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~> (cube, int) operator was especially designed for knn-gist search.
However, knn-gist supports only ascending ordering of results. Nevertheless
it would be useful to support descending ordering by ~> (cube, int) operator.
We provide workaround for that: negative coordinate give us inversed value
of corresponding cube bound. Therefore, knn search using negative coordinate
gives us an effect of descending ordering by cube bound.
Author: Alexander Korotkov
Reviewed by: Tomas Vondra, Andrey Borodin
Discussion: https://www.postgresql.org/message-id/flat/a9657f6a-b497-36ff-e56-482a2c7e3292@2ndquadrant.com
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~> (cube, int) operator was especially designed for knn-gist search.
However, it appears that knn-gist search can't work correctly with current
behavior of this operator when dataset contains cubes of variable
dimensionality. In this case, the same value of second operator argument
can point to different dimension depending on dimensionality of particular cube.
Such behavior is incompatible with gist indexing of cubes, and knn-gist doesn't
work correctly for it.
This patch changes behavior of ~> (cube, int) operator by introducing dimension
numbering where value of second argument unambiguously identifies number of
dimension. With new behavior, this operator can be correctly supported by
knn-gist. Relevant changes to cube operator class are also included.
Backpatch to v9.6 where operator was introduced.
Since behavior of ~> (cube, int) operator is changed, depending entities
must be refreshed after upgrade. Such as, expression indexes using this
operator must be reindexed, materialized views must be rebuilt, stored
procedures and client code must be revised to correctly use new behavior.
That should be mentioned in release notes.
Noticed by: Tomas Vondra
Author: Alexander Korotkov
Reviewed by: Tomas Vondra, Andrey Borodin
Discussion: https://www.postgresql.org/message-id/flat/a9657f6a-b497-36ff-e56-482a2c7e3292@2ndquadrant.com
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These functions are stated to be Oracle-compatible, but they weren't.
Yugo Nagata noticed that while our code returns zero for a zero or
negative fourth parameter (occur_index), Oracle throws an error.
Further testing by me showed that there was also a discrepancy in the
interpretation of a negative third parameter (beg_index): Oracle thinks
that a negative beg_index indicates the last place where the target
substring can *begin*, whereas our code thinks it is the last place
where the target can *end*.
Adjust the sample code to behave like Oracle in both these respects.
Also change it to be a CDATA[] section, simplifying copying-and-pasting
out of the documentation source file. And fix minor problems in the
introductory comment, which wasn't very complete or accurate.
Back-patch to all supported branches. Although this patch only touches
documentation, we should probably call it out as a bug fix in the next
minor release notes, since users who have adopted the functions will
likely want to update their versions.
Yugo Nagata and Tom Lane
Discussion: https://postgr.es/m/20171229191705.c0b43a8c.nagata@sraoss.co.jp
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PL/pgSQL "pins" internally generated portals so that user code cannot
close them by guessing their names. Add this functionality to PL/Perl
and PL/Python as well, preventing users from manually closing cursors
created by spi_query and plpy.cursor, respectively. (PL/Tcl does not
currently offer any cursor functionality.)
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Existing tests only covered returning explicitly named portals as
refcursor. The unnamed cursor case was recently broken without a test
failing.
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This reverts commit b3617cdfbba1b5381e9d1c6bc0839500e8eb7273.
This broke returning unnamed cursors from PL/pgSQL functions.
Apparently, there are no test cases for this.
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It seems incorrect to assume that the list of CkptSortItems can never
contain duplicate page numbers: concurrent activity could result in some
page getting dropped from a low-numbered buffer and later loaded into a
high-numbered buffer while BufferSync is scanning the buffer pool.
If that happened, the comparator would give self-inconsistent results,
potentially confusing qsort(). Saving one comparison step is not worth
possibly getting the sort wrong.
So far as I can tell, nothing would actually go wrong given our current
implementation of qsort(). It might get a bit slower than expected
if there were a large number of duplicates of one value, but that's
surely a probability-epsilon case. Still, the comment is wrong,
and if we ever switched to another sort implementation it might be
less forgiving.
In passing, avoid casting away const-ness of the argument pointers;
I've not seen any compiler complaints from that, but it seems likely
that some compilers would not like it.
Back-patch to 9.6 where this code came in, just in case I've underestimated
the possible consequences.
