== PostgreSQL Weekly News - October 08 2017 == PostgreSQL 10 released! https://www.postgresql.org/about/news/1786/
== PostgreSQL Product News == PL/Proxy 2.8, a database partitioning system implemented as PL language, released. https://plproxy.github.io pg_partman v3.1.0, a management system for partitioned tables, released. https://github.com/keithf4/pg_partman hypopg 1.1.0, an extension which implements hypothetical indexes, released. https://github.com/dalibo/hypopg dbForge Data Compare for PostgreSQL v3.0 released. https://www.devart.com/dbforge/postgresql/datacompare/whatsnew.html pgAdmin4 2.0, a web- and native GUI control center for PostgreSQL, released. https://www.pgadmin.org/ == PostgreSQL Jobs for October == http://archives.postgresql.org/pgsql-jobs/2017-10/ == PostgreSQL Local == PGDay.IT 2017 will take place October 13th, in Milan, Italy. http://pgday.it PostgreSQL Conference Europe 2017 will be held on October 24-27, 2017 in the Warsaw Marriott Hotel, in Warsaw, Poland. https://2017.pgconf.eu/ pgday.Seoul 2017 will be held in Seoul, South Korea on November 4, 2017. Korean language information is here: http://pgday.postgresql.kr/ 2ndQuadrant PostgreSQL Conference 2017 (2Q PGConf, for short) will be hosted on November 6th & 7th in New York City, and November 9th in Chicago. http://www.2qpgconf.com/ PGConf Local: Seattle will be held November 13 - 14, 2017. https://www.pgconf.us/#Seattle2017 PGDay Australia 2017 will be held on November 17 in Melbourne. http://2017.pgday.com.au/ PostgreSQL Session will take place November 17th, 2017, in Paris, France. http://www.postgresql-sessions.org/en/9/start PGConf Local: Austin will be held December 4 - 5, 2017. Call for Papers is now open at https://www.pgconf.us/conferences/Austin2017 PGConf.ASIA 2017 will take place on December 4-6 2017 in Akihabara, Tokyo, Japan. http://www.pgconf.asia/EN/2017/ PGConf India 2018 will be on February 22-23, 2018 in Bengaluru, Karnataka. Proposals are due via https://goo.gl/forms/F9hRjOIsaNasVOAz2 by October 31st, 2017. http://pgconf.in/ PostgreSQL@SCaLE is a two day, two track event which takes place on March 8-9, 2018, at Pasadena Convention Center, as part of SCaLE 16X. The CfP is open through October 31, 2017 at http://www.socallinuxexpo.org/scale/16x/cfp == PostgreSQL in the News == Planet PostgreSQL: http://planet.postgresql.org/ PostgreSQL Weekly News is brought to you this week by David Fetter Submit news and announcements by Sunday at 3:00pm EST5EDT. Please send English language ones to da...@fetter.org, German language to p...@pgug.de, Italian language to p...@itpug.org. == Applied Patches == Andres Freund pushed: - Try to make crash restart test work on windows. Author: Andres Freund Tested-By: Andrew Dunstan Discussion: https://postgr.es/m/20170930224424.ud5ilchmclbl5...@alap3.anarazel.de https://git.postgresql.org/pg/commitdiff/784905795f8aadc09efe2fdae195279d17250f00 - Remove redundant stdint.h include. Discussion: https://postgr.es/m/31674.1506788...@sss.pgh.pa.us https://git.postgresql.org/pg/commitdiff/1f2830f9df9f0196ba541c1e253463afe657cb67 - Allow pg_ctl kill to send SIGKILL. Previously that was disallowed out of an abundance of caution. Providing KILL support however is helpful to make the 013_crash_restart.pl test portable, and there's no actual issue with allowing it. SIGABRT, which has similar consequences except it also dumps core, was already allowed. Author: Andres Freund Discussion: https://postgr.es/m/45d42d41-6145-9be1-7261-84acf6d9e...