Commit d7f8d26d9 added new tests to the stats_ext regression test that
included creating a view in the public schema, without realising that
the stats_ext test runs in the same parallel group as the rules test,
which makes doing that unsafe.
This led to intermittent failures of the rules test on the buildfarm,
although I wasn't able to reproduce that locally. Fix by creating the
view in a different schema.
Tomas Vondra and Dean Rasheed, report and diagnosis by Thomas Munro.
Discussion: https://postgr.es/m/CA+hUKGKX9hFZrYA7rQzAMRE07L4hziCc-nO_b3taJpiuKyLLxg@mail.gmail.com
Since WITH CHECK OPTION was introduced, ExecInitModifyTable has
initialized WCO expressions with the wrong plan node as parent -- that is,
it passed its input subplan not the ModifyTable node itself. Up to now
we thought this was harmless, but bug #16006 from Vinay Banakar shows it's
not: if the input node is a SubqueryScan then ExecInitWholeRowVar can get
confused into doing the wrong thing. (The fact that ExecInitWholeRowVar
contains such logic is certainly a horrid kluge that doesn't deserve to
live, but figuring out another way to do that is a task for some other day.)
Andres had already noticed the wrong-parent mistake and fixed it in commit
148e632c0, but not being aware of any user-visible consequences, he quite
reasonably didn't back-patch. This patch is simply a back-patch of
148e632c0, plus addition of a test case based on bug #16006. I also added
the test case to v12/HEAD, even though the bug is already fixed there.
Back-patch to all supported branches. 9.4 lacks RLS policies so the
new test case doesn't work there, but I'm pretty sure a test could be
devised based on using a whole-row Var in a plain WITH CHECK OPTION
condition. (I lack the cycles to do so myself, though.)
Andres Freund and Tom Lane
Discussion: https://postgr.es/m/16006-99290d2e4642cbd5@postgresql.org
Discussion: https://postgr.es/m/20181205225213.hiwa3kgoxeybqcqv@alap3.anarazel.de
This adds tests to cover more code paths to ignore backslash commands in
false branches when using \if|\elif|\else, and improves the coverage of
\elif.
Author: Fabien Coelho
Discussion: https://postgr.es/m/alpine.DEB.2.21.1908281618520.28828@lancre
When building statistics, we need to decide how many rows to sample and
how accurate the resulting statistics should be. Until now, it was not
possible to explicitly define statistics target for extended statistics
objects, the value was always computed from the per-attribute targets
with a fallback to the system-wide default statistics target.
That's a bit inconvenient, as it ties together the statistics target set
for per-column and extended statistics. In some cases it may be useful
to require larger sample / higher accuracy for extended statics (or the
other way around), but with this approach that's not possible.
So this commit introduces a new command, allowing to specify statistics
target for individual extended statistics objects, overriding the value
derived from per-attribute targets (and the system default).
ALTER STATISTICS stat_name SET STATISTICS target_value;
When determining statistics target for an extended statistics object we
first look at this explicitly set value. When this value is -1, we fall
back to the old formula, looking at the per-attribute targets first and
then the system default. This means the behavior is backwards compatible
with older PostgreSQL releases.
Author: Tomas Vondra
Discussion: https://postgr.es/m/20190618213357.vli3i23vpkset2xd@development
Reviewed-by: Kirk Jamison, Dean Rasheed
Don't just assume that the next port is free; it might not be, or
if we're really unlucky it might even be out of the TCP range.
Do it honestly with two get_free_port() calls instead.
This is surely a pretty low-probability problem, but I think it
explains a buildfarm failure seen today, so let's fix it.
Back-patch to v11 where this script was added.
Discussion: https://postgr.es/m/25124.1568052346@sss.pgh.pa.us
In ad0bda5d24ea I changed the EvalPlanQual machinery to store
substitution tuples in slot, instead of using plain HeapTuples. The
main motivation for that was that using HeapTuples will be inefficient
for future tableams. But it turns out that that conversion was buggy
for non-locking rowmarks - the wrong tuple descriptor was used to
create the slot.