Discussion: https://postgr.es/m/18437.1515607610@sss.pgh.pa.us
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Without this, Parallel Append can end up with extra children.
Report by Rajkumar Raghuwanshi. Fix by Amit Khandekar. Brown
paper bag bug by me.
Discussion: http://postgr.es/m/CAKcux6mBF-NiddyEe9LwymoUC5+wh8bQJ=uk2gGkOE+L8cv=LA@mail.gmail.com
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PL/pgSQL "pins" internally generated (unnamed) portals so that user code
cannot close them by guessing their names. This logic is also useful in
other languages and really for any code. So move that logic into SPI.
An unnamed portal obtained through SPI_cursor_open() and related
functions is now automatically pinned, and SPI_cursor_close()
automatically unpins a portal that is pinned.
In the core distribution, this affects PL/Perl and PL/Python, preventing
users from manually closing cursors created by spi_query and
plpy.cursor, respectively. (PL/Tcl does not currently offer any cursor
functionality.)
Reviewed-by: Andrew Dunstan <andrew.dunstan@2ndquadrant.com>
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The previous code gave the same error message for attempting to drop
pinned and active portals, but those are separate states, so give
separate error messages.
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Commit bc7fa0c15c590ddf4872e426abd76c2634f22aca accidentally lost fixes of
0aa1d489ea756b96b6d5573692ae9cd5d143c2a5 commit.
Thanks to Thomas Munro
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Reported-by: Ashutosh Sharma
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Previously aggregate transition and combination functions were invoked
by special case code in nodeAgg.c, evaluating input and filters
separately using the expression evaluation machinery. That turns out
to not be great for performance for several reasons:
- repeated expression evaluations have some cost
- the transition functions invocations are poorly predicted, as
commonly there are multiple aggregates in a query, resulting in the
same call-stack invoking different functions.
- filter and input computation had to be done separately
- the special case code made it hard to implement JITing of the whole
transition function invocation
Address this by building one large expression that computes input,
evaluates filters, and invokes transition functions.
This leads to moderate speedups in queries bottlenecked by aggregate
computations, and enables large speedups for similar cases once JITing
is done.
There's potential for further improvement:
- It'd be nice if we could simplify the somewhat expensive
aggstate->all_pergroups lookups.
- right now there's still an advance_transition_function invocation in
nodeAgg.c, leading to some code duplication.
Author: Andres Freund
Discussion: https://postgr.es/m/20170901064131.tazjxwus3k2w3ybh@alap3.anarazel.de
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As src/backend/access/transam/README says, PageGetLSN may only be called
by processes holding either exclusive lock on buffer, or a shared lock
on buffer plus buffer header lock. Therefore any place that only holds
a shared buffer lock must use BufferGetLSNAtomic instead of PageGetLSN,
which internally obtains buffer header lock prior to reading the LSN.
A few callsites failed to comply with this rule. This was detected by
running all tests under a new (not committed) assertion that verifies
PageGetLSN locking contract. All but one of the callsites that failed
the assertion are fixed by this patch. Remaining callsites were
inspected manually and determined not to need any change.
The exception (unfixed callsite) is in TestForOldSnapshot, which only
has a Page argument, making it impossible to access the corresponding
Buffer from it. Fixing that seems a much larger patch that will have to
be done separately; and that's just as well, since it was only
introduced in 9.6 and other bugs are much older.
Some of these bugs are ancient; backpatch all the way back to 9.3.
Authors: Jacob Champion, Asim Praveen, Ashwin Agrawal
Reviewed-by: Michaël Paquier
Discussion: https://postgr.es/m/CABAq_6GXgQDVu3u12mK9O5Xt5abBZWQ0V40LZCE+oUf95XyNFg@mail.gmail.com
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These are compatible with Oracle and required for the datetime template
language for jsonpath in an upcoming patch.
Nikita Glukhov and Andrew Dunstan, reviewed by Pavel Stehule.
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After having gotten rid of PortalGetHeapMemory(), there seems little
reason to keep one Portal access macro around that offers no actual
abstraction and isn't consistently used anyway.
Reviewed-by: Andrew Dunstan <andrew.dunstan@2ndquadrant.com>
Reviewed-by: Alvaro Herrera <alvherre@alvh.no-ip.org>
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Rename PortalMemory to TopPortalContext, to avoid confusion with
PortalContext and align naming with similar top-level memory contexts.
