== PostgreSQL Weekly News - March 05 2017 ==

== PostgreSQL Weekly News - March 05 2017 ==

== PostgreSQL Product News ==

pgpoolAdmin 3.6.0, an administration tool for pgpool, released.
http://pgpool.net/mediawiki/index.php/Downloads

psycopg2 2.7, a Python connector for PostgreSQL, released.
http://initd.org/psycopg/docs/news.html#what-s-new-in-psycopg-2-7

== PostgreSQL Jobs for March ==

http://archives.postgresql.org/pgsql-jobs/2017-03/

== PostgreSQL Local ==

PgConf.Russia 2017 will take place on 15-17 March 2017 in Moscow.
https://pgconf.ru/en

PGDay Asia 2017 will be held March 17-18 in Singapore.
http://2017.pgday.asia/

Nordic PGDay 2017 will be held in Stockholm, Sweden, at the Sheraton
Hotel, on March 21, 2017.
https://2017.nordicpgday.org/

pgDay Paris 2017 will be held in Paris, France on March 23, 2017.
http://2017.pgday.paris/

PGConf US 2017 will be on March 28-31 in Jersey City, New Jersey.
http://www.pgconf.us/2017/

PGCon 2017 will take place in Ottawa on 23-26 May.
http://www.pgcon.org/2017/papers.php

Postgres Vision will take place in Boston, June 26 - 28, 2017.
http://postgresvision.com/

Swiss PGDay in Rapperswil will take place June 30, 2017.
The CfP is open through April 14, 2017.
http://www.pgday.ch/2017/

== PostgreSQL in the News ==

Planet PostgreSQL: http://planet.postgresql.org/

PostgreSQL Weekly News is brought to you this week by David Fetter

Submit news and announcements by Sunday at 3:00pm Pacific time.
Please send English language ones to david(at)fetter(dot)org, German language
to pwn(at)pgug(dot)de, Italian language to pwn(at)itpug(dot)org(dot)

== Applied Patches ==

Andres Freund pushed:

- Add "Slab" MemoryContext implementation for efficient equal-sized allocations.
The default general purpose aset.c style memory context is not a great choice
for allocations that are all going to be evenly sized, especially when those
objects aren't small, and have varying lifetimes. There tends to be a lot of
fragmentation, larger allocations always directly go to libc rather than have
their cost amortized over several pallocs. These problems lead to the
introduction of ad-hoc slab allocators in reorderbuffer.c. But it turns out
that the simplistic implementation leads to problems when a lot of objects are
allocated and freed, as aset.c is still the underlying implementation.
Especially freeing can easily run into O(n^2) behavior in aset.c. While the
O(n^2) behavior in aset.c can, and probably will, be addressed, custom
allocators for this behavior are more efficient both in space and time. This
allocator is for evenly sized allocations, and supports both cheap allocations
and freeing, without fragmenting significantly. It does so by allocating
evenly sized blocks via malloc(), and carves them into chunks that can be used
for allocations. In order to release blocks to the OS as early as possible,
chunks are allocated from the fullest block that still has free objects,
increasing the likelihood of a block being entirely unused. A subsequent
commit uses this in reorderbuffer.c, but a further allocator is needed to
resolve the performance problems triggering this work. There likely are
further potentialy uses of this allocator besides reorderbuffer.c. There's
potential further optimizations of the new slab.c, in particular the array of
freelists could be replaced by a more intelligent structure - but for now this
looks more than good enough. Author: Tomas Vondra, editorialized by Andres
Freund Reviewed-By: Andres Freund, Petr Jelinek, Robert Haas, Jim Nasby
Discussion:
https://postgr.es/m/d15dff83-0b37-28ed-0809-95a5cc7292ad@2ndquadrant.com
http://git.postgresql.org/pg/commitdiff/58b25e98106dbe062cec0f3d31d64977bffaa4af

