The check for sslsni only checked for existence of the parameter
but not for the actual value of the param. This meant that the
SNI extension was always turned on. Fix by inspecting the value
of sslsni and only activate the SNI extension iff sslsni has been
enabled. Also update the docs to be more in line with how other
boolean params are documented.
Backpatch to 14 where sslsni was first implemented.
Reviewed-by: Tom Lane
Backpatch-through: 14, where sslni was added
This fixes a bug in simplehash.h which caused an incorrect size mask to be
used when the hash table grew to SH_MAX_SIZE (2^32). The code was
incorrectly setting the size mask to 0 when the hash tables reached the
maximum possible number of buckets. This would result always trying to
use the 0th bucket causing an infinite loop of trying to grow the hash
table due to there being too many collisions.
Seemingly it's not that common for simplehash tables to ever grow this big
as this bug dates back to v10 and nobody seems to have noticed it before.
However, probably the most likely place that people would notice it would
be doing a large in-memory Hash Aggregate with something close to at least
2^31 groups.
After this fix, the code now works correctly with up to within 98% of 2^32
groups and will fail with the following error when trying to insert any
more items into the hash table:
ERROR: hash table size exceeded
However, the work_mem (or hash_mem_multiplier in newer versions) settings
will generally cause Hash Aggregates to spill to disk long before reaching
that many groups. The minimal test case I did took a work_mem setting of
over 192GB to hit the bug.
simplehash hash tables are used in a few other places such as Bitmap Index
Scans, however, again the size that the hash table can become there is
also limited to work_mem and it would take a relation of around 16TB
(2^31) pages and a very large work_mem setting to hit this. With smaller
work_mem values the table would become lossy and never grow large enough
to hit the problem.
Author: Yura Sokolov
Reviewed-by: David Rowley, Ranier Vilela
Discussion: https://postgr.es/m/b1f7f32737c3438136f64b26f4852b96@postgrespro.ru
Backpatch-through: 10, where simplehash.h was added
It's hard to disable ASLR on current macOS releases, for testing with
-DEXEC_BACKEND. You could already set the environment variable
PG_SHMEM_ADDR to something not likely to collide with mappings created
earlier in process startup. Let's also provide a default value that
works on current releases and architectures, for developer convenience.
As noted in the pre-existing comment, this is a horrible hack, but
-DEXEC_BACKEND is only used by Unix-based PostgreSQL developers for
testing some otherwise Windows-only code paths, so it seems excusable.
Back-patch to all supported branches.
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/20210806032944.m4tz7j2w47mant26%40alap3.anarazel.de
The FDW batching code was using the same tuple descriptor both for all
slots (regular and plan slots), but that's incorrect - the subplan may
use a different descriptor. Currently this is benign, because batching
is used only for INSERTs, and in that case the descriptors always match.
But that would change if we allow batching UPDATEs.
Fix by copying the appropriate tuple descriptor. Backpatch to 14, where
the FDW batching was implemented.
Author: Amit Langote
Backpatch-through: 14, where FDW batching was added
Discussion: https://postgr.es/m/CA%2BHiwqEWd5B0-e-RvixGGUrNvGkjH2s4m95%3DJcwUnyV%3Df0rAKQ%40mail.gmail.com
It's not sensible to re-evaluate a direct-modify Foreign Update or Delete
during EvalPlanQual. However, ExecInitForeignScan() can still get called
if a table mixes local and foreign partitions. EvalPlanQualStart() left
the es_result_relations array uninitialized in the child EPQ EState, but
ExecInitForeignScan() still expected to find it. That caused a segfault.
Fix by skipping the es_result_relations lookup during EvalPlanQual
processing. To make things a bit more robust, also skip the
BeginDirectModify calls, and add a runtime check that ExecForeignScan()
is not called on direct-modify foreign scans during EvalPlanQual
processing.
This is new in v14, commit 1375422c78. Before that, EvalPlanQualStart()
copied the whole ResultRelInfo array to the EPQ EState. Backpatch to v14.
Report and diagnosis by Andrey Lepikhov.