@2ndquadrant.com https://git.postgresql.org/pg/commitdiff/2e83db3ad2da9b073af9ae12916f0b71cf698e1e - Replace most usages of ntoh[ls] and hton[sl] with pg_bswap.h. All postgres internal usages are replaced, it's just libpq example usages that haven't been converted. External users of libpq can't generally rely on including postgres internal headers. Note that this includes replacing open-coded byte swapping of 64bit integers (using two 32 bit swaps) with a single 64bit swap. Where it looked applicable, I have removed netinet/in.h and arpa/inet.h usage, which previously provided the relevant functionality. It's perfectly possible that I missed other reasons for including those, the buildfarm will tell. Author: Andres Freund Discussion: https://postgr.es/m/20170927172019.gheidqy6xvlxb...@alap3.anarazel.de https://git.postgresql.org/pg/commitdiff/0ba99c84e8c7138143059b281063d4cca5a2bfea - Correct include file name in inet_aton fallback. Per buildfarm animal frogmouth. Author: Andres Freund https://git.postgresql.org/pg/commitdiff/859759b62f2d2f2f2805e2aa9ebdb167a1b9655c - Yet another pg_bswap typo in a windows only file. Per buildfarm animal frogmouth. Brown-Paper-Bagged-By: Andres Freund https://git.postgresql.org/pg/commitdiff/0c8b3ee94478ca07c86c09d2399a2ce73c2b922b - Replace binary search in fmgr_isbuiltin with a lookup array. Turns out we have enough functions that the binary search is quite noticeable in profiles. Thus have Gen_fmgrtab.pl build a new mapping from a builtin function's oid to an index in the existing fmgr_builtins array. That keeps the additional memory usage at a reasonable amount. Author: Andres Freund, with input from Tom Lane Discussion: https://postgr.es/m/20170914065128.a5sk7z4xde5uy...@alap3.anarazel.de https://git.postgresql.org/pg/commitdiff/212e6f34d55c910505f87438d878698223d9a617 - Move genbki.pl's find_defined_symbol to Catalog.pm. Will be used in Gen_fmgrtab.pl in a followup commit. https://git.postgresql.org/pg/commitdiff/18f791ab2b6a01a632653d394e046f3daf193ff6 - Attempt to adapt windows build for 212e6f34d55c. Per buildfarm animal baiji. https://git.postgresql.org/pg/commitdiff/15334ad19a776f76cbb725e4e9162a7bce1bd4d0 - Msvc doesn't know UINT16_MAX, replace with PG_UINT16_MAX. UINT16_MAX usage is originating from commit 212e6f34d55c. Per buildfarm animal currawong. https://git.postgresql.org/pg/commitdiff/9eafa2b5b043b84fb9846bd7a57d15ed1ee220c1 Simon Riggs pushed: - Grammar typo in security warning about md5. https://git.postgresql.org/pg/commitdiff/0703c197adb0bf5fa6c99e8af74b13585bdc9056 Peter Eisentraut pushed: - Expand collation documentation. Document better how to create custom collations and what locale strings ICU accepts. Explain the ICU examples in more detail. Also update the text on the CREATE COLLATION reference page a bit to take ICU more into account. https://git.postgresql.org/pg/commitdiff/f41bd4cb90eb1d93631a346bf71d17dfc4beee50 - Document and use SPI_result_code_string(). A lot of semi-internal code just prints out numeric SPI error codes, which is not very helpful. We already have an API function to convert the codes to a string, so let's make more use of that. Reviewed-by: Michael Paquier <michael.paqu...@gmail.com> https://git.postgresql.org/pg/commitdiff/036166f26e00ab3286ef29a6519525d6291fdfd7 - Move SPI error reporting out of ri_ReportViolation(). These are two completely unrelated code paths, so it doesn't make sense to pack them into one function. Add attribute noreturn to ri_ReportViolation(). Reviewed-by: Michael Paquier <michael.paqu...@gmail.com> https://git.postgresql.org/pg/commitdiff/582bbcf37fb45ea2e6a851bf9a3c7d7364c7ad32 - Run coverage commands quietly. They are very chatty by default, but the output doesn't seem all that useful for normal operation. Reviewed-by: Michael Paquier <michael.paqu...@gmail.com> https://git.postgresql.org/pg/commitdiff/52e1b1b0425553250db35101f44090898322fb6f - Remove coverage details view. This is only useful if we name the different tests, which we don't do at the moment. Reviewed-by: Michael Paquier <michael.paqu...@gmail.com> https://git.postgresql.org/pg/commitdiff/c01123630db18561039d4eb17f9502bed0e9d109 - Support coverage on vpath builds. A few paths needed to be tweaked so everything looks into the appropriate directories. Reviewed-by: Michael Paquier <michael.paqu...