As a secondary issue 5db6df0c0 changed ExecLockRows() to begin EPQ
earlier, to allow to fetch the locked rows directly into the EPQ
slots, instead of having to copy tuples around. Unfortunately, as Tom
complained, that forces some expensive initialization to happen
earlier.
As a third issue, the test coverage for EPQ was clearly insufficient.
Fixing the first issue is unfortunately not trivial: Non-locked row
marks were fetched at the start of EPQ, and we don't have the type
information for the rowmarks available at that point. While we could
change that, it's not easy. It might be worthwhile to change that at
some point, but to fix this bug, it seems better to delay fetching
non-locking rowmarks when they're actually needed, rather than
eagerly. They're referenced at most once, and in cases where EPQ
fails, might never be referenced. Fetching them when needed also
increases locality a bit.
To be able to fetch rowmarks during execution, rather than
initialization, we need to be able to access the active EPQState, as
that contains necessary data. To do so move EPQ related data from
EState to EPQState, and, only for EStates creates as part of EPQ,
reference the associated EPQState from EState.
To fix the second issue, change EPQ initialization to allow use of
EvalPlanQualSlot() to be used before EvalPlanQualBegin() (but
obviously still requiring EvalPlanQualInit() to have been done).
As these changes made struct EState harder to understand, e.g. by
adding multiple EStates, significantly reorder the members, and add a
lot more comments.
Also add a few more EPQ tests, including one that fails for the first
issue above. More is needed.
Reported-By: yi huang
Author: Andres Freund
Reviewed-By: Tom Lane
Discussion:
https://postgr.es/m/CAHU7rYZo_C4ULsAx_LAj8az9zqgrD8WDd4hTegDTMM1LMqrBsg@mail.gmail.comhttps://postgr.es/m/24530.1562686693@sss.pgh.pa.us
Backpatch: 12-, where the EPQ changes were introduced
In order to implement NULL LAST semantic GiST previously assumed distance to
the NULL value to be Inf. However, our distance functions can return Inf and
NaN for non-null values. In such cases, NULL LAST semantic appears to be
broken. This commit fixes that by introducing separate array of null flags for
distances.
Backpatch to all supported versions.
Discussion: https://postgr.es/m/CAPpHfdsNvNdA0DBS%2BwMpFrgwT6C3-q50sFVGLSiuWnV3FqOJuQ%40mail.gmail.com
Author: Alexander Korotkov
Backpatch-through: 9.4
Previously plain float comparison was used in GiST pairing heap. Such
comparison doesn't provide proper ordering for value sets containing Inf and Nan
values. This commit fixes that by usage of float8_cmp_internal(). Note, there
is remaining problem with NULL distances, which are represented as Inf in
pairing heap. It would be fixes in subsequent commit.
Backpatch to all supported versions.
Reported-by: Andrey Borodin
Discussion: https://postgr.es/m/CAPpHfdsNvNdA0DBS%2BwMpFrgwT6C3-q50sFVGLSiuWnV3FqOJuQ%40mail.gmail.com
Author: Alexander Korotkov
Reviewed-by: Heikki Linnakangas
Backpatch-through: 9.4
When using COMMIT AND CHAIN or ROLLBACK AND CHAIN not in an explicit
transaction block, the previous implementation would leave a
transaction block active in the ROLLBACK case but not the COMMIT case.
To fix for now, error out when using these commands not in an explicit
transaction block. This restriction could be lifted if a sensible
definition and implementation is found.
Bug: #15977
Author: fn ln <emuser20140816@gmail.com>
Reviewed-by: Fabien COELHO <coelho@cri.ensmp.fr>
Commit 6f6b99d13 stuck an INFO message into the fast path for
checking partition constraints, for no very good reason except
that it made it easy for the regression tests to verify that
that path was taken. Assorted later patches did likewise,
increasing the unsuppressable-chatter level from ALTER TABLE
even more. This isn't good for the user experience, so let's
drop these messages down to DEBUG1 where they belong. So as
not to have a loss of test coverage, create a TAP test that
runs the relevant queries with client_min_messages = DEBUG1
and greps for the expected messages.