- Use the new "Slab" context for some allocations in reorderbuffer.h. Note that
this change alone does not yet fully address the performance problems
triggering this work, a large portion of the slowdown is triggered by the
tuple allocator, which isn't converted to the new allocator. It would be
possible to do so, but using evenly sized objects, like both the current
implementation in reorderbuffer.c and slab.c, wastes a fair amount of memory.
A later patch by Tomas will introduce a better approach. Author: Tomas Vondra
Reviewed-By: Andres Freund Discussion:
https://postgr.es/m/d15dff83-0b37-28ed-0809-95a5cc7292ad@2ndquadrant.com
http://git.postgresql.org/pg/commitdiff/9fab40ad32efa4038d19eaed975bb4c1713ccbc0

- Make useful infrastructure from aset.c generally available. An upcoming patch
introduces a new type of memory context. To avoid duplicating debugging
infrastructure within aset.c, move useful pieces to memdebug.[ch]. While
touching aset.c, fix printf format code in AllocFree* debug macros. Author:
Tomas Vondra Reviewed-By: Andres Freund Discussion:
https://postgr.es/m/b3b2245c-b37a-e1e5-ebc4-857c914bc747@2ndquadrant.com
http://git.postgresql.org/pg/commitdiff/bfd12cccbd72c1846bfa3e4031155c9bd479d70a

- Overhaul memory management README. The README was written as a "historical
account", and that style hasn't aged particularly well. Rephrase it to
describe the current situation, instead of having various version specific
comments. This also updates the description of how allocated chunks are
associated with their corresponding context, the method of which has changed
in the preceding commit. Author: Andres Freund Discussion:
https://postgr.es/m/20170228074420.aazv4iw6k562mnxg@alap3.anarazel.de
http://git.postgresql.org/pg/commitdiff/f4e2d50cd7483a068c0a32e56b2d40f980cdea72

- Reduce size of common allocation header. The new slab allocator needs
different per-allocation information than the classical aset.c. The
definition in 58b25e981 wasn't sufficiently careful on 32 platforms with 8
byte alignment, leading to buildfarm failures. That's not entirely easy to
fix by just adjusting the definition. As slab.c doesn't actually need the
size part(s) of the common header, all chunks are equally sized after all, it
seems better to instead reduce the header to the part needed by all
allocators, namely which context an allocation belongs to. That has the
advantage of reducing the overhead of slab allocations, and also allows for
more flexibility in future allocators. To avoid spreading the logic about
accessing a chunk's context around, centralize it in GetMemoryChunkContext(),
which allows to delete a good number of lines. A followup commit will revise
the mmgr/README portion about StandardChunkHeader, and more. Author: Andres
Freund Discussion:
https://postgr.es/m/20170228074420.aazv4iw6k562mnxg@alap3.anarazel.de
http://git.postgresql.org/pg/commitdiff/7e3aa03b418d604d33040ed8fb866857dae82a02

- Fix assertion failure due to over-eager code deduplication. In the previous
commit I'd made MemoryContextContains() use GetMemoryChunkContext(), but that
causes trouble when the passed pointer isn't allocated in any memory context -
that's probably something we shouldn't do, but the previous commit isn't a
place for a "policy" change.
http://git.postgresql.org/pg/commitdiff/123ccbe58309d08e42009e99a4b34a3a1aef7798

- Fix s/ITERTOR/ITERATOR/ typo in simplehash.h. This could lead to problem when
simplehash.h is used to define two different types of hashtable visible in the
same translation unit. Reported-By: Josh Soref Discussion:
https://postgr.es/m/CACZqfqCC7WdBAY=rQePb9-qW1rjdaTdHsV5KoVejHkDb6qrtOg@mail.gmail.com
http://git.postgresql.org/pg/commitdiff/8f7277dfb5e703a034dbce7b155d998e577a6bc3