@gmail.com> https://git.postgresql.org/pg/commitdiff/c3d9a66024a93e6d0380bdd1b18cb03a67216b72 Álvaro Herrera pushed: - Fix coding rules violations in walreceiver.c. 1. Since commit b1a9bad9e744 we had pstrdup() inside a spinlock-protected critical section; reported by Andreas Seltenreich. Turn those into strlcpy() to stack-allocated variables instead. Backpatch to 9.6. 2. Since commit 9ed551e0a4fd we had a pfree() uselessly inside a spinlock-protected critical section. Tom Lane noticed in code review. Move down. Backpatch to 9.6. 3. Since commit 64233902d22b we had GetCurrentTimestamp() (a kernel call) inside a spinlock-protected critical section. Tom Lane noticed in code review. Move it up. Backpatch to 9.2. 4. Since commit 1bb2558046cc we did elog(PANIC) while holding spinlock. Tom Lane noticed in code review. Release spinlock before dying. Backpatch to 9.2. Discussion: https://postgr.es/m/87h8vhtgj2....@ansel.ydns.eu https://git.postgresql.org/pg/commitdiff/89e434b59caffeeeb7478653c74ad5d7a50d2e96 - Fix traversal of half-frozen update chains. When some tuple versions in an update chain are frozen due to them being older than freeze_min_age, the xmax/xmin trail can become broken. This breaks HOT (and probably other things). A subsequent VACUUM can break things in more serious ways, such as leaving orphan heap-only tuples whose root HOT redirect items were removed. This can be seen because index creation (or REINDEX) complain like ERROR: XX000: failed to find parent tuple for heap-only tuple at (0,7) in table "t" Because of relfrozenxid contraints, we cannot avoid the freezing of the early tuples, so we must cope with the results: whenever we see an Xmin of FrozenTransactionId, consider it a match for whatever the previous Xmax value was. This problem seems to have appeared in 9.3 with multixact changes, though strictly speaking it seems unrelated. Since 9.4 we have commit 37484ad2a "Change the way we mark tuples as frozen", so the fix is simple: just compare the raw Xmin (still stored in the tuple header, since freezing merely set an infomask bit) to the Xmax. But in 9.3 we rewrite the Xmin value to FrozenTransactionId, so the original value is lost and we have nothing to compare the Xmax with. To cope with that case we need to compare the Xmin with FrozenXid, assume it's a match, and hope for the best. Sadly, since you can pg_upgrade a 9.3 instance containing half-frozen pages to newer releases, we need to keep the old check in newer versions too, which seems a bit brittle; I hope we can somehow get rid of that. I didn't optimize the new function for performance. The new coding is probably a bit slower than before, since there is a function call rather than a straight comparison, but I'd rather have it work correctly than be fast but wrong. This is a followup after 20b655224249 fixed a few related problems. Apparently, in 9.6 and up there are more ways to get into trouble, but in 9.3 - 9.5 I cannot reproduce a problem anymore with this patch, so there must be a separate bug. Reported-by: Peter Geoghegan Diagnosed-by: Peter Geoghegan, Michael Paquier, Daniel Wood, Yi Wen Wong, Álvaro Discussion: https://postgr.es/m/cah2-wznm4rcrhfaiwkpwtpew2bxdtgrozk7jwwgucxeh3d1...