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I did this by adding another locking process, which makes the other two
wait. This way the output should be stable enough.
Per buildfarm and Andres Freund
Discussion: https://postgr.es/m/20180103034445.t3utrtrnrevfsghm@alap3.anarazel.de
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Backpatch-through: certain files through 9.3
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Previously aggregate transition values for hash and other forms of
aggregation (i.e. sort and no group by) were represented
differently. Hash based aggregation used a grouping set indexed array
pointing to an array of transition values, whereas other forms of
aggregation used one flattened array with the index being computed out
of grouping set and transition offsets.
That made upcoming changes hard, so represent both as grouping set
indexed array of per-group data.
As a nice side-effect this also makes aggregation slightly faster,
because computing offsets with `transno + (setno * numTrans)` turns
out not to be that cheap (too big for x86 lea for example).
Author: Andres Freund
Discussion: https://postgr.es/m/20171128003121.nmxbm2ounxzb6n2t@alap3.anarazel.de
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The previous coding relied (without any documentation) on the data[]
member of HashMemoryChunkData being at a MAXALIGN'ed offset. If it
was not, the tuples would not be maxaligned either, leading to failures
on alignment-picky machines. While there seems to be no live bug on any
platform we support, this is clearly pretty fragile: any addition to or
rearrangement of the fields in HashMemoryChunkData could break it.
Let's remove the hazard by getting rid of the data[] member and instead
using pointer arithmetic with an explicitly maxalign'ed offset.
Discussion: https://postgr.es/m/14483.1514938129@sss.pgh.pa.us
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Multiple sessions doing CREATE INDEX CONCURRENTLY simultaneously are
supposed to be able to work in parallel, as evidenced by fixes in commit
c3d09b3bd23f specifically to support this case. In reality, one of the
sessions would be aborted by a misterious "deadlock detected" error.
Jeff Janes diagnosed that this is because of leftover snapshots used for
system catalog scans -- this was broken by 8aa3e47510b9 keeping track of
(registering) the catalog snapshot. To fix the deadlocks, it's enough
to de-register that snapshot prior to waiting.
Backpatch to 9.4, which introduced MVCC catalog scans.
Include an isolationtester spec that 8 out of 10 times reproduces the
deadlock with the unpatched code for me (Álvaro).
Author: Jeff Janes
Diagnosed-by: Jeff Janes
Reported-by: Jeremy Finzel
Discussion: https://postgr.es/m/CAMa1XUhHjCv8Qkx0WOr1Mpm_R4qxN26EibwCrj0Oor2YBUFUTg%40mail.gmail.com
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The original idea was that we could use an isNull-style bool array
directly as a GinNullCategory array. However, the existing code already
acknowledges that that doesn't really work, because of the possibility
that bool as currently defined can have arbitrary bit patterns for true
values. So it has to loop through the nullFlags array to set each bool
value to an acceptable value. But if we are looping through the whole
array anyway, we might as well build a proper GinNullCategory array
instead and abandon the type casting. That makes the code much safer in
case bool is ever changed to something else.
Reviewed-by: Michael Paquier <michael.paquier@gmail.com>
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In a race case, EXPLAIN ANALYZE could fail to display correct nbatch
and size information. Refactor so that participants report only on
batches they worked on rather than trying to report on all of them,
and teach explain.c to consider the HashInstrumentation object from
all participants instead of picking the first one it can find. This
should fix an occasional build farm failure in the "join" regression
test.
Author: Thomas Munro
Reviewed-By: Andres Freund
Discussion: https://postgr.es/m/30219.1514428346%40sss.pgh.pa.us
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Otherwise, the test fails with "Timed out while waiting for standby to
catch up". This happened rarely, perhaps only when autovacuum wrote WAL
between our choosing the recovery target and choosing the LSN to await.
Commit b26f7fa6ae2b4e5d64525b3d5bc66a0ddccd9e24 fixed one case of this.
Fix two more. Back-patch to 9.6, which introduced the affected test.
Discussion: https://postgr.es/m/20180101055227.GA2952815@rfd.leadboat.com
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plpgsql's five different loop control statements contained three distinct
implementations of the same (or what ought to be the same, at least)
logic for handling return/exit/continue result codes from their child
statements. At best, that's trouble waiting to happen, and there seems
no very good reason for the coding to be so different. Refactor so that
all the common logic is expressed in a single macro.