Rename PortalData's "heap" field to portalContext. The "heap" naming
seems quite antiquated and confusing. Also get rid of the
PortalGetHeapMemory() macro and access the field directly, which we do
for other portal fields, so this abstraction doesn't buy anything.
Reviewed-by: Andrew Dunstan <andrew.dunstan@2ndquadrant.com>
Reviewed-by: Alvaro Herrera <alvherre@alvh.no-ip.org>
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The initial implementation of list_qsort(), from commit ab7271677,
re-used the ListCells of the input list while not touching the List
header. This meant that anybody who still had a pointer to the
original header would now be in possession of a corrupted list,
a problem that seems sure to bite us eventually.
One possible solution is to re-use the original List header as well,
giving the function the semantics of update-in-place. However, that
doesn't seem like a very good idea either given the way that the
function is used in the planner: create_path functions aren't normally
supposed to modify their input lists. It doesn't look like there would
be a problem today, but it's not hard to foresee a time when modifying
a list of Paths in-place could have side-effects on some other append
path.
On the whole, and in view of the likelihood that this function might
be used in other contexts in the future, it seems best to get rid of
the micro-optimization of re-using the input list cells. Just build
a new list.
Discussion: https://postgr.es/m/16912.1515449066@sss.pgh.pa.us
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Commit ab7271677 introduced code that attempts to order the child
scans of a Parallel Append node in a way that will minimize execution
time, based on total cost and startup cost. However, it failed to
think hard about what to do when estimated costs are exactly equal;
a case that's particularly likely to occur when comparing on startup
cost. In such a case the ordering of the child paths would be left
to the whims of qsort, an algorithm that isn't even stable.
We can improve matters by applying the rule used elsewhere in the
planner: if total costs are equal, sort on startup cost, and
vice versa. When both cost estimates are exactly equal, rather
than letting qsort do something unpredictable, sort based on the
child paths' relids, which should typically result in sorting in
inheritance order. (The latter provision requires inventing a
qsort-style comparator for bitmapsets, but maybe we'll have use
for that for other reasons in future.)
This results in a few plan changes in the select_parallel test,
but those all look more reasonable than before, when the actual
underlying cost numbers are taken into account.
Discussion: https://postgr.es/m/4944.1515446989@sss.pgh.pa.us
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The general assumption for postmaster child processes is that they
should just exit(1), reasonably promptly, if the postmaster disappears.
condition_variable.c neglected this consideration and could be left
waiting forever, if the counterpart process it is waiting for has
done the right thing and exited.
We had some discussion of adjusting the WaitEventSet API to make it
harder to make this type of mistake in future; but for the moment,
and for v10, let's make this narrow fix.
Discussion: https://postgr.es/m/20412.1515456143@sss.pgh.pa.us
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Add a function to TestLib that allows us to check pg_config.h and then
decide the expected test outcome based on that.
Author: Michael Paquier <michael.paquier@gmail.com>
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replorigin_drop() misunderstood the API for condition variables: it
had ConditionVariablePrepareToSleep and ConditionVariableCancelSleep
inside its test-and-sleep loop, rather than outside the loop as
intended. The net effect is a narrow race-condition window wherein,
if the process using a replication slot releases it immediately after
replorigin_drop() releases the ReplicationOriginLock, replorigin_drop()
would get into the condition variable's wait list too late and then
wait indefinitely for a signal that won't come.
Because there's a different CV for each replication slot, we can't
just move the ConditionVariablePrepareToSleep call to above the
test-and-sleep loop. What we can do, in the wake of commit 13db3b936,
is drop the ConditionVariablePrepareToSleep call entirely. This fix
depends on that commit because (at least in principle) the slot matching
the target replication origin might move around, so that once in a blue
moon successive loop iterations might involve different CVs. We can now
cope with such a scenario, at the cost of an extra trip through the
retry loop.
(There are ways we could fix this bug without depending on that commit,
but they're all a lot more complicated than this way.)
While at it, upgrade the rather skimpy comments in this function.
Back-patch to v10 where this code came in.
Discussion: https://postgr.es/m/19947.1515455433@sss.pgh.pa.us
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The original coding here insisted that callers manually cancel any prepared
sleep for one condition variable before starting a sleep on another one.
While that's not a huge burden today, it seems like a gotcha that will bite
us in future if the use of condition variables increases; anything we can
do to make the use of this API simpler and more robust is attractive.