@mail.gmail.com https://git.postgresql.org/pg/commitdiff/a5736bf754c82d8b86674e199e232096c679201d Tom Lane pushed: - Fix race condition with unprotected use of a latch pointer variable. Commit 597a87ccc introduced a latch pointer variable to replace use of a long-lived shared latch in the shared WalRcvData structure. This was not well thought out, because there are now hazards of the pointer variable changing while it's being inspected by another process. This could obviously lead to a core dump in code like if (WalRcv->latch) SetLatch(WalRcv->latch); and there's a more remote risk of a torn read, if we have any platforms where reading/writing a pointer is not atomic. An actual problem would occur only if the walreceiver process exits (gracefully) while the startup process is trying to signal it, but that seems well within the realm of possibility. To fix, treat the pointer variable (not the referenced latch) as being protected by the WalRcv->mutex spinlock. There remains a race condition that we could apply SetLatch to a process latch that no longer belongs to the walreceiver, but I believe that's harmless: at worst it'd cause an extra wakeup of the next process to use that PGPROC structure. Back-patch to v10 where the faulty code was added. Discussion: https://postgr.es/m/22735.1507048...@sss.pgh.pa.us https://git.postgresql.org/pg/commitdiff/45f9d08684d954b0e514b69f270e763d2785dd53 - Allow multiple tables to be specified in one VACUUM or ANALYZE command. Not much to say about this; does what it says on the tin. However, formerly, if there was a column list then the ANALYZE action was implied; now it must be specified, or you get an error. This is because it would otherwise be a bit unclear what the user meant if some tables have column lists and some don't. Nathan Bossart, reviewed by Michael Paquier and Masahiko Sawada, with some editorialization by me Discussion: https://postgr.es/m/e061a8e3-5e3d-494d-94f0-e8a9b312b...@amazon.com https://git.postgresql.org/pg/commitdiff/11d8d72c27a64ea4e30adce11cf6c4f3dd3e60db - Adjust git_changelog for new-style release tags. It wasn't on board with REL_n_n format. https://git.postgresql.org/pg/commitdiff/4736d74479745f0f5a0129fba4628a742034b90e - Improve comments in vacuum_rel() and analyze_rel(). Remove obsolete references to get_rel_oids(). Avoid listing specific relkinds in the comments, since we seem unable to keep such things in sync with the code, and it's not all that helpful anyhow. Noted by Michael Paquier, though I rewrote the comments a bit more. Discussion: https://postgr.es/m/cab7npqtwin9zwktaorsnkigdchqrt7c1+ciidk4n4omn92r...@mail.gmail.com https://git.postgresql.org/pg/commitdiff/4d85c2900b113e331925baf308cc7fc75ac4530b - Fix typo in README. s/BeginInternalSubtransaction/BeginInternalSubTransaction/ https://git.postgresql.org/pg/commitdiff/fe9ba28ee852bb968bc8948d172c6bc0c70c50df - #ifdef out some dead code in psql/mainloop.c. This pg_send_history() call is unreachable, since the block it's in is currently only entered in !cur_cmd_interactive mode. But rather than just delete it, make it #ifdef NOT_USED, in hopes that we'll remember to enable it if we ever change that decision. Per report from David Binderman. Since this is basically cosmetic, I see no great need to back-patch. Discussion: https://postgr.es/m/he1pr0802mb233122b61f00a15e035c83be9c...@he1pr0802mb2331.eurprd08.prod.outlook.com https://git.postgresql.org/pg/commitdiff/3620569fecc6c2edb1cccfbba39b86c4e7d2faae - Fix access-off-end-of-array in clog.c. Sloppy loop coding in set_status_by_pages() resulted in fetching one array element more than it should from the subxids[] array. The odds of this resulting in SIGSEGV are pretty small, but we've certainly seen that happen with similar mistakes elsewhere. While at it, we can get rid of an extra TransactionIdToPage() calculation per loop. Per report from David Binderman. Back-patch to all supported branches, since this code is quite old. Discussion: https://postgr.es/m/he1pr0802mb2331cba919cbfff0c465eb429c...@he1pr0802mb2331.eurprd08.prod.outlook.com https://git.postgresql.org/pg/commitdiff/6b87416c9a4dd305b76e619ecac36e2b968462f8 - Fix intra-query memory leakage in nodeProjectSet.c. Both ExecMakeFunctionResultSet() and evaluation of simple expressions need to be done in the per-tuple memory context, not per-query, else we leak data until end of query. This is a consideration that was missed while refactoring code in the ProjectSet patch (note that in pre-v10, ExecMakeFunctionResult is called in the per-tuple context). Per bug #14843 from Ben M. Diagnosed independently by Andres and myself. Discussion: https://postgr.es/m/20171005230321.28561.15...