This testing method is a bit brute-force --- in particular,
it duplicates the execution of a fair amount of the core
create_table and alter_table tests. We experimented with
other solutions, but running any significant amount of
standard testing with client_min_messages = DEBUG1 seems
to have a lot of output-stability pitfalls, cf commits
bbb96c370 and 5655565c0. Possibly at some point we'll look
into whether we can reduce the amount of test duplication.
Backpatch into v12, because some of these messages are new
in v12 and we don't really want to ship it that way.
Sergei Kornilov
Discussion: https://postgr.es/m/81911511895540@web58j.yandex.ru
Discussion: https://postgr.es/m/4859321552643736@myt5-02b80404fd9e.qloud-c.yandex.net
As a result of some long-ago quick hacks, the SIMILAR TO operator
and the corresponding flavor of substring() interpreted "ESCAPE NULL"
as selecting the default escape character '\'. This is both
surprising and not per spec: the standard is clear that these
functions should return NULL for NULL input.
Additionally, because of inconsistency of the strictness markings
of 3-argument substring() and similar_escape(), the planner could not
inline the SQL definition of substring(), resulting in a substantial
performance penalty compared to the underlying POSIX substring()
function.
The simplest fix for this would be to change the strictness marking
of similar_escape(), but if we do that we risk breaking existing views
that depend on that function. Hence, leave similar_escape() as-is
as a compatibility function, and instead invent a new function
similar_to_escape() that comes in two strict variants.
There are a couple of other behaviors in this area that are also
not per spec, but they are documented and seem generally at least
as sane as the spec's definition, so leave them alone. But improve
the documentation to describe them fully.
Patch by me; thanks to Álvaro Herrera and Andrew Gierth for review
and discussion.
Discussion: https://postgr.es/m/14047.1557708214@sss.pgh.pa.us
The test for SysV support currently involves looking for the perl
modules IPC::SharedMem and IPC::SysV. However, the perl on msys2 has
these modules but the tests fail. Therefore, force skipping the tests on
Windows platforms unconditionally.
Discussion: https://postgr.es/m/176e86ba-1a46-9d8c-5ae4-9865a463b411@2ndQuadrant.com
This approach provides a much tighter binding between a data directory
and the associated SysV shared memory block (and SysV or named-POSIX
semaphores, if we're using those). Key collisions are still possible,
but only between data directories stored on different filesystems,
so the situation should be negligible in practice. More importantly,
restarting the postmaster with a different port number no longer
risks failing to identify a relevant shared memory block, even when
postmaster.pid has been removed. A standalone backend is likewise
much more certain to detect conflicting leftover backends.
(In the longer term, we might now think about deprecating the port as
a cluster-wide value, so that one postmaster could support sockets
with varying port numbers. But that's for another day.)
The hazards fixed here apply only on Unix systems; our Windows code
paths already use identifiers derived from the data directory path
name rather than the port.
src/test/recovery/t/017_shm.pl, which intends to test key-collision
cases, has been substantially rewritten since it can no longer use
two postmasters with identical port numbers to trigger the case.
Instead, use Perl's IPC::SharedMem module to create a conflicting
shmem segment directly. The test script will be skipped if that
module is not available. (This means that some older buildfarm
members won't run it, but I don't think that that results in any
meaningful coverage loss.)
Patch by me; thanks to Noah Misch and Peter Eisentraut for discussion
and review.
