Commit Graph

48962 Commits

Author SHA1 Message Date
Tom Lane c9b0c678d3 Fix default text search parser's ts_headline code for phrase queries.
This code could produce very poor results when asked to highlight a
string based on a query using phrase-match operators.  The root cause
is that hlCover(), which is supposed to find a minimal substring that
matches the query, was written assuming that word position is not
significant.  I'm only 95% convinced that its algorithm was correct even
for plain AND/OR queries; but it definitely fails completely for phrase
matches, causing it to possibly not identify a cover string at all.

Hence, rewrite hlCover() with a less-tense algorithm that just tries
all the possible substrings, earlier and shorter ones first.  (This is
not as bad as it sounds performance-wise, because all of the string
matching has been done already: the repeated tsquery match checks
boil down to pointer comparisons.)

Unfortunately, since that approach produces more candidate cover
strings than before, it also exposes that there were bugs in the
heuristics in mark_hl_words() for selecting a best cover string.
Fixes there include:
* Do not apply the ShortWord filter to words that appear in the query.
* Remove a misguided optimization for quickly rejecting a cover.
* Fix order-of-operation bug that could cause computation of a
wrong figure of merit (poslen) when shortening a cover.
* Change the preference rule so that candidate headlines that do not
include their whole cover string (after MaxWords trimming) are lowest
priority, since they may not actually satisfy the user's query.

This results in some changes in existing regression test cases,
but they all seem reasonable.  Note in particular that the tests
involving strings like "1 2 3" were previously being affected by
the ShortWord filter, masking the normal matching behavior.

Per bug #16345 from Augustinas Jokubauskas; the new test cases are
based on that example.  Back-patch to 9.6 where phrase search was
added to tsquery.

Discussion: https://postgr.es/m/16345-2e0cf5cddbdcd3b4@postgresql.org
2020-04-09 13:19:23 -04:00
Tom Lane b10f8bb9fd Cosmetic improvements for default text search parser's ts_headline code.
This code was woefully unreadable and under-commented.  Try to improve
matters by adding comments, using some macros to make complicated
if-tests more readable, using boolean type where appropriate, etc.
There are a couple of tiny coding improvements too, but this commit
includes (I hope) no behavioral change.

Nonetheless, back-patch as far as 9.6, because a followup bug-fixing
commit depends on this.

Discussion: https://postgr.es/m/16345-2e0cf5cddbdcd3b4@postgresql.org
2020-04-09 12:36:59 -04:00
Peter Eisentraut e92e4a2b68 Fix CREATE TABLE LIKE INCLUDING GENERATED column order issue
CREATE TABLE LIKE INCLUDING GENERATED would fail if a generated column
referred to a column with a higher attribute number.  This is because
the column mapping mechanism created the mapping incrementally as
columns are added.  This was sufficient for previous uses of that
mechanism (omitting dropped columns), and it also happened to work if
generated columns only referred to columns with lower attribute
numbers, but here it failed.

This fix is to build the attribute mapping in a separate loop before
processing the columns in detail.

Bug: #16342
Reported-by: Ethan Waldo <ewaldo@healthetechs.com>
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
2020-04-09 16:36:45 +02:00
Fujii Masao c4f82a779d Fix typo in pg_validatebackup documentation.
Author: Fujii Masao
Reviewed-by: Robert Haas
Discussion: https://postgr.es/m/78f76a3d-1a28-a97d-0394-5c96985dd1c0@oss.nttdata.com
2020-04-09 22:38:24 +09:00
Fujii Masao 1ec50a81ec Exclude backup_manifest file that existed in database, from BASE_BACKUP.
If there is already a backup_manifest file in the database cluster,
it belongs to the past backup that was used to start this server.
It is not correct for the backup being taken now. So this commit
changes pg_basebackup so that it always skips such backup_manifest
file. The backup_manifest file for the current backup will be injected
separately if users want it.

Author: Fujii Masao
Reviewed-by: Robert Haas
Discussion: https://postgr.es/m/78f76a3d-1a28-a97d-0394-5c96985dd1c0@oss.nttdata.com
2020-04-09 22:37:11 +09:00
Amit Kapila 5c71362174 Allow parallel create index to accumulate buffer usage stats.
Currently, we don't account for buffer usage incurred by parallel workers
for parallel create index.  This commit allows each worker to record the
buffer usage stats and leader backend to accumulate that stats at the
end of the operation.  This will allow pg_stat_statements to display
correct buffer usage stats for (parallel) create index command.