@wrigleys.postgresql.org https://git.postgresql.org/pg/commitdiff/a1c2c430d33e0945da234b025b78bd265c8bdfb5 - Fix crash when logical decoding is invoked from a PL function. The logical decoding functions do BeginInternalSubTransaction and RollbackAndReleaseCurrentSubTransaction to clean up after themselves. It turns out that AtEOSubXact_SPI has an unrecognized assumption that we always need to cancel the active SPI operation in the SPI context that surrounds the subtransaction (if there is one). That's true when the RollbackAndReleaseCurrentSubTransaction call is coming from the SPI-using function itself, but not when it's happening inside some unrelated function invoked by a SPI query. In practice the affected callers are the various PLs. To fix, record the current subtransaction ID when we begin a SPI operation, and clean up only if that ID is the subtransaction being canceled. Also, remove AtEOSubXact_SPI's assertion that it must have cleaned up the surrounding SPI context's active tuptable. That's proven wrong by the same test case. Also clarify (or, if you prefer, reinterpret) the calling conventions for _SPI_begin_call and _SPI_end_call. The memory context cleanup in the latter means that these have always had the flavor of a matched resource-management pair, but they weren't documented that way before. Per report from Ben Chobot. Back-patch to 9.4 where logical decoding came in. In principle, the SPI changes should go all the way back, since the problem dates back to commit 7ec1c5a86. But given the lack of field complaints it seems few people are using internal subtransactions in this way. So I don't feel a need to take any risks in 9.2/9.3. Discussion: https://postgr.es/m/73fba179-c68c-4540-9473-71e865408...@silentmedia.com https://git.postgresql.org/pg/commitdiff/1518d07842dcb412ea6b8bb8172c40da7499b174 - Clean up sloppy maintenance of regression test schedule files. The partition_join test was added to a parallel group that was already at the maximum of 20 concurrent tests. The hash_func test wasn't added to serial_schedule at all. The identity and partition_join tests were added to serial_schedule with the aid of a dartboard, rather than maintaining consistency with parallel_schedule. There are proposals afoot to make these sorts of errors harder to make, but in the meantime let's fix the ones already in place. Discussion: https://postgr.es/m/a37e9c57-22d4-1b82-1270-4501cd2e9...@2ndquadrant.com https://git.postgresql.org/pg/commitdiff/1fdab4d5aa47d8a2bb29ccb1122b0158f6db221f - Enforce our convention about max number of parallel regression tests. We have a very old rule that parallel_schedule should have no more than twenty tests in any one parallel group, so as to provide a bound on the number of concurrently running processes needed to pass the tests. But people keep forgetting the rule, so let's add a few lines of code to check it. Discussion: https://postgr.es/m/a37e9c57-22d4-1b82-1270-4501cd2e9...@2ndquadrant.com https://git.postgresql.org/pg/commitdiff/ef73a8162a5fe9c4b2f895bf9fb660f1aabc796c - Improve pg_regress's error reporting for schedule-file problems. The previous coding here trashed the line buffer as it scanned it, making it impossible to print the source line in subsequent error messages. With a few save/restore/strdup pushups we can improve that situation. In passing, move the free'ing of the various strings that are collected while processing one set of tests down to the bottom of the loop. That's simpler, less surprising, and should make valgrind less unhappy about the strings that were previously