- Fix two recently introduced grammar errors in mmgr/README. These were
introduced by me in f4e2d50c. Reported-By: Tomas Vondra Discussion:
https://postgr.es/m/11adca69-be28-44bc-a801-64e6d53851e3@2ndquadrant.com
http://git.postgresql.org/pg/commitdiff/1309375e706440e1e2fe2a5bb74effbc639261ef

Peter Eisentraut pushed:

- chomp PQerrorMessage() in backend uses. PQerrorMessage() returns an error
message with a trailing newline, but in backend use (dblink, postgres_fdw,
libpqwalreceiver), we want to have the error message without that for emitting
via ereport(). To simplify that, add a function pchomp() that returns a
pstrdup'ed string with the trailing newline characters removed.
http://git.postgresql.org/pg/commitdiff/2ed193c904679a533d5e26a27c97119793bcae52

- Use proper enum constants for LockWaitPolicy.
http://git.postgresql.org/pg/commitdiff/eb75f4fced77e108393f18425ec3f7aba2e70a9d

- psql: Add tab completion for DEALLOCATE. EXECUTE already tab-completes the
list of prepared statements, but DEALLOCATE was missing. From: Dagfinn Ilmari
Mannsåker <ilmari(at)ilmari(dot)org>
http://git.postgresql.org/pg/commitdiff/b5a388392dab4c4a7c0fbd6cd0ad7421eabfc5cf

- Move atooid() definition to a central place.
http://git.postgresql.org/pg/commitdiff/788af6f8541d5f30acec540e4fd3cb24f5347209

- Collect duplicate copies of oid_cmp().
http://git.postgresql.org/pg/commitdiff/20f6d74242b3c9c84924e890248d027d30283e21

- Fix naming inconsistency. subobjid -> objsubid From: Jim Nasby
<Jim(dot)Nasby(at)BlueTreble(dot)com>
http://git.postgresql.org/pg/commitdiff/005638e9886aeedeeef933bdbd123d928053d390

- Fix timeouts in PostgresNode::psql. Newer Perl or IPC::Run versions default
to appending the filename to string exceptions, e.g. the exception psql timed
out is thrown as psql timed out at /usr/share/perl5/vendor_perl/IPC/Run.pm
line 2961. To handle this, match exceptions with !~ rather than ne. From:
Craig Ringer <craig(at)2ndquadrant(dot)com> Reviewed-by: Dagfinn Ilmari Mannsåker
<ilmari(at)ilmari(dot)org>
http://git.postgresql.org/pg/commitdiff/231f48796bcf2976f19122b8c6e12f50b463f94e

- Correct old release note item.
http://git.postgresql.org/pg/commitdiff/be6ed6451c693d9121d357996cbc21b06058b9c1

- Use asynchronous connect API in libpqwalreceiver. This makes the connection
attempt from CREATE SUBSCRIPTION and from WalReceiver interruptable by the
user in case the libpq connection is hanging. The previous coding required
immediate shutdown (SIGQUIT) of PostgreSQL in that situation. From: Petr
Jelinek <petr(dot)jelinek(at)2ndquadrant(dot)com> Tested-by: Thom Brown <thom(at)linux(dot)com>
http://git.postgresql.org/pg/commitdiff/1e8a850094478a2036891fa3d4ce769bce411ee3

- Fix after trigger execution in logical replication. From: Petr Jelinek
<petr(dot)jelinek(at)2ndquadrant(dot)com> Tested-by: Thom Brown <thom(at)linux(dot)com>
http://git.postgresql.org/pg/commitdiff/713f7c47d9c38654adbc36c47fd9e439f0d1f715

- Add RENAME support for PUBLICATIONs and SUBSCRIPTIONs. From: Petr Jelinek
<petr(dot)jelinek(at)2ndquadrant(dot)com>
http://git.postgresql.org/pg/commitdiff/6da9759a03d6d985c3b95a3177bbda7bcffd0ae6

