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Oversight in a734fd5d1.
Michael Paquier
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The code was intentionally not very careful about leaking strdup'd
strings in case of an error. That was forgivable probably, but it
also failed to notice strdup() failures, which could lead to subsequent
null-pointer-dereference crashes, since many callers unsurprisingly
didn't check for null pointers in the struct lconv fields. An even
worse problem is that it could throw error while we were setlocale'd
to a non-C locale, causing unwanted behavior in subsequent libc calls.
Rewrite to ensure that we cannot throw elog(ERROR) until after we've
restored the previous locale settings, or at least attempted to.
(I'm sorely tempted to make restore failure be a FATAL error, but
will refrain for the moment.) Having done that, it's not much more
work to ensure that we clean up strdup'd storage on the way out, too.
This code is substantially the same in all supported branches, so
back-patch all the way.
Michael Paquier and Tom Lane
Discussion: <CAB7nPqRMbGqa_mesopcn4MPyTs34eqtVEK7ELYxvvV=oqS00YA@mail.gmail.com>
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Fix thinko in commit da1c91631: even if the original query was free of
parallel hazards, we might introduce such a hazard by adding PARAM_EXEC
Param nodes. Adjust is_parallel_safe() so that it will scan the given
expression whenever any such nodes have been created. Per report from
Andreas Seltenreich.
Discussion: <878tse6yvf.fsf@credativ.de>
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Previously, we only dropped an orphan temp table when it became old
enough to threaten wraparound; instead, doing it immediately. The
only value of waiting is that someone might be able to examine the
contents of the orphan temp table for forensic purposes, but it's
pretty difficult to actually do that and few users will wish to do so.
On the flip side, not performing the drop immediately generates log
spam and bloats pg_class.
In addition, per a report from Grigory Smolkin, if a temporary schema
contains a very large number of temporary tables, a backend attempting
to clear the temporary schema might fail due to lock table exhaustion.
It's helpful for autovacuum to clean up after such cases, and we don't
want it to wait for wraparound to threaten before doing so. To
prevent autovacuum from failing in the same manner as a backend trying
to drop an entire temp schema, remove orphan temp tables in batches of
50, committing after each batch, so that we don't accumulate an
unbounded number of locks. If a drop fails, retry other orphan tables
that need to be dropped up to 10 times before giving up. With this
system, if a backend does fail to clean a temporary schema due to
lock table exhaustion, autovacuum should hopefully put things right
the next time it processes the database.
Discussion: CAB7nPqSbYT6dRwsXVgiKmBdL_ARemfDZMPA+RPeC_ge0GK70hA@mail.gmail.com
Michael Paquier, with a bunch of comment changes by me.
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We mustn't force parallel mode if the query has any subplans, since
ExecSerializePlan doesn't transmit them to workers. Testing
top_plan->initPlan is inadequate because (1) there might be initPlans
attached to lower plan nodes, and (2) non-initPlan subplans don't
work either. There's certainly room for improvement in those
restrictions, but for the moment that's what we've got.
Amit Kapila, per report from Andreas Seltenreich
Discussion: <8737im6pmh.fsf@credativ.de>
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Because we use transformTargetList() for UPDATE as well as SELECT
tlists, the code accidentally tried to expand a "*" reference into
several columns. This is nonsensical, because the UPDATE syntax
provides exactly one target column to put the value into. The
immediate result was that transformUpdateTargetList() got confused
and reported "UPDATE target count mismatch --- internal error".
It seems better to treat such a reference as a plain whole-row
variable, as it would be in other contexts. (This could produce
useful results when the target column is of composite type.)
Fix by tweaking transformTargetList() to perform *-expansion only
conditionally, depending on its exprKind parameter.
Back-patch to 9.3. The problem exists further back, but a fix would be
much more invasive before that, because transformTargetList() wasn't
told what kind of list it was working on. Doesn't seem worth the
trouble given the lack of field reports. (I only noticed it because
I was checking the code while trying to improve the documentation about
how we handle "foo.*".)
Discussion: <4308.1479595330@sss.pgh.pa.us>
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create_merge_append_path should use the path rowcount it just computed,
not rel->tuples, for costing purposes. Those numbers should always be
the same at present, but if we ever support parameterized MergeAppend
paths (a case this function is otherwise prepared for), the former would
be right and the latter wrong.
No need for back-patch since the problem is only latent.