leaked by the last iteration. https://git.postgresql.org/pg/commitdiff/b11f0d36b224a9673863b4e592f40f179dba3016 - Reduce "X = X" to "X IS NOT NULL", if it's easy to do so. If the operator is a strict btree equality operator, and X isn't volatile, then the clause must yield true for any non-null value of X, or null if X is null. At top level of a WHERE clause, we can ignore the distinction between false and null results, so it's valid to simplify the clause to "X IS NOT NULL". This is a useful improvement mainly because we'll get a far better selectivity estimate in most cases. Because such cases seldom arise in well-written queries, it is unappetizing to expend a lot of planner cycles looking for them ... but it turns out that there's a place we can shoehorn this in practically for free, because equivclass.c already has to detect and reject candidate equivalences of the form X = X. That doesn't catch every place that it would be valid to simplify to X IS NOT NULL, but it catches the typical case. Working harder doesn't seem justified. Patch by me, reviewed by Petr Jelinek Discussion: https://postgr.es/m/camjna7cc4x9yr-vajs-jsycajhrdvjqnn7m2slh1wlh-_z2...@mail.gmail.com https://git.postgresql.org/pg/commitdiff/8ec5429e2f422f4d570d4909507db0d4ca83bbac - Increase distance between flush requests during bulk file copies. copy_file() reads and writes data 64KB at a time (with default BLCKSZ), and historically has issued a pg_flush_data request after each write. This turns out to interact really badly with macOS's new APFS file system: a large file copy takes over 100X longer than it ought to on APFS, as reported by Brent Dearth. While that's arguably a macOS bug, it's not clear whether Apple will do anything about it in the near future, and in any case experimentation suggests that issuing flushes a bit less often can be helpful on other platforms too. Hence, rearrange the logic in copy_file() so that flush requests are issued once per N writes rather than every time through the loop. I set the FLUSH_DISTANCE to 32MB on macOS (any less than that still results in a noticeable speed degradation on APFS), but 1MB elsewhere. In limited testing on Linux and FreeBSD, this seems slightly faster than the previous code, and certainly no worse. It helps noticeably on macOS even with the older HFS filesystem. A simpler change would have been to just increase the size of the copy buffer without changing the loop logic, but that seems likely to trash the processor cache without really helping much. Back-patch to 9.6 where we introduced msync() as an implementation option for pg_flush_data(). The problem seems specific to APFS's mmap/msync support, so I don't think we need to go further back. Discussion: https://postgr.es/m/CADkxhTNv-j2jw2g8H57deMeAbfRgYBoLmVuXkC=ycfbxruc...@mail.gmail.com https://git.postgresql.org/pg/commitdiff/643c27e36ff38f40d256c2a05b51a14ae2b26077 Robert Haas pushed: - Fix more user-visible elog() calls. Michael Paquier discovered that this could be triggered via SQL; give a nicer message instead. Patch by Michael Paquier, reviewed by Masahiko Sawada. Discussion: http://postgr.es/m/cab7npqqtpg+lkktzdkn26judhcvpz0s1gnigzot4j8cyuuu...@mail.gmail.com https://git.postgresql.org/pg/commitdiff/c097b271e8a14eac5e6189139deca66796b16a59 - Fix typo. Etsuro Fujita Discussion: http://postgr.es/m/1b2e9ac7-b99a-2769-5e42-afdf62bfa...@lab.ntt.co.jp https://git.postgresql.org/pg/commitdiff/4b2ba1fe0222b7820a2f4cd52b133baeb91c5a93 - Allow DML commands that create tables to use parallel query. Haribabu Kommi, reviewed by Dilip Kumar and Rafia Sabih. Various cosmetic changes by me to explain why this appears to be safe but allowing inserts in parallel mode in general wouldn't be. Also, I removed the REFRESH MATERIALIZED VIEW case from Haribabu's patch, since I'm not convinced that case is OK, and hacked on the documentation somewhat. Discussion: http://postgr.es/m/cajrrpgdo5bak6qnpwe8kpi8g_jfqes-g4symg9y+ofaw2-d...