- psql: Add tab completion for logical replication. Add tab completion for
publications and subscriptions. Also, to be able to get a list of
subscriptions, make pg_subscription world-readable but revoke access to
subconninfo using column privileges. From: Michael Paquier
<michael(dot)paquier(at)gmail(dot)com>
http://git.postgresql.org/pg/commitdiff/6f236e1eb8c7601bded96fd96244d676e95b8c26

- doc: Put callouts in SQL comments. This makes copy-and-pasting the SQL code
easier. From: Thomas Munro <thomas(dot)munro(at)enterprisedb(dot)com>
http://git.postgresql.org/pg/commitdiff/47b55d4174fd5662cd2f8c40852a20eec5f07c8f

- Fix typo.
http://git.postgresql.org/pg/commitdiff/2357c12b4988b4d30c1e2e813e438424546eaa88

- Fix parsing of DROP SUBSCRIPTION ... DROP SLOT. It didn't actually parse
before. Reported-by: Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>
http://git.postgresql.org/pg/commitdiff/347302730dc3092143ccbc1c29b47ac3354f924b

- Disallow CREATE/DROP SUBSCRIPTION in transaction block. Disallow CREATE
SUBSCRIPTION and DROP SUBSCRIPTION in a transaction block when the replication
slot is to be created or dropped, since that cannot be rolled back. based on
patch by Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com> == Pending Patches ==

- pg_dump: Fix ordering. Materialized views refresh should be last. From: Jim
Nasby <Jim(dot)Nasby(at)BlueTreble(dot)com>
http://git.postgresql.org/pg/commitdiff/d77ff69341f20db348ba2a4b29c522a93ac8e901

Tom Lane pushed:

- Remove PL/Tcl's "module" facility. PL/Tcl has long had a facility whereby Tcl
code could be autoloaded from a database table named "pltcl_modules".
However, nobody is using it, as evidenced by the recent discovery that it's
never been fixed to work with standard_conforming_strings turned on.
Moreover, it's rather shaky from a security standpoint, and the table design
is very old and crufty (partly because it dates from before we had TOAST). A
final problem is that because the table-population scripts depend on the Tcl
client library Pgtcl, which we removed from the core distribution in 2004,
it's impossible to create a self-contained regression test for the feature.
Rather than try to surmount these problems, let's just remove it. A follow-on
patch will provide a way to execute user-defined initialization code, similar
to features that exist in plperl and plv8. With that, it will be possible to
implement this feature or similar ones entirely in userspace, which is where
it belongs. Discussion: https://postgr.es/m/22067.1488046447@sss.pgh.pa.us
http://git.postgresql.org/pg/commitdiff/817f2a586342767d3289a320bb1dac5dcbb76979

- Allow index AMs to return either HeapTuple or IndexTuple format during IOS.
Previously, only IndexTuple format was supported for the output data of an
index-only scan. This is fine for btree, which is just returning a verbatim
index tuple anyway. It's not so fine for SP-GiST, which can return
reconstructed data that's much larger than a page. To fix, extend the index
AM API so that index-only scan data can be returned in either HeapTuple or
IndexTuple format. There's other ways we could have done it, but this way
avoids an API break for index AMs that aren't concerned with the issue, and it
costs little except a couple more fields in IndexScanDescs. I changed both
GiST and SP-GiST to use the HeapTuple method. I'm not very clear on whether
GiST can reconstruct data that's too large for an IndexTuple, but that seems
possible, and it's not much of a code change to fix. Per a complaint from Vik
Fearing. Reviewed by Jason Li. Discussion:
https://postgr.es/m/49527f79-530d-0bfe-3dad-d183596afa92@2ndquadrant.fr
http://git.postgresql.org/pg/commitdiff/9b88f27cb42fe8ff59ddc75e29c005624b8850a2

- Update documentation of tsquery_phrase(). Missed in commit 028350f61. Noted
by Eiji Seki.
http://git.postgresql.org/pg/commitdiff/d99706ed5178d7f37ac322e02e8c56e4e5e0e99a

