Previously, we passed the toplevel PlannerInfo, but we actually want
to pass the relevant subroot. One problem with passing the toplevel
PlannerInfo is that the FDW which wants to push down an UPDATE or
DELETE against a join won't find the relevant joinrel there.
As of commit 1bc0100d270e5bcc980a0629b8726a32a497e788, postgres_fdw
tries to do exactly this and can be made to fail an assertion as a
result.
It's possible that this should be regarded as a bug fix and
back-patched to earlier releases, but for lack of a test case that
fails in earlier releases, no back-patch for now.
Etsuro Fujita, reviewed by Amit Langote.
Discussion: http://postgr.es/m/5AF43E02.30000@lab.ntt.co.jp
The impact of VARIADIC on the combine/serialize/deserialize support
functions of an aggregate wasn't thought through carefully. There is
actually no impact, because variadicity isn't passed through to these
functions (and it doesn't seem like it would need to be). However,
lookup_agg_function was mistakenly told to check things as though it were
passed through. The net result was that it was impossible to declare an
aggregate that had both VARIADIC input and parallelism support functions.
In passing, fix a runtime check in nodeAgg.c for the combine function's
strictness to make its error message agree with the creation-time check.
The previous message was actually backwards, and it doesn't seem like
there's a good reason to have two versions of this message text anyway.
Back-patch to 9.6 where parallel aggregation was introduced.
Alexey Bashtanov; message fix by me
Discussion: https://postgr.es/m/f86dde87-fef4-71eb-0480-62754aaca01b@imap.cc
Creating indexes on foreign tables is already forbidden, but local
partitioned indexes (commit 8b08f7d4820f) forgot to check for them. Add
a preliminary check to prevent wasting time.
Another school of thought says to allow the index to be created if it's
not a unique index; but it's possible to do better in the future (enable
indexing of foreign tables, somehow), so we avoid painting ourselves in
a corner by rejecting all cases, to avoid future grief (a.k.a. backward
incompatible changes).
Reported-by: Arseny Sher
Author: Amit Langote, Álvaro Herrera
Discussion: https://postgr.es/m/87sh71cakz.fsf@ars-thinkpad
Explain partition pruning more thoroughly, in a section above the one
that explains constraint exclusion, since the new feature is the one
that will be used more extensively from now on. Move some of the
material from the constraint exclusion subsection to the one on
partition pruning, so that we can explain the legacy method by
explaining the differences with the new one instead of repeating it.
Author: David Rowley, Álvaro Herrera
Reviewed-by: Amit Langote, David G. Johnston, Justin Pryzby
Discussion: https://postgr.es/m/CAKJS1f8PECxEi1YQ9nhVtshtfOMHUzAMm_Zp4gGCOCnMPjEKJA@mail.gmail.com
I get "WARNING: nested link may be undefined in output: <xref @linkend =
'pgbench'> nested inside parent element link" from this.
Also remove some trailing whitespace.
- Change vacuum_cleanup_index_scale_factor GUC to PGC_USERSET.
vacuum_cleanup_index_scale_factor GUC was defined as PGC_SIGHUP. But this
GUC affects not only autovacuum. So it might be useful to change it from user
session in order to influence manually runned VACUUM.
- Add missing tab-complete support for vacuum_cleanup_index_scale_factor
reloption.
- Fix condition for B-tree index cleanup.
Zero value of vacuum_cleanup_index_scale_factor means that user wants B-tree
index cleanup to be never skipped.
- Documentation and comment improvements
Authors: Justin Pryzby, Alexander Korotkov, Liudmila Mantrova
Reviewed by: all authors and Robert Haas
Discussion: https://www.postgresql.org/message-id/flat/20180502023025.GD7631%40telsasoft.com
DST law changes in North Korea. Redefinition of "daylight savings" in
Ireland, as well as for some past years in Namibia and Czechoslovakia.
Additional historical corrections for Czechoslovakia.
With this change, the IANA database models Irish timekeeping as following
"standard time" in summer, and "daylight savings" in winter, so that the
daylight savings offset is one hour behind standard time not one hour
ahead. This does not change their UTC offset (+1:00 in summer, 0:00 in
winter) nor their timezone abbreviations (IST in summer, GMT in winter),
though now "IST" is more correctly read as "Irish Standard Time" not "Irish
Summer Time". However, the "is_dst" column in the pg_timezone_names view
will now be true in winter and false in summer for the Europe/Dublin zone.
Similar changes were made for Namibia between 1994 and 2017, and for
Czechoslovakia between 1946 and 1947.