Hence, allow these functions to automatically switch their attention to
a different CV when required. This is safe for the same reason it was OK
for commit aced5a92b to let a broadcast operation cancel any prepared CV
sleep: whenever we return to the other test-and-sleep loop, we will
automatically re-prepare that CV, paying at most an extra test of that
loop's exit condition.
Back-patch to v10 where condition variables were introduced. Ordinarily
we would probably not back-patch a change like this, but since it does not
invalidate any coding pattern that was legal before, it seems safe enough.
Furthermore, there's an open bug in replorigin_drop() for which the
simplest fix requires this. Even if we chose to fix that in some more
complicated way, the hazard would remain that we might back-patch some
other bug fix that requires this behavior.
Patch by me, reviewed by Thomas Munro.
Discussion: https://postgr.es/m/2437.1515368316@sss.pgh.pa.us
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There are plans to extend the syntax for ANALYZE, so we need to break
the link between VacuumStmt and AnalyzeStmt. But apart from that, the
syntax above is undocumented and, if discovered by users, might give
the impression that the VERBOSE option for VACUUM differs from the
verbose option from ANALYZE, which it does not.
Nathan Bossart, reviewed by Michael Paquier and Masahiko Sawada
Discussion: http://postgr.es/m/D3FC73E2-9B1A-4DB4-8180-55F57D116B4E@amazon.com
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Added:
- variable now might contain integer, double, boolean and null values
- functions ln, exp
- logical AND/OR/NOT
- bitwise AND/OR/NOT/XOR
- bit right/left shift
- comparison operators
- IS [NOT] (NULL|TRUE|FALSE)
- conditional choice (in form of when/case/then)
New operations and functions allow to implement more complicated test scenario.
Author: Fabien Coelho with minor editorization by me
Reviewed-By: Pavel Stehule, Jeevan Ladhe, me
Discussion: https://www.postgresql.org/message-id/flat/alpine.DEB.2.10.1604030742390.31618@sto
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RELATION_IS_OTHER_TEMP is tested in the caller, not here.
Discussion: http://postgr.es/m/5A5438E4.3090709@lab.ntt.co.jp
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Previously an inaccurate but harmless error was generated when running
--check on a live server before reporting the servers as compatible.
The fix is to split error reporting and exit control in the exec_prog()
API.
Reported-by: Daniel Westermann
Backpatch-through: 10
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Clarify a bunch of comments.
Discussion: https://postgr.es/m/CAEepm=0NWKehYw7NDoUSf8juuKOPRnCyY3vuaSvhrEWsOTAa3w@mail.gmail.com
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Previously, although the initial state of a proclist_node is expected
to be next == prev == 0, proclist_delete_offset would reset nodes to
next == prev == INVALID_PGPROCNO when removing them from a list.
This is the same state that a node in a singleton list has, so that
it's impossible to distinguish not-in-a-list from in-a-list. Change
proclist_delete_offset to reset removed nodes to next == prev == 0,
making it possible to distinguish those cases, and then add Asserts
to the list add and delete functions that the supplied node isn't
or is in a list at entry. Also tighten assertions about the node
being in the particular list (not some other one) where it is possible
to check that in O(1) time.
In ConditionVariablePrepareToSleep, since we don't expect the process's
cvWaitLink to already be in a list, remove the more-or-less-useless
proclist_contains check; we'd rather have proclist_push_tail's new
assertion fire if that happens.
Improve various comments related to proclists, too.
Patch by me, reviewed by Thomas Munro. This isn't back-patchable, since
there could theoretically be inlined copies of proclist_delete_offset in
third-party modules. But it's only improving debuggability anyway.
Discussion: https://postgr.es/m/CAEepm=0NWKehYw7NDoUSf8juuKOPRnCyY3vuaSvhrEWsOTAa3w@mail.gmail.com
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In commit 561885db0, as part of normalizing RemovePgTempFiles's error
handling, I removed its behavior of silently ignoring ENOENT failures
during directory opens. Thomas Munro points out that this is a bad idea at
the top level, because we don't create pgsql_tmp directories until needed.
Thus this coding could produce LOG messages in perfectly normal situations,
which isn't what I intended. Restore the suppression of ENOENT logging,
but only at top level --- it would still be unexpected for a nested temp
directory to disappear between seeing it in the parent directory and
opening it.
