The implementation of FSM for indexes is simpler than heap, where 0 is
used to track if a page is in-use and (BLCKSZ - 1) if a page is free.
One comment in indexfsm.c and one description in the documentation of
pg_freespacemap were incorrect about that.
Author: Alex Friedman <alexf01@gmail.com>
Discussion: https://postgr.es/m/71eef655-c192-453f-ac45-2772fec2cb04@gmail.com
Backpatch-through: 13
Performing AIO using io_uring can be considerably faster than
io_method=worker, particularly when lots of small IOs are issued, as
a) the context-switch overhead for worker based AIO becomes more significant
b) the number of IO workers can become limiting
io_uring, however, is linux specific and requires an additional compile-time
dependency (liburing).
This implementation is fairly simple and there are substantial optimization
opportunities.
The description of the existing AIO_IO_COMPLETION wait event is updated to
make the difference between it and the new AIO_IO_URING_EXECUTION clearer.
Reviewed-by: Noah Misch <noah@leadboat.com>
Reviewed-by: Jakub Wartak <jakub.wartak@enterprisedb.com>
Discussion: https://postgr.es/m/uvrtrknj4kdytuboidbhwclo4gxhswwcpgadptsjvjqcluzmah%40brqs62irg4dt
Discussion: https://postgr.es/m/20210223100344.llw5an2aklengrmn@alap3.anarazel.de
Discussion: https://postgr.es/m/stj36ea6yyhoxtqkhpieia2z4krnam7qyetc57rfezgk4zgapf@gcnactj4z56m
Ephemeral inconsistencies across multiple attributes of pg_stat_activity
can exist as the system is designed to be efficient with a low overhead.
This question is raised by users from time to time based on the data
read in the view, so let's add a note in the docs about this
possibility.
Author: Alex Friedman <alexf01@gmail.com>
Reviewed-by: Sami Imseih <samimseih@gmail.com>
Discussion: https://postgr.es/m/8a275154-a654-44b0-ab37-197802f04c7b@gmail.com
The old naming pattern (mirroring liburing's naming) was inconsistent with
the (not yet introduced) callers. It seems better to get rid of the
inconsistency now than to grow more users of the odd naming.
Reported-by: Noah Misch <noah@leadboat.com>
Discussion: https://postgr.es/m/20250326001915.bc.nmisch@google.com
Otherwise the results of e.g. temp table buffer verification errors will not
reach bufmgr.c. Obviously that's not right. Found while expanding the tests
for invalid buffer contents.
Reviewed-by: Noah Misch <noah@leadboat.com>
Discussion: https://postgr.es/m/20250326001915.bc.nmisch@google.com
As reported by Noah, it's possible, although practically very unlikely, that
interrupts could be processed in between pgaio_io_reopen() and
pgaio_io_perform_synchronously(). Prevent that by explicitly holding
interrupts.
It also seems good to add an assertion to pgaio_io_before_prep() to ensure
that interrupts are held, as otherwise FDs referenced by the IO could be
closed during interrupt processing. All code in the aio series currently runs
the code with interrupts held, but it seems better to be paranoid.
Reviewed-by: Noah Misch <noah@leadboat.com>
Reported-by: Noah Misch <noah@leadboat.com>
Discussion: https://postgr.es/m/20250324002939.5c.nmisch@google.com
It added bogus whitespace at the end of a line in the documentation.
It should not have done that.
The pg_overexplain tests must SET debug_parallel_query = false,
not just RESET debug_parallel_query, or we get failures on test
machines that make debug_parallel_query = true the defualt.
There's a fair amount of information in the Plan and PlanState trees
that isn't printed by any existing EXPLAIN option. This means that,
when working on the planner, it's often necessary to rely on facilities
such as debug_print_plan, which produce excessively voluminous
output. Hence, use the new EXPLAIN extension facilities to implement
EXPLAIN (DEBUG) and EXPLAIN (RANGE_TABLE) as extensions to the core
EXPLAIN facility.
A great deal more could be done here, and the specific choices about
what to print and how are definitely arguable, but this is at least
a starting point for discussion and a jumping-off point for possible
future improvements.