Reported-by: Julien Rouhaud
Author: Sawada Masahiko
Reviewed-by: Dilip Kumar, Julien Rouhaud and Amit Kapila
Backpatch-through: 11, where this was introduced
Discussion: https://postgr.es/m/20200328151721.GB12854@nol
2020-04-09 09:49:30 +05:30
Fujii Masao 58ad961f19 Add note in pg_stat_statements documentation about planning statistics.
The added note explains that the numbers of planning and execution in
the statement are not always expected to match because their statistics are
updated at their respective end phase, and only for successful operations.

Author: Pascal Legrand, Julien Rouhaud, tweaked a bit by Fujii Masao
Discussion: https://postgr.es/m/1585857868967-0.post@n3.nabble.com
2020-04-09 12:56:36 +09:00
Andrew Dunstan c3e4cbaab9 Msys2 tweaks for pg_validatebackup corruption test
1. Tell Msys2 not to mangle the tablespace map parameter
2. If rmdir doesn't work, fall back to trying unlink on the entry in
   pg_tblspc.

Discussion: https://postgr.es/m/7330a7c7-ce5f-9769-39a1-bdb0b32bb4a6@2ndQuadrant.com
2020-04-08 17:50:55 -04:00
Peter Eisentraut f45b8e51b6 createuser: Change a fprintf to pg_log_error 2020-04-08 19:26:09 +02:00
Tomas Vondra cea09246e5 Stabilize incremental_sort tests
The test never did ANALYZE on the test table, so the plans depended on
various defaults (e.g. number of groups being 200). This worked most of
the time, but with CLOBBER_CACHE_ALWAYS the autoanalyze often managed
to build accurate stats, changing the  plan.

Fixed by increasing the size of test tables a bit, making the Sort a bit
more expensive than Incremental Sort. The tests were constructed to test
transitions in the Incremental Sort algorithm, and this change does not
break that.

Reviewed-by: James Coleman
Discussion: https://postgr.es/m/CAPpHfds1waRZ=NOmueYq0sx1ZSCnt+5QJvizT8ndT2=etZEeAQ@mail.gmail.com
2020-04-08 18:30:11 +02:00
Tom Lane a9d70c1087 Fix pg_dump/pg_restore to restore event trigger comments later.
Repair an oversight in commit 8728b2c70: if we're postponing restore
of event triggers to the end, we must also postpone restoring any
comments on them, since of course we cannot create the comments first.
(This opens yet another opportunity for an event trigger to bollix
the restore, but there's no help for that.)

Per bug #16346 from Alexander Lakhin.

Like the previous commit, back-patch to all supported branches.

Hamid Akhtar and Tom Lane

Discussion: https://postgr.es/m/16346-6210ad7a0ea81be1@postgresql.org
2020-04-08 11:23:39 -04:00
Thomas Munro d140f2f3e2 Rationalize GetWalRcv{Write,Flush}RecPtr().
GetWalRcvWriteRecPtr() previously reported the latest *flushed*
location.  Adopt the conventional terminology used elsewhere in the tree
by renaming it to GetWalRcvFlushRecPtr(), and likewise for some related
variables that used the term "received".

Add a new definition of GetWalRcvWriteRecPtr(), which returns the latest
*written* value.  This will allow later patches to use the value for
non-data-integrity purposes, without having to wait for the flush
pointer to advance.

Reviewed-by: Alvaro Herrera <alvherre@2ndquadrant.com>
Reviewed-by: Andres Freund <andres@anarazel.de>
Discussion: https://postgr.es/m/CA%2BhUKGJ4VJN8ttxScUFM8dOKX0BrBiboo5uz1cq%3DAovOddfHpA%40mail.gmail.com
2020-04-08 23:45:09 +12:00
Peter Eisentraut 83fd4532a7 Allow publishing partition changes via ancestors
To control whether partition changes are replicated using their own
identity and schema or an ancestor's, add a new parameter that can be
set per publication named 'publish_via_partition_root'.

This allows replicating a partitioned table into a different partition
structure on the subscriber.

Author: Amit Langote <amitlangote09@gmail.com>
Reviewed-by: Rafia Sabih <rafia.pghackers@gmail.com>
Reviewed-by: Peter Eisentraut <peter.eisentraut@2ndquadrant.com>
Reviewed-by: Petr Jelinek <petr@2ndquadrant.com>
Discussion: https://www.postgresql.org/message-id/flat/CA+HiwqH=Y85vRK3mOdjEkqFK+E=ST=eQiHdpj43L=_eJMOOznQ@mail.gmail.com
2020-04-08 11:19:23 +02:00
Alexander Korotkov 1aac32df89 Revert 0f5ca02f53
0f5ca02f53 introduces 3 new keywords.  It appears to be too much for relatively
small feature.  Given now we past feature freeze, it's already late for
discussion of the new syntax.  So, revert.