Discussion: https://postgr.es/m/26314.1514670401@sss.pgh.pa.us
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I noticed that our code coverage report showed considerable deficiency
in test coverage for PL/pgSQL control statements. Notably, both
exec_stmt_block and most of the loop control statements had very poor
coverage of handling of return/exit/continue result codes from their
child statements; and exec_stmt_fori was seriously lacking in feature
coverage, having no test that exercised its BY or REVERSE features,
nor verification that its overflow defenses work.
Now that we have some infrastructure for plpgsql-specific test scripts,
the natural thing to do is make a new script rather than further extend
plpgsql.sql. So I created a new script plpgsql_control.sql with the
charter to test plpgsql control structures, and moved a few existing
tests there because they fell entirely under that charter. I then
added new test cases that exercise the bits of code complained of above.
Of the five kinds of loop statements, only exec_stmt_while's result code
handling is fully exercised by these tests. That would be a deficiency
as things stand, but a follow-on commit will merge the loop statements'
result code handling into one implementation. So testing each usage of
that implementation separately seems redundant.
In passing, also add a couple test cases to plpgsql.sql to more fully
exercise plpgsql's code related to expanded arrays --- I had thought
that area was sufficiently covered already, but the coverage report
showed a couple of un-executed code paths.
Discussion: https://postgr.es/m/26314.1514670401@sss.pgh.pa.us
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This reduces code duplication a bit, but the primary benefit that it
makes JITing expression evaluation easier. When doing so we can't, as
previously done in the interpreted case, really change opcode without
recompiling. Nor dow we just carry around unnecessary branches to
avoid re-checking over and over.
As a minor side-effect this makes ExecEvalStepOp() O(log(N)) rather
than O(N).
Author: Andres Freund
Discussion: https://postgr.es/m/20170901064131.tazjxwus3k2w3ybh@alap3.anarazel.de
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This is useful because it gets rid of the sole direct user of
ExecAssignResultType(). A future commit will likely make use of that
and combine creating the targetlist with the initialization of the
result slot. But it seems like good code hygiene anyway.
Author: Andres Freund
Discussion: https://postgr.es/m/20170901064131.tazjxwus3k2w3ybh@alap3.anarazel.de
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When walsenders were included in pg_stat_activity, only the ones
actually streaming WAL were listed as active when they were active. In
particular, the connections sending base backups were listed as being
idle. Which means that a regular pg_basebackup would show up with one
active and one idle connection, when both were active.
This patch updates to set all walsenders to active when they are
(including those doing very fast things like IDENTIFY_SYSTEM), and then
back to idle. Details about exactly what they are doing is available in
pg_stat_replication.
Patch by me, review by Michael Paquier and David Steele.
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A momentary window exists when synchronous_standby_names
changes that allows commands issued after the change to
continue to act as async until the change becomes visible.
Remove the race by using more appropriate test in syncrep.c
Author: Asim Rama Praveen and Ashwin Agrawal
Reported-by: Xin Zhang, Ashwin Agrawal, and Asim Rama Praveen
Reviewed-by: Michael Paquier, Masahiko Sawada
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Author: Feike Steenbergen
Reviewed-by: Michael Paquier
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Following commit 7a727c18 this is found to be necessary on at least some
Windows platforms.
per buildfarm.
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When a backend runs out of inner tuples to hash, it should detach from
grow_batch_barrier only after it has flushed all batches to disk and
merged counters, not before. Otherwise a concurrent backend in
ExecParallelHashIncreaseNumBatches() could stop waiting for this
backend and try to read tuples before they have been written. This
commit reorders those operations and should fix the assertion failures
seen occasionally on the build farm since commit
1804284042e659e7d16904e7bbb0ad546394b6a3.
Author: Thomas Munro
Discussion: https://postgr.es/m/E1eRwXy-0004IK-TO%40gemulon.postgresql.org
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Also, fix a comment that commit 8a0596cb656e made obsolete.
Reported-by: Robert Haas
Discussion: http://postgr.es/m/CA+TgmoYbpuUUUp2GhYNwWm0qkah39spiU7uOiNXLz20ASfKYoA@mail.gmail.com
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Thomas Munro
Discussion: http://postgr.es/m/CAEepm=1Vp1e3KtftLtw4B60ZV9teNeKu6HxoaaBptQMsRWjJbQ@mail.gmail.com
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Raúl Marín Rodríguez, reviewed by Fabien Coelho and Michael Paquier,
with a minor fix by me.