Discussion: https://www.postgresql.org/message-id/cb2b808d-cbaa-4772-76ee-c8809bafcf3d%40postgrespro.ru
As a result of confusion about whether the "char" type is signed or
unsigned, scans for index searches like "col < 'x'" or "col <= 'x'"
would start at the middle of the index not the left end, thus missing
many or all of the entries they should find. Fortunately, this
is not a symptom of index corruption. It's only the search logic
that is broken, and we can fix it without unpleasant side-effects.
Per report from Jason Kim. This has been wrong since btree_gin's
beginning, so back-patch to all supported branches.
Discussion: https://postgr.es/m/20210810001649.htnltbh7c63re42p@jasonk.me
In ec34040af I added a mention that there was no point in setting
maintenance_work_limit to anything higher than 1GB for vacuum, but that
was incorrect as ginInsertCleanup() also looks at what
maintenance_work_mem is set to during VACUUM and that's not limited to
1GB.
Here I attempt to make it more clear that the limitation is only around
the number of dead tuple identifiers that we can collect during VACUUM.
I've also added a note to autovacuum_work_mem to mention this limitation.
I didn't do that in ec34040af as I'd had some wrong-headed ideas about
just limiting the maximum value for that GUC to 1GB.
Author: David Rowley
Discussion: https://postgr.es/m/CAApHDvpGwOAvunp-E-bN_rbAs3hmxMoasm5pzkYDbf36h73s7w@mail.gmail.com
Backpatch-through: 9.6, same as ec34040af
This saves a few lines of code. Also add a comment to mention why we use
ExplainPropertyInteger instead of ExplainPropertyUInteger given that
queryid is a uint64 type.
Author: David Rowley
Reviewed-by: Julien Rouhaud
Discussion: https://postgr.es/m/CAApHDvqhSLYpSU_EqUdN39w9Uvb8ogmHV7_3YhJ0S3aScGBjsg@mail.gmail.com
Backpatch-through: 14, where this code was originally added
Since commit e462856a7a, pg_upgrade automatically creates a script to
update extensions, so mention that instead of ALTER EXTENSION.
Backpatch-through: 9.6
Copy-and-pasteo in 665c5855e, evidently. The 9.6 docs toolchain
whined about duplicate index entries, though our modern toolchain
doesn't. In any case, these GUCs surely are not about the
default settings of these values.
I had committer's remorse almost immediately after pushing cb76fbd7e,
upon finding that removing capturing subexpressions' subREs from the
data structure broke my proposed patch for REG_NOSUB optimization.
Revert that data structure change. Instead, address the concern
about not changing capturing subREs' endpoints by not changing the
endpoints. We don't need to, because the point of that bit was just
to ensure that the atom has endpoints distinct from the outer state
pair that we're stringing the branch between. We already made
suitable states in the parenthesized-subexpression case, so the
additional ones were just useless overhead. This seems more
understandable than Spencer's original coding, and it ought to be
a shade faster too by saving a few state creations and arc changes.
(I actually see a couple percent improvement on Jacobson's web
corpus, though that's barely above the noise floor so I wouldn't
put much stock in that result.)
Also, fix the logic added by ea1268f63 to ensure that the subRE
recorded in v->subs[subno] is exactly the one with capno == subno.
Spencer's original coding recorded the child subRE of the capture
node, which is okay so far as having the right endpoint states is
concerned, but as of cb76fbd7e the capturing subRE itself always
has those endpoints too. I think the inconsistency is confusing
for the REG_NOSUB optimization.
As before, backpatch to v14.
Discussion: https://postgr.es/m/0203588E-E609-43AF-9F4F-902854231EE7@enterprisedb.com
Up to now, we remembered the definition of a capturing parenthesis
subexpression by storing a pointer to the associated subRE node.
That was okay before, because that subRE didn't get modified anymore
while parsing the rest of the regexp. However, in the wake of
commit ea1268f63, that's no longer true: the outer invocation of
parseqatom() feels free to scribble on that subRE. This seems to
work anyway, because the states we jam into the child atom in the
"prepare a general-purpose state skeleton" stanza aren't really
semantically different from the original endpoints of the child atom.