Discussion: https://postgr.es/m/28209.1586294824%40sss.pgh.pa.us
2020-04-08 11:37:27 +03:00
David Rowley 02a2e8b442 Modify additional power 2 calculations to use new helper functions
2nd pass of modifying various places which obtain the next power
of 2 of a number and make them use the new functions added in
f0705bb62.

In passing, also modify num_combinations(). This can be implemented
using simple bitshifting rather than looping.

Reviewed-by: John Naylor
Discussion: https://postgr.es/m/20200114173553.GE32763%40fetter.org
2020-04-08 18:29:51 +12:00
Michael Paquier c0187869a0 Fix crash when using COLLATE in partition bound expressions
Attempting to use a COLLATE clause with a type that it not collatable in
a partition bound expression could crash the server.  This commit fixes
the code by adding more checks similar to what is done when computing
index or partition attributes by making sure that there is a collation
iff the type is collatable.

Backpatch down to 12, as 7c079d7 introduced this problem.

Reported-by: Alexander Lakhin
Author: Dmitry Dolgov
Discussion: https://postgr.es/m/16325-809194cf742313ab@postgresql.org
Backpatch-through: 12
2020-04-08 15:04:51 +09:00
David Rowley d025cf88ba Modify various power 2 calculations to use new helper functions
First pass of modifying various places that obtain the next power of 2 of
a number and make them use the new functions added in pg_bitutils.h
instead.

This also removes the _hash_log2() function. There are no longer any
callers in core. Other users can swap their _hash_log2(n) call to make use
of pg_ceil_log2_32(n).

Author: David Fetter, with some minor adjustments by me
Reviewed-by: John Naylor, Jesse Zhang
Discussion: https://postgr.es/m/20200114173553.GE32763%40fetter.org
2020-04-08 16:55:03 +12:00
Jeff Davis 50a38f6517 Create memory context for HashAgg with a reasonable maxBlockSize.
If the memory context's maxBlockSize is too big, a single block
allocation can suddenly exceed work_mem. For Hash Aggregation, this
can mean spilling to disk too early or reporting a confusing memory
usage number for EXPLAN ANALYZE.

Introduce CreateWorkExprContext(), which is like CreateExprContext(),
except that it creates the AllocSet with a maxBlockSize that is
reasonable in proportion to work_mem.

Right now, CreateWorkExprContext() is only used by Hash Aggregation,
but it may be generally useful in the future.

Discussion: https://postgr.es/m/412a3fbf306f84d8d78c4009e11791867e62b87c.camel@j-davis.com
2020-04-07 21:25:28 -07:00
David Rowley f0705bb628 Add functions to calculate the next power of 2
There are many areas in the code where we need to determine the next
highest power of 2 of a given number.  We tend to always do that in an
ad-hoc way each time, generally with some tight for loop which performs a
bitshift left once per loop and goes until it finds a number above the
given number.

Here we add two generic functions which make use of the existing
pg_leftmost_one_pos* functions which, when available, will allow us to
calculate the next power of 2 without any looping.

Here we don't add any code which uses these new functions. That will be
done in follow-up commits.

Author: David Fetter, with some minor adjustments by me
Reviewed-by: John Naylor, Jesse Zhang
Discussion: https://postgr.es/m/20200114173553.GE32763%40fetter.org
2020-04-08 16:22:52 +12:00
Tom Lane 7a5d74b7dd Put back mistakenly removed #include.
In commit 4dbcb3f84 I removed some code from parse_coerce.c, and also
removed some apparently-no-longer-needed #includes.  But removing
datum.h broke some not-compiled-by-default code.

Discussion: https://postgr.es/m/20200407205436.pyjhddw5bn5upvsu@development
2020-04-08 00:10:16 -04:00
Alvaro Herrera 9e9abed746
Remove testing for precise LSN/reserved bytes in new TAP test
Trying to ensure that a slot's restart_lsn or amount of reserved bytes
exactly match some specific values seems unnecessary, and fragile as
shown by failures in multiple buildfarm members.

Discussion: https://postgr.es/m/20200407232602.GA21559@alvherre.pgsql
2020-04-07 23:28:27 -04:00
Thomas Munro 3985b600f5 Support PrefetchBuffer() in recovery.
Provide PrefetchSharedBuffer(), a variant that takes SMgrRelation, for
use in recovery.  Rename LocalPrefetchBuffer() to PrefetchLocalBuffer()
for consistency.

Add a return value to all of these.  In recovery, tolerate and report
missing files, so we can handle relations unlinked before crash recovery
began.  Also report cache hits and misses, so that callers can do faster
buffer lookups and better I/O accounting.

