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2020-11-26Use Enums for logical replication message types at more places.Amit Kapila
Commit 644f0d7cc9 added logical replication message type enums to use instead of character literals but some char substitutions were overlooked. Author: Peter Smith Reviewed-by: Amit Kapila Discussion: https://postgr.es/m/CAHut+PsTG=Vrv8hgrvOnAvCNR21jhqMdPk2n0a1uJPoW0p+UfQ@mail.gmail.com
2020-11-25Avoid spurious waits in concurrent indexingAlvaro Herrera
In the various waiting phases of CREATE INDEX CONCURRENTLY (CIC) and REINDEX CONCURRENTLY (RC), we wait for other processes to release their snapshots; this is necessary in general for correctness. However, processes doing CIC in other tables cannot possibly affect CIC or RC done in "this" table, so we don't need to wait for those. This commit adds a flag in MyProc->statusFlags to indicate that the current process is doing CIC, so that other processes doing CIC or RC can ignore it when waiting. Note that this logic is only valid if the index does not access other tables. For simplicity we avoid setting the flag if the index has a column that's an expression, or has a WHERE predicate. (It is possible to have expressional or partial indexes that do not access other tables, but figuring that out would require more work.) This flag can potentially also be used by processes doing REINDEX CONCURRENTLY to be skipped; and by VACUUM to ignore processes in CIC or RC for the purposes of computing an Xmin. That's left for future commits. Author: Álvaro Herrera <alvherre@alvh.no-ip.org> Author: Dimitry Dolgov <9erthalion6@gmail.com> Reviewed-by: Michael Paquier <michael@paquier.xyz> Discussion: https://postgr.es/m/20200810233815.GA18970@alvherre.pgsql
2020-11-25In psql's \d commands, don't truncate attribute default values.Tom Lane
Historically, psql has truncated the text of a column's default expression at 128 characters. This is unlike any other behavior in describe.c, and it's become particularly confusing now that the limit is only applied to the expression proper and not to the "generated always as (...) stored" text that may get wrapped around it. Excavation in our git history suggests that the original motivation for this limit was not really to limit the display width (as I'd long supposed), but to make it safe to use a fixed-width output buffer to store the result. That implementation restriction is long gone of course, but the limit remained. Let's just get rid of it. While here, rearrange the logic about when to free the output string so that it's not so dependent on unstated assumptions about the possible values of attidentity and attgenerated. Per bug #16743 from David Turon. Back-patch to v12 where GENERATED came in. (Arguably we could take it back further, but I'm hesitant to change the behavior of long-stable branches for this.) Discussion: https://postgr.es/m/16743-7b1bacc4af76e7ad@postgresql.org
2020-11-25Avoid spamming the client with multiple ParameterStatus messages.Tom Lane
Up to now, we sent a ParameterStatus message to the client immediately upon any change in the active value of any GUC_REPORT variable. This was only barely okay when the feature was designed; now that we have things like function SET clauses, there are very plausible use-cases where a GUC_REPORT variable might change many times within a query --- and even end up back at its original value, perhaps. Fortunately most of our GUC_REPORT variables are unlikely to be changed often; but there are proposals in play to enlarge that set, or even make it user-configurable. Hence, let's fix things to not generate more than one ParameterStatus message per variable per query, and to not send any message at all unless the end-of-query value is different from what we last reported. Discussion: https://postgr.es/m/5708.1601145259@sss.pgh.pa.us
2020-11-25Make error hint from bind() failure more accuratePeter Eisentraut
The hint "Is another postmaster already running ..." should only be printed for errors that are really about something else already using the address. In other cases it is misleading. So only show that hint if errno == EADDRINUSE. Also, since Unix-domain sockets in the file-system namespace never report EADDRINUSE for an existing file (they would just overwrite it), the part of the hint saying "If not, remove socket file \"%s\" and retry." can never happen, so remove it. Unix-domain sockets in the abstract namespace can report EADDRINUSE, but in that case there is no file to remove, so the hint doesn't work there either. Reviewed-by: Michael Paquier <michael@paquier.xyz> Discussion: https://www.postgresql.org/message-id/flat/6dee8574-b0ad-fc49-9c8c-2edc796f0033@2ndquadrant.com