Discussion: https://postgr.es/m/16908.1557521200@sss.pgh.pa.us
detoast.c/h contain functions required to detoast a datum, partially
or completely, plus a few other utility functions for examining the
size of toasted datums.
toast_internals.c/h contain functions that are used internally to the
TOAST subsystem but which (mostly) do not need to be accessed from
outside.
heaptoast.c/h contains code that is intrinsically specific to the
heap AM, either because it operates on HeapTuples or is based on the
layout of a heap page.
detoast.c and toast_internals.c are placed in
src/backend/access/common rather than src/backend/access/heap. At
present, both files still have dependencies on the heap, but that will
be improved in a future commit.
Patch by me, reviewed and tested by Prabhat Sabu, Thomas Munro,
Andres Freund, and Álvaro Herrera.
Discussion: http://postgr.es/m/CA+TgmoZv-=2iWM4jcw5ZhJeL18HF96+W1yJeYrnGMYdkFFnEpQ@mail.gmail.com
The comment did not match what the code actually did for integers with
the 43rd bit set. You get an integer like that, if you have a posting
list with two adjacent TIDs that are more than 2^31 blocks apart.
According to the comment, we would store that in 6 bytes, with no
continuation bit on the 6th byte, but in reality, the code encodes it
using 7 bytes, with a continuation bit on the 6th byte as normal.
The decoding routine also handled these 7-byte integers correctly, except
for an overflow check that assumed that one integer needs at most 6 bytes.
Fix the overflow check, and fix the comment to match what the code
actually does. Also fix the comment that claimed that there are 17 unused
bits in the 64-bit representation of an item pointer. In reality, there
are 64-32-11=21.
Fitting any item pointer into max 6 bytes was an important property when
this was written, because in the old pre-9.4 format, item pointers were
stored as plain arrays, with 6 bytes for every item pointer. The maximum
of 6 bytes per integer in the new format guaranteed that we could convert
any page from the old format to the new format after upgrade, so that the
new format was never larger than the old format. But we hardly need to
worry about that anymore, and running into that problem during upgrade,
where an item pointer is expanded from 6 to 7 bytes such that the data
doesn't fit on a page anymore, is implausible in practice anyway.
Backpatch to all supported versions.
This also includes a little test module to test these large distances
between item pointers, without requiring a 16 TB table. It is not
backpatched, I'm including it more for the benefit of future development
of new posting list formats.
Discussion: https://www.postgresql.org/message-id/33bfc20a-5c86-f50c-f5a5-58e9925d05ff%40iki.fi
Reviewed-by: Masahiko Sawada, Alexander Korotkov
check_float4_val() checks after underflow and overflow of values
converted from float8 to float4, but there has never been any regression
tests for that. This brings the coverage of float.h to 100%.
Author: Movead Li
Discussion: https://postgr.es/m/20190822174636998766188@highgo.ca
Commit a4327296d taught pg_regress proper to do this, but
missed the opportunity to do likewise in the isolationtester
and ecpg variants of pg_regress. Seems like this might be
helpful for tracking down issues exposed by those tests.
If a test case tried to set an invalid value of synchronous_standby_names,
the test script didn't detect that, which seems like a bad idea.
Noticed while testing a proposed patch that broke some of these
test cases.
We were setting extra_float_digits = 0 to avoid platform-dependent
output in this test, but that's still able to expose platform-specific
roundoff behavior in some new test cases added by commit a3d284485,
as reported by Peter Eisentraut. Reduce it to -1 to hide that.
(Over in geometry.sql, we're using -3, which is an ancient decision
dating to 337f73b1b. I wonder whether that's overkill now. But
there's probably little value in trying to change it.)
Back-patch to v12 where a3d284485 came in; there's no evidence that
we have any platform-dependent issues here before that.
Discussion: https://postgr.es/m/15551268-e224-aa46-084a-124b64095ee3@2ndquadrant.com
This is useful for developers to find out if an isolation spec is
over-engineered or if it needs more work by warning at the end of a
test run if a step is not used, generating a failure with extra diffs.
While on it, clean up all the specs which include steps not used in any
permutations to simplify them.
