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SUSv3 <netinet/in.h> defines struct sockaddr_in6, and all targeted Unix
systems have it. Windows has it in <ws2ipdef.h>. Remove the configure
probe, the macro and a small amount of dead code.
Also remove a mention of IPv6-less builds from the documentation, since
there aren't any.
This is similar to commits f5580882 and 077bf2f2 for Unix sockets. Even
though AF_INET6 is an "optional" component of SUSv3, there are no known
modern operating system without it, and it seems even less likely to be
omitted from future systems than AF_UNIX.
Reviewed-by: Andres Freund <andres@anarazel.de>
Discussion: https://postgr.es/m/CA+hUKGKErNfhmvb_H0UprEmp4LPzGN06yR2_0tYikjzB-2ECMw@mail.gmail.com
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Further reduce -Wshadow=compatible-local warnings by 1 by refactoring the
code in gistRelocateBuildBuffersOnSplit() to make use of
foreach_current_index() instead of manually incrementing a variable on
each loop.
Author: David Rowley
Discussion: https://postgr.es/m/CAApHDvpGZX-X=Bn4moyXgfFa0CdSUwoa04d3isit3=1qo8F8Bw@mail.gmail.com
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In a similar effort to f01592f91, here we're targetting fixing the
warnings where we've deemed the shadowing variable to serve a close enough
purpose to the shadowed variable just to reuse the shadowed version and
not declare the shadowing variable at all.
By my count, this takes the warning count from 106 down to 71.
Author: Justin Pryzby
Discussion: https://postgr.es/m/20220825020839.GT2342@telsasoft.com
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The GRANT statement can now specify WITH INHERIT TRUE or WITH
INHERIT FALSE to control whether the member inherits the granted
role's permissions. For symmetry, you can now likewise write
WITH ADMIN TRUE or WITH ADMIN FALSE to turn ADMIN OPTION on or off.
If a GRANT does not specify WITH INHERIT, the behavior based on
whether the member role is marked INHERIT or NOINHERIT. This means
that if all roles are marked INHERIT or NOINHERIT before any role
grants are performed, the behavior is identical to what we had before;
otherwise, it's different, because ALTER ROLE [NO]INHERIT now only
changes the default behavior of future grants, and has no effect on
existing ones.
Patch by me. Reviewed and testing by Nathan Bossart and Tushar Ahuja,
with design-level comments from various others.
Discussion: http://postgr.es/m/CA+Tgmoa5Sf4PiWrfxA=sGzDKg0Ojo3dADw=wAHOhR9dggV=RmQ@mail.gmail.com
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Apparently I missed that this SUBSYS.o rule isn't needed anymore in
a4ebbd27527, likely because there still is a reference to it due to AIX - but
that's self contained in src/backend/Makefile
Discussion: https://postgr.es/m/20220820174213.d574qde4ptwdzoqz@awork3.anarazel.de
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Discussion: https://postgr.es/m/20220820174213.d574qde4ptwdzoqz@awork3.anarazel.de
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This is preparatory work for a project to increase the number of bits
in a RelFileNumber from 32 to 56.
Along the way, introduce static inline accessor functions for a couple
of BufferTag fields.
Dilip Kumar, reviewed by me. The overall patch series has also had
review at various times from Andres Freund, Ashutosh Sharma, Hannu
Krosing, Vignesh C, Álvaro Herrera, and Tom Lane.
Discussion: http://postgr.es/m/CAFiTN-trubju5YbWAq-BSpZ90-Z6xCVBQE8BVqXqANOZAF1Znw@mail.gmail.com
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SplitToVariants() in the ispell code, lseg_inside_poly() in geo_ops.c,
and regex_selectivity_sub() in selectivity estimation could recurse
until stack overflow; fix by adding check_stack_depth() calls.
So could next() in the regex compiler, but that case is better fixed by
converting its tail recursion to a loop. (We probably get better code
that way too, since next() can now be inlined into its sole caller.)
There remains a reachable stack overrun in the Turkish stemmer, but
we'll need some advice from the Snowball people about how to fix that.
Per report from Egor Chindyaskin and Alexander Lakhin. These mistakes
are old, so back-patch to all supported branches.
Richard Guo and Tom Lane
Discussion: https://postgr.es/m/1661334672.728714027@f473.i.mail.ru
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The code took the LOCALE option as the default/fallback for
ICU_LOCALE, but this was neither documented nor intended, so remove
it. (It was probably left in from an earlier patch version.)