So far as I can find, no Postgres internal logic cares about which way
tm_isdst is reported; in particular, since commit b2cbced9e we do not
rely on it to decide how to interpret ambiguous timestamps during DST
transitions. So I don't think this change will affect any Postgres
behavior other than the timezone-view outputs.
Discussion: https://postgr.es/m/30996.1525445902@sss.pgh.pa.us
Commit 8b08f7d4820f failed to update these modules to at least give
non-broken error messages for partitioned indexes. Add appropriate
error support to them.
Peter G. was complaining about a problem of unfriendly error messages;
while we haven't fixed that yet, subsequent discussion let to discovery
of these unhandled cases.
Author: Michaël Paquier
Reported-by: Peter Geoghegan
Discussion: https://postgr.es/m/CAH2-WzkOKptQiE51Bh4_xeEHhaBwHkZkGtKizrFMgEkfUuRRQg@mail.gmail.com
Fix the lone error message in the whole source tree to use capitalized
HASH when referring to hash indexes, making it look like all the other
messages.
Someday it would be good to standardize 'B-Tree', 'B-tree', 'btree', and
random other spellings, too, but that's a larger patch ...
Author: Álvaro Herrera
match_clause_to_partition_key failed to consider COERCION_PATH_ARRAYCOERCE
cases in scalar-op-array expressions, so it was possible to crash the
server easily. To handle this case properly (ie. prune partitions) we
would need to run a bit of executor code during planning. Maybe it can
be improved, but for now let's just not crash. Add a test case that
used to trigger the crash.
Author: Michaël Paquier
match_clause_to_partition_key failed to indicate that operators that
don't have a commutator in a btree opclass are unsupported. It is
possible for this to cause a crash later if such an operator is used in
a scalar-op-array expression. Add a test case that used to the crash.
Author: Amit Langote
One caller of gen_partprune_steps_internal in
match_clause_to_partition_key was too optimistic about the former never
returning an empty step list. Rid it of its innocence. (Having fixed
the bug above, I no longer know how to exploit this, so no test case for
it, but it remained a bug.) Revise code flow a little bit, for
succintness.
Author: Álvaro Herrera
Reported-by: Marina Polyakova
Reviewed-by: Michaël Paquier
Reviewed-by: Amit Langote
Reviewed-by: Álvaro Herrera
Discussion: https://postgr.es/m/ff8f9bfa485ff961d6bb43e54120485b@postgrespro.ru
The vertical tightness settings collapse vertical whitespace between
opening and closing brackets (parentheses, square brakets and braces).
This can make data structures in particular harder to read, and is not
very consistent with our style in non-Perl code. This patch restricts
that setting to parentheses only, and reformats all the perl code
accordingly. Not applying this to parentheses has some unfortunate
effects, so the consensus is to keep the setting for parentheses and not
for the others.
The diff for this patch does highlight some places where structures
should have trailing commas. They can be added manually, as there is no
automatic tool to do so.
Discussion: https://postgr.es/m/a2f2b87c-56be-c070-bfc0-36288b4b41c1@2ndQuadrant.com
There's no need to export this function, so don't. Michaël didn't
actually write the patch, but we list him as first author because with a
trivial one like this, intellectual authorship is as important (if not
more) as bit shovelling.
Author: Michaël Paquier, Amit Langote
Discussion: https://postgr.es/m/c91299c4-199b-0f16-339b-a29d6d2a39ee@lab.ntt.co.jp
The regexes used in 102_vacuumdb_stages.pl to check the postmaster log
for expected output contained several places with ".*.*", which is
underdetermined and can cause exponential runtime growth in Perl's regex
matcher (since it's not bright enough not to waste time seeing whether
different splits of the same substring would allow a match). We were
fortunate that the amount of text in the postmaster log was generally not
enough to make the runtime go to the moon; although commit 6271fceb8 had
been on the hairy edge of an obvious problem, thanks to its increasing the
default log verbosity to DEBUG1. Experimentation shows that anyone who
tried to run this test case with an even higher log verbosity would have
been in for serious pain. But even at default logging level, fixing this
saves several hundred ms on my workstation, more on slower buildfarm
members.
Remove the extra ".*"s, restoring more-or-less-linear matching speed.
Back-patch to 9.4 where the test case was added, mostly in case anyone
tries to do related debugging in a back branch.