Ashutosh Bapat
Discussion: <CAFjFpRek+cLCnTo24youuGtsq4zRphEB8EUUPjDxZjnL4n4HYQ@mail.gmail.com>
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The serialization code dumped core for a string-valued GUC whose value
is NULL, which is a legal state. The infrastructure isn't capable of
transmitting that state exactly, but fortunately, transmitting an empty
string instead should be close enough (compare, eg, commit e45e990e4).
The code potentially underestimated the space required to format a
real-valued variable, both because it made an unwarranted assumption that
%g output would never be longer than %e output, and because it didn't count
right even for %e format. In practice this would pretty much always be
masked by overestimates for other variables, but it's still wrong.
Also fix boundary-case error in read_gucstate, incorrect handling of the
case where guc_sourcefile is non-NULL but zero length (not clear that can
happen, but if it did, this code would get totally confused), and
confusingly useless check for a NULL result from read_gucstate.
Andreas Seltenreich discovered the core dump; other issues noted while
reading nearby code. Back-patch to 9.5 where this code was introduced.
Michael Paquier and Tom Lane
Discussion: <871sy78wno.fsf@credativ.de>
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Like pg_tables, pg_views, and others, this view contains information
about sequences in a way that is independent of the system catalog
layout but more comprehensive than the information schema.
To help implement the view, add a new internal function
pg_sequence_last_value() to return the last value of a sequence. This
is kept separate from pg_sequence_parameters() to separate querying
run-time state from catalog-like information.
Reviewed-by: Andreas Karlsson <andreas@proxel.se>
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Add a loop to check that each test covers all of the pg_dump runs. We
(I) had been a bit sloppy when adding new runs and not making sure to
mark if they should be under like or unlike for each test, this loop
makes sure that the test system will complain if any are forgotten in
the future.
The loop also correctly handles the 'catch all' cases, which are used to
avoid running unnecessary specific checks when a single catch-all can be
done (eg: a no-acl run should not have any GRANT commands).
Also, re-enable the testing of blobs, but use lo_from_bytea() instead of
trying to be cute and writing out to a file and then reading it back in
with psql, which proved to be difficult for some buildfarm members.
This allows us to add support for testing the --no-blobs option which
will be getting added shortly, provided the buildfarm doesn't blow up on
this.
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The debug messages that merely print StartTransactionCommand,
CommitTransactionCommand, ProcessUtilty, or ProcessQuery with no
additional details seem to be useless. Get rid of them.
The transaction status messages produced by ShowTransactionState are
occasionally useful, but they are extremely verbose, producing
multiple lines of log output every time they fire, which can happens
multiple times per transaction. So, reduce the level to DEBUG5; avoid
emitting an extra line just to explain which debug point is at issue;
and tighten up the rest of the message so it doesn't use quite so much
horizontal space.
With these changes, it's possible to run a somewhat busy system with a
log level even as high as DEBUG4, whereas previously anything above
DEBUG2 would flood the log with output that probably wasn't really all
that useful.
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pg_dump's traditional solution for breaking a circular dependency involving
a view was to create the view with CREATE TABLE and then later issue CREATE
RULE "_RETURN" ... to convert the table to a view, relying on the backend's
very very ancient code that supports making views that way. We've wanted
to get rid of that kluge for a long time, but the thing that finally
motivates doing something about it is the recognition that this method
fails with the --clean option, because it leads to issuing DROP RULE
"_RETURN" followed by DROP TABLE --- and the backend won't let you drop a
view's _RETURN rule.
Instead, let's break circular dependencies by initially creating the view
using CREATE VIEW AS SELECT NULL::columntype AS columnname, ... (so that
it has the right column names and types to support external references,
but no dependencies beyond the column data types), and then later dumping
the ON SELECT rule using the spelling CREATE OR REPLACE VIEW. This method
wasn't available when this code was originally written, but it's been
possible since PG 7.3, so it seems fine to start relying on it now.
To solve the --clean problem, make the dropStmt for an ON SELECT rule
be CREATE OR REPLACE VIEW with the same dummy target list as above.
In this way, during the DROP phase, we first reduce the view to have
no extra dependencies, and then we can drop it entirely when we've
gotten rid of whatever had a circular dependency on it.
(Note: this should work adequately well with the --if-exists option, since
the CREATE OR REPLACE VIEW will go through whether the view exists or not.
It could fail if the view exists with a conflicting column set, but we
don't really support --clean against a non-matching database anyway.)