Reviewed-by: Sami Imseih <samimseih@gmail.com>
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Reviweed-by: Andrei Lepikhov <lepihov@gmail.com> (who didn't like it)
Discussion: http://postgr.es/m/CA+TgmoZfvQUBWQ2P8iO30jywhfEAKyNzMZSR+uc2xr9PZBw6eQ@mail.gmail.com
The brin_bloom_union() function combines two BRIN summaries, by merging
one filter into the other. With bloom, we have to decompress the filters
first, but the function failed to update the summary to store the merged
filter. As a consequence, the index may be missing some of the data, and
return false negatives.
This issue exists since BRIN bloom indexes were introduced in Postgres
14, but at that point the union function was called only when two
sessions happened to summarize a range concurrently, which is rare. It
got much easier to hit in 17, as parallel builds use the union function
to merge summaries built by workers.
Fixed by storing a pointer to the decompressed filter, and freeing the
original one. Free the second filter too, if it was decompressed. The
freeing is not strictly necessary, because the union is called in
short-lived contexts, but it's tidy.
Backpatch to 14, where BRIN bloom indexes were introduced.
Reported by Arseniy Mukhin, investigation and fix by me.
Reported-by: Arseniy Mukhin
Discussion: https://postgr.es/m/18855-1cf1c8bcc22150e6%40postgresql.org
Backpatch-through: 14
It seems potentially useful to label our shared libraries with version
information, now that a facility exists for retrieving that. This
patch labels them with the PG_VERSION string. There was some
discussion about using semantic versioning conventions, but that
doesn't seem terribly helpful for modules with no SQL-level presence;
and for those that do have SQL objects, we typically expect them
to support multiple revisions of the SQL definitions, so it'd still
not be very helpful.
I did not label any of src/test/modules/. It seems unnecessary since
we don't install those, and besides there ought to be someplace that
still provides test coverage for the original PG_MODULE_MAGIC macro.
Author: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/dd4d1b59-d0fe-49d5-b28f-1e463b68fa32@gmail.com
This macro allows dynamically loaded shared libraries (modules) to
provide a wired-in module name and version, and possibly other
compile-time-constant fields in future. This information can be
retrieved with the new pg_get_loaded_modules() function.
This feature is expected to be particularly useful for modules
that do not have any exposed SQL functionality and thus are
not associated with a SQL-level extension object. But even for
modules that do belong to extensions, being able to verify the
actual code version can be useful.
Author: Andrei Lepikhov <lepihov@gmail.com>
Reviewed-by: Yurii Rashkovskii <yrashk@omnigres.com>
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/dd4d1b59-d0fe-49d5-b28f-1e463b68fa32@gmail.com
Due to a conflict in macro names on Windows between <wincrypt.h>
and <openssl/ssl.h> these headers need to be included using a
predictable pattern with an undef to handle that. The GSSAPI
header <gssapi.h> does include <wincrypt.h> which cause problems
with compiling PostgreSQL using MSVC when OpenSSL and GSSAPI are
both enabled in the tree. Rather than fixing piecemeal for each
file including gssapi headers, move the the includes and undef
to a new file which should be used to centralize the logic.
This patch is a reworked version of a patch by Imran Zaheer
proposed earlier in the thread. Once this has proven effective
in master we should look at backporting this as the problem
exist at least since v16.
Author: Daniel Gustafsson <daniel@yesql.se>
Co-authored-by: Imran Zaheer <imran.zhir@gmail.com>
Reported-by: Dave Page <dpage@pgadmin.org>
Reviewed-by: Andres Freund <andres@anarazel.de>
Reviewed-by: vignesh C <vignesh21@gmail.com>
Discussion: https://postgr.es/m/20240708173204.3f3xjilglx5wuzx6@awork3.anarazel.de
The test committed in 1a759c8327 was prone to failing when using
locales with a different decimal separator. Since the test value
isn't the important part, change to using an integer instead.
Author: Daniel Gustafsson <daniel@yesql.se>
Reported-by: Pavel Stehule <pavel.stehule@gmail.com>
Reviewed-by: Pavel Stehule <pavel.stehule@gmail.com>
Discussion: https://postgr.es/m/CAFj8pRDE=7uW7QP4rg-OQLE2i-puYsUUt+eHE-L6_b_J9w=eWg@mail.gmail.com
This enables SCRAM authentication for dblink (using dblink_fdw) when
connecting to a foreign server without having to store a plain-text
password on user mapping options
This uses the same approach as it was implemented for postgres_fdw in
commit 761c79508e. (It also contains the equivalent of the
subsequent fixes 76563f88cf and d2028e9bbc1.)