Author: Michael Paquier
Reviewed-by: Asim Praveen, Melanie Plageman
Discussion: https://postgr.es/m/20190819080820.GG18166@paquier.xyz
The original purpose of the dry-run mode is to be able to print all the
possible permutations from a spec file, but it has become less useful
since isolation tests has improved regarding deadlock detection as one
step not wanted by the author could block indefinitely now (originally
the step blocked would have been detected rather quickly). Per
discussion, let's remove it.
Author: Michael Paquier
Reviewed-by: Asim Praveen, Melanie Plageman
Discussion: https://postgr.es/m/20190819080820.GG18166@paquier.xyz
Using pg_pltemplate as test data was probably not very forward-looking,
considering we've had many discussions around removing that catalog
altogether. Use a nearby temp table instead, to make these two test
scripts more self-contained. This is a better test case anyway, since
it exercises the scenario where the entries in the anyarray column
actually vary in type intra-query.
If the record argument is NULL and has no declared type more concrete
than RECORD, we can't extract useful information about the desired
rowtype from it. In this case, see if we're in FROM with an AS clause,
and if so extract the needed rowtype info from AS.
It worked like this before v11, but commit 37a795a60 removed the
behavior, reasoning that it was undocumented, inefficient, and utterly
not self-consistent. If you want to take type info from an AS clause,
you should be using the json_to_record() family of functions not the
json_populate_record() family. Also, it was already the case that
the "populate" functions would fail for a null-valued RECORD input
(with an unfriendly "record type has not been registered" error)
when there wasn't an AS clause at hand, and it wasn't obvious that
that behavior wasn't OK when there was one. However, it emerges
that some people were depending on this to work, and indeed the
rather off-point error message you got if you left off AS encouraged
slapping on AS without switching to the json_to_record() family.
Hence, put back the fallback behavior of looking for AS. While at it,
improve the run-time error you get when there's no place to obtain type
info; we can do a lot better than "record type has not been registered".
(We can't, unfortunately, easily improve the parse-time error message
that leads people down this path in the first place.)
While at it, I refactored the code a bit to avoid duplicating the
same logic in several different places.
Per bug #15940 from Jaroslav Sivy. Back-patch to v11 where the
current coding came in. (The pre-v11 deficiencies in this area
aren't regressions, so we'll leave those branches alone.)
Patch by me, based on preliminary analysis by Dmitry Dolgov.
Discussion: https://postgr.es/m/15940-2ab76dc58ffb85b6@postgresql.org
If a table inherits from multiple unrelated parents, we must disallow
changing the type of a column inherited from multiple such parents, else
it would be out of step with the other parents. However, it's possible
for the column to ultimately be inherited from just one common ancestor,
in which case a change starting from that ancestor should still be
allowed. (I would not be excited about preserving that option, were
it not that we have regression test cases exercising it already ...)
It's slightly annoying that this patch looks different from the logic
with the same end goal in renameatt(), and more annoying that it
requires an extra syscache lookup to make the test. However, the
recursion logic is quite different in the two functions, and a
back-patched bug fix is no place to be trying to unify them.
Per report from Manuel Rigger. Back-patch to 9.5. The bug exists in
9.4 too (and doubtless much further back); but the way the recursion
is done in 9.4 is a good bit different, so that substantial refactoring
would be needed to fix it in 9.4. I'm disinclined to do that, or risk
introducing new bugs, for a bug that has escaped notice for this long.
Discussion: https://postgr.es/m/CA+u7OA4qogDv9rz1HAb-ADxttXYPqQdUdPY_yd4kCzywNxRQXA@mail.gmail.com
This test failed fairly reproducibly on some CLOBBER_CACHE_ALWAYS
buildfarm animals. The cause seems to be that if a parallel worker
is slow enough to reach its lock wait, it may not be released by
the first deadlock check run, and then later deadlock checks might
decide to unblock the d2 session instead of the d1 session, leaving
us in an undetected deadlock state (since the isolationtester client
is waiting for d1 to complete first).
Fix by introducing an additional lock wait at the end of the d2a1
step, ensuring that the deadlock checker will recognize that d1
has to be unblocked before d2a1 completes.