2020-11-25Add support for abstract Unix-domain socketsPeter Eisentraut
This is a variant of the normal Unix-domain sockets that don't use the file system but a separate "abstract" namespace. At the user interface, such sockets are represented by names starting with "@". Supported on Linux and Windows right now. Reviewed-by: Michael Paquier <michael@paquier.xyz> Discussion: https://www.postgresql.org/message-id/flat/6dee8574-b0ad-fc49-9c8c-2edc796f0033@2ndquadrant.com
2020-11-25Fix WaitLatch(NULL) on Windows.Thomas Munro
Further to commit 733fa9aa, on Windows when a latch is triggered but we aren't currently waiting for it, we need to locate the latch's HANDLE rather than calling ResetEvent(NULL). Author: Kyotaro Horiguchi <horikyota.ntt@gmail.com> Reported-by: Ranier Vilela <ranier.vf@gmail.com> Discussion: https://postgr.es/m/CAEudQArTPi1YBc%2Bn1fo0Asy3QBFhVjp_QgyKG-8yksVn%2ByRTiw%40mail.gmail.com
2020-11-25Remove obsolete comment atop ri_PlanCheck.Amit Kapila
Commit 5b7ba75f7f removed the unused parameter but forgot to update the nearby comments. Author: Li Japin Backpatch-through: 13, where it was introduced Discussion: https://postgr.es/m/0E2F62A2-B2F1-4052-83AE-F0BEC8A75789@hotmail.com
2020-11-25Stop gap fix for __attribute__((cold)) compiler bug in MinGW 8.1David Rowley
The buildfarm animal walleye, running MinGW 8.1 has been having problems ever since 697e1d02f and 913ec71d6 went in. This appears to be a bug in assembler which was fixed in a later version. For now, in order to get that animal running green again, let's just define pg_attribute_cold and pg_attribute_hot to be empty macros on that compiler. Hopefully, we can get the support of the owner of the animal to upgrade to a less buggy compiler and revert this at a later date. Discussion: https://postgr.es/m/286560.1606233316@sss.pgh.pa.us
2020-11-25Remove catalog function currtid()Michael Paquier
currtid() and currtid2() are an undocumented set of functions whose sole known user is the Postgres ODBC driver, able to retrieve the latest TID version for a tuple given by the caller of those functions. As used by Postgres ODBC, currtid() is a shortcut able to retrieve the last TID loaded into a backend by passing an OID of 0 (magic value) after a tuple insertion. This is removed in this commit, as it became obsolete after the driver began using "RETURNING ctid" with inserts, a clause supported since Postgres 8.2 (using RETURNING is better for performance anyway as it reduces the number of round-trips to the backend). currtid2() is still used by the driver, so this remains around for now. Note that this function is kept in its original shape for backward compatibility reasons. Per discussion with many people, including Andres Freund, Peter Eisentraut, Álvaro Herrera, Hiroshi Inoue, Tom Lane and myself. Bump catalog version. Discussion: https://postgr.es/m/20200603021448.GB89559@paquier.xyz
2020-11-24Properly check index mark/restore in ExecSupportsMarkRestore.Andrew Gierth
Previously this code assumed that all IndexScan nodes supported mark/restore, which is not true since it depends on optional index AM support functions. This could lead to errors about missing support functions in rare edge cases of mergejoins with no sort keys, where an unordered non-btree index scan was placed on the inner path without a protecting Materialize node. (Normally, the fact that merge join requires ordered input would avoid this error.) Backpatch all the way since this bug is ancient. Per report from Eugen Konkov on irc. Discussion: https://postgr.es/m/87o8jn50be.fsf@news-spur.riddles.org.uk
2020-11-25Tidy up definitions of pg_attribute_hot and pg_attribute_coldDavid Rowley
1fa22a43a was a quick fix for portability problem I introduced in 697e1d02f. 1fa22a43a adds a few more cases to the preprocessor logic than I'd have liked. Andres Freund and Dagfinn Ilmari Mannsåker suggested a better way to do this. In passing, also adjust the only current usage of these macros so that the macro comes before the function's return type in the declaration of the function. This now matches what the definition of the function does. Discussion: https://postgr.es/m/20200625163553.lt6wocbjhklp5pl4@alap3.anarazel.de Discussion: https://postgr.es/m/87pn43bmok.fsf@wibble.ilmari.org
2020-11-24Put "inline" marker on declarations of inline functions.Tom Lane
I'm having a hard time telling whether the letter of the C standard requires this, but we do have a couple of buildfarm members that throw warnings when this is not done. Oversight in c532d15dd.