Author: Matheus Alcantara <mths.dev@pm.me>
Reviewed-by: Jacob Champion <jacob.champion@enterprisedb.com>
Discussion: https://www.postgresql.org/message-id/flat/CAFY6G8ercA1KES%3DE_0__R9QCTR805TTyYr1No8qF8ZxmMg8z2Q%40mail.gmail.com
These are useful general-purpose math functions which are included in
POSIX and C99, and are commonly included in other math libraries, so
expose them as SQL-callable functions.
Author: Dean Rasheed <dean.a.rasheed@gmail.com>
Reviewed-by: Stepan Neretin <sncfmgg@gmail.com>
Reviewed-by: Peter Eisentraut <peter@eisentraut.org>
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Reviewed-by: Dmitry Koval <d.koval@postgrespro.ru>
Reviewed-by: Alexandra Wang <alexandra.wang.oss@gmail.com>
Discussion: https://postgr.es/m/CAEZATCXpGyfjXCirFk9au+FvM0y2Ah+2-0WSJx7MO368ysNUPA@mail.gmail.com
Setting the iteration count for SCRAM secret generation to INT_MAX
will cause an infinite loop in scram_SaltedPassword() due to integer
overflow, as the loop uses the "i <= iterations" comparison. To fix,
use "i < iterations" instead.
Back-patch to v16 where the user-settable GUC scram_iterations has
been added.
Author: Kevin K Biju <kevinkbiju@gmail.com>
Reviewed-by: Richard Guo <guofenglinux@gmail.com>
Reviewed-by: Michael Paquier <michael@paquier.xyz>
Discussion: https://postgr.es/m/CAM45KeEMm8hnxdTOxA98qhfZ9CzGDdgy3mxgJmy0c+2WwjA6Zg@mail.gmail.com
custom_query_jumble (introduced in 5ac462e2b7 as a node field
attribute) is now assigned to the expanded reference name "eref" of
RangeTblEntry, adding in the query jumble computation the non-qualified
aliased relation name, without the list of column names. The relation
OID is removed from the query jumbling.
The effects of this change can be seen in the tests added by
3430215fe3, where pg_stat_statements (PGSS) entries are now grouped
using the relation name, ignoring the relation search_path may point at.
For example, these two relations are different, but are now grouped in a
single PGSS entry as they are assigned the same query ID:
CREATE TABLE foo1.tab (a int);
CREATE TABLE foo2.tab (b int);
SET search_path = 'foo1';
SELECT count(*) FROM tab;
SET search_path = 'foo2';
SELECT count(*) FROM tab;
SELECT count(*) FROM foo1.tab;
SELECT count(*) FROM foo2.tab;
SELECT query, calls FROM pg_stat_statements WHERE query ~ 'FROM tab';
query | calls
--------------------------+-------
SELECT count(*) FROM tab | 4
(1 row)
It is still possible to use an alias in the FROM clause to split these.
This behavior is useful for relations re-created with the same name,
where queries based on such relations would be grouped in the same
PGSS entry. For permanent schemas, it should not really matter in
practice. The main benefit is for workloads that use a lot of temporary
relations, which are usually re-created with the same name continuously.
These can be a heavy source of bloat in PGSS depending on the workload.
Such entries can now be grouped together, improving the user experience.
The original idea from Christoph Berg used catalog lookups to find
temporary relations, something that the query jumble has never done, and
it could cause some performance regressions. The idea to use
RangeTblEntry.eref and the relation name, applying the same rules for
all relations, temporary and not temporary, has been proposed by Tom
Lane. The documentation additions have been suggested by Sami Imseih.
Author: Michael Paquier <michael@paquier.xyz>
Co-authored-by: Sami Imseih <samimseih@gmail.com>
Reviewed-by: Christoph Berg <myon@debian.org>
Reviewed-by: Lukas Fittl <lukas@fittl.com>
Reviewed-by: Sami Imseih <samimseih@gmail.com>
Discussion: https://postgr.es/m/Z9iWXKGwkm8RAC93@msg.df7cb.de
The tests introduced by commit 76563f88cf only work when Unix-domain
sockets are available. This is optional on Windows, and buildfarm
member drongo runs without them. To fix, skip the test if Unix-domain
sockets are not enabled.