This allows cleaning up some other kluges inside pg_dump, notably that
we don't need a notion of reloptions attached to a rule anymore.
Although this is a bug fix, commit to HEAD only for now. The problem's
existed for a long time and we've had relatively few complaints, so it
doesn't really seem worth taking risks to fix it in the back branches.
We might revisit that choice if no problems emerge.
Discussion: <19092.1479325184@sss.pgh.pa.us>
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Teach it not to complain if the dropStmt attached to an archive entry
is actually spelled CREATE OR REPLACE VIEW, since that will happen due to
an upcoming bug fix. Also, if it doesn't recognize a dropStmt, have it
print a WARNING and then emit the dropStmt unmodified. That seems like a
much saner behavior than Assert'ing or dumping core due to a null-pointer
dereference, which is what would happen before :-(.
Back-patch to 9.4 where this option was introduced.
Discussion: <19092.1479325184@sss.pgh.pa.us>
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Cleanup for recent patches --- it's not much change, but I got annoyed
while re-indenting the view-rule fix I'm working on.
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Replay of XLOG_BTREE_VACUUM during Hot Standby was previously thought to
require complex interlocking that matched the requirements on the
master. This required an O(N) operation that became a significant
problem with large indexes, causing replication delays of seconds or in
some cases minutes while the XLOG_BTREE_VACUUM was replayed.
This commit skips the “pin scan” that was previously required, by
observing in detail when and how it is safe to do so, with full
documentation. The pin scan is skipped only in replay; the VACUUM code
path on master is not touched here.
No tests included. Manual tests using an additional patch to view WAL records
and their timing have shown the change in WAL records and their handling has
successfully reduced replication delay.
This is a back-patch of commits 687f2cd7a015, 3e4b7d87988f, b60284261375
by Simon Riggs, to branches 9.4 and 9.5. No further backpatch is
possible because this depends on catalog scans being MVCC. I (Álvaro)
additionally updated a slight problem in the README, which explains why
this touches the 9.6 and master branches.
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This should always be true, but since we're relying on a tuple descriptor
passed from outside pltcl itself, let's check. Per a gripe from Coverity.
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Previously, the handle for the control segment could not be zero, but
some other DSM segment could potentially have a handle value of zero.
However, that means that if someone wanted to store a dsm_handle that
might or might not be valid, they would need a separate boolean to
keep track of whether the associated value is legal. That's annoying,
so change things so that no DSM segment can ever have a handle of 0 -
or as we call it here, DSM_HANDLE_INVALID.
Thomas Munro. This was submitted as part of a much larger patch to
add an malloc-like allocator for dynamic shared memory, but this part
seems like a good idea independently of the rest of the patch.
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On Windows, libc will mask \r\n line endings for us, since we read the
password file in text mode. But that doesn't happen on Unix. People
who share password files across both systems might have \r\n line endings
in a file they use on Unix, so as a convenience, ignore trailing \r.
Per gripe from Josh Berkus.
In passing, put the existing check for empty line somewhere where it's
actually useful, ie after stripping the newline not before.
Vik Fearing, adjusted a bit by me
Discussion: <0de37763-5843-b2cc-855e-5d0e5df25807@agliodbs.com>
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The CatalogSnapshot was not plugged into SnapshotResetXmin()'s accounting
for whether MyPgXact->xmin could be cleared or advanced. In normal
transactions this was masked by the fact that the transaction snapshot
would be older, but during backend startup and certain utility commands
it was possible to re-use the CatalogSnapshot after MyPgXact->xmin had
been cleared, meaning that recently-deleted rows could be pruned even
though this snapshot could still see them, causing unexpected catalog
lookup failures. This effect appears to be the explanation for a recent
failure on buildfarm member piculet.
To fix, add the CatalogSnapshot to the RegisteredSnapshots heap whenever
it is valid.
In the previous logic, it was possible for the CatalogSnapshot to remain
valid across waits for client input, but with this change that would mean
it delays advance of global xmin in cases where it did not before. To
avoid possibly causing new table-bloat problems with clients that sit idle
for long intervals, add code to invalidate the CatalogSnapshot before
waiting for client input. (When the backend is busy, it's unlikely that
the CatalogSnapshot would be the oldest snap for very long, so we don't
worry about forcing early invalidation of it otherwise.)
In passing, remove the CatalogSnapshotStale flag in favor of using
"CatalogSnapshot != NULL" to represent validity, as we do for the other
special snapshots in snapmgr.c. And improve some obsolete comments.