But that would be mighty easy to break, and it's definitely not how
things worked before.
Between this and the issue fixed in the prior commit, it seems best
to get rid of this dependence on subRE nodes entirely. We don't need
the whole child subRE for future backrefs, only its starting and ending
NFA states; so let's just store pointers to those.
Also, in the corner case where we make an extra subRE to handle
immediately-nested capturing parentheses, it seems like it'd be smart
to have the extra subRE have the same begin/end states as the original
child subRE does (s/s2 not lp/rp). I think that linking it from lp to
rp might actually be semantically wrong, though since Spencer's original
code did it that way, I'm not totally certain. Using s/s2 is certainly
not wrong, in any case.
Per report from Mark Dilger. Back-patch to v14 where the problematic
patches came in.
Discussion: https://postgr.es/m/0203588E-E609-43AF-9F4F-902854231EE7@enterprisedb.com
Commit cebc1d34e taught parseqatom() to optimize cases where a branch
contains only one, "messy", atom by getting rid of excess subRE nodes.
The way we really should do that is to keep the subRE built for the
"messy" child atom; but to avoid changing parseqatom's nominal API,
I made it delete that node after copying its fields to the outer subRE
made by parsebranch(). It seems that that actually worked at the time;
but it became dangerous after ea1268f63, because that later commit
allowed the lower invocation of parse() to return a subRE that was also
pointed to by some v->subs[] entry. This meant we could wind up with a
dangling pointer in v->subs[], allowing a later backref to misbehave,
but only if that subRE struct had been reused in between. So the damage
seems confined to cases like '((...))...(...\2'.
To fix, do what I should have done before and modify parseqatom's API
to make it possible for it to remove the caller's subRE instead of the
callee's. That's safer because we know that subRE isn't complete yet,
so noplace else will have a pointer to it.
Per report from Mark Dilger. Back-patch to v14 where the problematic
patches came in.
Discussion: https://postgr.es/m/0203588E-E609-43AF-9F4F-902854231EE7@enterprisedb.com
Rather than trying to pick table aliases that won't conflict with
any possible user-defined matview column name, adjust the queries'
syntax so that the aliases are only used in places where they can't be
mistaken for column names. Mostly this consists of writing "alias.*"
not just "alias", which adds clarity for humans as well as machines.
We do have the issue that "SELECT alias.*" acts differently from
"SELECT alias", but we can use the same hack ruleutils.c uses for
whole-row variables in SELECT lists: write "alias.*::compositetype".
We might as well revert to the original aliases after doing this;
they're a bit easier to read.
Like 75d66d10e, back-patch to all supported branches.
Discussion: https://postgr.es/m/2488325.1628261320@sss.pgh.pa.us
Casting a value that's already of a type with a specific typmod
to an unspecified typmod doesn't do anything so far as run-time
behavior is concerned. However, it really ought to change the
exposed type of the expression to match. Up to now,
coerce_type_typmod hasn't bothered with that, which creates gotchas
in contexts such as recursive unions. If for example one side of
the union is numeric(18,3), but it needs to be plain numeric to
match the other side, there's no direct way to express that.
This is easy enough to fix, by inserting a RelabelType to update the
exposed type of the expression. However, it's a bit nervous-making
to change this behavior, because it's stood for a really long time.
(I strongly suspect that it's like this in part because the logic
pre-dates the introduction of RelabelType in 7.0. The commit log
message for 57b30e8e2 is interesting reading here.) As a compromise,
we'll sneak the change into 14beta3, and consider back-patching to
stable branches if no complaints emerge in the next three months.
Discussion: https://postgr.es/m/CABNQVagu3bZGqiTjb31a8D5Od3fUMs7Oh3gmZMQZVHZ=uWWWfQ@mail.gmail.com
Formerly, the numeric code tested whether an integer value of a larger
type would fit in a smaller type by casting it to the smaller type and
then testing if the reverse conversion produced the original value.
That's perfectly fine, except that it caused a test failure on
buildfarm animal castoroides, most likely due to a compiler bug.