By adding the positive variants of options, in addition to the
negative variants that already exist, users can be explicit about what
pg_dump should produce.
Discussion: https://postgr.es/m/bd0513e4b1ea2b2f2d06f02720c6579711cb62a6.camel@j-davis.com
Reviewed-by: Corey Huinker <corey.huinker@gmail.com>
Reviewed-by: Andres Freund <andres@anarazel.de>
A node field marked with custom_query_jumble and query_jumble_ignore
would generate some code of a custom routine. The script is changed so
as custom_query_jumble behaves like the other options in this case,
query_jumble_ignore taking priority, with no code generated.
A comment related to the code generated for node types was misplaced.
Thinkos introduced in 5ac462e2b7.
Reported-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/1324036.1742945060@sss.pgh.pa.us
We need the -I switch for libpq_srcdir to come before any -I switches
injected by configure. Otherwise there is a risk of pulling in a
mismatched version of libpq_fe.h from someplace like
/usr/local/include, if the platform has another Postgres version
installed there. This evidently accounts for today's buildfarm
failures on "anaconda".
In principle the -I switch for src/port/ is at similar hazard, and has
been for a very long time. But the only .h files we keep there are
pg_config_paths.h and pthread-win32.h, neither of which get installed
on Unix-ish systems, so the odds of picking up a conflicting header
seem pretty small. That doubtless accounts for the lack of prior
reports.
Back-patch to v17 where pg_regress acquired a build dependency on
libpq_fe.h. We could go back further to fix the hazard for src/port/
in older branches, but it seems unlikely to be worth troubling over.
Reported-by: Nathan Bossart <nathandbossart@gmail.com>
Author: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/Z-MhRzoc7t-nPUQG@nathan
Backpatch-through: 17
These tests provide coverage for RangeTblEntry and how query jumbling
works with search_path, as well as the case where relations are
re-created, generating a different query ID as the relation OID is used
in the computation.
A patch is under discussion to switch to a different approach based on
the relation name, and there was no test coverage for this area,
including how queries are currently grouped with search_path. This is
useful to track how the situation changes between HEAD and any patches
proposed.
Christoph has proposed the test with ON COMMIT DROP temporary tables,
and I have written the second part.
Author: Christoph Berg <myon@debian.org>
Author: Michael Paquier <michael@paquier.xyz>
Discussion: https://postgr.es/m/Z9iWXKGwkm8RAC93@msg.df7cb.de
This new option instructs pg_upgrade to move the data directories
from the old cluster to the new cluster and then to replace the
catalog files with those generated for the new cluster. This mode
can outperform --link, --clone, --copy, and --copy-file-range,
especially on clusters with many relations.
However, this mode creates many garbage files in the old cluster,
which can prolong the file synchronization step if
--sync-method=syncfs is used. To handle that, we recommend using
--sync-method=fsync with this mode, and pg_upgrade internally uses
"initdb --sync-only --no-sync-data-files" for file synchronization.
pg_upgrade will synchronize the catalog files as they are
transferred. We assume that the database files transferred from
the old cluster were synchronized prior to upgrade.
This mode also complicates reverting to the old cluster, so we
recommend restoring from backup upon failure during or after file
transfer. We did consider teaching pg_upgrade how to generate a
revert script for such failures, but we decided against it due to
the rarity of failing during file transfer, the complexity of
generating the script, and the potential for misusing the script.
The new mode is limited to clusters located in the same file
system. With some effort, we could probably support upgrades
between different file systems, but this mode is unlikely to offer
much benefit if we have to copy the files across file system
boundaries.
It is also limited to upgrades from version 10 or newer. There are
a few known obstacles for using swap mode to upgrade from older
versions. For example, the visibility map format changed in v9.6,
and the sequence tuple format changed in v10. In fact, swap mode
omits the --sequence-data option in its uses of pg_dump and instead
reuses the old cluster's sequence data files. While teaching swap
mode to deal with these kinds of changes is surely possible (and we
may have to deal with similar problems in the future, anyway), it
doesn't seem worth the effort to support upgrades from
long-unsupported versions.