2020-11-24Move per-agg and per-trans duplicate finding to the planner.Heikki Linnakangas
This has the advantage that the cost estimates for aggregates can count the number of calls to transition and final functions correctly. Bump catalog version, because views can contain Aggrefs. Reviewed-by: Andres Freund Discussion: https://www.postgresql.org/message-id/b2e3536b-1dbc-8303-c97e-89cb0b4a9a48%40iki.fi
2020-11-24Use macros instead of hardcoded offsets for LWLock initializationMichael Paquier
This makes the code slightly easier to follow, as the initialization relies on an offset that overlapped with an equivalent set of macros defined, which are used in other places already. Author: Japin Li Discussion: https://postgr.es/m/MEYP282MB1669FB410006758402F2C3A2B6E00@MEYP282MB1669.AUSP282.PROD.OUTLOOK.COM
2020-11-23Centralize logic for skipping useless ereport/elog calls.Tom Lane
While ereport() and elog() themselves are quite cheap when the error message level is too low to be printed, some places need to do substantial work before they can call those macros at all. To allow optimizing away such setup work when nothing is to be printed, make elog.c export a new function message_level_is_interesting(elevel) that reports whether ereport/elog will do anything. Make use of that in various places that had ad-hoc direct tests of log_min_messages etc. Also teach ProcSleep to use it to avoid some work. (There may well be other places that could usefully use this; I didn't search hard.) Within elog.c, refactor a little bit to avoid having duplicate copies of the policy-setting logic. When that code was written, we weren't relying on the availability of inline functions; so it had some duplications in the name of efficiency, which I got rid of. Alvaro Herrera and Tom Lane Discussion: https://postgr.es/m/129515.1606166429@sss.pgh.pa.us
2020-11-24Fix unportable usage of __has_attributeDavid Rowley
This should fix the breakages caused by 697e1d02f, which seems to break the build for GCC version < 5. It seems, according to the GCC manual that __has_attribute is a "special operator" and must be tested without any other conditions in the preprocessor test. Per recommendation from the GCC manual via Greg Nancarrow Reported-by: Greg Nancarrow Discussion: https://postgr.es/m/CAJcOf-euSu8fhC10v476o9dqnjqKysVs1_vRms-_fvajpZ3kFw@mail.gmail.com
2020-11-24Improve compiler code layout in elog/ereport ERROR callsDavid Rowley
Here we use a bit of preprocessor trickery to coax supporting compilers into laying out their generated code so that the code that's in the same branch as elog(ERROR)/ereport(ERROR) calls is moved away from the hot path. Effectively, this reduces the size of the hot code meaning that it can sit on fewer cache lines. Performance improvements of between 10-15% have been seen on highly CPU bound workloads using pgbench's TPC-b benchmark. What's achieved here is very similar to putting the error condition inside an unlikely() macro. For example; if (unlikely(x < 0)) elog(ERROR, "invalid x value"); now there's no need to make use of unlikely() here as the common macro used by elog and ereport will now see that elevel is >= ERROR and make use of a pg_attribute_cold marked version of errstart(). When elevel < ERROR or if it cannot be determined to be constant, the original behavior is maintained. Author: David Rowley Reviewed-by: Andres Freund, Peter Eisentraut Discussion: https://postgr.es/m/CAApHDvrVpasrEzLL2er7p9iwZFZ%3DJj6WisePcFeunwfrV0js_A%40mail.gmail.com
2020-11-24Define pg_attribute_cold and pg_attribute_hot macrosDavid Rowley
For compilers supporting __has_attribute and __has_attribute (hot/cold). __has_attribute is supported on gcc >= 5, clang >= 2.9 and icc >= 17. A followup commit will implement some usages of these macros. Author: David Rowley Reviewed-by: Andres Freund, Peter Eisentraut Discussion: https://postgr.es/m/CAApHDvrVpasrEzLL2er7p9iwZFZ%3DJj6WisePcFeunwfrV0js_A%40mail.gmail.com
2020-11-23Remove unnecessary #include.Tom Lane
Justin Pryzby Discussion: https://postgr.es/m/20201123205505.GJ24052@telsasoft.com
2020-11-23Don't hold ProcArrayLock longer than needed in rare casesAlvaro Herrera
While cancelling an autovacuum worker, we hold ProcArrayLock while formatting a debugging log string. We can make this shorter by saving the data we need to produce the message and doing the formatting outside the locked region. This isn't terribly critical, as it only occurs pretty rarely: when a backend runs deadlock detection and it happens to be blocked by a autovacuum running autovacuum. Still, there's no need to cause a hiccup in ProcArrayLock processing, which can be very high-traffic in some cases. While at it, rework code so that we only print the string when it is really going to be used, as suggested by Michael Paquier. Discussion: https://postgr.es/m/20201118214127.GA3179@alvherre.pgsql Reviewed-by: Michael Paquier <michael@paquier.xyz>