- In rebuild_relation(), don't access an already-closed relcache entry. This
reliably fails with -DRELCACHE_FORCE_RELEASE, as reported by Andrew Dunstan,
and could sometimes fail in normal operation, resulting in a wrong persistence
value being used for the transient table. It's not immediately clear to me
what effects that might have beyond the risk of a crash while accessing
OldHeap->rd_rel->relpersistence, but it's probably not good. Bug introduced
by commit f41872d0c, and made substantially worse by commit 85b506bbf, which
added a second such access significantly later than the heap_close. I doubt
the first reference could fail in a production scenario, but the second one
definitely could. Discussion:
https://postgr.es/m/7b52f900-0579-cda9-ae2e-de5da17090e6@2ndQuadrant.com
http://git.postgresql.org/pg/commitdiff/dbca84f04ed5debe748029699aa44fa86beca32d

Robert Haas pushed:

- hash: Refactor bucket squeeze code. In preparation for adding write-ahead
logging to hash indexes, refactor _hash_freeovflpage and _hash_squeezebucket
so that all related page modifications happen in a single section of code.
The previous coding assumed that it would be fine to move tuples one at a
time, and also that the various operations involved in freeing an overflow
page didn't necessarily all need to be done together, all of which is true if
you don't care about write-ahead logging. Amit Kapila, with slight changes by
me.
http://git.postgresql.org/pg/commitdiff/b0f18cb77f50a54e997d857d592f6a511617f52c

- hash: Refactor overflow page allocation. As with commit
b0f18cb77f50a54e997d857d592f6a511617f52c, the goal here is to move all of the
related page modifications to a single section of code, in preparation for
adding write-ahead logging. Amit Kapila, with slight changes by me. The
larger patch series of which this is a part has been reviewed and tested by
Álvaro Herrera, Ashutosh Sharma, Mark Kirkwood, Jeff Janes, and Jesper
Pedersen, all of whom should also have been credited in the previous commit
message.
http://git.postgresql.org/pg/commitdiff/30df93f698d016d086e8961aa6c6076b37ea0ef4

- hash: Refactor and clean up bucket split code. As with commit
30df93f698d016d086e8961aa6c6076b37ea0ef4 and commit
b0f18cb77f50a54e997d857d592f6a511617f52c, the goal here is to move all of the
related page modifications to a single section of code, in preparation for
adding write-ahead logging. Amit Kapila, with slight changes by me. The
larger patch series of which this is a part has been reviewed and tested by
Álvaro Herrera, Ashutosh Sharma, Mark Kirkwood, Jeff Janes, and Jesper
Pedersen.
http://git.postgresql.org/pg/commitdiff/21a3cf41284c08307ef9abe3400be5dc53723519

- Update comments overlooked by 2f5c9d9c9cec436e55847ec580606d7e88067df6. Tomas
Vondra
http://git.postgresql.org/pg/commitdiff/fa42b2005f0cd825fe5a5fd4db93a7c30b5fe883

- Don't uselessly rewrite, truncate, VACUUM, or ANALYZE partitioned tables.
Also, recursively perform VACUUM and ANALYZE on partitions when the command is
applied to a partitioned table. In passing, some related documentation
updates. Amit Langote, reviewed by Michael Paquier, Ashutosh Bapat, and by
me. Discussion:
http://postgr.es/m/47288cf1-f72c-dfc2-5ff0-4af962ae5c1b@lab.ntt.co.jp
http://git.postgresql.org/pg/commitdiff/3c3bb99330aa9b4c2f6258bfa0265d806bf365c3

- Refactor bitmap heap scan in preparation for parallel support. The final
patch will be less messy if the prefetching support is a bit better isolated,
so do that. Dilip Kumar, with some changes by me. The larger patch set of
which this is a part has been reviewed and tested by (at least) Andres Freund,
Amit Khandekar, Tushar Ahuja, Rafia Sabih, Haribabu Kommi, and Thomas Munro.
http://git.postgresql.org/pg/commitdiff/9e0fe09fc5dc1135479b532d1806e28cbc5a35aa