Reviewed-by: Greg Sabino Mullane <htamfids@gmail.com>
Reviewed-by: Robert Haas <robertmhaas@gmail.com>
Discussion: https://postgr.es/m/Zyvop-LxLXBLrZil%40nathan
This new option instructs pg_dump to dump sequence data when the
--no-data, --schema-only, or --statistics-only option is specified.
This was originally considered for commit a7e5457db8, but it was
left out at that time because there was no known use-case. A
follow-up commit will use this to optimize pg_upgrade's file
transfer step.
Reviewed-by: Robert Haas <robertmhaas@gmail.com>
Discussion: https://postgr.es/m/Zyvop-LxLXBLrZil%40nathan
This new option instructs initdb to skip synchronizing any files
in database directories, the database directories themselves, and
the tablespace directories, i.e., everything in the base/
subdirectory and any other tablespace directories. Other files,
such as those in pg_wal/ and pg_xact/, will still be synchronized
unless --no-sync is also specified. --no-sync-data-files is
primarily intended for internal use by tools that separately ensure
the skipped files are synchronized to disk. A follow-up commit
will use this to help optimize pg_upgrade's file transfer step.
The --sync-method=fsync implementation of this option makes use of
a new exclude_dir parameter for walkdir(). When not NULL,
exclude_dir specifies a directory to skip processing. The
--sync-method=syncfs implementation of this option just skips
synchronizing the non-default tablespace directories. This means
that initdb will still synchronize some or all of the database
files, but there's not much we can do about that.
Discussion: https://postgr.es/m/Zyvop-LxLXBLrZil%40nathan
For import and export, use schemaname/relname rather than
regclass.
This is more natural during export, fits with the other arguments
better, and it gives better control over error handling in case we
need to downgrade more errors to warnings.
Also, use text for the argument types for schemaname, relname, and
attname so that casts to "name" are not required.
Author: Corey Huinker <corey.huinker@gmail.com>
Discussion: https://postgr.es/m/CADkLM=ceOSsx_=oe73QQ-BxUFR2Cwqum7-UP_fPe22DBY0NerA@mail.gmail.com
The default interval for \watch to wait between executing queries,
when executed without a specified interval, was hardcoded to two
seconds. This adds the new variable WATCH_INTERVAL which is used
to set the default interval, making it configurable for the user.
This makes \watch the first command which has a user configurable
default setting.
Author: Daniel Gustafsson <daniel@yesql.se>
Reviewed-by: Heikki Linnakangas <hlinnaka@iki.fi>
Reviewed-by: Michael Paquier <michael@paquier.xyz>
Reviewed-by: Kirill Reshke <reshkekirill@gmail.com>
Reviewed-by: Masahiro Ikeda <ikedamsh@oss.nttdata.com>
Reviewed-by: Laurenz Albe <laurenz.albe@cybertec.at>
Reviewed-by: Greg Sabino Mullane <htamfids@gmail.com>
Reviewed-by: Ashutosh Bapat <ashutosh.bapat.oss@gmail.com>
Discussion: https://postgr.es/m/B2FD26B4-8F64-4552-A603-5CC3DF1C7103@yesql.se
Currently, createForeignKeyCheckTriggers() takes a Relation type as
its first argument, but it doesn't use that argument directly.
Instead, it fetches the relation OID by calling RelationGetRelid().
Therefore, it would be more consistent with other functions (e.g.,
createForeignKeyCheckTriggers()) to pass the relation OID directly
instead of the whole Relation.
Author: Amul Sul <amul.sul@enterprisedb.com>
Discussion: https://www.postgresql.org/message-id/flat/CAAJ_b962c5AcYW9KUt_R_ER5qs3fUGbe4az-SP-vuwPS-w-AGA@mail.gmail.com
Split ATExecAlterConstraintInternal() into two functions:
ATExecAlterConstrDeferrability() and
ATExecAlterConstrInheritability(). This simplifies the code and
avoids unnecessary confusion caused by recursive code, which isn't
needed for ATExecAlterConstrInheritability().
(This also takes over the changes in commit 64224a834c, as the new
AlterConstrDeferrabilityRecurse() is essentially the old
ATExecAlterChildConstr().)