Also reduce max_parallel_workers_per_gather to 3 in this test. With the
default max_worker_processes value, we were only getting one parallel
worker for the d2a1 step, which is not the case I hoped to test. We
should get 3 for d1a2 and 2 for d2a1, as the code stands; and maybe 3
for d2a1 if somebody figures out why the last parallel worker slot isn't
free already.
Discussion: https://postgr.es/m/22195.1566077308@sss.pgh.pa.us
This is a variant of the problem fixed in commit 25b692568, which
unfortunately we failed to detect at the time. If an update trigger
returns the "old" tuple, as it's entitled to do, then a subsequent
iteration of the loop in ExecBRUpdateTriggers would have "oldtuple"
equal to "trigtuple" and would fail to notice that it shouldn't
free that.
In addition to fixing the code, extend the test case added by
25b692568 so that it covers multiple-trigger-iterations cases.
This problem does not manifest in v12/HEAD, as a result of the
relevant code having been largely rewritten for slotification.
However, include the test case into v12/HEAD anyway, since this
is clearly an area that someone could break again in future.
Per report from Piotr Gabriel Kosinski. Back-patch into all
supported branches, since the bug seems quite old.
Diagnosis and code fix by Thomas Munro, test case by me.
Discussion: https://postgr.es/m/CAFMLSdP0rd7LqC3j-H6Fh51FYSt5A10DDh-3=W4PPc4LLUQ8YQ@mail.gmail.com
Previously, async.c got rid of duplicate notifications by scanning
the list of pending events to compare each one to the proposed new
event. This works okay for very small numbers of distinct events,
but degrades as O(N^2) for many events. We can improve matters by
using a hash table to probe for duplicates. So as not to add a
lot of overhead for the simple cases that the code did handle well
before, create the hash table only once a (sub)transaction has
queued more than 16 distinct notify events.
A downside is that we now have to do per-event work to propagate
a successful subtransaction's notify events up to its parent.
(But this isn't significant unless the subtransaction had many
events, in which case the O(N^2) behavior would have been in
play already, so we still come out ahead.)
We can make some lemonade out of this lemon, though: since we must
examine each event anyway, it's now possible to de-duplicate events
fully, rather than skipping that for events merged up from
subtransactions. Hence, remove the old weasel wording in notify.sgml
about whether de-duplication happens or not, and adjust the test
case in async-notify.spec that exhibited the old behavior.
While at it, rearrange the definition of struct Notification to make
it more compact and require just one palloc per event, rather than
two or three. This saves space when there are a lot of events,
in fact more than enough to buy back the space needed for the hash
table.
Patch by me, based on discussions around a different patch
submitted by Filip Rembiałkowski.
Discussion: https://postgr.es/m/17822.1564186806@sss.pgh.pa.us
This is a fix similar to 2d7d67cc, where slight plan alteration can
cause a random failure of this regression test because of an incorect
tuple ordering, except that this one involves lookups of pg_type.
Similarly to the other case, add ORDER BY clauses to ensure the output
order.
The failure has been seen at least once on buildfarm member skink.
Reported-by: Thomas Munro
Discussion: https://postgr.es/m/CA+hUKGLjR9ZBvhXcr9b-NSBHPw9aRgbjyzGE+kqLsT4vwX+nkQ@mail.gmail.com
Backpatch-through: 12
This test case could fail because of an incorrect result ordering when
looking up at pg_class entries. This commit adds an ORDER BY to the
culprit query. The cause of the failure was likely caused by a plan
switch. By default, the planner would likely choose an index-only scan
or an index scan, but even a small change in the startup cost could have
caused a bitmap heap scan to be chosen, causing the failure.
While on it, switch some filtering quals to a regular expression as per
an idea of Tom Lane. As previously shaped, the quals would have
selected any relations whose name begins with "temp". And that could
cause failures if another test running in parallel began to use similar
relation names.