2020-11-23Rename the "point is strictly above/below point" comparison operators.Tom Lane
Historically these were called >^ and <^, but that is inconsistent with the similar box, polygon, and circle operators, which are named |>> and <<| respectively. Worse, the >^ and <^ names are used for *not* strict above/below tests for the box type. Hence, invent new operators following the more common naming. The old operators remain available for now, and are still accepted by the relevant index opclasses too. But there's a deprecation notice, so maybe we can get rid of them someday. Emre Hasegeli, reviewed by Pavel Borisov Discussion: https://postgr.es/m/24348.1587444160@sss.pgh.pa.us
2020-11-23Improve wording of two error messages related to generated columns.Tom Lane
Clarify that you can "insert" into a generated column as long as what you're inserting is a DEFAULT placeholder. Also, use ERRCODE_GENERATED_ALWAYS in place of ERRCODE_SYNTAX_ERROR; there doesn't seem to be any reason to use the less specific errcode. Discussion: https://postgr.es/m/9q0sgcr416t.fsf@gmx.us
2020-11-23Make some sanity-check elogs more verboseAlvaro Herrera
A few sanity checks in funcapi.c were not mentioning all the possible clauses for failure, confusing developers who fat-fingered catalog data additions. Make the errors more detailed to avoid wasting time in pinpointing mistakes. Per complaint from Craig Ringer. Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/CAMsr+YH7Kd87A3cU5m_wKo46HPQ46zFv5wesFNL0YWxkGhGv3g@mail.gmail.com
2020-11-23Fix a few comments that referred to copy.c.Heikki Linnakangas
Missed these in the previous commit.
2020-11-23Split copy.c into four files.Heikki Linnakangas
Copy.c has grown really large. Split it into more manageable parts: - copy.c now contains only a few functions that are common to COPY FROM and COPY TO. - copyto.c contains code for COPY TO. - copyfrom.c contains code for initializing COPY FROM, and inserting the tuples to the correct table. - copyfromparse.c contains code for reading from the client/file/program, and parsing the input text/CSV/binary format into tuples. All of these parts are fairly complicated, and fairly independent of each other. There is a patch being discussed to implement parallel COPY FROM, which will add a lot of new code to the COPY FROM path, and another patch which would allow INSERTs to use the same multi-insert machinery as COPY FROM, both of which will require refactoring that code. With those two patches, there's going to be a lot of code churn in copy.c anyway, so now seems like a good time to do this refactoring. The CopyStateData struct is also split. All the formatting options, like FORMAT, QUOTE, ESCAPE, are put in a new CopyFormatOption struct, which is used by both COPY FROM and TO. Other state data are kept in separate CopyFromStateData and CopyToStateData structs. Reviewed-by: Soumyadeep Chakraborty, Erik Rijkers, Vignesh C, Andres Freund Discussion: https://www.postgresql.org/message-id/8e15b560-f387-7acc-ac90-763986617bfb%40iki.fi
2020-11-22Allow a multi-row INSERT to specify DEFAULTs for a generated column.Tom Lane
One can say "INSERT INTO tab(generated_col) VALUES (DEFAULT)" and not draw an error. But the equivalent case for a multi-row VALUES list always threw an error, even if one properly said DEFAULT in each row. Fix that. While here, improve the test cases for nearby logic about OVERRIDING SYSTEM/USER values. Dean Rasheed Discussion: https://postgr.es/m/9q0sgcr416t.fsf@gmx.us
2020-11-21In geo_ops.c, represent infinite slope as Infinity, not DBL_MAX.Tom Lane
Since we're assuming IEEE floats these days, there seems little reason not to do this. It has the advantage that when the slope is computed as infinite due to the presence of Inf coordinates, we get saner behavior than before from line_construct(), and thence also in some dependent operations such as finding the closest point. Also fix line_construct() to special-case slope zero. The previous coding got the right answer in most cases, but it could compute C as NaN when the point has Inf coordinates. Discussion: https://postgr.es/m/CAGf+fX70rWFOk5cd00uMfa__0yP+vtQg5ck7c2Onb-Yczp0URA@mail.gmail.com
2020-11-21Fix FPeq() and friends to get the right answers for infinities.Tom Lane