Discussion: http://postgr.es/m/CAM6_UM4XiA14y9HnDqu9kAAOtwMhHZxW--q_ZACZW9Hsrsf-tg@mail.gmail.com
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Hash index depends on estimation of numbers of tuples and pages of relations,
incorrect value could be a reason of significantly growing of index. Vacuum
full recreates heap and reindex all indexes before renewal stats. The patch
fixes that, so indexes will see correct values.
Backpatch to v10 only because earlier versions haven't usable hash index and
growing of hash index is a single user-visible symptom.
Author: Amit Kapila
Reviewed-by: Ashutosh Sharma, me
Discussion: https://www.postgresql.org/message-id/flat/20171115232922.5tomkxnw3iq6jsg7@inml.weebeastie.net
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This allows modules written in C++ to use or include header files that
use StaticAssertStmt() etc.
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
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Polygon opclass uses compress method feature of SP-GiST added earlier. For now
it's a single operator class which uses this feature. SP-GiST actually indexes
a bounding boxes of input polygons, so part of supported operations are lossy.
Opclass uses most methods of corresponding opclass over boxes of SP-GiST and
treats bounding boxes as point in 4D-space.
Bump catalog version.
Authors: Nikita Glukhov, Alexander Korotkov with minor editorization by me
Reviewed-By: all authors + Darafei Praliaskouski
Discussion: https://www.postgresql.org/message-id/flat/54907069.1030506@sigaev.ru
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Instead of asserting the assert just set the value to what it was
supposed to test...
Per coverity.
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Since 9.4, we've allowed the syntax "select union select" and variants
of that. However, the planner wasn't expecting a no-column set operation
and ended up treating the set operation as if it were UNION ALL.
Turns out it's trivial to fix in v10 and later; we just need to be careful
about not generating a Sort node with no sort keys. However, since a weird
corner case like this is never going to be exercised by developers, we'd
better have thorough regression tests if we want to consider it supported.
Per report from Victor Yegorov.
Discussion: https://postgr.es/m/CAGnEbojGJrRSOgJwNGM7JSJZpVAf8xXcVPbVrGdhbVEHZ-BUMw@mail.gmail.com
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Patch allows to have different types of column and value stored in leaf tuples
of SP-GiST. The main application of feature is to transform complex column type
to simple indexed type or for truncating too long value, transformation could
be lossy. Simple example: polygons are converted to their bounding boxes,
this opclass follows.
Authors: me, Heikki Linnakangas, Alexander Korotkov, Nikita Glukhov
Reviewed-By: all authors + Darafei Praliaskouski
Discussions:
https://www.postgresql.org/message-id/5447B3FF.2080406@sigaev.ru
https://www.postgresql.org/message-id/flat/54907069.1030506@sigaev.ru#54907069.1030506@sigaev.ru
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This fixes a few typos and small mistakes; it also cleans a few
minor stylistic issues. The biggest functional change is that
Gen_fmgrtab.pl no longer knows the OID of language 'internal'.
Author: John Naylor
Discussion: https://postgr.es/m/CAJVSVGXAkwbk-A9QHHHf00N905kKisyQbaYwKqaRpze_gPXGfg@mail.gmail.com
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currentCommandIdUsed is only used to skip redundant increments of the
command counter, and CommandCounterIncrement() is categorically denied
under parallelism anyway. Therefore, it's OK for
GetCurrentCommandId() to mark the counter value used, as long as it
happens in the leader, not a worker.
Prior to commit e9baa5e9fa147e00a2466ab2c40eb99c8a700824, the slightly
incorrect check didn't matter, but now it does. A test case added by
commit 1804284042e659e7d16904e7bbb0ad546394b6a3 uncovered the problem
by accident; it caused failures with force_parallel_mode=on/regress.
Report and review by Andres Freund. Patch by me.
Discussion: http://postgr.es/m/20171221143106.5lhtygohvmazli3x@alap3.anarazel.de
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This patch does three interrelated things:
* Create a new expression execution step type EEOP_PARAM_CALLBACK
and add the infrastructure needed for add-on modules to generate that.
