When specified directly as DML queries, INSERT was not getting always
completed to "INSERT INTO", same for DELETE with "DELETE FROM".  This
makes the completion behavior more consistent for both commands, saving
a few keystrokes.

Commands on policies, triggers, grant/revoke, etc. require only DELETE
as completion keyword.

Author: Haiying Tang
Reviewed-by: Dilip Kumar, Julien Rouhaud
Discussion: https://postgr.es/m/OS0PR01MB61135AE2B07CCD1AB8C6A0F6FB549@OS0PR01MB6113.jpnprd01.prod.outlook.com

The worker.c global wrconn is only meant to be used by logical apply/
tablesync workers, but there are other variables with the same name. To
reduce future confusion rename the global from "wrconn" to
"LogRepWorkerWalRcvConn".

While this is just cosmetic, it seems better to backpatch it all the way
back to 10 where this code appeared, to avoid future backpatching
issues.

Author: Peter Smith <smithpb2250@gmail.com>
Discussion: https://postgr.es/m/CAHut+Pu7Jv9L2BOEx_Z0UtJxfDevQSAUW2mJqWU+CtmDrEZVAg@mail.gmail.com

Previously, any error reported by the backend while reading
system_constraints.sql would report the entire file, not just the
particular command it was working on.  (Ask me how I know.)  Likewise,
there were chunks of system_functions.sql that would be read as one
command, which would be annoying if anything failed there.

The issue for system_constraints.sql is an oversight in commit
dfb75e47.  I didn't try to trace down where the poor formatting
in system_functions.sql started, but it's certainly contrary to
the advice at the head of that file.

Commit ab596105 neglected to make the docs match the code.

Run renumber_oids.pl to move high-numbered OIDs down, as per pre-beta
tasks specified by RELEASE_CHANGES.  For reference, the command was
./renumber_oids.pl --first-mapped-oid 8000 --target-oid 6150

Also "make reformat-dat-files".

The only change worthy of note is that pgindent messed up the formatting
of launcher.c's struct LogicalRepWorkerId, which led me to notice that
that struct wasn't used at all anymore, so I just took it out.

The section of the code in charge of returning all the relations
associated to a subscription only need one ScanKey, but allocated two of
them.  This code was introduced as a copy-paste from a different area on
the same file by 7c4f5240, making the result confusing to follow.

Author: Peter Smith
Reviewed-by: Tom Lane, Julien Rouhaud, Bharath Rupireddy
Discussion: https://postgr.es/m/CAHut+PsLKe+rN3FjchoJsd76rx2aMsFTB7CTFxRgUP05p=kcpQ@mail.gmail.com

EXPLAIN ANALYZE for an async-capable ForeignScan node associated with
postgres_fdw is done just by using instrumentation for ExecProcNode()
called from the node's callbacks, causing the following problems:

1) If the remote table to scan is empty, the node is incorrectly
   considered as "never executed" by the command even if the node is
   executed, as ExecProcNode() isn't called from the node's callbacks at
   all in that case.
2) The command fails to collect timings for things other than
   ExecProcNode() done in the node, such as creating a cursor for the
   node's remote query.

To fix these problems, add instrumentation for async-capable nodes, and
modify postgres_fdw accordingly.

My oversight in commit 27e1f145.

While at it, update a comment for the AsyncRequest struct in execnodes.h
and the documentation for the ForeignAsyncRequest API in fdwhandler.sgml
to match the code in ExecAsyncAppendResponse() in nodeAppend.c, and fix
typos in comments in nodeAppend.c.

Per report from Andrey Lepikhov, though I didn't use his patch.

Reviewed-by: Andrey Lepikhov
Discussion: https://postgr.es/m/2eb662bb-105d-fc20-7412-2f027cc3ca72%40postgrespro.ru

Several queries in the privileges regression test cause the planner
to apply the plpgsql function "leak()" to every element of the
histogram for atest12.b.  Since commit 0c882e52 increased the size
of that histogram to 10000 entries, the test invokes that function
over 100000 times, which takes an absolutely unreasonable amount of
time in clobber-cache-always mode.