Reported-by: Marina Polyakova <m.polyakova@postgrespro.ru>
Discussion: https://www.postgresql.org/message-id/flat/f385ba25e7f8be427b8c582e5cca7d79%40postgrespro.ru#515a31c5429d6d37ad1d5c9d66962a1e
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This stuff should be already initialized at process startup, so adding
this extra step is confusing for no gain.
Per gripe from Tom Lane and Jacob Champion.
Discussion: https://postgr.es/m/bbf2b922-4ff7-5c30-e3ef-2a8bdcdd1116@timescale.com
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These should have been included in 421892a19 as these shadowed variable
warnings can also be fixed by adjusting the scope of the shadowed variable
to put the declaration for it in an inner scope.
This is part of the same effort as f01592f91.
By my count, this takes the warning count from 114 down to 106.
Author: David Rowley and Justin Pryzby
Discussion: https://postgr.es/m/CAApHDvrwLGBP%2BYw9vriayyf%3DXR4uPWP5jr6cQhP9au_kaDUhbA%40mail.gmail.com
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This commit moves authn_id into a new global structure called
ClientConnectionInfo (mapping to a MyClientConnectionInfo for each
backend) which is intended to hold all the client information that
should be shared between the backend and any of its parallel workers,
access for extensions and triggers being the primary use case. There is
no need to push all the data of Port to the workers, and authn_id is
quite a generic concept so using a separate structure provides the best
balance (the name of the structure has been suggested by Robert Haas).
While on it, and per discussion as this would be useful for a potential
SYSTEM_USER that can be accessed through parallel workers, a second
field is added for the authentication method, copied directly from
Port.
ClientConnectionInfo is serialized and restored using a new parallel
key and a structure tracks the length of the authn_id, making the
addition of more fields straight-forward.
Author: Jacob Champion
Reviewed-by: Bertrand Drouvot, Stephen Frost, Robert Haas, Tom Lane,
Michael Paquier, Julien Rouhaud
Discussion: https://postgr.es/m/793d990837ae5c06a558d58d62de9378ab525d83.camel@vmware.com
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In a similar effort to f01592f91, here we're targetting fixing the
warnings that -Wshadow=compatible-local produces that we can fix by moving
a variable to an inner scope to stop that variable from being shadowed by
another variable declared somewhere later in the function.
All of the warnings being fixed here are changing the scope of variables
which are being used as an iterator for a "for" loop. In each instance,
the fix happens to be changing the for loop to use the C99 type
initialization. Much of this code likely pre-dates our use of C99.
Reducing the scope of the outer scoped variable seems like the safest way
to fix these. Renaming seems more likely to risk patches using the wrong
variable. Reducing the scope is more likely to result in a compilation
failure after applying some future patch rather than introducing bugs with
it.
By my count, this takes the warning count from 129 down to 114.
Author: Justin Pryzby
Discussion: https://postgr.es/m/CAApHDvrwLGBP%2BYw9vriayyf%3DXR4uPWP5jr6cQhP9au_kaDUhbA%40mail.gmail.com
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I added this in commit 153f40067, out of paranoia about kernels
possibly rejecting very large listen backlog requests. However,
POSIX has said for decades that the kernel must silently reduce
any value it considers too large, and there's no evidence that
any current system doesn't obey that. Let's just drop this limit
and save some complication.
While we're here, compute the request as twice MaxConnections not
twice MaxBackends; the latter no longer means what it did in 2001.
Per discussion of a report from Kevin McKibbin.
Discussion: https://postgr.es/m/CADc_NKg2d+oZY9mg4DdQdoUcGzN2kOYXBu-3--RW_hEe0tUV=g@mail.gmail.com
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sysctl is more portable than Linux's /proc/sys file tree, and
often easier to use too. That's why most of our docs refer to
sysctl when talking about how to adjust kernel parameters.
Bring the few stragglers into line.
Discussion: https://postgr.es/m/361175.1661187463@sss.pgh.pa.us
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While decoding changes in a loop, if we skip all the changes there is no
CFI making the loop uninterruptible.
Reported-by: Whale Song and Andrey Borodin
Bug: 17580
Author: Masahiko Sawada
Reviwed-by: Amit Kapila
Backpatch-through: 10
Discussion: https://postgr.es/m/17580-849c1d5b6d7eb422@postgresql.org
Discussion: https://postgr.es/m/B319ECD6-9A28-4CDF-A8F4-3591E0BF2369@yandex-team.ru
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pgstat_report_stat() will be called before shutdown so an explicit call to
pgstat_report_wal() just before shutdown is redundant.