Per report from buildfarm member anole, though the failure was very
rare. This test has been introduced by 319a810, so backpatch down to
v10.
Discussion: https://postgr.es/m/20190807132422.GC15695@paquier.xyz
Backpatch-through: 10
As coded, the ICU-collation path in pattern_char_isalpha() failed
to consider regular ASCII letters to be case-varying. This led to
like_fixed_prefix treating too much of an ILIKE pattern as being a
fixed prefix, so that indexscans derived from an ILIKE clause might
miss entries that they should find.
Per bug #15892 from James Inform. This is an oversight in the original
ICU patch (commit eccfef81e), so back-patch to v10 where that came in.
Discussion: https://postgr.es/m/15892-e5d2bea3e8a04a1b@postgresql.org
This reverts much of commit f03a9ca4366d064d89b7cf7ed75d4e43f2ed0667,
but leaves the relpages/reltuples probe in select_parallel.sql.
The pg_stat_all_tables probes are unstable enough to be annoying,
and it no longer seems likely that they will teach us anything more
about the underlying problem. I'd still like some more confirmation
though that the observed plan instability is caused by VACUUM leaving
relpages/reltuples as zero for one of these tables.
Discussion: https://postgr.es/m/CA+hUKG+0CxrKRWRMf5ymN3gm+BECHna2B-q1w8onKBep4HasUw@mail.gmail.com
We have implemented jsonpath string comparison using default database locale.
However, standard requires us to compare Unicode codepoints. This commit
implements that, but for performance reasons we still use per-byte comparison
for "==" operator. Thus, for consistency other comparison operators do per-byte
comparison if Unicode codepoints appear to be equal.
In some edge cases, when same Unicode codepoints have different binary
representations in database encoding, we diverge standard to achieve better
performance of "==" operator. In future to implement strict standard
conformance, we can do normalization of input JSON strings.
Original patch was written by Nikita Glukhov, rewritten by me.
Reported-by: Markus Winand
Discussion: https://postgr.es/m/8B7FA3B4-328D-43D7-95A8-37B8891B8C78%40winand.at
Author: Nikita Glukhov, Alexander Korotkov
Backpatch-through: 12
This failed with either "tuple already updated by self" or "duplicate
key value violates unique constraint", depending on whether the table
had previously been analyzed or not. The reason is that ANALYZE tried
to insert or update the same pg_statistic rows twice, and there was no
CommandCounterIncrement between. So add one. The same case works fine
outside a transaction block, because then there's a whole transaction
boundary between, as a consequence of the way VACUUM works.
This issue has been latent all along, but the problem was unreachable
before commit 11d8d72c2 added the ability to specify multiple tables
in ANALYZE. We could, perhaps, alternatively fix it by adding code to
de-duplicate the list of VacuumRelations --- but that would add a
lot of overhead to work around dumb commands, so it's not attractive.
Per bug #15946 from Yaroslav Schekin. Back-patch to v11.
(Note: in v11 I also back-patched the test added by commit 23224563d;
otherwise the problem doesn't manifest in the test I added, because
"vactst" is empty when the tests for multiple ANALYZE targets are
reached. That seems like not a very good thing anyway, so I did this
rather than rethinking the choice of test case.)
Discussion: https://postgr.es/m/15946-5c7570a2884a26cf@postgresql.org
We were applying constraint exclusion on the partition constraint when
generating pruning steps for a clause, but only for the rather
restricted situation of them being boolean OR operators; however it is
possible to have differently shaped clauses that also benefit from
constraint exclusion. This applies particularly to the default
partition since their constraints are in essence a long list of OR'ed
subclauses ... but it applies to other cases too. So in certain cases
we're scanning partitions that we don't need to.
Remove the specialized code in OR clauses, and add a generally
applicable test of the clause refuting the partition constraint; mark
the whole pruning operation as contradictory if it hits.
This has the unwanted side-effect of testing some (most? all?)
constraints more than once if constraint_exclusion=on. That seems
unavoidable as far as I can tell without some additional work, but
that's not the recommended setting for that parameter anyway.