- Improve error reporting for tuple-routing failures. Currently, the whole row
is shown without column names. Instead, adopt a style similar to
_bt_check_unique() in ExecFindPartition() and show the failing key: (key1,
...) = (val1, ...). Amit Langote, per a complaint from Simon Riggs. Reviewed
by me; I also adjusted the grammar in one of the comments. Discussion:
http://postgr.es/m/9f9dc7ae-14f0-4a25-5485-964d9bfc19bd@lab.ntt.co.jp
http://git.postgresql.org/pg/commitdiff/5a73e17317e91912b2755f7960d5bf31d374cf31

- Notify bgworker registrant after freeing worker slot. Tom Lane observed
buildfarm failures caused by the select_parallel regression test trying to
launch new parallel queries before the worker slots used by the previous ones
were freed. Try to fix this by having the postmaster free the worker slots
before it sends the SIGUSR1 notifications to the registering process. This
doesn't completely eliminate the possibility that the user backend might
(correctly) observe the worker as dead before the slot is free, but I believe
it should make the window significantly narrower. Patch by me, per complaint
from Tom Lane. Reviewed by Amit Kapila. Discussion:
http://postgr.es/m/30673.1487310734@sss.pgh.pa.us
http://git.postgresql.org/pg/commitdiff/aea5d298362e881b13d95a48c5ae116879237389

- Add pg_current_logfile() function. The syslogger will write out the current
stderr and csvlog names, if it's running and there are any, to a new file in
the data directory called "current_logfiles". We take care to remove this
file when it might no longer be valid (but not at shutdown). The function
pg_current_logfile() can be used to read the entries in the file. Gilles
Darold, reviewed and modified by Karl O. Pinc, Michael Paquier, and me.
Further review by Álvaro Herrera and Christoph Berg.
http://git.postgresql.org/pg/commitdiff/19dc233c32f2900e57b8da4f41c0f662ab42e080

Magnus Hagander pushed:

- Fix incorrect variable datatype. Both datatypes map to the same underlying
one which is why it still worked, but we should use the correct type. Author:
Kyotaro HORIGUCHI
http://git.postgresql.org/pg/commitdiff/016c9908347ed2ba7b9d7101c858ea7730b6c0b0

Álvaro Herrera pushed:

- Create <sect3> in the functions-xml section. This is a small change so that a
new XMLTABLE sect3 can be added easily later. Author: Craig Ringer
Discussion:
https://postgr.es/m/CAFj8pRAgfzMD-LoSmnMGybD0WsEznLHWap8DO79+-GTRAPR4qA@mail.gmail.com
http://git.postgresql.org/pg/commitdiff/4461a9bfd1ac4aa1f922e8309e79d097bde9fcb4

Noah Misch pushed:

- Handle unaligned SerializeSnapshot() buffer. Likewise in RestoreSnapshot().
Do so by copying between the user buffer and a stack buffer of known
alignment. Back-patch to 9.6, where this last applies cleanly. In master,
the select_parallel test dies with SIGBUS on "Oracle Solaris 10 1/13
s10s_u11wos_24a SPARC", building 32-bit with gcc 4.9.2. In 9.6 and 9.5, the
buffers in question happen to be sufficiently-aligned, and this change is mere
insurance against future 9.6 changes or extension code compromising that.
http://git.postgresql.org/pg/commitdiff/7f3112135eb67e5df56cd34b8ce662bf6a2390e9

Simon Riggs pushed:

- Allow vacuums to report oldestxmin. Allow VACUUM and Autovacuum to report the
oldestxmin value they used while cleaning tables, helping to make better sense
out of the other statistics we report in various cases.
http://git.postgresql.org/pg/commitdiff/9eb344faf54a849898d9be012ddfa8204cfeb57c

== Pending Patches ==

Thomas Munro sent in two revisions of a patch to add a test for SSI SLRU
wraparound.