This likely was not redundant before 5891c7a8ed8, but now it clearly is.
Author: Melanie Plageman <melanieplageman@gmail.com>
Reviewed-by: Andres Freund <andres@anarazel.de>
Discussion: https://www.postgresql.org/message-id/CAAKRu_aaq33UnG4TXq3S-OSXGWj1QGf0sU%2BECH4tNwGFNERkZA%40mail.gmail.com
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All backends should have a BackendType to enable statistics reporting
per BackendType.
Add a new BackendType for standalone backends, B_STANDALONE_BACKEND (and
alphabetize the BackendTypes). Both the bootstrap backend and single
user mode backends will have BackendType B_STANDALONE_BACKEND.
Author: Melanie Plageman <melanieplageman@gmail.com>
Reviewed-by: Andres Freund <andres@anarazel.de>
Discussion: https://www.postgresql.org/message-id/CAAKRu_aaq33UnG4TXq3S-OSXGWj1QGf0sU%2BECH4tNwGFNERkZA%40mail.gmail.com
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Somewhere during the development of the patch acquiring a lock during read
access to variable-numbered stats got lost. The missing lock acquisition won't
cause corruption, but can lead to reading torn values when accessing
stats. Add the missing lock acquisitions.
Reported-by: Greg Stark <stark@mit.edu>
Reviewed-by: "Drouvot, Bertrand" <bdrouvot@amazon.com>
Reviewed-by: Andres Freund <andres@anarazel.de>
Author: Kyotaro Horiguchi <horikyota.ntt@gmail.com>
Discussion: https://postgr.es/m/CAM-w4HMYkM_DkYhWtUGV+qE_rrBxKOzOF0+5faozxO3vXrc9wA@mail.gmail.com
Backpatch: 15-
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Using %u with uint16 causes warnings with -Wformat-signedness. There are many
other warnings, but for now change only these since c920fe4818 already changed
the message string for most of them.
Per report from Peter Eisentraut
Discussion: https://www.postgresql.org/message-id/31e63649-0355-7088-831e-b07d5f908a8c%40enterprisedb.com
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Peter Smith
Discussion: https://www.postgresql.org/message-id/CAHut%2BPtRGVuj8Q_GpHHxZyk7fGwdYDG8_s4GSfKoc_4Yd9vR-w%40mail.gmail.com
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Previously, membership of role A in role B could be recorded in the
catalog tables only once. This meant that a new grant of role A to
role B would overwrite the previous grant. For other object types, a
new grant of permission on an object - in this case role A - exists
along side the existing grant provided that the grantor is different.
Either grant can be revoked independently of the other, and
permissions remain so long as at least one grant remains. Make role
grants work similarly.
Previously, when granting membership in a role, the superuser could
specify any role whatsoever as the grantor, but for other object types,
the grantor of record must be either the owner of the object, or a
role that currently has privileges to perform a similar GRANT.
Implement the same scheme for role grants, treating the bootstrap
superuser as the role owner since roles do not have owners. This means
that attempting to revoke a grant, or admin option on a grant, can now
fail if there are dependent privileges, and that CASCADE can be used
to revoke these. It also means that you can't grant ADMIN OPTION on
a role back to a user who granted it directly or indirectly to you,
similar to how you can't give WITH GRANT OPTION on a privilege back
to a role which granted it directly or indirectly to you.
Previously, only the superuser could specify GRANTED BY with a user
other than the current user. Relax that rule to allow the grantor
to be any role whose privileges the current user posseses. This
doesn't improve compatibility with what we do for other object types,
where support for GRANTED BY is entirely vestigial, but it makes this
feature more usable and seems to make sense to change at the same time
we're changing related behaviors.
Along the way, fix "ALTER GROUP group_name ADD USER user_name" to
require the same privileges as "GRANT group_name TO user_name".
Previously, CREATEROLE privileges were sufficient for either, but
only the former form was permissible with ADMIN OPTION on the role.
Now, either CREATEROLE or ADMIN OPTION on the role suffices for
either spelling.
Patch by me, reviewed by Stephen Frost.