However, there's no real reason why that has to be a plpgsql
function: for the purposes of this test, all that matters is that
it not be marked leakproof.  So we can replace the plpgsql
implementation with a direct call of int4lt, which has the same
behavior and is orders of magnitude faster.  This is expected to
cut several hours off the buildfarm cycle time for CCA animals.
It has some positive impact in normal builds too, though that's
probably lost in the noise.

Back-patch to v13 where 0c882e52 came in.

Discussion: https://postgr.es/m/575884.1620626638@sss.pgh.pa.us

Previously long was used as the data type for some counters in BufferUsage
and WalUsage. But long is only four byte, e.g., on Windows, and it's entirely
possible to wrap a four byte counter. For example, emitting more than
four billion WAL records in one transaction isn't actually particularly rare.

To avoid the overflows of those counters, this commit changes the data type
of them from long to int64.

Suggested-by: Andres Freund
Author: Masahiro Ikeda
Reviewed-by: Fujii Masao
Discussion: https://postgr.es/m/20201221211650.k7b53tcnadrciqjo@alap3.anarazel.de
Discussion: https://postgr.es/m/af0964ac-7080-1984-dc23-513754987716@oss.nttdata.com

Use a static prolog file instead of generating the prolog from the
existing perl script. Also, support generation of the file in a vpath
build.

Discussion: https://postgr.es/m/700620.1620662868@sss.pgh.pa.us

I copied the existing spelling of "--max_connections", but
that's just wrong :-(.  Evidently setting $ENV{MAX_CONNECTIONS}
has never actually worked in this script.  Given the lack of
complaints, it's probably not worth back-patching a fix.

Per buildfarm.

Discussion: https://postgr.es/m/899209.1620759506@sss.pgh.pa.us

Having to maintain two lists of regression test scripts has proven
annoyingly error-prone.  We can achieve the effect of the
serial_schedule by running the parallel_schedule with
"--max_connections=1"; so do that and remove serial_schedule.

This causes cosmetic differences in the progress output, but it
doesn't seem worth restructuring pg_regress to avoid that.

Discussion: https://postgr.es/m/899209.1620759506@sss.pgh.pa.us

opr_sanity's binary_coercible() function has always been meant
to match the parser's notion of binary coercibility, but it also
has always been a rather poor approximation of the parser's
real rules (as embodied in IsBinaryCoercible()).  That hasn't
bit us so far, but it's predictable that it will eventually.

It also now emerges that implementing this check in plpgsql
performs absolutely horribly in clobber-cache-always testing.
(Perhaps we could do something about that, but I suspect it just
means that plpgsql is exploiting catalog caching to the hilt.)

Hence, let's replace binary_coercible() with a C shim that directly
invokes IsBinaryCoercible(), eliminating both the semantic hazard
and the performance issue.

Most of regress.c's C functions are declared in create_function_1,
but we can't simply move that to before opr_sanity/type_sanity
since those tests would complain about the resulting shell types.
I chose to split it into create_function_0 and create_function_1.
Since create_function_0 now runs as part of a parallel group while
create_function_1 doesn't, reduce the latter to create just those
functions that opr_sanity and type_sanity would whine about.

To make room for create_function_0 in the second parallel group
of tests, move tstypes to the third parallel group.

In passing, clean up some ordering deviations between
parallel_schedule and serial_schedule.

Discussion: https://postgr.es/m/292305.1620503097@sss.pgh.pa.us

The note is no longer true as of 86dc9005, so remove it.

Author: Amit Langote
Discussion: https://postgr.es/m/CA+HiwqFxQn7Hz1wT+wYgnf_9SK0c4BwOOwFFT8jcSZwJrd8HEA@mail.gmail.com

Since its introduction in bbe0a81d, compression of table data supports
LZ4, but nothing had been done within the MSVC scripts to allow users to
build the code with this library.

This commit closes the gap by extending the MSVC scripts to be able to
build optionally with LZ4.  Getting libraries that can be used for
compilation and execution is possible as LZ4 can be compiled down to
MSVC 2010 using its source tarball.  MinGW may require extra efforts to
be able to work, and I have been able to test this only with MSVC, still
this is better than nothing to give users a way to test the feature on
Windows.