Discussion: https://postgr.es/m/CAEepm=2y06SehAkTnd5sU_eVqdv5P-=Srt1y5vYNQk6yVDVaPw@mail.gmail.com
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Allows new test to confirm timelines match
Author: Michael Paquier
Reviewed-by: David Steele
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25fff40798fc4ac11a241bfd9ab0c45c085e2212 introduced
default monitoring roles. Apply these corrections:
* Allow access to pg_stat_get_wal_senders()
by role pg_read_all_stats
* Correct comment in pg_stat_get_wal_receiver()
to show it is no longer superuser-only.
Author: Feike Steenbergen
Reviewed-by: Michael Paquier
Apply to HEAD, then later backpatch to 10
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In the wake of commit aced5a92b, the semantics of these results are
a bit squishy: we can tell whether we signaled some other process(es),
but we do not know which ones were real waiters versus mere sentinels
for ConditionVariableBroadcast operations. It does not help much that
ConditionVariableBroadcast will attempt to pass on the signal to the
next real waiter, because (a) there might not be one, and (b) that will
only happen awhile later, anyway. So these results could overstate how
much effect the calls really had.
However, no existing caller of either function pays any attention to its
result value, so it seems reasonable to just define that as a required
property of a correct algorithm. To encourage correctness and save some
tiny number of cycles, change both functions to return void.
Patch by me, per an observation by Thomas Munro. No back-patch, since
if any third parties happen to be using these functions, they might not
appreciate an API break in a minor release.
Discussion: https://postgr.es/m/CAEepm=0NWKehYw7NDoUSf8juuKOPRnCyY3vuaSvhrEWsOTAa3w@mail.gmail.com
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In the admittedly-very-unlikely case that AddWaitEventToSet fails,
ConditionVariablePrepareToSleep would error out after already having
set cv_sleep_target, which is probably bad, and after having already
set cv_wait_event_set, which is very bad. Transaction abort might or
might not clean up cv_sleep_target properly; but there is nothing
that would be aware that the WaitEventSet wasn't fully constructed,
so that all future condition variable sleeps would be broken.
We can easily guard against these hazards with slight restructuring.
Back-patch to v10 where condition_variable.c was introduced.
Discussion: https://postgr.es/m/CAEepm=0NWKehYw7NDoUSf8juuKOPRnCyY3vuaSvhrEWsOTAa3w@mail.gmail.com
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The original implementation of ConditionVariableBroadcast was, per its
self-description, "the dumbest way possible". Thomas Munro found out
it was a bit too dumb. An awakened process may immediately re-queue
itself, if the specific condition it's waiting for is not yet satisfied.
If this happens before ConditionVariableBroadcast is able to see the wait
queue as empty, then ConditionVariableBroadcast will re-awaken the same
process, repeating the cycle. Given unlucky timing this back-and-forth
can repeat indefinitely; loops lasting thousands of seconds have been
seen in testing.
To fix, add our own process to the end of the wait queue to serve as a
sentinel, and exit the broadcast loop once our process is not there
anymore. There are various special considerations described in the
comments, the principal disadvantage being that wakers can no longer
be sure whether they awakened a real waiter or just a sentinel. But in
practice nobody pays attention to the result of ConditionVariableSignal
or ConditionVariableBroadcast anyway, so that problem seems hypothetical.
Back-patch to v10 where condition_variable.c was introduced.
Tom Lane and Thomas Munro
Discussion: https://postgr.es/m/CAEepm=0NWKehYw7NDoUSf8juuKOPRnCyY3vuaSvhrEWsOTAa3w@mail.gmail.com
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At present, we always raise an ERROR if the partition constraint
is violated, but a pending patch for UPDATE tuple routing will
consider instead moving the tuple to the correct partition.
Refactor to make that simpler.
Amit Khandekar, reviewed by Amit Langote, David Rowley, and me.
Discussion: http://postgr.es/m/CAJ3gD9cue54GbEzfV-61nyGpijvjZgCcghvLsB0_nL8Nm8HzCA@mail.gmail.com
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Revert another part of 959ee6d267fb24e667fc64e9837a376e236e84a5 .
Backpatch-through: 10
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Revert part of 959ee6d267fb24e667fc64e9837a376e236e84a5 .