Discussion: http://postgr.es/m/CA+TgmoaFr-RZeQ+WoQ5nKPv97oT9+aDgK_a5+qWHSgbDsMp1Vg@mail.gmail.com
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An assertion would fail when creating a database with libc locale
provider from a template database with icu locale provider.
Reported-by: Marina Polyakova <m.polyakova@postgrespro.ru>
Reviewed-by: Julien Rouhaud <rjuju123@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/f385ba25e7f8be427b8c582e5cca7d79%40postgrespro.ru#515a31c5429d6d37ad1d5c9d66962a1e
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As such the current usage of & won't produce incorrect results but it
would be better to use && to short-circuit the evaluation of second
condition when the same is not required.
Author: Ranier Vilela
Reviewed-by: Tom Lane, Bharath Rupireddy
Backpatch-through: 15, where it was introduced
Discussion: https://postgr.es/m/CAEudQApL8QcoYwQuutkWKY_h7gBY8F0Xs34YKfc7-G0i83K_pw@mail.gmail.com
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Compiling with -Wshadow=compatible-local yields quite a few warnings about
local variables being shadowed by compatible local variables in an inner
scope. Of course, this is perfectly valid in C, but we have had bugs in
the past as a result of developers failing to notice this. af7d270dd is a
recent example.
Here we do a cleanup of warnings we receive from -Wshadow=compatible-local
for code which is new to PostgreSQL 15. We've yet to have the discussion
about if we actually ever want to run that as a standard compilation flag.
We'll need to at least get the number of warnings down to something easier
to manage before we can realistically consider if we want this or not.
This commit is the first step towards reducing the warnings.
The changes being made here are all fairly trivial. Because of that, and
the fact that v15 is still in beta, this is being back-patched into 15.
It seems more risky not to do this as the risk of future bugs is increased
by the additional conflicts that this commit could cause for any future
bug fixes touching the same areas as this commit.
Author: Justin Pryzby
Discussion: https://postgr.es/m/20220817145434.GC26426%40telsasoft.com
Backpatch-through: 15
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Consistently avoid trusting a sample of only one page at the point that
VACUUM determines a new reltuples for the target table (though only when
the table is larger than a single page). This is follow-up work to
commit 74388a1a, which added a heuristic to prevent reltuples from
becoming distorted by successive VACUUM operations that each scan only a
single heap page (which was itself more or less a bugfix for an issue in
commit 44fa8488, which simplified VACUUM's handling of scanned pages).
The original bugfix commit did not account for certain remaining cases
that where not affected by its "2% of total relpages" heuristic. This
happened with relations that are small enough that just one of its pages
exceeded the 2% threshold, yet still big enough for VACUUM to deem
skipping most of its pages via the visibility map worthwhile. reltuples
could still become distorted over time with such a table, at least in
scenarios where the VACUUM command is run repeatedly and without the
table itself ever changing.
Author: Peter Geoghegan <pg@bowt.ie>
Discussion: https://postgr.es/m/CAH2-Wzk7d4m3oEbEWkWQKd+gz-eD_peBvdXVk1a_KBygXadFeg@mail.gmail.com
Backpatch: 15-, where the rules for scanned pages changed.
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Initialize shared memory allocated for index stats to avoid a hard
crash. This was possible when parallel VACUUM became confused about the
current phase of index processing.
Oversight in commit 8e1fae1938, which refactored parallel VACUUM.
Author: Masahiko Sawada <sawada.mshk@gmail.com>
Reported-By: Justin Pryzby <pryzby@telsasoft.com>
Discussion: https://postgr.es/m/20220818133406.GL26426@telsasoft.com
Backpatch: 15-, the first version with the refactoring commit.
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Previously, "GRANT foo TO bar" or "GRANT foo TO bar GRANTED BY baz"
would record the OID of the grantor in pg_auth_members.grantor, but
that role could later be dropped without modifying or removing the
pg_auth_members record. That's not great, because we typically try
to avoid dangling references in catalog data.
Now, a role grant depends on the grantor, and the grantor can't be
dropped without removing the grant or changing the grantor. "DROP
OWNED BY" will remove the grant, just as it does for other kinds of
privileges. "REASSIGN OWNED BY" will not, again just like what we do
in other cases involving privileges.
pg_auth_members now has an OID column, because that is needed in order
for dependencies to work. It also now has an index on the grantor
column, because otherwise dropping a role would require a sequential
scan of the entire table to see whether the role's OID is in use as
a grantor. That probably wouldn't be too large a problem in practice,
but it seems better to have an index just in case.