@mail.gmail.com https://git.postgresql.org/pg/commitdiff/e9baa5e9fa147e00a2466ab2c40eb99c8a700824 - Improve error message when skipping scan of default partition. It seems like a good idea to clearly distinguish between skipping the scan of the new partition itself and skipping the scan of the default partition. Amit Langote Discussion: http://postgr.es/m/1f08b844-0078-aa8d-452e-7af3bf77d...@lab.ntt.co.jp https://git.postgresql.org/pg/commitdiff/c31e9d4bafd80da52408af5f87fe874c9ca0c952 - On attach, consider skipping validation of subpartitions individually. If the table attached as a partition is itself partitioned, individual partitions might have constraints strong enough to skip scanning the table even if the table actually attached does not. This is pretty cheap to check, and possibly a big win if it works out. Amit Langote, with test case changes by me. Discussion: http://postgr.es/m/1f08b844-0078-aa8d-452e-7af3bf77d...@lab.ntt.co.jp https://git.postgresql.org/pg/commitdiff/14f67a8ee282ebc0de78e773fbd597f460ab4a54 - On CREATE TABLE, consider skipping validation of subpartitions. This is just like commit 14f67a8ee282ebc0de78e773fbd597f460ab4a54, but for CREATE PARTITION rather than ATTACH PARTITION. Jeevan Ladhe, with test case changes by me. Discussion: http://postgr.es/m/CAOgcT0MWwG8WBw8frFMtRYHAgDD=tpt6u7wcso_l2k0kypm...@mail.gmail.com https://git.postgresql.org/pg/commitdiff/6476b26115f3ef25a9cd87880e0ac5ec5f7a05f6 - Basic partition-wise join functionality. Instead of joining two partitioned tables in their entirety we can, if it is an equi-join on the partition keys, join the matching partitions individually. This involves teaching the planner about "other join" rels, which are related to regular join rels in the same way that other member rels are related to baserels. This can use significantly more CPU time and memory than regular join planning, because there may now be a set of "other" rels not only for every base relation but also for every join relation. In most practical cases, this probably shouldn't be a problem, because (1) it's probably unusual to join many tables each with many partitions using the partition keys for all joins and (2) if you do that scenario then you probably have a big enough machine to handle the increased memory cost of planning and (3) the resulting plan is highly likely to be better, so what you spend in planning you'll make up on the execution side. All the same, for now, turn this feature off by default. Currently, we can only perform joins between two tables whose partitioning schemes are absolutely identical. It would be nice to cope with other scenarios, such as extra partitions on one side or the other with no match on the other side, but that will have to wait for a future patch. Ashutosh Bapat, reviewed and tested by Rajkumar Raghuwanshi, Amit Langote, Rafia Sabih, Thomas Munro, Dilip Kumar, Antonin Houska, Amit Khandekar, and by me. A few final adjustments by me. Discussion: http://postgr.es/m/CAFjFpRfQ8GrQvzp3jA2wnLqrHmaXna-urjm_UY9BqXj=ead...@mail.gmail.com Discussion: http://postgr.es/m/cafjfprcitjfrulr5jfukwrpsgux0lq0k8-yg0qw2+1lbgnp...@mail.gmail.com https://git.postgresql.org/pg/commitdiff/f49842d1ee31b976c681322f76025d7732e860f3 - Copy information from the relcache instead of pointing to it. We have the relations continuously locked, but not open, so relcache pointers are not guaranteed to be stable. Per buildfarm member prion. Ashutosh Bapat. I fixed a typo. Discussion: http://postgr.es/m/CAFjFpRcRBqoKLZSNmRsjKr81uEP=ennvqsqaxvccbtxvj2r...