Backpatch-through: 10
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Backpatch-through: 9.4 (9.3 didn't need improving)
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Logical decoding's reorderbuffer.c may spill transaction files to disk
when transactions are large. These are supposed to be removed when they
become "too old" by xid; but file removal requires the boundary LSNs of
the transaction to be known. The final_lsn is only set when we see the
commit or abort record for the transaction, but nothing sets the value
for transactions that crash, so the removal code misbehaves -- in
assertion-enabled builds, it crashes by a failed assertion.
To fix, modify the final_lsn of transactions that don't have a value
set, to the LSN of the very latest change in the transaction. This
causes the spilled files to be removed appropriately.
Author: Atsushi Torikoshi
Reviewed-by: Kyotaro HORIGUCHI, Craig Ringer, Masahiko Sawada
Discussion: https://postgr.es/m/54e4e488-186b-a056-6628-50628e4e4ebc@lab.ntt.co.jp
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It seems we can't easily work around the lack of
X509_get_signature_nid(), so revert the previous attempts and just
disable the tls-server-end-point feature if we don't have it.
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<openssl/x509.h> is necessary to look into the X509 struct, used by
ac3ff8b1d8f98da38c53a701e6397931080a39cf.
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Generalize is_partition_attr to has_partition_attrs and make it
accessible from outside tablecmds.c. Change map_partition_varattnos
to clarify that it can be used for mapping between any two relations
in a partitioning hierarchy, not just parent -> child.
Amit Khandekar, reviewed by Amit Langote, David Rowley, and me.
Some comment changes by me.
Discussion: http://postgr.es/m/CAJ3gD9fWfxgKC+PfJZF3hkgAcNOy-LpfPxVYitDEXKHjeieWQQ@mail.gmail.com
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Apparently, X509_get_signature_nid() is only in fairly new OpenSSL
versions, so use the lower-level interface it is built on instead.
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Per buildfarm.
Discussion: https://postgr.es/m/ec295792-a69f-350f-6287-25a20e8f31d5@gmail.com
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Instead of having ExecSetupPartitionTupleRouting return multiple out
parameters, have it return a pointer to a structure containing all of
those different things. Also, provide and use a cleanup function,
ExecCleanupTupleRouting, instead of cleaning up all of the resources
allocated by ExecSetupPartitionTupleRouting individually.
Amit Khandekar, reviewed by Amit Langote, David Rowley, and me
Discussion: http://postgr.es/m/CAJ3gD9fWfxgKC+PfJZF3hkgAcNOy-LpfPxVYitDEXKHjeieWQQ@mail.gmail.com
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This adds a second standard channel binding type for SCRAM. It is
mainly intended for third-party clients that cannot implement
tls-unique, for example JDBC.
Author: Michael Paquier <michael.paquier@gmail.com>
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Instead of using our standard macro for this calculation, this code
did it itself ... and got it wrong, leading to incorrect display of
the null bitmap in some cases. Noted and fixed by Maksim Milyutin.
In passing, remove a uselessly duplicative error check.
Errors were introduced in commit d6061f83a; back-patch to 9.6
where that came in.
Maksim Milyutin, reviewed by Andrey Borodin
Discussion: https://postgr.es/m/ec295792-a69f-350f-6287-25a20e8f31d5@gmail.com
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As things stand now, channel binding data is fetched from OpenSSL and
saved into the SCRAM exchange context for any SSL connection attempted
for a SCRAM authentication, resulting in data fetched but not used if no
channel binding is used or if a different channel binding type is used
than what the data is here for.
Refactor the code in such a way that binding data is fetched from the
SSL stack only when a specific channel binding is used for both the
frontend and the backend. In order to achieve that, save the libpq
connection context directly in the SCRAM exchange state, and add a
dependency to SSL in the low-level SCRAM routines.
This makes the interface in charge of initializing the SCRAM context
cleaner as all its data comes from either PGconn* (for frontend) or
Port* (for the backend).
Author: Michael Paquier <michael.paquier@gmail.com>
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Some versions of Windows don't define LDAPS_PORT.
Also, Windows' ldap_sslinit() is documented to use LDAPS even if you
said secure=0 when the port number happens to be 636 or 3269. Let's
avoid using the port number to imply that you want LDAPS, so that
connection strings have the same meaning on Windows and Unix.
Author: Thomas Munro
Discussion: https://postgr.es/m/CAEepm%3D23B7GV4AUz3MYH1TKpTv030VHxD2Sn%2BLYWDv8d-qWxww%40mail.gmail.com
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