Discussion: https://postgr.es/m/32459.1525657786@sss.pgh.pa.us
While poking into initdb's performance, I noticed that this query
wasn't being done very intelligently. By forcing it to execute
obj_description() for each pg_proc/pg_operator join row, we were
essentially setting up a nestloop join to pg_description, which
is not a bright query plan when there are hundreds of outer rows.
Convert the check for a "deprecated" operator into a NOT EXISTS
so that it can be done as a hashed antijoin. On my workstation
this reduces the time for this query from ~ 35ms to ~ 10ms.
Which is not a huge win, but it adds up over buildfarm runs.
In passing, insert forced query breaks (\n\n, in single-user mode)
after each SQL-query file that initdb sources, and after some
relatively new queries in setup_privileges(). This doesn't make
a lot of difference normally, but it will result in briefer, saner
error messages if anything goes wrong.
Brown-paper-bag bug in commit 7c91a0364: when we rearranged the placement
of "reltuples += 1" statements, we missed including one in this code path.
The net effect of that was that CREATE INDEX CONCURRENTLY would set the
table's pg_class.reltuples to zero, as would index builds done during
bootstrap mode. (It seems like parallel index builds ought to fail
similarly, but they don't, perhaps because reltuples is computed in some
other way. You certainly couldn't figure that out from the abysmally
underdocumented parallelism code in this area.)
I was led to this by wondering why initdb seemed to have slowed down as
a result of 7c91a0364, as is evident in the buildfarm's timing history.
The reason is that every system catalog with indexes had pg_class.reltuples
= 0 after bootstrap, causing the planner to make some terrible choices for
queries in the post-bootstrap steps. On my workstation, this fix causes
the runtime of "initdb -N" to drop from ~2.0 sec to ~1.4 sec, which is
almost though not quite back to where it was in v10. That's not much of
a deal for production use perhaps, but it makes a noticeable difference
for buildfarm and "make check-world" runs, which do a lot of initdbs.
In Catalog.pm, mark eval of a string instead of a block as allowed.
Disallow perlcritic completely in Gen_dummy_probes.pl, as it's
generated code.
Protect a couple of lines in plperl code from perltidy, so that the
annotation for perlcritic stays on the same line as the construct it
would otherwise object to.
Commit 6271fceb8 changed PostgresNode.pm to force log_min_messages = debug1
in all TAP tests, without any discussion and without a concrete need for
it. This makes some of the TAP tests noticeably slower (although much of
that may be due to poorly-written regexes), and for certain it's bloating
the buildfarm logs. Revert the change.
Discussion: https://postgr.es/m/32459.1525657786@sss.pgh.pa.us
Commit 86f575948 already manually updated the oidjoins test for the
new pg_constraint.conparentid => pg_constraint.oid relationship, but
failed to update findoidjoins/README, thus the apparent inconsistency
here.
Michael Paquier
Discussion: https://postgr.es/m/20180507001811.GA27389@paquier.xyz
Most versions of "dtrace -h" drop const qualifiers from the declarations
of probe functions (though macOS gets it right). This causes compiler
warnings when we pass in pointers to const. Repair by extending our
existing post-processing of the probes.h file. To do so, assume that all
"char *" arguments should be "const char *"; that seems reasonably safe.
Thomas Munro
Discussion: https://postgr.es/m/CAEepm=2j1pWSruQJqJ91ZDzD8w9ZZDsM4j2C6x75C-VryWg-_w@mail.gmail.com
The set of functions that need parallel-safety adjustments isn't the
same in 9.6 as 10, so I shouldn't have blindly back-patched that list.
Adjust as needed. Also, provide examples of the commands to issue.
There shouldn't be a line break between two adjacent tags, because that
will appear as whitespace in the output. (The rendering engine might in
turn collapse that whitespace away, so it might not actually make a
difference, but it's more correct this way.)
In 9.6, we moved a number of functions over to using the GRANT system to
control access instead of having hard-coded superuser checks.
As it turns out, adminpack was creating another function in the catalog
for one of those backend functions where the superuser check was
removed, specifically pg_rotate_logfile(), but it didn't get the memo
about having to REVOKE EXECUTE on the alternative-name function
(pg_logfile_rotate()), meaning that in any installations with adminpack
on 9.6 and higher, any user is able to run the pg_logfile_rotate()
function, which then calls pg_rotate_logfile() and rotates the logfile.
Fix by adding a new version of adminpack (1.1) which handles the REVOKE.
As this function should have only been available to the superuser, this
is a security issue, albeit a minor one.
In HEAD, move the changes implemented for adminpack up to be adminpack
2.0 instead of 1.1.
Security: CVE-2018-1115