Reviewed-by: Alvaro Herrera <alvherre@2ndquadrant.com>
Reviewed-by: Andres Freund <andres@anarazel.de>
Discussion: https://postgr.es/m/CA%2BhUKGJ4VJN8ttxScUFM8dOKX0BrBiboo5uz1cq%3DAovOddfHpA%40mail.gmail.com
2020-04-08 14:56:57 +12:00
Tom Lane 981643dcdb Allow partitionwise join to handle nested FULL JOIN USING cases.
This case didn't work because columns merged by FULL JOIN USING are
represented in the parse tree by COALESCE expressions, and the logic
for recognizing a partitionable join failed to match upper-level join
clauses to such expressions.  To fix, synthesize suitable COALESCE
expressions and add them to the nullable_partexprs lists.  This is
pretty ugly and brute-force, but it gets the job done.  (I have
ambitions of rethinking the way outer-join output Vars are
represented, so maybe that will provide a cleaner solution someday.
For now, do this.)

Amit Langote, reviewed by Justin Pryzby, Richard Guo, and myself

Discussion: https://postgr.es/m/CA+HiwqG2WVUGmLJqtR0tPFhniO=H=9qQ+Z3L_ZC+Y3-EVQHFGg@mail.gmail.com
2020-04-07 22:12:14 -04:00
Etsuro Fujita c8434d64ce Allow partitionwise joins in more cases.
Previously, the partitionwise join technique only allowed partitionwise
join when input partitioned tables had exactly the same partition
bounds.  This commit extends the technique to some cases when the tables
have different partition bounds, by using an advanced partition-matching
algorithm introduced by this commit.  For both the input partitioned
tables, the algorithm checks whether every partition of one input
partitioned table only matches one partition of the other input
partitioned table at most, and vice versa.  In such a case the join
between the tables can be broken down into joins between the matching
partitions, so the algorithm produces the pairs of the matching
partitions, plus the partition bounds for the join relation, to allow
partitionwise join for computing the join.  Currently, the algorithm
works for list-partitioned and range-partitioned tables, but not
hash-partitioned tables.  See comments in partition_bounds_merge().

Ashutosh Bapat and Etsuro Fujita, most of regression tests by Rajkumar
Raghuwanshi, some of the tests by Mark Dilger and Amul Sul, reviewed by
Dmitry Dolgov and Amul Sul, with additional review at various points by
Ashutosh Bapat, Mark Dilger, Robert Haas, Antonin Houska, Amit Langote,
Justin Pryzby, and Tomas Vondra

Discussion: https://postgr.es/m/CAFjFpRdjQvaUEV5DJX3TW6pU5eq54NCkadtxHX2JiJG_GvbrCA@mail.gmail.com
2020-04-08 10:25:00 +09:00
Tom Lane 41a194f491 Fix circle_in to accept "(x,y),r" as it's advertised to do.
Our documentation describes four allowed input syntaxes for circles,
but the regression tests tried only three ... with predictable
consequences.  Remarkably, this has been wrong since the circle
datatype was added in 1997, but nobody noticed till now.

David Zhang, with some help from me

Discussion: https://postgr.es/m/332c47fa-d951-7574-b5cc-a8f7f7201202@highgo.ca
2020-04-07 20:50:28 -04:00
Andres Freund 75848bc744 snapshot scalability: Move delayChkpt from PGXACT to PGPROC.
The goal of separating hotly accessed per-backend data from PGPROC
into PGXACT is to make accesses fast (GetSnapshotData() in
particular). But delayChkpt is not actually accessed frequently; only
when starting a checkpoint. As it is frequently modified (multiple
times in the course of a single transaction), storing it in the same
cacheline as hotly accessed data unnecessarily dirties a contended
cacheline.

Therefore move delayChkpt to PGPROC.

This is part of a larger series of patches intending to improve
GetSnapshotData() scalability. It is committed and pushed separately,
as it is independently beneficial (small but measurable win, limited
by the other frequent modifications of PGXACT).

Author: Andres Freund
Reviewed-By: Robert Haas, Thomas Munro, David Rowley
Discussion: https://postgr.es/m/20200301083601.ews6hz5dduc3w2se@alap3.anarazel.de
2020-04-07 17:36:23 -07:00
Tomas Vondra 2b88fdde30 Track SLRU page hits in SimpleLruReadPage_ReadOnly
SLRU page hits were tracked only in SimpleLruReadPage, but that's not
enough because we may hit the page in SimpleLruReadPage_ReadOnly in
which case we don't call SimpleLruReadPage at all.