No regression test because I don't know a deterministic way to cause this
failure. But the stress test shown in the original discussion provokes
"cache lookup failed for relation 1255" within a few dozen seconds for me.
Back-patch to 9.4 where MVCC catalog scans were introduced. (Note: it's
quite easy to produce similar failures with the same test case in branches
before 9.4. But MVCC catalog scans were supposed to fix that.)
Discussion: <16447.1478818294@sss.pgh.pa.us>
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Gigantic numbers of tapes don't work out well.
Original patch by Peter Geoghegan; comments entirely rewritten by me.
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This has been wrong for a very long time, and it's puzzling to me how
it ever worked for anyone.
Kyotaro Horiguchi
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Commit 41124a91e61fc6d9681c1e8b15ba30494e84d643 allowed the
transaction log file prefix to be changed but left in place the
existing 64-character limit on the total length of a log file name.
It's possible that could be inconvenient for somebody, so increase the
limit to MAXPGPATH, which ought to be enough for anybody.
Per a suggestion from Tom Lane.
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This allows us to avoid running the regression tests in contrib modules
like pg_stat_statement in a less ugly manner.
Discussion: <22432.1478968242@sss.pgh.pa.us>
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The function was renamed in 908e23473, but the comment never learned
about it.
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Add a new optional Makefile variable PROVE_TESTS that, if passed as a
space-separated list of paths relative to the Makefile invoking
$(prove_check) or $(prove_installcheck), runs just those tests instead
of t/*.pl .
From: Craig Ringer <craig@2ndquadrant.com>
Reviewed-by: Michael Paquier <michael.paquier@gmail.com>
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Previously, pg_upgrade migrated sequence data like tables by copying the
on-disk file. This does not allow any changes in the on-disk format for
sequences. It's simpler to just have pg_dump set the new sequence
values as it normally does. To do that, create a hidden submode in
pg_dump that dumps sequence data even when a schema-only dump is
requested, and trigger that submode in binary upgrade mode. (This new
submode could easily be exposed as a command-line option, but it has
limited use outside of pg_dump and would probably cause some confusion,
so we don't do that at this time.)
Reviewed-by: Anastasia Lubennikova <a.lubennikova@postgrespro.ru>
Reviewed-by: Michael Paquier <michael.paquier@gmail.com>
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Instead of handling both sequence data and table data internally as
"table data", handle sequences separately under a "sequence set" type.
We already handled materialized view data differently, so it makes the
code somewhat cleaner to handle each relation kind separately at the top
level.
This does not change the output format, since there already was a
separate "SEQUENCE SET" archive entry type. A noticeable difference is
that SEQUENCE SET entries now always appear after TABLE DATA entries.
And in parallel mode there is less sorting to do, because the sequence
data entries are no longer considered table data.
Reviewed-by: Anastasia Lubennikova <a.lubennikova@postgrespro.ru>
Reviewed-by: Michael Paquier <michael.paquier@gmail.com>
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Be sure to pull up the subquery's hasRowSecurity flag when flattening a
subquery in pull_up_simple_subquery(). This isn't a bug today because
we don't look at the hasRowSecurity flag during planning, but it could
easily be a bug tomorrow.
Likewise, make rewriteRuleAction() pull up the hasRowSecurity flag when
absorbing RTEs from a rule action. This isn't a bug either, for the
opposite reason: the flag should never be set yet. But again, it seems
like good future proofing.
Add a comment explaining why rewriteTargetView() should *not* set
hasRowSecurity when adding stuff to securityQuals.
Improve some nearby comments about securityQuals processing, and document
that field more completely in parsenodes.h.
Patch by me, analysis by Dean Rasheed.
Discussion: <CAEZATCXZ8tb2DV6f=bkhsMV6u_gRcZ0CZBw2J-qU84RxSukZog@mail.gmail.com>
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The reloptions stuff allows this option to be set on a matview.
While it's questionable whether that is useful or was really intended,
it does work, and we shouldn't change that in minor releases. Commit
e3e66d8a9 disabled the option since I didn't realize that it was
possible for it to be set on a matview. Tweak the test to re-allow it.
Discussion: <19749.1478711862@sss.pgh.pa.us>
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We just pass the data to the INSTEAD trigger.