Author: Dilip Kumar
Reviewed-by: Michael Paquier
Discussion: https://postgr.es/m/YJPdNeF68XpwDDki@paquier.xyz

It's unusual to have any resjunk columns in an ON CONFLICT ... UPDATE
list, but it can happen when MULTIEXPR_SUBLINK SubPlans are present.
If it happens, the ON CONFLICT UPDATE code path would end up storing
tuples that include the values of the extra resjunk columns.  That's
fairly harmless in the short run, but if new columns are added to
the table then the values would become accessible, possibly leading
to malfunctions if they don't match the datatypes of the new columns.

This had escaped notice through a confluence of missing sanity checks,
including

* There's no cross-check that a tuple presented to heap_insert or
heap_update matches the table rowtype.  While it's difficult to
check that fully at reasonable cost, we can easily add assertions
that there aren't too many columns.

* The output-column-assignment cases in execExprInterp.c lacked
any sanity checks on the output column numbers, which seems like
an oversight considering there are plenty of assertion checks on
input column numbers.  Add assertions there too.

* We failed to apply nodeModifyTable's ExecCheckPlanOutput() to
the ON CONFLICT UPDATE tlist.  That wouldn't have caught this
specific error, since that function is chartered to ignore resjunk
columns; but it sure seems like a bad omission now that we've seen
this bug.

In HEAD, the right way to fix this is to make the processing of
ON CONFLICT UPDATE tlists work the same as regular UPDATE tlists
now do, that is don't add "SET x = x" entries, and use
ExecBuildUpdateProjection to evaluate the tlist and combine it with
old values of the not-set columns.  This adds a little complication
to ExecBuildUpdateProjection, but allows removal of a comparable
amount of now-dead code from the planner.

In the back branches, the most expedient solution seems to be to
(a) use an output slot for the ON CONFLICT UPDATE projection that
actually matches the target table, and then (b) invent a variant of
ExecBuildProjectionInfo that can be told to not store values resulting
from resjunk columns, so it doesn't try to store into nonexistent
columns of the output slot.  (We can't simply ignore the resjunk columns
altogether; they have to be evaluated for MULTIEXPR_SUBLINK to work.)
This works back to v10.  In 9.6, projections work much differently and
we can't cheaply give them such an option.  The 9.6 version of this
patch works by inserting a JunkFilter when it's necessary to get rid
of resjunk columns.

In addition, v11 and up have the reverse problem when trying to
perform ON CONFLICT UPDATE on a partitioned table.  Through a
further oversight, adjust_partition_tlist() discarded resjunk columns
when re-ordering the ON CONFLICT UPDATE tlist to match a partition.
This accidentally prevented the storing-bogus-tuples problem, but
at the cost that MULTIEXPR_SUBLINK cases didn't work, typically
crashing if more than one row has to be updated.  Fix by preserving
resjunk columns in that routine.  (I failed to resist the temptation
to add more assertions there too, and to do some minor code
beautification.)

Per report from Andres Freund.  Back-patch to all supported branches.

Security: CVE-2021-32028

While we were (mostly) careful about ensuring that the dimensions of
arrays aren't large enough to cause integer overflow, the lower bound
values were generally not checked.  This allows situations where
lower_bound + dimension overflows an integer.  It seems that that's
harmless so far as array reading is concerned, except that array
elements with subscripts notionally exceeding INT_MAX are inaccessible.
However, it confuses various array-assignment logic, resulting in a
potential for memory stomps.

Fix by adding checks that array lower bounds aren't large enough to
cause lower_bound + dimension to overflow.  (Note: this results in
disallowing cases where the last subscript position would be exactly
INT_MAX.  In principle we could probably allow that, but there's a lot
of code that computes lower_bound + dimension and would need adjustment.
It seems doubtful that it's worth the trouble/risk to allow it.)

Somewhat independently of that, array_set_element() was careless
about possible overflow when checking the subscript of a fixed-length
array, creating a different route to memory stomps.  Fix that too.