Reported-by: Kuntal Ghosh
Discussion: https://postgr.es/m/20200119143707.gyinppnigokesjok@development
2020-04-08 02:15:47 +02:00
Andres Freund 91c40548d5 Fix XLogReader FD leak that makes backends unusable after 2PC usage.
Before the fix every 2PC commit/abort leaked a file descriptor. As the
files are opened using BasicOpenFile(), that quickly leads to the
backend running out of file descriptors.

Once enough 2PC abort/commit have caused enough FDs to leak, any IO
in the backend will fail with "Too many open files", as
BasicOpenFilePerm() will have triggered all open files known to fd.c
to be closed.

The leak causing the problem at hand is a consequence of 0dc8ead46,
but is only exascerbated by it. Previously most XLogPageReadCB
callbacks used static variables to cache one open file, but after the
commit the cache is private to each XLogReader instance. There never
was infrastructure to close FDs at the time of XLogReaderFree, but the
way XLogReader was used limited the leak to one FD.

This commit just closes the during XLogReaderFree() if the FD is
stored in XLogReaderState.seg.ws_segno. This may not be the way to
solve this medium/long term, but at least unbreaks 2PC.

Discussion: https://postgr.es/m/20200406025651.fpzdb5yyb7qyhqko@alap3.anarazel.de
2020-04-07 17:03:04 -07:00
Alvaro Herrera 7e2ffb3885
Appease perlcritic
Food for the gods must always be found somehow, even when the land starves.
2020-04-07 19:09:55 -04:00
Peter Geoghegan 60cbd7751c Remove nbtree BTreeTupleSetAltHeapTID() function.
Since heap TID is supposed to be just another key attribute to the
implementation, it doesn't make much sense to have separate
BTreeTupleSetNAtts() and BTreeTupleSetAltHeapTID() functions.  Merge the
two functions together.  This slightly simplifies _bt_truncate().
2020-04-07 15:56:52 -07:00
Alvaro Herrera c655077639
Allow users to limit storage reserved by replication slots
Replication slots are useful to retain data that may be needed by a
replication system.  But experience has shown that allowing them to
retain excessive data can lead to the primary failing because of running
out of space.  This new feature allows the user to configure a maximum
amount of space to be reserved using the new option
max_slot_wal_keep_size.  Slots that overrun that space are invalidated
at checkpoint time, enabling the storage to be released.

Author: Kyotaro HORIGUCHI <horiguchi.kyotaro@lab.ntt.co.jp>
Reviewed-by: Masahiko Sawada <sawada.mshk@gmail.com>
Reviewed-by: Jehan-Guillaume de Rorthais <jgdr@dalibo.com>
Reviewed-by: Álvaro Herrera <alvherre@alvh.no-ip.org>
Discussion: https://postgr.es/m/20170228.122736.123383594.horiguchi.kyotaro@lab.ntt.co.jp
2020-04-07 18:35:00 -04:00
Tom Lane b63c293bcb Allow psql's \g and \gx commands to transiently change \pset options.
We invented \gx to allow the "\pset expanded" flag to be forced on
for the duration of one command output, but that turns out to not
be nearly enough to satisfy the demand for variant output formats.
Hence, make it possible to change any pset option(s) for the duration
of a single command output, by writing "option=value ..." inside
parentheses, for example
	\g (format=csv csv_fieldsep='\t') somefile

\gx can now be understood as a shorthand for including expanded=on
inside the parentheses.

Patch by me, expanding on a proposal by Pavel Stehule

Discussion: https://postgr.es/m/CAFj8pRBx9OnBPRJVtfA5ycUpySge-XootAXAsv_4rrkHxJ8eRg@mail.gmail.com
2020-04-07 17:46:29 -04:00
Alexander Korotkov 0f5ca02f53 Implement waiting for given lsn at transaction start
This commit adds following optional clause to BEGIN and START TRANSACTION
commands.

  WAIT FOR LSN lsn [ TIMEOUT timeout ]

New clause pospones transaction start till given lsn is applied on standby.
This clause allows user be sure, that changes previously made on primary would
be visible on standby.

New shared memory struct is used to track awaited lsn per backend.  Recovery
process wakes up backend once required lsn is applied.

Author: Ivan Kartyshov, Anna Akenteva
Reviewed-by: Craig Ringer, Thomas Munro, Robert Haas, Kyotaro Horiguchi
Reviewed-by: Masahiko Sawada, Ants Aasma, Dmitry Ivanov, Simon Riggs
Reviewed-by: Amit Kapila, Alexander Korotkov
Discussion: https://postgr.es/m/0240c26c-9f84-30ea-fca9-93ab2df5f305%40postgrespro.ru
2020-04-07 23:51:10 +03:00
Alvaro Herrera 357889eb17
Support FETCH FIRST WITH TIES
WITH TIES is an option to the FETCH FIRST N ROWS clause (the SQL
standard's spelling of LIMIT), where you additionally get rows that
compare equal to the last of those N rows by the columns in the
mandatory ORDER BY clause.