However, because this imposes additional processing cost for all
queries using partitioned tables, I decided not to backpatch this
change.
Author: Amit Langote, Yuzuko Hosoya, Álvaro Herrera
Reviewers: Shawn Wang, Thibaut Madeleine, Yoshikazu Imai, Kyotaro
Horiguchi; they were also uncredited reviewers for commit 489247b0e615.
Discussion: https://postgr.es/m/9bb31dfe-b0d0-53f3-3ea6-e64b811424cf@lab.ntt.co.jp
In serializable mode, heap_hot_search_buffer() incorrectly acquired a
predicate lock on the root tuple, not the returned tuple that satisfied
the visibility checks. As explained in README-SSI, the predicate lock does
not need to be copied or extended to other tuple versions, but for that to
work, the correct, visible, tuple version must be locked in the first
place.
The original SSI commit had this bug in it, but it was fixed back in 2013,
in commit 81fbbfe335. But unfortunately, it was reintroduced a few months
later in commit b89e151054. Wising up from that, add a regression test
to cover this, so that it doesn't get reintroduced again. Also, move the
code that sets 't_self', so that it happens at the same time that the
other HeapTuple fields are set, to make it more clear that all the code in
the loop operate on the "current" tuple in the chain, not the root tuple.
Bug spotted by Andres Freund, analysis and original fix by Thomas Munro,
test case and some additional changes to the fix by Heikki Linnakangas.
Backpatch to all supported versions (9.4).
Discussion: https://www.postgresql.org/message-id/20190731210630.nqhszuktygwftjty%40alap3.anarazel.de
When parsing a timetz string with a dynamic timezone abbreviation or a
timezone not specified, it was possible to generate incorrect timestamps
based on a date which uses some non-initialized variables if the input
string did not specify fully a date to parse. This is already checked
when a full timezone spec is included in the input string, but the two
other cases mentioned above missed the same checks.
This gets fixed by generating an error as this input is invalid, or in
short when a date is not fully specified.
Valgrind was complaining about this problem.
Bug: #15910
Author: Alexander Lakhin
Discussion: https://postgr.es/m/15910-2eba5106b9aa0c61@postgresql.org
Backpatch-through: 9.4
src/test/kerberos and src/test/ldap try to run private authentication
servers, which of course might fail. The logs from these servers
were being dropped into the tmp_check/ subdirectory, but they should
be put in tmp_check/log/, because the buildfarm will only capture
log files in that subdirectory. Without the log output there's
little hope of diagnosing buildfarm failures related to these servers.
Backpatch to v11 where these test suites were added.
Discussion: https://postgr.es/m/16017.1565047605@sss.pgh.pa.us
Commit bf6c614a2 rearranged the lookup of the comparison operators
needed in a hashed subplan, and in so doing, broke the cross-type
case: it caused the original LHS-vs-RHS operator to be used to compare
hash table entries too (which of course are all of the RHS type).
This leads to C functions being passed a Datum that is not of the
type they expect, with the usual hazards of crashes and unauthorized
server memory disclosure.
For the set of hashable cross-type operators present in v11 core
Postgres, this bug is nearly harmless on 64-bit machines, which
may explain why it escaped earlier detection. But it is a live
security hazard on 32-bit machines; and of course there may be
extensions that add more hashable cross-type operators, which
would increase the risk.
Reported by Andreas Seltenreich. Back-patch to v11 where the
problem came in.
Security: CVE-2019-10209
Commit aa27977fe21a7dfa4da4376ad66ae37cb8f0d0b5 introduced this
restriction for pg_temp.function_name(arg); do likewise for types
created in temporary schemas. Programs that this breaks should add
"pg_temp." schema qualification or switch to arg::type_name syntax.
Back-patch to 9.4 (all supported versions).
Reviewed by Tom Lane. Reported by Tom Lane.
Security: CVE-2019-10208