A follow-on patch is planned with the goal of more thoroughly
rationalizing the behavior of role grants. This patch is just trying
to do enough to make sure that the data we store in the catalogs is at
some basic level valid.
Patch by me, reviewed by Stephen Frost
Discussion: http://postgr.es/m/CA+TgmoaFr-RZeQ+WoQ5nKPv97oT9+aDgK_a5+qWHSgbDsMp1Vg@mail.gmail.com
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The present implementations of adjust_appendrel_attrs_multilevel and
its sibling adjust_child_relids_multilevel are very messy, because
they work by reconstructing the relids of the child's immediate
parent and then seeing if that's bms_equal to the relids of the
target parent. Aside from being quite inefficient, this will not
work with planned future changes to make joinrels' relid sets
contain outer-join relids in addition to baserels.
The whole thing can be solved at a stroke by adding explicit parent
and top_parent links to child RelOptInfos, and making these functions
work with RelOptInfo pointers instead of relids. Doing that is
simpler for most callers, too.
In my original version of this patch, I got rid of
RelOptInfo.top_parent_relids on the grounds that it was now redundant.
However, that adds a lot of code churn in places that otherwise would
not need changing, and arguably the extra indirection needed to fetch
top_parent->relids in those places costs something. So this version
leaves that field in place.
Discussion: https://postgr.es/m/553080.1657481916@sss.pgh.pa.us
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As written, if you use XLogBeginRead() to position an xlogreader at
the beginning of a WAL page and then try to read WAL, this assertion
will fail. However, the header comment for XLogBeginRead() claims
that positioning an xlogreader at the beginning of a page is valid,
and the code here is perfectly able to cope with it. It's only the
assertion that causes trouble. So relax it.
This is formally a bug in all supported branches, but as it doesn't
seem to have any consequences for current uses of the xlogreader
facility, no back-patch, at least for now.
Dilip Kumar and Robert Haas
Discussion: http://postgr.es/m/CA+TgmoaJSs2_7WHW2GzFYe9+zfPtxBKvT3GW47+x=ptUE=cULw@mail.gmail.com
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When creating a partitioned index, DefineIndex tries to identify
any existing indexes on the partitions that match the partitioned
index, so that it can absorb those as child indexes instead of
building new ones. Part of the matching is to compare IndexInfo
structs --- but that wasn't done quite right. We're comparing
the IndexInfo built within DefineIndex itself to one made from
existing catalog contents by BuildIndexInfo. Notably, while
BuildIndexInfo will run index expressions and predicates through
expression preprocessing, that has not happened to DefineIndex's
struct. The result is failure to match and subsequent creation
of duplicate indexes.
The easiest and most bulletproof fix is to build a new IndexInfo
using BuildIndexInfo, thereby guaranteeing that the processing done
is identical.
While here, let's also extract the opfamily and collation data
from the new partitioned index, removing ad-hoc logic that
duplicated knowledge about how those are constructed.
Per report from Christophe Pettus. Back-patch to v11 where
we invented partitioned indexes.
Richard Guo and Tom Lane
Discussion: https://postgr.es/m/8864BFAA-81FD-4BF9-8E06-7DEB8D4164ED@thebuild.com
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This should improve performance, and was suggested by Andres Freund.
Back-patch to v15 to keep the code consistent across branches.
Dilip Kumar
Discussion: http://postgr.es/m/C3458199-FEDD-4356-865A-08DFAA5D4065@anarazel.de
Discussion: http://postgr.es/m/CAFiTN-sJ0vVpJrZ=R5M+g7Tr8=NN4wKOtrqOcDEsfFfnZgivVA@mail.gmail.com
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Remove a small difference between MinGW and MSVC builds which isn't
needed for modern MinGW, noticed in passing.
Discussion: https://postgr.es/m/CA+hUKGKErNfhmvb_H0UprEmp4LPzGN06yR2_0tYikjzB-2ECMw@mail.gmail.com
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<netinet/tcp.h> is in SUSv3 and all targeted Unix systems have it.
For Windows, we can provide a stub include file, to avoid some #ifdef
noise.
Discussion: https://postgr.es/m/CA+hUKGKErNfhmvb_H0UprEmp4LPzGN06yR2_0tYikjzB-2ECMw@mail.gmail.com
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On BSD-family systems, header <sys/sockio.h> defines socket ioctl
numbers like SIOCGIFCONF. Only AIX is using those now, but it defines
them in <net/if.h> anyway.