As discussed, the best control mechanism for that seems to be to add
another hook function to ParamListInfo, which will be called by
ExecInitExpr if it's supplied and a PARAM_EXTERN Param is found.
For stand-alone expressions, we add a new entry point to allow the
ParamListInfo to be specified directly, since it can't be retrieved
from the parent plan node's EState.
* Redesign the API for the ParamListInfo paramFetch hook so that the
ParamExternData array can be entirely virtual. This also lets us get rid
of ParamListInfo.paramMask, instead leaving it to the paramFetch hook to
decide which param IDs should be accessible or not. plpgsql_param_fetch
was already doing the identical masking check, so having callers do it too
seemed redundant. While I was at it, I added a "speculative" flag to
paramFetch that the planner can specify as TRUE to avoid unwanted failures.
This solves an ancient problem for plpgsql that it couldn't provide values
of non-DTYPE_VAR variables to the planner for fear of triggering premature
"record not assigned yet" or "field not found" errors during planning.
* Rework plpgsql to get rid of the need for "unshared" parameter lists,
by dint of turning the single ParamListInfo per estate into a nearly
read-only data structure that doesn't instantiate any per-variable data.
Instead, the paramFetch hook controls access to per-variable data and can
make the right decisions on the fly, replacing the cases that we used to
need multiple ParamListInfos for. This might perhaps have been a
performance loss on its own, but by using a paramCompile hook we can
bypass plpgsql_param_fetch entirely during normal query execution.
(It's now only called when, eg, we copy the ParamListInfo into a cursor
portal. copyParamList() or SerializeParamList() effectively instantiate
the virtual parameter array as a simple physical array without a
paramFetch hook, which is what we want in those cases.) This allows
reverting most of commit 6c82d8d1f, though I kept the cosmetic
code-consolidation aspects of that (eg the assign_simple_var function).
Performance testing shows this to be at worst a break-even change,
and it can provide wins ranging up to 20% in test cases involving
accesses to fields of "record" variables. The fact that values of
such variables can now be exposed to the planner might produce wins
in some situations, too, but I've not pursued that angle.
In passing, remove the "parent" pointer from the arguments to
ExecInitExprRec and related functions, instead storing that pointer in a
transient field in ExprState. The ParamListInfo pointer for a stand-alone
expression is handled the same way; we'd otherwise have had to add
yet another recursively-passed-down argument in expression compilation.
Discussion: https://postgr.es/m/32589.1513706441@sss.pgh.pa.us
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That function currently exists to avoid leaking memory in
CacheMemoryContext in case of trouble while the partition key is being
built, but there's a better way: allocate everything in a memcxt that
goes away if the current (sub)transaction fails, and once the partition
key is built and no further errors can occur, make the memcxt permanent
by making it a child of CacheMemoryContext.
Reviewed-by: Tom Lane
Discussion: https://postgr.es/m/20171027172730.eh2domlkpn4ja62m@alvherre.pgsql
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Various Perl scripts we use to generate files were in the habit of
printing things like "generated by $0" into their output files.
That looks like a fine idea at first glance, but it results in
non-reproducible output, because in VPATH builds $0 won't be just
the name of the script file, but a full path for it. We'd prefer
that you get identical results whether using VPATH or not, so this
is a bad thing.
Some of these places also printed their input file name(s), causing
an additional hazard of the same type.
Hence, establish a policy that thou shalt not print $0, nor input file
pathnames, into output files (they're still allowed in error messages,
though). Instead just write the script name verbatim. While we are at
it, we can make these annotations more useful by giving the script's
full relative path name within the PG source tree, eg instead of
Gen_fmgrtab.pl let's print src/backend/utils/Gen_fmgrtab.pl.
Not all of the changes made here actually affect any files shipped
in finished tarballs today, but it seems best to apply the policy
everyplace so that nobody copies unsafe code into places where it
could matter.
Christoph Berg and Tom Lane
Discussion: https://postgr.es/m/20171215102223.GB31812@msg.df7cb.de
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Generally, error recovery paths that need to do things like
LWLockReleaseAll and pgstat_report_wait_end also need to call
ConditionVariableCancelSleep, but AbortSubTransaction was missed.