Author: Amul Sul <amul.sul@enterprisedb.com>
Discussion: https://www.postgresql.org/message-id/flat/CAAJ_b962c5AcYW9KUt_R_ER5qs3fUGbe4az-SP-vuwPS-w-AGA@mail.gmail.com
Small fixes for commit f4e53e10b6c: Add missing calls to
InvokeObjectPostAlterHook() and also CacheInvalidateRelcache(). The
former change could have a user-visible effect. The latter omission
might have caused other bugs, but it is not clear whether one actually
existed. With these changes, the code is now more consistent with
similar ALTER CONSTRAINT variants, especially the ones that set the
deferrability.
Reviewed-by: Álvaro Herrera <alvherre@alvh.no-ip.org>
Discussion: https://postgr.es/m/CAF1DzPVfOW6Kk=7SSh7LbneQDJWh=PbJrEC_Wkzc24tHOyQWGg@mail.gmail.com
If a var belongs to the innerrel of the joinrel, it's not possible that
it belongs to the outerrel. This commit removes the redundant check from
the if-clause but keeps it as an assertion.
Discussion: https://postgr.es/m/flat/CAHewXN=8aW4hd_W71F7Ua4+_w0=bppuvvTEBFBF6G0NuSXLwUw@mail.gmail.com
Author: Tender Wang <tndrwang@gmail.com>
Reviewed-by: Alexander Pyhalov <a.yhalov@postgrespro.ru>
Backpatch-through: 17
Previously we used pg_int64 in three function prototypes in libpq. It
was added by commit 461ef73f to expose the platform-dependent type used
for int64 in the C89 era. As of commit 962da900 it is defined as
standard int64_t, and the dust seems to have settled.
Let's just use int64_t directly in these three client-facing functions
instead of (yet) another name. We've required C99 and thus <stdint.h>
since PostgreSQL 12, C89 and C++98 compilers are long gone, and client
applications very likely use standard types for their own 64-bit needs.
This also cleans up the obscure placement of a new #include <stdint.h>
directive in postgres_ext.h, required for the new definition. The
typedef was hiding in there for historical reasons, but it doesn't fit
postgres_ext.h's own description of its purpose and there is no evidence
of client applications including postgres_ext.h directly to see it.
Keep a typedef marked deprecated for backward compatibility, but move it
into libpq-fe.h where it was used.
Reviewed-by: Peter Eisentraut <peter@eisentraut.org>
Discussion: https://postgr.es/m/CA%2BhUKGKn_EkNNGMY5RzMcKP%2Ba6urT4JF%3DCPhw_zHtQwjvX6P2g%40mail.gmail.com
The network (inet) support functions currently only supported a
hardcoded btree operator family. With the generalized compare type
facility, we can generalize this to support any operator family from
any index type that supports the required operators.
Author: Mark Dilger <mark.dilger@enterprisedb.com>
Co-authored-by: Peter Eisentraut <peter@eisentraut.org>
Discussion: https://www.postgresql.org/message-id/flat/E72EAA49-354D-4C2E-8EB9-255197F55330@enterprisedb.com
This option gives the possibility for query jumble to define a custom
routine for the field of a Node, extending support for
custom_query_jumble as a node field attribute. When dealing with
complex node structures, this can be simpler than having to enforce a
custom function across a full node.
Custom functions need to be defined in queryjumblefuncs.c, named as
_jumble${node}_${field}(), and use in input the JumbleState, the node
and its field. The field is not really required if we have the Node,
but it makes custom implementations somewhat easier to think about. The
code generated by gen_node_support.pl uses a macro called
JUMBLE_CUSTOM(), hiding the internals of the logic inside
queryjumblefuncs.c.
This will be used by an upcoming patch manipulating adding a custom
routine into a field of RangeTblEntry, but this facility can become
useful in more cases.
Reviewed-by: Christoph Berg <myon@debian.org>
Discussion: https://postgr.es/m/Z9y43-dRvb4EtxQ0@paquier.xyz
Reduces memory required for hash aggregation by avoiding an allocation
and a pointer in the TupleHashEntryData structure. That structure is
used for all buckets, whether occupied or not, so the savings is
substantial.
Discussion: https://postgr.es/m/AApHDvpN4v3t_sdz4dvrv1Fx_ZPw=twSnxuTEytRYP7LFz5K9A@mail.gmail.com
Reviewed-by: David Rowley <dgrowleyml@gmail.com>
Allows an "extra" argument that allocates extra memory at the end of
the MinimalTuple. This is important for callers that need to store
additional data, but do not want to perform an additional allocation.