Supposing some PostgreSQL hacker wants to test that AIX-only code path
on a more common development system by pretending not to have
getifaddrs(). It's enough to include <sys/ioctl.h>, at least on macOS,
FreeBSD and Linux, and we're already doing that.
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<net/if.h> is in SUSv3 and all targeted Unixes have it. It's used in a
region that is already ifdef'd out for Windows. We're not using it for
any standard definitions, but it's where AIX defines conventional socket
ioctl numbers.
Discussion: https://postgr.es/m/CA+hUKGKErNfhmvb_H0UprEmp4LPzGN06yR2_0tYikjzB-2ECMw@mail.gmail.com
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We carried a special implementation of pg_foreach_ifaddr() using
Solaris's ioctl(SIOCGLIFCONF), but Solaris 11 and illumos adopted
getifaddrs() more than a decade ago, and we prefer to use that. Solaris
10 is EOL'd. Remove the dead code.
Adjust comment about which OSes have getifaddrs(), which also
incorrectly listed AIX. AIX is in fact the only Unix in the build farm
that *doesn't* have it today, so the implementation based on
ioctl(SIOCGIFCONF) (note, no 'L') is still live. All the others have
had it for at least one but mostly two decades.
The last-stop fallback at the bottom of the file is dead code in
practice, but it's hard to justify removing it because the better
options are all non-standard.
Discussion: https://postgr.es/m/CA+hUKGKErNfhmvb_H0UprEmp4LPzGN06yR2_0tYikjzB-2ECMw@mail.gmail.com
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The table column that stores this is of type oid, but is actually limited
to uint16 and has a different path for creating new values. Some of
the documentation already referred to it as an ID, so let's standardize
on that.
While at it, most format strings already use %u, so for consintency
change the remaining stragglers using %d.
Per suggestions from Tom Lane and Justin Pryzby
Discussion: https://www.postgresql.org/message-id/3437166.1659620465%40sss.pgh.pa.us
Backpatch to v15
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1349d2790 changed things to make the planner request that the
query_pathkeys contain pathkeys for any ORDER BY / DISTINCT aggregates.
Some code added prior to that commit in db0d67db2 made it so the order
that the pathkeys appear in the group_pathkeys could be changed so that
the GROUP BY could be executed in a more optimal order which minimized
sort comparisons. 1349d2790 had to make sure that the pathkeys for any
ORDER BY / DISTINCT aggregates remained at the end of the groupby_pathkeys
and wasn't reordered, so some code was added to
add_paths_to_grouping_rel() to first strip off any pathkeys belonging to
ORDER BY / DISTINCT aggregates before passing to the function to optimize
the order of the group_pathkeys.
It seems I dropped the ball in 1349d2790 and mistakenly used the untouched
PlannerInfo.group_pathkeys to pass to get_useful_group_keys_orderings()
instead of the version that had the aggregate pathkeys removed. It was
only the code path that was handling creating paths for
partially_grouped_rel which made this mistake. In practice, we'll never
have any extra pathkeys to strip off when processing
partially_grouped_rel as that's only used when considering partial
paths, which we never do when there are ORDER BY / DISTINCT aggregates.
So this is just a hypothetical bug, not a live bug. We already have the
correct pathkeys determined, so it's of no extra cost to pass the
correct variable.
Reported-by: Justin Pryzby
Discussion: https://postgr.es/m/20220817015755.GB26426@telsasoft.com
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Make build_joinrel_tlist() responsible for adding PHVs that were
already computed in one or the other input relation, and therefore
change add_placeholders_to_joinrel() to only add PHVs that will be
newly computed in this joinrel's output. This makes the handling
of PHVs in build_joinrel_tlist() more like its handling of plain
Vars, which seems like a good thing on intelligibility grounds
and will simplify planned future changes. There is a purely
cosmetic side-effect that the order of entries in the joinrel's
tlist may change; but since it becomes more like the order of
entries in the input tlists, that's not bad.
The reason it wasn't done like this originally was the potential
cost of looking up PlaceHolderInfo entries to consult ph_needed.
Now that that's O(1) it shouldn't hurt.