Instead, do these tests by comparing against PG_INT16/32_MIN/MAX. That
matches existing code in other places, such as int84(), which is more
widely tested, and so is less likely to go wrong.
While at it, add regression tests covering the numeric-to-int8/4/2
conversions, and adjust the recently added tests to the style of
434ddfb79a (on the v11 branch) to make failures easier to diagnose.
Per buildfarm via Tom Lane, reviewed by Tom Lane.
Discussion: https://postgr.es/m/2394813.1628179479%40sss.pgh.pa.us
postgres_fdw imported generated columns from the remote tables as plain
columns, and caused failures like "ERROR: cannot insert a non-DEFAULT
value into column "foo"" when inserting into the foreign tables, as it
tried to insert values into the generated columns. To fix, we do the
following under the assumption that generated columns in a postgres_fdw
foreign table are defined so that they represent generated columns in
the underlying remote table:
* Send DEFAULT for the generated columns to the foreign server on insert
or update, not generated column values computed on the local server.
* Add to postgresImportForeignSchema() an option "import_generated" to
include column generated expressions in the definitions of foreign
tables imported from a foreign server. The option is true by default.
The assumption seems reasonable, because that would make a query of the
postgres_fdw foreign table return values for the generated columns that
are consistent with the generated expression.
While here, fix another issue in postgresImportForeignSchema(): it tried
to include column generated expressions as column default expressions in
the foreign table definitions when the import_default option was enabled.
Per bug #16631 from Daniel Cherniy. Back-patch to v12 where generated
columns were added.
Discussion: https://postgr.es/m/16631-e929fe9db0ffc7cf%40postgresql.org
This fixes a long-standing bug when using to_char() to format a
numeric value in scientific notation -- if the value's exponent is
less than -NUMERIC_MAX_DISPLAY_SCALE-1 (-1001), it produced a
division-by-zero error.
The reason for this error was that get_str_from_var_sci() divides its
input by 10^exp, which it produced using power_var_int(). However, the
underflow test in power_var_int() causes it to return zero if the
result scale is too small. That's not a problem for power_var_int()'s
only other caller, power_var(), since that limits the rscale to 1000,
but in get_str_from_var_sci() the exponent can be much smaller,
requiring a much larger rscale. Fix by introducing a new function to
compute 10^exp directly, with no rscale limit. This also allows 10^exp
to be computed more efficiently, without any numeric multiplication,
division or rounding.
Discussion: https://postgr.es/m/CAEZATCWhojfH4whaqgUKBe8D5jNHB8ytzemL-PnRx+KCTyMXmg@mail.gmail.com
Up to now we did a PQconsumeInput() for each pipelined query, asking the OS
for more input - which it often won't have, as all results might already have
been sent. That turns out to have a noticeable performance impact.
Alvaro Herrera reviewed the idea to add the PQisBusy() check, but not this
concrete patch.
Author: Andres Freund <andres@anarazel.de>
Discussion: https://postgr.es/m/20210720180039.23rivhdft3l4mayn@alap3.anarazel.de
Backpatch: 14, where libpq/pgbench pipelining was introduced.
Oversight in commit 3499df0d, which generalized the reloption as a way
of giving users a way to consistently avoid VACUUM's index bypass
optimization.
Per off-list report from Nikolay Shaplov.
Backpatch: 14-, where index cleanup reloption was extended.
I failed to account for the possibility that when
ExecAppendAsyncEventWait() notifies multiple async-capable nodes using
postgres_fdw, a preceding node might invoke process_pending_request() to
process a pending asynchronous request made by a succeeding node. In
that case the succeeding node should produce a tuple to return to the
parent Append node from tuples fetched by process_pending_request() when
notified. Repair.
Per buildfarm via Michael Paquier. Back-patch to v14, like the previous
commit.
Thanks to Tom Lane for testing.
Discussion: https://postgr.es/m/YQP0UPT8KmPiHTMs%40paquier.xyz
As of commit 84f5c2908, executing SQL commands (via SPI or otherwise)
requires having either an active Portal, or a caller-established
active snapshot. We were simply Assert'ing that that's the case.