Haribabu Kommi, reviewed by Dilip Kumar
Patch: <CAJrrPGcSQkrNkO+4PhLm4B8UQQQmU9YVUuqmtgM=pmzMfxWaWQ@mail.gmail.com>
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The plan generated for sorted partial aggregation with "GROUP BY constant"
included a Sort node with no sort keys, which the executor does not like.
Per report from Steve Randall. I'd add a regression test case if I could
think of a compact one, but it doesn't seem worth expending lots of cycles
on.
Report: <CABVd52UAdGXpg_rCk46egpNKYdXOzCjuJ1zG26E2xBe_8bj+Fg@mail.gmail.com>
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Masahiko Sawada, reviewed by Fabien Coelho and Beena Emerson, with
some a bit of wordsmithing and cosmetic adjustment by me.
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The idea behind SPI_push was to allow transitioning back into an
"unconnected" state when a SPI-using procedure calls unrelated code that
might or might not invoke SPI. That sounds good, but in practice the only
thing it does for us is to catch cases where a called SPI-using function
forgets to call SPI_connect --- which is a highly improbable failure mode,
since it would be exposed immediately by direct testing of said function.
As against that, we've had multiple bugs induced by forgetting to call
SPI_push/SPI_pop around code that might invoke SPI-using functions; these
are much harder to catch and indeed have gone undetected for years in some
cases. And we've had to band-aid around some problems of this ilk by
introducing conditional push/pop pairs in some places, which really kind
of defeats the purpose altogether; if we can't draw bright lines between
connected and unconnected code, what's the point?
Hence, get rid of SPI_push[_conditional], SPI_pop[_conditional], and the
underlying state variable _SPI_curid. It turns out SPI_restore_connection
can go away too, which is a nice side benefit since it was never more than
a kluge. Provide no-op macros for the deleted functions so as to avoid an
API break for external modules.
A side effect of this removal is that SPI_palloc and allied functions no
longer permit being called when unconnected; they'll throw an error
instead. The apparent usefulness of the previous behavior was a mirage
as well, because it was depended on by only a few places (which I fixed in
preceding commits), and it posed a risk of allocations being unexpectedly
long-lived if someone forgot a SPI_push call.
Discussion: <20808.1478481403@sss.pgh.pa.us>
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For ALTER TYPE .. RENAME, add "VALUE" to the list of possible
completions. Complete ALTER TYPE .. RENAME VALUE with possible
enum values. After that, complete with "TO".
Dagfinn Ilmari Mannsåker, reviewed by Artur Zakirov.
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Invent a new function heap_modify_tuple_by_cols() that is functionally
equivalent to SPI_modifytuple except that it always allocates its result
by simple palloc. I chose however to make the API details a bit more
like heap_modify_tuple: pass a tupdesc rather than a Relation, and use
bool convention for the isnull array.
Use this function in place of SPI_modifytuple at all call sites where the
intended behavior is to allocate in current context. (There actually are
only two call sites left that depend on the old behavior, which makes me
wonder if we should just drop this function rather than keep it.)
This new function is easier to use than heap_modify_tuple() for purposes
of replacing a single column (or, really, any fixed number of columns).
There are a number of places where it would simplify the code to change
over, but I resisted that temptation for the moment ... everywhere except
in plpgsql's exec_assign_value(); changing that might offer some small
performance benefit, so I did it.
This is on the way to removing SPI_push/SPI_pop, but it seems like
good code cleanup in its own right.
Discussion: <9633.1478552022@sss.pgh.pa.us>
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Michael Paquier
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There's basically no scenario where it's sensible for this to match
dropped columns, so put a test for dropped-ness into SPI_fnumber()
itself, and excise the test from the small number of callers that
were paying attention to the case. (Most weren't :-(.)
In passing, normalize tests at call sites: always reject attnum <= 0
if we're disallowing system columns. Previously there was a mixture
of "< 0" and "<= 0" tests. This makes no practical difference since
SPI_fnumber() never returns 0, but I'm feeling pedantic today.
Also, in the places that are actually live user-facing code and not
legacy cruft, distinguish "column not found" from "can't handle
system column".
Per discussion with Jim Nasby; thi supersedes his original patch
that just changed the behavior at one call site.
Discussion: <b2de8258-c4c0-1cb8-7b97-e8538e5c975c@BlueTreble.com>
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The intent of the test is to check whether XLOG_SEG_SIZE is in a
particular range, but actually in one case it compares XLOG_BLCKSZ
by mistake. Repair.