Beena Emerson sent in another revision of a patch to allow setting the default
WAL segment size at initdb time.

Kyotaro HORIGUCHI and Peter Eisentraut traded patches to fix an issue in the
logical replication protocol.

Amit Langote sent in a patch to allow dropping declaratively partitioned table
without CASCADE.

Noah Misch sent in a patch to use wrappers of PG_DETOAST_DATUM_PACKED() more.

Etsuro Fujita sent in a patch to add support for parameterized foreign joins.

Dagfinn Ilmari Mannsåker sent in a patch to add
max_pred_locks_per_{relation,page} reloptions.

Alexander Korotkov sent in another revision of a patch to add incremental sort.

Haribabu Kommi sent in another revision of a patch to add infrastructure which
will be used to parallelize DML and utility commands.

Pavan Deolasee sent in another revision of a patch to implement WARM.

Álvaro Herrera sent in a patch to make a BRIN page range unsummarized.

Andrew Dunstan sent in another revision of a patch to enable tree_gin and
btree_gist for enums.

Simon Riggs sent in a patch to reduce the amount of bloat resulting from running
CREATE INDEX CONCURRENTLY by destroying the snapshot taken in the first phase,
before entering the second phase.

Kyotaro HORIGUCHI sent in a patch to make slotSegNo a XLogSegNo, which it
already should have been.

Daisuke Higuchi sent in a patch to enable walsender for async to wait until
walsender for sync confirms that WAL is written to disk, controlled by a new
boolean GUC, async_walsender_delay.

Robert Haas, Amit Langote, and Ashutosh Bapat traded patches to fix an
infelicity between declaratively partitioned tables and relfilenode.

Kyotaro HORIGUCHI sent in two more revisions of a patch to implement character
conversion with a radix tree.

Takayuki Tsunakawa sent in a PoC patch to implement statement-level ROLLBACK.

Kyotaro HORIGUCHI sent in a patch to add WAL relief vent for replication slots.

Surafel Temesgen sent in a patch to disallow multiple queries per PQexec().

Tom Lane sent in two revisions of a patch to remove PL/Tcl's unused modules
infrastructure.

Kuntal Ghosh sent in a patch to implement WAL consistency checking for hash
indexes.

David Steele sent in two revisions of a patch to make pg_stop_backup() archive
wait optional.

Dmitry Dolgov sent in a patch to add some full text search functions for JSONB.

Etsuro Fujita sent in a patch to the PostgreSQL FDW to enable evaluating
placeholdervars on the remote server.

Simon Riggs sent in a patch to avoid bloat in CREATE INDEX CONCURRENTLY.

Dmitry Dolgov sent in another revision of a patch to implement generic type
subscripting.

David Steele sent in a patch to implement a configurable file mode mask.

Haribabu Kommi sent in a patch to refactor the handling of database attributes
between pg_dump and pg_dumpall.

Peter Eisentraut sent in another revision of a patch to implement IDENTITY
columns.

Peter Eisentraut sent in another revision of a patch to implement background
sessions.

Peter Eisentraut sent in a patch to use the SQL standard error code for nextval.

Peter Eisentraut sent in another revision of a patch to cast result of
copyObject() to the correct type.

Venkata B Nagothi sent in two more revisions of a patch to add
recovery_start_point and recovery_incomplete.

Amit Kapila sent in another revision of a patch to add WAL logging for hash
indexes.

Peter Moser sent in another revision of a patch to add temporal query processing
with range types.

Peter Eisentraut sent in another revision of a patch to do some of the
infrastructure for making PostgreSQL's source C++-compatible.

Peter Eisentraut sent in a patch to refactor dblink, replacing some macros with
static functions.

Peter Eisentraut sent in a patch to make much of the Perl code perlcritic-clean.

Andres Freund sent in a patch to move contrib/seg to only use V1 calling
conventions and remove support for version-0 calling conventions.