Security: CVE-2021-32027

Source-Git-URL: git://git.postgresql.org/git/pgtranslation/messages.git
Source-Git-Hash: 1c361d3ac016b61715d99f2055dee050397e3f13

When building without --enable-dtrace, emit dummy

    do {} while (0)

statements for the stubbed-out TRACE_POSTGRESQL_foo() macros
instead of empty macros that totally elide the original probe
statement.

This fixes the

    warning: suggest braces around empty body in an ‘if’ statement [-Wempty-body]

introduced by b94409a0.

Author: Craig Ringer <craig.ringer@2ndquadrant.com>
Discussion: https://www.postgresql.org/message-id/flat/20210504221531.cfvpmmdfsou6eitb%40alap3.anarazel.de

Was present in original commit
198b3716 but apparently never used.

Author: Kyotaro Horiguchi, Justin Pryzby
Discussion: https://postgr.es/m/20210428.173633.1525059946206239295.horikyota.ntt@gmail.com

"make dist", in charge of creating a distribution tarball, failed when
attempting to generate ./INSTALL as a new reference added to
guc-default-toast-compression on the documentation for the installation
details was not getting translated properly to plain text.  Like all the
other link references on this page, this adds a new entry to
standalone-profile.xsl to allow the generation of ./INSTALL to finish
properly.

Oversight in 02a93e7e, per buildfarm member guaibasaurus.

This set of commits has some bugs with known fixes, but at this late
stage in the release cycle it seems best to revert and resubmit next
time, along with some new automated test coverage for this whole area.

Commits reverted:

dc88460c: Doc: Review for "Optionally prefetch referenced data in recovery."
1d257577: Optionally prefetch referenced data in recovery.
f003d9f8: Add circular WAL decoding buffer.
323cbe7c: Remove read_page callback from XLogReader.

Remove the new GUC group WAL_RECOVERY recently added by a55a9847, as the
corresponding section of config.sgml is now reverted.

Discussion: https://postgr.es/m/CAOuzzgrn7iKnFRsB4MHp3UisEQAGgZMbk_ViTN4HV4-Ksq8zCg%40mail.gmail.com

Some relations with LZ4 used as the toast compression methods have been
left around in the main regression test suite to stress pg_upgrade, but
pg_dump, that includes tests much more picky in terms of output
generated, had no actual coverage with this feature.

Similarly to collations, tests only working with LZ4 are tracked with an
additional flag, and this uses TestLib::check_pg_config() to check if
the build supports LZ4 or not.  This stresses more scenarios with
tables, materialized views and pg_dump --no-toast-compression.

Author: Dilip Kumar
Reviewed-by: Michael Paquier
Discussion: https://postgr.es/m/CAFiTN-twgPmohG7qj1HXhySq16h123y5OowsQR+5h1YeZE9fmQ@mail.gmail.com

The upstream project is officially named "LZ4", and the documentation
was confused with the option value that can be used with DDLs supporting
this option, and the project name.

Documentation related to the configure option --with-lz4 was missing, so
add something for that.

Author: Dilip Kumar, Michael Paquier
Reviewed-by: Justin Pryzby
Discussion: https://postgr.es/m/YJaOZQDXBVySq+Cc@paquier.xyz

These comments left the impression that USE_VALGRIND isn't really
essential for valgrind testing.  But that's wrong, as I learned
the hard way today.

Discussion: https://postgr.es/m/512778.1620588546@sss.pgh.pa.us

In 9eacee2e, I included some code to verify the cache's memory tracking
is correct by counting up the number of entries and the memory they use
each time we evict something from the cache.  Those values are then
compared to the expected values using Assert.  The problem is that this
requires looping over the entire cache hash table each time we evict an
entry from the cache.  That can be pretty expensive, as noted by Pavel
Stehule.

Here we move this memory accounting checking code so that we only verify
it on cassert builds once when shutting down the Result Cache node.

Aside from the performance increase, this has two distinct advantages:

1) We do the memory checks at the last possible moment before destroying
   the cache.  This means we'll now catch accounting problems that might
   sneak in after a cache eviction.

2) We now do the memory Assert checks when there were no cache evictions.
   This increases the coverage.