There was a proposal by Andrew Gierth to implement this functionality in
a more powerful way that would yield more features, but the other patch
had not been finished at this time, so we decided to use this one for
now in the spirit of incremental development.

Author: Surafel Temesgen <surafel3000@gmail.com>
Reviewed-by: Álvaro Herrera <alvherre@alvh.no-ip.org>
Reviewed-by: Tomas Vondra <tomas.vondra@2ndquadrant.com>
Discussion: https://postgr.es/m/CALAY4q9ky7rD_A4vf=FVQvCGngm3LOes-ky0J6euMrg=_Se+ag@mail.gmail.com
Discussion: https://postgr.es/m/87o8wvz253.fsf@news-spur.riddles.org.uk
2020-04-07 16:22:13 -04:00
Tom Lane 26a944cf29 Adjust bytea get_bit/set_bit to use int8 not int4 for bit numbering.
Since the existing bit number argument can't exceed INT32_MAX, it's
not possible for these functions to manipulate bits beyond the first
256MB of a bytea value.  Lift that restriction by redeclaring the
bit number arguments as int8 (which requires a catversion bump,
hence is not back-patchable).

The similarly-named functions for bit/varbit don't really have a
problem because we restrict those types to at most VARBITMAXLEN bits;
hence leave them alone.

While here, extend the encode/decode functions in utils/adt/encode.c
to allow dealing with values wider than 1GB.  This is not a live bug
or restriction in current usage, because no input could be more than
1GB, and since none of the encoders can expand a string more than 4X,
the result size couldn't overflow uint32.  But it might be desirable
to support more in future, so make the input length values size_t
and the potential-output-length values uint64.

Also add some test cases to improve the miserable code coverage
of these functions.

Movead Li, editorialized some by me; also reviewed by Ashutosh Bapat

Discussion: https://postgr.es/m/20200312115135445367128@highgo.ca
2020-04-07 15:57:58 -04:00
Tomas Vondra 9c74ceb20b Remove debugging elog from pgstat_recv_resetslrucounter
Reported-by: Thomas Munro
2020-04-07 19:20:20 +02:00
Tomas Vondra d22782a539 Minor improvements in Incremental Sort explain
Some places still used "Maximum" instead of "Peak" when displaying info
about sort space, so fix that. Also, add a comment clarifying why it's
correct to check the number of full/prefix sort groups.

Author: James Coleman
Discussion: https://postgr.es/m/CAPpHfds1waRZ=NOmueYq0sx1ZSCnt+5QJvizT8ndT2=etZEeAQ@mail.gmail.com
2020-04-07 18:25:13 +02:00
Fujii Masao 4bd0ad9e44 Prevent archive recovery from scanning non-existent WAL files.
Previously when there were multiple timelines listed in the history file
of the recovery target timeline, archive recovery searched all of them,
starting from the newest timeline to the oldest one, to find the segment
to read. That is, archive recovery had to continuously fail scanning
the segment until it reached the timeline that the segment belonged to.
These scans for non-existent segment could be harmful on the recovery
performance especially when archival area was located on the remote
storage and each scan could take a long time.

To address the issue, this commit changes archive recovery so that
it skips scanning the timeline that the segment to read doesn't belong to.

Author: Kyotaro Horiguchi, tweaked a bit by Fujii Masao
Reviewed-by: David Steele, Pavel Suderevsky, Grigory Smolkin
Discussion: https://postgr.es/m/16159-f5a34a3a04dc67e0@postgresql.org
Discussion: https://postgr.es/m/20200129.120222.1476610231001551715.horikyota.ntt@gmail.com
2020-04-08 00:49:29 +09:00
Tomas Vondra ba3e76cc57 Consider Incremental Sort paths at additional places
Commit d2d8a229bc introduced Incremental Sort, but it was considered
only in create_ordered_paths() as an alternative to regular Sort. There
are many other places that require sorted input and might benefit from
considering Incremental Sort too.

This patch modifies a number of those places, but not all. The concern
is that just adding Incremental Sort to any place that already adds
Sort may increase the number of paths considered, negatively affecting
planning time, without any benefit. So we've taken a more conservative
approach, based on analysis of which places do affect a set of queries
that did seem practical. This means some less common queries may not
benefit from Incremental Sort yet.