But we've now had a couple different reports of people testing
extensions that didn't meet this requirement, and were confused by
the resulting crash. Let's convert the Assert to a test-and-elog,
in hopes of making the issue clearer for extension authors.
Per gripes from Liu Huailing and RekGRpth. Back-patch to v11,
like the prior commit.
Discussion: https://postgr.es/m/OSZPR01MB6215671E3C5956A034A080DFBEEC9@OSZPR01MB6215.jpnprd01.prod.outlook.com
Discussion: https://postgr.es/m/17035-14607d308ac8643c@postgresql.org
This fixes a couple of related problems that arise when raising
numbers to very large powers.
Firstly, when raising a negative number to a very large integer power,
the result should be well-defined, but the previous code would only
cope if the exponent was small enough to go through power_var_int().
Otherwise it would throw an internal error, attempting to take the
logarithm of a negative number. Fix this by adding suitable handling
to the general case in power_var() to cope with negative bases,
checking for integer powers there.
Next, when raising a (positive or negative) number whose absolute
value is slightly less than 1 to a very large power, the result should
approach zero as the power is increased. However, in some cases, for
sufficiently large powers, this would lose all precision and return 1
instead of 0. This was due to the way that the local_rscale was being
calculated for the final full-precision calculation:
local_rscale = rscale + (int) val - ln_dweight + 8
The first two terms on the right hand side are meant to give the
number of significant digits required in the result ("val" being the
estimated result weight). However, this failed to account for the fact
that rscale is clipped to a maximum of NUMERIC_MAX_DISPLAY_SCALE
(1000), and the result weight might be less then -1000, causing their
sum to be negative, leading to a loss of precision. Fix this by
forcing the number of significant digits calculated to be nonnegative.
It's OK for it to be zero (when the result weight is less than -1000),
since the local_rscale value then includes a few extra digits to
ensure an accurate result.
Finally, add additional underflow checks to exp_var() and power_var(),
so that they consistently return zero for cases like this where the
result is indistinguishable from zero. Some paths through this code
already returned zero in such cases, but others were throwing overflow
errors.
Dean Rasheed, reviewed by Yugo Nagata.
Discussion: http://postgr.es/m/CAEZATCW6Dvq7+3wN3tt5jLj-FyOcUgT5xNoOqce5=6Su0bCR0w@mail.gmail.com
CheckpointLock was removed in commit d18e75664a, and commit ce197e91d0
updated a leftover comment in CreateCheckPoint, but there was another
copy of it in CreateRestartPoint still.
A pending asynchronous request is handled by process_pending_request(),
which previously not only processed an in-progress remote query but
performed ExecForeignScan() to produce a tuple to return to the local
server asynchronously from the result of the remote query. But that led
to a server crash when executing a query or led to an "InstrStartNode
called twice in a row" or "InstrEndLoop called on running node" failure
when doing EXPLAIN ANALYZE of it, in cases where the plan tree for it
contained multiple async-capable nodes accessing the same
initplan/subplan that contained multiple async-capable nodes scanning
the same foreign tables as for the parent async-capable nodes, as
reported by Andrey Lepikhov. The reason is that the second step in
process_pending_request() invoked when executing the initplan/subplan
for one of the parent async-capable nodes caused recursive execution of
the initplan/subplan for another of the parent async-capable nodes.
To fix, split process_pending_request() into the two steps and postpone
the second step until ForeignAsyncConfigureWait() is called for each of
the pending asynchronous requests. Also, in ExecAppendAsyncEventWait()
we assumed that FDWs would register at least one wait event in a
WaitEventSet created there when they were called from
ForeignAsyncConfigureWait() in that function, but allow FDWs to register
zero wait events in the WaitEventSet; modify ExecAppendAsyncEventWait()
to just return in that case.
Oversight in commit 27e1f1456. Back-patch to v14 where that commit went
in.
Andrey Lepikhov and Etsuro Fujita
Discussion: https://postgr.es/m/fe5eaa19-1704-e4a4-76ee-3b9d37ade399@postgrespro.ru
Buildfarm shows that this test has a further failure mode when a
checkpoint starts earlier than expected, so we detect a "checkpoint
completed" line that's not the one we want. Change the config to try
and prevent this.