Since subtransaction abort might destroy up the DSM segment that
contains the ConditionVariable stored in cv_sleep_target, this
can result in a crash for anything using condition variables.
Reported and diagnosed by Andres Freund.
Discussion: http://postgr.es/m/20171221110048.rxk6464azzl5t2fi@alap3.anarazel.de
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Introduce parallel-aware hash joins that appear in EXPLAIN plans as Parallel
Hash Join with Parallel Hash. While hash joins could already appear in
parallel queries, they were previously always parallel-oblivious and had a
partial subplan only on the outer side, meaning that the work of the inner
subplan was duplicated in every worker.
After this commit, the planner will consider using a partial subplan on the
inner side too, using the Parallel Hash node to divide the work over the
available CPU cores and combine its results in shared memory. If the join
needs to be split into multiple batches in order to respect work_mem, then
workers process different batches as much as possible and then work together
on the remaining batches.
The advantages of a parallel-aware hash join over a parallel-oblivious hash
join used in a parallel query are that it:
* avoids wasting memory on duplicated hash tables
* avoids wasting disk space on duplicated batch files
* divides the work of building the hash table over the CPUs
One disadvantage is that there is some communication between the participating
CPUs which might outweigh the benefits of parallelism in the case of small
hash tables. This is avoided by the planner's existing reluctance to supply
partial plans for small scans, but it may be necessary to estimate
synchronization costs in future if that situation changes. Another is that
outer batch 0 must be written to disk if multiple batches are required.
A potential future advantage of parallel-aware hash joins is that right and
full outer joins could be supported, since there is a single set of matched
bits for each hashtable, but that is not yet implemented.
A new GUC enable_parallel_hash is defined to control the feature, defaulting
to on.
Author: Thomas Munro
Reviewed-By: Andres Freund, Robert Haas
Tested-By: Rafia Sabih, Prabhat Sahu
Discussion:
https://postgr.es/m/CAEepm=2W=cOkiZxcg6qiFQP-dHUe09aqTrEMM7yJDrHMhDv_RA@mail.gmail.com
https://postgr.es/m/CAEepm=37HKyJ4U6XOLi=JgfSHM3o6B-GaeO-6hkOmneTDkH+Uw@mail.gmail.com
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Otherwise, when the query string is read, we might trailing garbage
beyond the end, unless there happens to be a \0 there by good luck.
Report and patch by Thomas Munro. Reviewed by Rafia Sabih.
Discussion: http://postgr.es/m/CAEepm=2SJs7X+_vx8QoDu8d1SMEOxtLhxxLNzZun_BvNkuNhrw@mail.gmail.com
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Commit 8526bcb2df76d5171b4f4d6dc7a97560a73a5eff fixed bugs related
to both Sort and Hash, but only added a test case for Sort. This
adds a test case for Hash to match.
Thomas Munro
Discussion: http://postgr.es/m/CAEepm=2-LRnfwUBZDqQt+XAcd0af_ykNyyVvP3h1uB1AQ=e-eA@mail.gmail.com
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When a Gather or Gather Merge node is started and stopped multiple
times, accumulate instrumentation data only once, at the end, instead
of after each execution, to avoid recording inflated totals.
Commit 778e78ae9fa51e58f41cbdc72b293291d02d8984, the previous attempt
at a fix, instead reset the state after every execution, which worked
for the general instrumentation data but had problems for the additional
instrumentation specific to Sort and Hash nodes.
Report by hubert depesz lubaczewski. Analysis and fix by Amit Kapila,
following a design proposal from Thomas Munro, with a comment tweak
by me.
Discussion: http://postgr.es/m/20171127175631.GA405@depesz.com
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Commit dc02c7bca4dccf7de278cdc6b3325a829e75b252 changed this call
to create_sort_path() to take -1 rather than limit_tuples because,
at that time, there was no way for a Sort beneath a Gather Merge
to become a top-N sort.
Later, commit 3452dc5240da43e833118484e1e9b4894d04431c provided
a way for a Sort beneath a Gather Merge to become a top-N sort,
but failed to revert the previous commit in the process. Do that.
Report and analysis by Jeff Janes; patch by Thomas Munro; review by
Amit Kapila and by me.