Author: Tomas Vondra
Reviewed-by: James Coleman
Discussion: https://postgr.es/m/CAPpHfds1waRZ=NOmueYq0sx1ZSCnt+5QJvizT8ndT2=etZEeAQ@mail.gmail.com
2020-04-07 16:43:22 +02:00
Tom Lane c7654f6a37 Fix representation of SORT_TYPE_STILL_IN_PROGRESS.
It turns out that the code did indeed rely on a zeroed
TuplesortInstrumentation.sortMethod field to indicate
"this worker never did anything", although it seems the
issue only comes up during certain race-condition-y cases.

Hence, rearrange the TuplesortMethod enum to restore
SORT_TYPE_STILL_IN_PROGRESS to having the value zero,
and add some comments reinforcing that that isn't optional.

Also future-proof a loop over the possible values of the enum.
sizeof(bits32) happened to be the correct limit value,
but only by purest coincidence.

Per buildfarm and local investigation.

Discussion: https://postgr.es/m/12222.1586223974@sss.pgh.pa.us
2020-04-06 22:22:13 -04:00
Thomas Munro 4c04be9b05 Introduce xid8-based functions to replace txid_XXX.
The txid_XXX family of fmgr functions exposes 64 bit transaction IDs to
users as int8.  Now that we have an SQL type xid8 for FullTransactionId,
define a new set of functions including pg_current_xact_id() and
pg_current_snapshot() based on that.  Keep the old functions around too,
for now.

It's a bit sneaky to use the same C functions for both, but since the
binary representation is identical except for the signedness of the
type, and since older functions are the ones using the wrong signedness,
and since we'll presumably drop the older ones after a reasonable period
of time, it seems reasonable to switch to FullTransactionId internally
and share the code for both.

Reviewed-by: Fujii Masao <masao.fujii@oss.nttdata.com>
Reviewed-by: Takao Fujii <btfujiitkp@oss.nttdata.com>
Reviewed-by: Yoshikazu Imai <imai.yoshikazu@fujitsu.com>
Reviewed-by: Mark Dilger <mark.dilger@enterprisedb.com>
Discussion: https://postgr.es/m/20190725000636.666m5mad25wfbrri%40alap3.anarazel.de
2020-04-07 12:04:32 +12:00
Thomas Munro aeec457de8 Add SQL type xid8 to expose FullTransactionId to users.
Similar to xid, but 64 bits wide.  This new type is suitable for use in
various system views and administration functions.

Reviewed-by: Fujii Masao <masao.fujii@oss.nttdata.com>
Reviewed-by: Takao Fujii <btfujiitkp@oss.nttdata.com>
Reviewed-by: Yoshikazu Imai <imai.yoshikazu@fujitsu.com>
Reviewed-by: Mark Dilger <mark.dilger@enterprisedb.com>
Discussion: https://postgr.es/m/20190725000636.666m5mad25wfbrri%40alap3.anarazel.de
2020-04-07 12:03:59 +12:00
Tomas Vondra 4bea576b03 Use INT64_FORMAT when formatting int64 values in explain
Per report from lapwing.
2020-04-07 01:16:57 +02:00
Tomas Vondra 23ba3b5ee2 Fix failures in incremental_sort due to number of workers
The last test in incremental_sort suite prints a parallel plan, but some
of the buildfarm animals have custom max_parallel_workers_per_gather
values, causing failures. Fixed by setting the GUC to an explicit value.

Discussion: https://postgr.es/m/CAPpHfds1waRZ=NOmueYq0sx1ZSCnt+5QJvizT8ndT2=etZEeAQ@mail.gmail.com
2020-04-07 00:02:07 +02:00
Peter Geoghegan ce2cee0ade Fix nbtree kill_prior_tuple posting list assert.
An assertion added by commit 0d861bbb checked that _bt_killitems() only
processes a BTScanPosItem whose heap TID is contained in a posting list
tuple when its page offset number still matches what is on the page
(i.e. when it matches the posting list tuple's current offset number).
This was only correct in the common case where the page can't have
changed since we first read it.  It was not correct in cases where we
don't drop the buffer pin (and don't need to verify the page hasn't
changed using its LSN).  The latter category includes scans involving
unlogged tables, and scans that use a non-MVCC snapshot, per the logic
originally introduced by commit 2ed5b87f.

The assertion still seems helpful.  Fix it by taking cases where the
page may have been concurrently modified into account.

Reported-By: Anastasia Lubennikova, Alexander Lakhin
Discussion: https://postgr.es/m/c4e38e9a-0f9c-8e53-e639-adf343f94472@postgrespro.ru
2020-04-06 14:46:33 -07:00
Tomas Vondra 7d6d82a524 Fix show_incremental_sort_info with force_parallel_mode
When executed with force_parallel_mode=regress, the function was exiting
too early and thus failed to print the worker stats. Fixed by making it
more like show_sort_info.