Per buildfarm
While at it, update one comment that was forgotten in commit
d18e75664a.
Author: Kyotaro Horiguchi <horikyota.ntt@gmail.com>
Discussion: https://postgr.es/m/20210729.162038.534808353849568395.horikyota.ntt@gmail.com
Commit ffa2e4670 changed libpq so that multiple error reports
occurring during one operation (a connection attempt or query)
are accumulated in conn->errorMessage, where before new ones
usually replaced any prior error. At least in theory, that makes
us more vulnerable to running out of memory for the errorMessage
buffer. If it did happen, the user would be left with just an
empty-string error report, which is pretty unhelpful.
We can improve this by relying on pqexpbuffer.c's existing "broken
buffer" convention to track whether we've hit OOM for the current
operation's error string, and then substituting a constant "out of
memory" string in the small number of places where the errorMessage
is read out.
While at it, apply the same method to similar OOM cases in
pqInternalNotice and pqGetErrorNotice3.
Back-patch to v14 where ffa2e4670 came in. In principle this could
go back further; but in view of the lack of field reports, the
hazard seems negligible in older branches.
Discussion: https://postgr.es/m/530153.1627425648@sss.pgh.pa.us
Certain versions of msys2/Windows have been observed to resolve symlinks
in perl2host rather than just follow them. This defeats using a
symlinked shorter path to a longer path, and makes certain tests fail.
We therefore call perl2host on the parent directory of the symlink and
thereafter just use that result.
Apply to release 14 where the problem has been observed.
Sometimes cygpath has been observed to return a path with a trailing
slash. That can cause problems, Also, make "cygpath" usage
consistent with "pwd -W" with respect to the use of forward slashes.
Backpatch to release 14 where the current code was introduced.
pg_verifybackup needs by default pg_waldump to check after a range of
WAL segments required for a backup, except if --no-parse-wal is
specified. The code checked for the presence of the binary pg_waldump
in an installation and reported an error, but it forgot to properly
exit(). This could lead to confusing errors reported.
Reviewed-by: Robert Haas, Fabien Coelho
Discussion: https://postgr.es/m/YQDMdB+B68yePFeT@paquier.xyz
Backpatch-through: 13
If a file is truncated, we must update minRecoveryPoint. Once a file is
truncated, there's no going back; it would not be safe to stop recovery
at a point earlier than that anymore.
Commit 7bffc9b7bf changed xact_redo_commit() so that it updates
minRecoveryPoint on truncation, but forgot to change xact_redo_abort().
Back-patch to all supported versions.
Reported-by: mengjuan.cmj@alibaba-inc.com
Author: Fujii Masao
Reviewed-by: Heikki Linnakangas
Discussion: https://postgr.es/m/b029fce3-4fac-4265-968e-16f36ff4d075.mengjuan.cmj@alibaba-inc.com
It wasn't all that clear which lock levels, if any, would be held on the
DEFAULT partition during an ATTACH PARTITION operation.
Also, clarify which locks will be taken if the DEFAULT partition or the
table being attached are themselves partitioned tables.
Here I'm only backpatching to v12 as before then we obtained an ACCESS
EXCLUSIVE lock on the partitioned table. It seems much less relevant to
mention which locks are taken on other tables when the partitioned table
itself is locked with an ACCESS EXCLUSIVE lock.
Author: Matthias van de Meent, David Rowley
Discussion: https://postgr.es/m/CAEze2WiTB6iwrV8W_J=fnrnZ7fowW3qu-8iQ8zCHP3FiQ6+o-A@mail.gmail.com
Backpatch-through: 12
Daniel Gustafsson
David Rowley
Thomas Munro
Tomas Vondra
Heikki Linnakangas
Tom Lane
Peter Eisentraut
Bruce Momjian
Dean Rasheed
Etsuro Fujita
Andres Freund
Peter Geoghegan
John Naylor
Amit Kapila
Alvaro Herrera
Andrew Dunstan
Michael Paquier
Fujii Masao