One small disadvantage is that we'll now miss any memory tracking issues
that somehow managed to resolve themselves by the end of execution.
However, it seems to me that such a memory tracking problem would be quite
unlikely, and likely somewhat less harmful if one were to exist.

In passing, adjust the loop over the hash table to use the standard
simplehash.h method of iteration.

Reported-by: Pavel Stehule
Discussion: https://postgr.es/m/CAFj8pRAzgoSkdEiqrKbT=7yG9FA5fjUAP3jmJywuDqYq6Ki5ug@mail.gmail.com

It seems that various people have moved GUCs around in the config.sgml
listing without bothering to make the code agree.  Ensure that the
config_group codes assigned to GUCs match where they are listed in
config.sgml.  Likewise ensure that postgresql.conf.sample lists GUCs
in the same sub-section and same ordering as they appear in config.sgml.

(I've got some doubts about some of these choices, but for the purposes
of this patch, we'll treat config.sgml as gospel.)

Notably, this requires adding a WAL_RECOVERY config_group value,
because 1d257577 didn't.  As long as we're renumbering that enum
anyway, let's take out the values corresponding to major groups
that are divided into sub-groups.  No GUC should be assigned to the
major group itself, so those values just create a temptation to
do the wrong thing, while adding work for translators.

In passing, adjust the short_desc strings for PRESET_OPTIONS GUCs
to uniformly use the phrasing "Shows XYZ.", removing the impression
some of these strings left that you can set the value.

While some of these errors are old, no back-patch, as changing the
contents of the pg_settings view in stable branches seems more likely
to be seen as a compatibility break than anything helpful.

Bharath Rupireddy, Justin Pryzby, Tom Lane

Discussion: https://postgr.es/m/16997-ff16127f6e0d1390@postgresql.org
Discussion: https://postgr.es/m/20210413123139.GE6091@telsasoft.com

I came to fix "useful only useful", but the more I looked at the text
the more things I thought could be improved.

Specifying an incorrect value for the compression method of an attribute
caused ERRCODE_FEATURE_NOT_SUPPORTED to be raised as error.  Use instead
ERRCODE_INVALID_PARAMETER_VALUE to be more consistent.

Author: Dilip Kumar
Discussion: https://postgr.es/m/CAFiTN-vH84fE-8C4zGZw4v0Wyh4Y2v=5JWg2fGE5+LPaDvz1GQ@mail.gmail.com

When executing the INSERT with batching, we may need to rebuild the
query when the batch size changes, in which case we pfree the current
string. We must not release the original string, stored in fdw_private,
because that may be needed in EXPLAIN ANALYZE. So make copy of the SQL,
but only for INSERT queries.

Reported-by: Pavel Stehule
Discussion: https://postgr.es/m/CAFj8pRCL_Rjw-MCR6J7VX9OF7MR6PA5K8qUbrMvprW_e-aHkfQ%40mail.gmail.com

Discussion: https://postgr.es/m/20210506035602.3akutfvvojngj3nb@alap3.anarazel.de

This patch replaces use of the global "wrconn" variable in
AlterSubscription_refresh with a local variable of the same name, making
it consistent with other functions in subscriptioncmds.c (e.g.
DropSubscription).

The global wrconn is only meant to be used for logical apply/tablesync worker.
Abusing it this way is known to cause trouble if an apply worker
manages to do a subscription refresh, such as reported by Jeremy Finzel
and diagnosed by Andres Freund back in November 2020, at
https://www.postgresql.org/message-id/20201111215820.qihhrz7fayu6myfi@alap3.anarazel.de

Backpatch to 10.  In branch master, also move the connection establishment
to occur outside the PG_TRY block; this way we can remove a test for NULL in
PG_FINALLY, and it also makes the code more consistent with similar code in
the same file.

Author: Peter Smith <peter.b.smith@fujitsu.com>
Reviewed-by: Bharath Rupireddy <bharath.rupireddyforpostgres@gmail.com>
Reviewed-by: Japin Li <japinli@hotmail.com>
Discussion: https://postgr.es/m/CAHut+Pu7Jv9L2BOEx_Z0UtJxfDevQSAUW2mJqWU+CtmDrEZVAg@mail.gmail.com