomXXXVariable() functions available to external modules to
define a custom parameter, SHOW ALL would crash.  This change teaches
SHOW ALL to properly handle NULL short descriptions, as well as any code
paths that manipulate it, to gain in flexibility.  Note that
help_config.c was already able to do that, when describing a set of GUCs
for postgres --describe-config.

Author: Steve Chavez
Reviewed by: Nathan Bossart, Andres Freund, Michael Paquier, Tom Lane
Discussion: https://postgr.es/m/CAGRrpzY6hO-Kmykna_XvsTv8P2DshGiU6G3j8yGao4mk0CqjHA%40mail.gmail.com
Backpatch-through: 10
2022-05-28 12:12:55 +09:00
Tom Lane 01ab9fb7de Remove misguided SSL key file ownership check in libpq.
Commits a59c79564 et al. tried to sync libpq's SSL key file
permissions checks with what we've used for years in the backend.
We did not intend to create any new failure cases, but it turns out
we did: restricting the key file's ownership breaks cases where the
client is allowed to read a key file despite not having the identical
UID.  In particular a client running as root used to be able to read
someone else's key file; and having seen that I suspect that there are
other, less-dubious use cases that this restriction breaks on some
platforms.

We don't really need an ownership check, since if we can read the key
file despite its having restricted permissions, it must have the right
ownership --- under normal conditions anyway, and the point of this
patch is that any additional corner cases where that works should be
deemed allowable, as they have been historically.  Hence, just drop
the ownership check, and rearrange the permissions check to get rid
of its faulty assumption that geteuid() can't be zero.  (Note that the
comparable backend-side code doesn't have to cater for geteuid() == 0,
since the server rejects that very early on.)

This does have the end result that the permissions safety check used
for a root user's private key file is weaker than that used for
anyone else's.  While odd, root really ought to know what she's doing
with file permissions, so I think this is acceptable.

Per report from Yogendra Suralkar.  Like the previous patch,
back-patch to all supported branches.

Discussion: https://postgr.es/m/MW3PR15MB3931DF96896DC36D21AFD47CA3D39@MW3PR15MB3931.namprd15.prod.outlook.com
2022-05-26 14:14:05 -04:00
Robert Haas 4368ef2189 In CREATE FOREIGN TABLE syntax synopsis, fix partitioning stuff.
Foreign tables can be partitioned, but previous documentation commits
left the syntax synopsis both incomplete and incorrect.

Justin Pryzby and Amit Langote

Discussion: http://postgr.es/m/20220521130922.GX19626@telsasoft.com
2022-05-26 12:55:02 -04:00
Tom Lane bb2c04676b Show 'AS "?column?"' explicitly when it's important.
ruleutils.c was coded to suppress the AS label for a SELECT output
expression if the column name is "?column?", which is the parser's
fallback if it can't think of something better.  This is fine, and
avoids ugly clutter, so long as (1) nothing further up in the parse
tree relies on that column name or (2) the same fallback would be
assigned when the rule or view definition is reloaded.  Unfortunately
(2) is far from certain, both because ruleutils.c might print the
expression in a different form from how it was originally written
and because FigureColname's rules might change in future releases.
So we shouldn't rely on that.

Detecting exactly whether there is any outer-level use of a SELECT
column name would be rather expensive.  This patch takes the simpler
approach of just passing down a flag indicating whether there *could*
be any outer use; for example, the output column names of a SubLink
are not referenceable, and we also do not care about the names exposed
by the right-hand side of a setop.  This is sufficient to suppress
unwanted clutter in all but one case in the regression tests.  That
seems like reasonable evidence that it won't be too much in users'
faces, while still fixing the cases we need to fix.

Per bug #17486 from Nicolas Lutic.  This issue is ancient, so
back-patch to all supported branches.

Discussion: https://postgr.es/m/17486-1ad6fd786728b8af@postgresql.org
2022-05-21 14:45:58 -04:00
Michael Paquier 5f6baeea98 doc: Mention pg_read_all_stats in description of track_activities
The description of track_activities mentioned that it is visible to
superusers and that the information related to the current session can
be seen, without telling about pg_read_all_stats.  Roles that are
granted the privileges of pg_read_all_stats can also see this
information, so mention it in the docs.

Author: Ian Barwick
Reviewed-by: Nathan Bossart
Discussion: https://postgr.es/m/CAB8KJ=jhPyYFu-A5r-ZGP+Ax715mUKsMxAGcEQ9Cx_mBAmrPow@mail.gmail.com
Backpatch-through: 10
2022-05-21 19:06:07 +09:00
Alvaro Herrera 4492e73a66
Fix DDL deparse of CREATE OPERATOR CLASS
When an implicit operator family is created, it wasn't getting reported.
Make it do so.

This has always been missing.  Backpatch to 10.

Author: Masahiko Sawada <sawada.mshk@gmail.com>
Reported-by: Leslie LEMAIRE <leslie.lemaire@developpement-durable.gouv.fr>
Reviewed-by: Amit Kapila <amit.kapila16@gmail.com>
Reviewed-by: Michael Paquiër <michael@paquier.xyz>
Discussion: https://postgr.es/m/f74d69e151b22171e8829551b1159e77@developpement-durable.gouv.fr
2022-05-20 18:52:55 +02:00