Commit 88e982302684246e8af785e78a467ac37c76dee9 introduced this
faulty test.
Kuntal Ghosh, reviewed by Michael Paquier.
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The code here would need some change anyway given planned change in
SPI_modifytuple semantics, since this executes after we've exited the
SPI environment. But really it's better to just use heap_modify_tuple.
While at it, normalize use of SPI_fnumber: make error messages distinguish
no-such-column from can't-set-system-column, and remove test for deleted
column which is going to migrate into SPI_fnumber. The lack of a check
for system column names is actually a pre-existing bug here, and might
even qualify as a security bug except that we don't have any trusted
version of plpython.
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The code here would need some change anyway given planned change in
SPI_modifytuple semantics, since this executes after we've exited the
SPI environment. But really it's better to just use heap_modify_tuple.
The code's actually shorter this way, and this avoids depending on some
rather indirect reasoning about why the temporary arrays can't be overrun.
(I think the old code is safe, as long as Perl hashes can't contain
duplicate keys; but with this way we don't need that assumption, only
the assumption that SPI_fnumber doesn't return an out-of-range attnum.)
While at it, normalize use of SPI_fnumber: make error messages distinguish
no-such-column from can't-set-system-column, and remove test for deleted
column which is going to migrate into SPI_fnumber.
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When squeezing a bucket during vacuum, it's not necessary to retain
any tuples already marked as dead, so ignore them when deciding which
tuples must be moved in order to empty a bucket page. Similarly, when
splitting a bucket, relocating dead tuples to the new bucket is a
waste of effort; instead, just ignore them.
Amit Kapila, reviewed by me. Testing help provided by Ashutosh
Sharma.
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In each case, absence of a trailing newline would itself constitute a
PostgreSQL bug. Therefore, this slightly enhances the changed tests.
This works around a bug that last appeared in Perl 5.8.8, fixing
src/test/modules/test_pg_dump when run against that version. Commit
e7293e3271bf618eeb2d4779a15fc516a69fe463 worked around the bug, but the
subsequent addition of test_pg_dump introduced affected code. As that
commit had shown, slight increases in pattern complexity can suppress
the bug. This commit edits qr/foo$/m patterns too complex to encounter
the bug today, for style consistency and robustness against unrelated
pattern changes. Back-patch to 9.6, where test_pg_dump was introduced.
As of this writing, a fresh MSYS installation includes an affected Perl
5.8.8. The Perl 5.8.8 in Red Hat Enterprise Linux 5.11 carries a patch
that renders it unaffected, but the Perl 5.8.5 of Red Hat Enterprise
Linux 4.4 is affected.
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We really ought to make StdRdOptions and the other decoded forms of
reloptions self-identifying, but for the moment, assume that only plain
relations could possibly be user_catalog_tables. Fixes problem with bogus
"ON CONFLICT is not supported on table ... used as a catalog table" error
when target is a view with cascade option.
Discussion: <26681.1477940227@sss.pgh.pa.us>
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macro."
This reverts commit c8ead2a3974d3eada145a0e18940150039493cc9.
Seems there is no way to do this that doesn't cause MSVC to give
warnings, so let's just go back to the way we've been doing it.
Discussion: <11843.1478358206@sss.pgh.pa.us>
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Reviewed-by: Michael Paquier <michael.paquier@gmail.com>
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In pg_log_v(), we need to translate the fmt before processing, not the
formatted message afterwards.
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Use a macro to generate the in and out functions for pseudotypes that
reject all input and output, saving many lines of redundant code.
Parameterize the error messages to reduce translatable strings.
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Meant to do this in 26abb50c4, but forgot.
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Jim Nasby, rather heavily editorialized by me
Patch: <f2134651-14b3-efeb-f274-c69f3c084031@BlueTreble.com>
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Use Tcl_ListObjGetElements instead of Tcl_SplitList. Aside from being
possibly more efficient in its own right, this means we are no longer
responsible for freeing a malloc'd result array, so we can get rid of
a PG_TRY/PG_CATCH block.
Use heap_form_tuple instead of SPI_modifytuple. We don't need the
extra generality of the latter, since we're always replacing all
columns. Nor do we need its memory-context-munging, since at this
point we're already out of the SPI environment.
Per comparison of this code to tuple-building code submitted by Jim Nasby.
I've abandoned the thought of merging the two cases into a single routine,
but we may as well make the older code simpler and faster where we can.
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