Suggested-by: David Rowley <dgrowleyml@gmail.com>
Discussion: https://postgr.es/m/CAApHDvppeqw2pNM-+ahBOJwq2QmC0hOAGsmCpC89QVmEoOvsdg@mail.gmail.com
The entries aren't freed until the entire hash table is destroyed, so
use the Bump allocator to improve allocation speed, avoid wasting
space on the chunk header, and avoid wasting space due to the
power-of-two allocations.
Discussion: https://postgr.es/m/CAApHDvqv1aNB4cM36FzRwivXrEvBO_LsG_eQ3nqDXTjECaatOQ@mail.gmail.com
Reviewed-by: David Rowley
Semi-join joins below left/right join are deparsed as
subqueries. Thus, we can't refer to subqueries vars from upper relations.
This commit avoids pulling conditions from them.
Reported-by: Robins Tharakan <tharakan@gmail.com>
Bug: #18852
Discussion: https://postgr.es/m/CAEP4nAzryLd3gwcUpFBAG9MWyDfMRX8ZjuyY2XXjyC_C6k%2B_Zw%40mail.gmail.com
Author: Alexander Pyhalov <a.pyhalov@postgrespro.ru>
Reviewed-by: Alexander Korotkov <aekorotkov@gmail.com>
Backpatch-through: 17
Until now max_files_per_process=N limited each backend to open N files in
total (minus a safety factor), even if there were already more files opened in
postmaster and inherited by backends. Change max_files_per_process to control
how many additional files each process is allowed to open.
The main motivation for this is the patch to add io_method=io_uring, which
needs to open one file for each backend. Without this patch, even if
RLIMIT_NOFILE is high enough, postmaster will fail in set_max_safe_fds() if
started with a high max_connections. The cause of the failure is that, until
now, set_max_safe_fds() subtracted the already open files from
max_files_per_process.
Reviewed-by: Noah Misch <noah@leadboat.com>
Discussion: https://postgr.es/m/w6uiicyou7hzq47mbyejubtcyb2rngkkf45fk4q7inue5kfbeo@bbfad3qyubvs
Discussion: https://postgr.es/m/CAGECzQQh6VSy3KG4pN1d=h9J=D1rStFCMR+t7yh_Kwj-g87aLQ@mail.gmail.com
This field was added in commit 0164a0f9ee to provide a way to
determine whether a storage parameter was explicitly set for the
relation or if it just picked up the default value. In most cases,
this can be accomplished by giving the storage parameter a special
out-of-range default value (e.g., the
autovacuum_vacuum_insert_threshold storage parameter defaults to
-2), but this approach doesn't work in all cases. For example, a
Boolean storage parameter cannot be given an out-of-range default,
so we need another way to discover the source of its value.
Reported-by: "David G. Johnston" <david.g.johnston@gmail.com>
Reviewed-by: "David G. Johnston" <david.g.johnston@gmail.com>
Discussion: https://postgr.es/m/CAKFQuwYKtEUYKS%2B18gRs-xPhn0qOJgM2KGyyWVCODHuVn9F-XQ%40mail.gmail.com
The bitmap heap scan skip fetch optimization skips fetching the heap
block when a page is set all-visible in the visibility map and no
columns from the table are needed to satisfy the query.
2b73a8cd33 and c3953226a0 changed the control flow of bitmap heap scan
to use the read stream API. The read stream API returns buffers
containing blocks to the user. To make this work with the skip fetch
optimization, we keep a count of the empty tuples we need to emit for
all the blocks skipped and only emit the empty tuples after processing
the next block fetched from the heap or at the end of the scan.
It's incorrect to recheck NULL tuples, so we must set `recheck` to false
before yielding control back to BitmapHeapNext(). This was done before
emitting any remaining empty tuples at the end of the scan but not for
empty tuples emitted during the scan. This meant that if a page fetched
from the heap did require recheck and set `recheck` to true and then we
emitted empty tuples for subsequent blocks, we would get wrong results.
Fix this by always setting `recheck` to false before emitting empty
tuples.
Reported-by: Alexander Lakhin <exclusion@gmail.com>
Tested-by: Andres Freund <andres@anarazel.de>
Discussion: https://postgr.es/m/496f7acd-881c-4df3-9bd3-8f8534dfec26%40gmail.com
Michael Paquier