@mail.gmail.com https://git.postgresql.org/pg/commitdiff/45866c75507f0757de0da6e90c694a0dbe67d727 == Pending Patches == Tom Lane sent in another revision of a patch to improve eval const expressions. Michaël Paquier sent in another revision of a patch to change detection of corrupted 2PC files to produce a FATAL error and minimize the window between history file and end-of-recovery record. Claudio Freire sent in another revision of a patch to enable VACUUM to use over 1GB of work_mem. Emre Hasegeli sent in another revision of a patch to improve geometric types. Robert Haas sent in four revisions of a patch to widen queryId to 64 bits. Vik Fearing sent in a patch to log idle checkpoints. Andres Freund sent in a patch to combine expr{Type,Typmod,Collation}() into one function. Andres Freund sent in a patch to add pg_strnlen(), a portable implementation of strlen and fix pnstrdup() to not memcpy() the maximum allowed. Ildar Musin sent in another revision of a patch to factor out some repetitive code in RI triggers. Yura Sokolov sent in two revisions of a patch to make CheckDeadlock do two passes in order to prevent a deadlock condition it could itself cause under high load. Andres Freund sent in another revision of a patch to add configure infrastructure to detect support for C99's restrict, allow to avoid NUL-byte management for stringinfos and use in format.c, add more efficient functions to the pqformat API, use one stringbuffer for all rows printed in printtup.c, improve the performance of SendRowDescriptionMessage, and replace remaining printtup uses of pq_sendint with pq_sendintXX. Alexander Korotkov sent in a patch to add TOAST to all system catalog tables with ACL. Nico Williams sent in three revisions of a patch to add an ALWAYS DEFERRED option for constraints. Amit Kapila sent in two more revisions of a patch to parallelize queries containing subplans. Petr Jelínek sent in a patch to fix an issue in logical replication by setting assigning GetCurrentCommandId in logical replication's estate. Alexander Kuzmenkov sent in another revision of a patch to enable a full merge join on comparison clause. Amit Khandekar sent in another revision of a patch to enable UPDATEs on partition keys in declaratively partitioned tables that would have the effect of moving tuples from one partition to another. Nathan Bossart sent in a patch to add additional logging for VACUUM and ANALYZE. Sean Chittenden sent in two more revisions of a patch to fix a bug where the system failed to use optimized shared memory on Solaris. Andres Freund sent in another revision of a patch to implement JIT compiling. Badrul Chowdhury sent in two revisions of a patch to implement wire protocol negotiation. Vaishnavi Prabakaran sent in another revision of a patch to add pipelining batch support to libpq. Masahiko Sawada sent in another revision of a patch to implement block-level parallel VACUUM. Thomas Munro sent in another revision of a patch to remove BufFile's isTemp flag and add BufFileSet for sharing temporary files between backends. Robert Haas sent in another revision of a patch to change walwriter wakeup. Shubham Barai sent in another revision of a patch to add predicate locking for GiST indexes. Fabrízio de Royes Mello sent in another revision of a patch to add hooks for session start and end. Amit Langote sent in a patch to improve error message for check_default_allows_bound. Peter Geoghegan sent in another revision of a patch to add a Bloom filter data structure implementation and use same to add amcheck verification of indexes against heap. Craig Ringer sent in a patch to expose the generate_qualified_relation_name functionality to C by adding get_qualified_relation_name(). Jing Wang sent in another revision of a patch to support to COMMENT ON DATABASE CURRENT_DATABASE. Dilip Kumar sent in two more revisions of a patch to improve bitmap costing for lossy pages. Tom Lane sent in a patch to enforce max test parallelism. -- Sent via pgsql-announce mailing list (pgsql-announce@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-announce