Discussion: https://postgr.es/m/CAPpHfds1waRZ=NOmueYq0sx1ZSCnt+5QJvizT8ndT2=etZEeAQ@mail.gmail.com
2020-04-06 23:19:13 +02:00
Tomas Vondra d2d8a229bc Implement Incremental Sort
Incremental Sort is an optimized variant of multikey sort for cases when
the input is already sorted by a prefix of the requested sort keys. For
example when the relation is already sorted by (key1, key2) and we need
to sort it by (key1, key2, key3) we can simply split the input rows into
groups having equal values in (key1, key2), and only sort/compare the
remaining column key3.

This has a number of benefits:

- Reduced memory consumption, because only a single group (determined by
  values in the sorted prefix) needs to be kept in memory. This may also
  eliminate the need to spill to disk.

- Lower startup cost, because Incremental Sort produce results after each
  prefix group, which is beneficial for plans where startup cost matters
  (like for example queries with LIMIT clause).

We consider both Sort and Incremental Sort, and decide based on costing.

The implemented algorithm operates in two different modes:

- Fetching a minimum number of tuples without check of equality on the
  prefix keys, and sorting on all columns when safe.

- Fetching all tuples for a single prefix group and then sorting by
  comparing only the remaining (non-prefix) keys.

We always start in the first mode, and employ a heuristic to switch into
the second mode if we believe it's beneficial - the goal is to minimize
the number of unnecessary comparions while keeping memory consumption
below work_mem.

This is a very old patch series. The idea was originally proposed by
Alexander Korotkov back in 2013, and then revived in 2017. In 2018 the
patch was taken over by James Coleman, who wrote and rewrote most of the
current code.

There were many reviewers/contributors since 2013 - I've done my best to
pick the most active ones, and listed them in this commit message.

Author: James Coleman, Alexander Korotkov
Reviewed-by: Tomas Vondra, Andreas Karlsson, Marti Raudsepp, Peter Geoghegan, Robert Haas, Thomas Munro, Antonin Houska, Andres Freund, Alexander Kuzmenkov
Discussion: https://postgr.es/m/CAPpHfdscOX5an71nHd8WSUH6GNOCf=V7wgDaTXdDd9=goN-gfA@mail.gmail.com
Discussion: https://postgr.es/m/CAPpHfds1waRZ=NOmueYq0sx1ZSCnt+5QJvizT8ndT2=etZEeAQ@mail.gmail.com
2020-04-06 21:35:10 +02:00
Tom Lane 3c8553547b Re-stabilize infinite_recurse() test case.
Since commit 8f59f6b9c0, CLOBBER_CACHE_ALWAYS buildfarm members have
been failing this test case because the error message now sometimes
includes an error cursor position.  It seems largely just luck that
that never happened before, and there are likely to be more ways it
could happen in future.  Hence, rather than trying to prevent it,
adjust the test script to suppress that component of the report.

At some point we might need to back-patch this, but refrain until
there's a demonstrated need.  (We'd need a different fix before v12,
anyway, since VERBOSITY=sqlstate is a recent thing.)

Tom Lane and Andres Freund

Discussion: https://postgr.es/m/30675.1586111599@sss.pgh.pa.us
2020-04-06 12:00:37 -04:00
Peter Eisentraut f1ac27bfda Add logical replication support to replicate into partitioned tables
Mainly, this adds support code in logical/worker.c for applying
replicated operations whose target is a partitioned table to its
relevant partitions.

Author: Amit Langote <amitlangote09@gmail.com>
Reviewed-by: Rafia Sabih <rafia.pghackers@gmail.com>
Reviewed-by: Peter Eisentraut <peter.eisentraut@2ndquadrant.com>
Reviewed-by: Petr Jelinek <petr@2ndquadrant.com>
Discussion: https://www.postgresql.org/message-id/flat/CA+HiwqH=Y85vRK3mOdjEkqFK+E=ST=eQiHdpj43L=_eJMOOznQ@mail.gmail.com
2020-04-06 15:15:52 +02:00
Amit Kapila b7ce6de93b Allow autovacuum to log WAL usage statistics.
This commit allows autovacuum to log WAL usage statistics added by commit
df3b181499.

Author: Julien Rouhaud
Reviewed-by: Dilip Kumar and Amit Kapila
Discussion: https://postgr.es/m/CAB-hujrP8ZfUkvL5OYETipQwA=e3n7oqHFU=4ZLxWS_Cza3kQQ@mail.gmail.com
2020-04-06 16:24:51 +05:30