Discussion: http://postgr.es/m/CAEepm=1BWtC34vUroA0Uqjw02MaqdUrW+d6WD85_k8SLyPiKHQ@mail.gmail.com
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Discussion: http://postgr.es/m/CAEepm=2HzxAOKU6eCWTyvMwBy=fhGvbwDPM_fVps759tkyQSYQ@mail.gmail.com
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This parameter can be used to enforce the channel binding type used
during a SCRAM authentication. This can be useful to check code paths
where an invalid channel binding type is used by a client and will be
even more useful to allow testing other channel binding types when they
are added.
The default value is tls-unique, which is what RFC 5802 specifies.
Clients can optionally specify an empty value, which has as effect to
not use channel binding and use SCRAM-SHA-256 as chosen SASL mechanism.
More tests for SCRAM and channel binding are added to the SSL test
suite.
Author: Author: Michael Paquier <michael.paquier@gmail.com>
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SharedTuplestore allows multiple participants to write into it and
then read the tuples back from it in parallel. Each reader receives
partial results.
For now it always uses disk files, but other buffering policies and
other kinds of scans (ie each reader receives complete results) may be
useful in future.
The upcoming parallel hash join feature will use this facility.
Author: Thomas Munro
Reviewed-By: Peter Geoghegan, Andres Freund, Robert Haas
Discussion: https://postgr.es/m/CAEepm=2W=cOkiZxcg6qiFQP-dHUe09aqTrEMM7yJDrHMhDv_RA@mail.gmail.com
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Mechanism names for SCRAM and channel binding names have been included
in scram.h by the libpq frontend code, and this header references a set
of routines which are only used by the backend. scram-common.h is on
the contrary usable by both the backend and libpq, so getting those
names from there seems more reasonable.
Author: Michael Paquier <michael.paquier@gmail.com>
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Previously an assertion failure occurred when pg_stop_backup() for
non-exclusive backup was aborted while it's waiting for WAL files to
be archived. This assertion failure happened in do_pg_abort_backup()
which was called when a non-exclusive backup was canceled.
do_pg_abort_backup() assumes that there is at least one non-exclusive
backup running when it's called. But pg_stop_backup() can be canceled
even after it marks the end of non-exclusive backup (e.g.,
during waiting for WAL archiving). This broke the assumption that
do_pg_abort_backup() relies on, and which caused an assertion failure.
This commit changes do_pg_abort_backup() so that it does nothing
when non-exclusive backup has been already marked as completed.
That is, the asssumption is also changed, and do_pg_abort_backup()
now can handle even the case where it's called when there is
no running backup.
Backpatch to 9.6 where SQL-callable non-exclusive backup was added.
Author: Masahiko Sawada and Michael Paquier
Reviewed-By: Robert Haas and Fujii Masao
Discussion: https://www.postgresql.org/message-id/CAD21AoD2L1Fu2c==gnVASMyFAAaq3y-AQ2uEVj-zTCGFFjvmDg@mail.gmail.com
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es_query_dsa turns out to be broken by design, because it supposes
that there is only one DSA for the whole query, whereas there is
actually one per Gather (Merge) node. For now, work around that
problem by setting and clearing the pointer around the sections of
code that might need it. It's probably a better idea to get rid of
es_query_dsa altogether in favor of having each node keep track
individually of which DSA is relevant, but that seems like more than
we would want to back-patch.
Thomas Munro, reviewed and tested by Andreas Seltenreich, Amit
Kapila, and by me.
Discussion: http://postgr.es/m/CAEepm=1U6as=brnVvMNixEV2tpi8NuyQoTmO8Qef0-VV+=7MDA@mail.gmail.com
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Author: David Rowley
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Compilers that don't know that ereport(ERROR) doesn't return
complained about the new coding in scanint8() introduced by
commit 101c7ee3e. Tweak coding to avoid the warning.
Per buildfarm.
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Don't write to stdin of a psql process that could have already exited
with an authentication failure. Buildfarm members crake and mandrill
have failed once by doing so. Ignore SIGPIPE in all TAP tests.
Back-patch to v10, where these tests were introduced.
Reviewed by Michael Paquier.
Discussion: https://postgr.es/m/20171209210203.GC3362632@rfd.leadboat.com
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Fix a couple of minor oversights in commit 632b03da3: the tests
should be run in database "pl_regression" like the other PLs do,
and we should clean up the tests' output cruft during "make clean".
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