KaiGai Kohei sent in two more revisions of a patch to add a PassDownLimitBound
for ForeignScan/CustomScan.

Tomas Vondra sent in a patch to update comments about CatalogUpdateIndexes.

Dilip Kumar sent in another revision of a patch to implement parallel bitmap
heap scan.

Jim Nasby sent in another revision of a patch to add SPI_execute_callback() and
callback-based DestReceiver and minimally use same in PL/PythonU.

Álvaro Herrera sent in a patch to add autovacuum work items for BRIN
summarization.

Brandur Leach sent in another revision of a patch to add SortSupport for the
macaddr type.

Rahila Syed sent in a patch to add support for default partition in
declarative partitioning.

Peter Eisentraut sent in another revision of a patch to enable referring to
functions without arguments when the name is unique.

Corey Huinker sent in three more revisions of a patch to implement \if and
friends in psql.

Yugo Nagata and Amul Sul traded different implementations of patches to
implement hash partitioning for declaratively partitioned tables.

Vinayak Pokale sent in a patch to add a progress checker for ANALYZE.

Oleg Bartunov sent in a patch to implement SQL/JSON.

Pavan Deolasee sent in a patch to skip all-visible pages during second HeapScan
of CREATE INDEX CONCURRENTLY.

Andres Freund sent in a patch to make simplehash.h grow hashtable in additional
cases.

Dilip Kumar and Robert Haas traded patches to implement parallel merge join.

Lucas Fitti sent in a patch to use $ parameters as replacement characters for
pg_stat_statements.

Jan Michálek sent in two more revisions of a patch to implement markdown, rst
and mediawiki output formats in psql.

Andreas Karlsson sent in another revision of a patch to implement REINDEX
CONCURRENTLY.

Anastasia Lubennikova sent in another revision of a patch to add covering +
unique indexes.

Álvaro Herrera sent in another revision of a patch to improve BRIN cost
estimates.

Dagfinn Ilmari Mannsåker sent in a patch to address all the ## no critic
annotations except RequireFilenameMatchesPackage.

David Rowley sent in a patch to improve performance of replay of
AccessExclusiveLock.

Ashutosh Bapat sent in two more revisions of a patch to improve partition-wise
join between declaratively partitioned tables.

Michaël Paquier sent in two more revisions of a patch to implement SCRAM
authentication.

Álvaro Herrera sent in another revision of a patch to optimize memory allocation
in the 'bringetbitmap' function.

Tomas Vondra sent in two more revisions of a patch to implement extended
statistics, formerly multivariate statistics.

Jim Mlodgenski sent in two revisions of a patch to track stats for materialized
views.

Thomas Munro sent in another revision of a patch to measure replay lag.

Petr Jelínek sent in another revision of a patch to reserve global xmin for
create slot snasphot export, not use on disk snapshots for snapshot export in
logical decoding, prevent snapshot builder xmin from going backwards, fix
xl_running_xacts usage in snapshot builder, and skip unnecessary snapshot
builds.

Amit Langote sent in another revision of a patch to improve the documents for
partitioning.

Ronan Dunklau sent in a patch to fix mergeappend costsort estimates.

Masahiko Sawada sent in a patch to implement 2PC in ECPG.

Rushabh Lathia sent in a patch to print the correct startup cost for the group
aggregate.

Álvaro Herrera and Pavel Stěhule traded patches to implement xmltable().

Kyotaro HORIGUCHI sent in a patch to remove NamedLWLockTrancheArray.

Petr Jelínek sent in a patch to reorder the asynchronous libpq calls for
replication connection.

Tomas Vondra sent in another revision of a patch to add page_checksum and
bt_page_items(bytea).

Ashutosh Sharma sent in another revision of a patch to fix an issue where
parallel seq. plan was not coming against inheritance or partition table.

David Rowley sent in a patch to fix an issue where foreign join pushdowns not
working properly for outer joins.