Discussion: https://postgr.es/m/1405792.1660677844@sss.pgh.pa.us
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Up to now, callers of find_placeholder_info() were required to pass
a flag indicating if it's OK to make a new PlaceHolderInfo. That'd
be fine if the callers had free choice, but they do not. Once we
begin deconstruct_jointree() it's no longer OK to make more PHIs;
while callers before that always want to create a PHI if it's not
there already. So there's no freedom of action, only the opportunity
to cause bugs by creating PHIs too late. Let's get rid of that in
favor of adding a state flag PlannerInfo.placeholdersFrozen, which
we can set at the point where it's no longer OK to make more PHIs.
This patch also simplifies a couple of call sites that were using
complicated logic to avoid calling find_placeholder_info() as much
as possible. Now that that lookup is O(1) thanks to the previous
commit, the extra bitmap manipulations are probably a net negative.
Discussion: https://postgr.es/m/1405792.1660677844@sss.pgh.pa.us
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Up to now we've just searched the placeholder_list when we want to
find the PlaceHolderInfo with a given ID. While there's no evidence
of that being a problem in the field, an upcoming patch will add
find_placeholder_info() calls in build_joinrel_tlist(), which seems
likely to make it more of an issue: a joinrel emitting lots of
PlaceHolderVars would incur O(N^2) cost, and we might be building
a lot of joinrels in complex queries. Hence, add an array that
can be indexed directly by phid to make the lookups constant-time.
Discussion: https://postgr.es/m/1405792.1660677844@sss.pgh.pa.us
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The standard way to check for list emptiness is to compare the
List pointer to NIL; our list code goes out of its way to ensure
that that is the only representation of an empty list. (An
acceptable alternative is a plain boolean test for non-null
pointer, but explicit mention of NIL is usually preferable.)
Various places didn't get that memo and expressed the condition
with list_length(), which might not be so bad except that there
were such a variety of ways to check it exactly: equal to zero,
less than or equal to zero, less than one, yadda yadda. In the
name of code readability, let's standardize all those spellings
as "list == NIL" or "list != NIL". (There's probably some
microscopic efficiency gain too, though few of these look to be
at all performance-critical.)
A very small number of cases were left as-is because they seemed
more consistent with other adjacent list_length tests that way.
Peter Smith, with bikeshedding from a number of us
Discussion: https://postgr.es/m/CAHut+PtQYe+ENX5KrONMfugf0q6NHg4hR5dAhqEXEc2eefFeig@mail.gmail.com
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This reduces the code paths where XLogCtl->InstallXLogFileSegmentActive
is directly touched, and this wrapper function does the same thing as
the original code replaced by the function call.
Author: Bharath Rupireddy
Reviewed-by: Nathan Bossart
Discussion: https://postgr.es/m/CALj2ACVhkf-bC5CX-=6iBUfkO5GqmBntQH+m=HpY0iQ=-g1pRg@mail.gmail.com
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The assert, introduced by 9f1cf97bb5, is intended to check if the prefix
is terminated by a \0 byte, but it has two flaws. Firstly, prefix_size
includes the \0 byte, so prefix[prefix_size] points to the byte after
the null byte. Secondly, the check ensures the byte is not equal \0,
while it should be checking the opposite.
Backpatch-through: 14
Discussion: https://postgr.es/m/b99b6101-2f14-3796-3dfa-4a6cd7d4326d@enterprisedb.com
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The current publisher code checks if UPDATE or DELETE can be executed with
the replica identity of the table even if it's a partitioned table. We can
skip checking the replica identity for partitioned tables because the
operations are actually performed on the leaf partitions (not the
partitioned table).
Reported-by: Brad Nicholson
Author: Hou Zhijie
Reviewed-by: Peter Smith, Amit Kapila
Backpatch-through: 13
Discussion: https://postgr.es/m/CAMMnM%3D8i5DohH%3DYKzV0_wYuYSYvuOJoL9F5nzXTc%2ByzsG1f6rg%40mail.gmail.com
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Since WRITE_NODE_FIELD() output always starts with a space, we don't
need to go out of our way to print another space right before it.
This change is only for visual appearance; the tokenizer on the
reading side would read it the same way (but there is no read support
for A_Expr at this time anyway).
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This option switch supports a total of 8 values, as told by
set_plan_disabling_options() and the documentation, but this was not
reflected in the output generated by --help.
Author: Junwang Zhao
Discussion: https://postgr.es/m/CAEG8a3+pT3cWzyjzKs184L1XMNm8NDnoJLiSjAYSO7XqpRh_vA@mail.gmail.com
Backpatch-through: 10
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