"FPeq(infinity, infinity)" returned false, on account of getting NaN when it subtracts the two inputs. Fix that by adding a separate check for exact equality. FPle() and FPge() similarly got the wrong answer for two like-signed infinities. In those cases, we can just rearrange the comparisons to avoid potentially subtracting infinities. While the sibling functions FPne() etc accidentally gave the right answers even with the internal NaN results, it seems best to make similar adjustments to them to avoid depending on this. FPeq() has to be converted to an inline function to avoid double evaluations of its arguments, and I did the same for the others just for consistency. In passing, make the handling of NaN cases in line_eq() and point_eq_point() simpler and easier to reason about, and perhaps faster. This results in just one visible regression test change: slope() now gives DBL_MAX for two inputs of (inf,1e300), which is consistent with what it does for (1e300,inf), so that seems like a bug fix. Discussion: https://postgr.es/m/CAGf+fX70rWFOk5cd00uMfa__0yP+vtQg5ck7c2Onb-Yczp0URA@mail.gmail.com
2020-11-21Extend the geometric regression test cases a little.Tom Lane
Add another edge-case value to "point_tbl", and add a test for the line(point, point) function. Some of the behaviors exposed here are wrong, but the idea of committing this separately is to memorialize what we were getting, and to allow easier inspection of the behavior changes caused by upcoming patches. Kyotaro Horiguchi (line() test added by me) Discussion: https://postgr.es/m/CAGf+fX70rWFOk5cd00uMfa__0yP+vtQg5ck7c2Onb-Yczp0URA@mail.gmail.com
2020-11-21Remove INSERT privilege check at table creation of CTAS and matviewMichael Paquier
As per discussion with Peter Eisentraunt, the SQL standard specifies that any tuple insertion done as part of CREATE TABLE AS happens without any extra ACL check, so it makes little sense to keep a check for INSERT privileges when using WITH DATA. Materialized views are not part of the standard, but similarly, this check can be confusing as this refers to an access check on a table created within the same command as the one that would insert data into this table. This commit removes the INSERT privilege check for WITH DATA, the default, that 846005e removed partially, but only for WITH NO DATA. Author: Bharath Rupireddy Discussion: https://postgr.es/m/d049c272-9a47-d783-46b0-46665b011598@enterprisedb.com
2020-11-20Make pg_rewind test case more stable.Heikki Linnakangas
If replication is exceptionally slow for some reason, pg_rewind might run before the test row has been replicated. Add an explicit wait for it. Reported-by: Andres Freund Discussion: https://www.postgresql.org/message-id/20201120003811.iknhqwatitw2vvxf%40alap3.anarazel.de
2020-11-20Remove ability to independently select random number generatorMagnus Hagander
Remove the ability to select random number generator independently from SSL library. Instead, use the random number generator from the SSL library (today only OpenSSL supported) if one is configured. If no SSL library is configured, use the platform default (which means use CryptoAPI on Win32 and /dev/urandom on Linux). This also restructures pg_strong_random.c to have three clearly separate sections, one for each implementation, with two functions in each, instead of a scattered set of ifdefs throughout the whole file. Author: Daniel Gustafsson, Magnus Hagander, Michael Paquier Discussion: https://postgr.es/m/632623.1605460616@sss.pgh.pa.us
2020-11-20Replace a macro by a functionPeter Eisentraut
Using a macro is ugly and not justified here. Discussion: https://www.postgresql.org/message-id/flat/4ad69a4c-cc9b-0dfe-0352-8b1b0cd36c7b@2ndquadrant.com
2020-11-20Add collation versions for FreeBSD.Thomas Munro
On FreeBSD 13, use querylocale() to read the current version of libc collations. Similar to commits 352f6f2d for Windows and d5ac14f9 for GNU/Linux. Discussion: https://postgr.es/m/CAEepm%3D0uEQCpfq_%2BLYFBdArCe4Ot98t1aR4eYiYTe%3DyavQygiQ%40mail.gmail.com
2020-11-20Emit log when restore_command succeeds but archived file faills to be restored.Fujii Masao
Previously, when restore_command claimed to succeed but failed to restore the file with the right name, for example, due to mis-configuration of restore_command, no log message was reported. Then the recovery failed later with an error message not directly related to the issue. This commit changes the recovery so that a log message is emitted in this error case. This would enable us to investigate what happened in this case more easily. Author: Jeff Janes, Fujii Masao Reviewed-by: Pavel Borisov, Kyotaro Horiguchi Discussion: https://postgr.es/m/CAMkU=1xkFs3Omp4JR4wMYWdam_KLuj6LXnTYfU8u3T0h=PLLMQ@mail.gmail.com
2020-11-20On macOS, use -isysroot in link steps as well as compile steps.Tom Lane
We previously put the -isysroot switch only into CPPFLAGS, theorizing that it was only needed to find the right copies of include files. However, it seems that we also need to use it while linking programs, to find the right stub ".tbd" files for libraries. We got away without that up to now, but apparently that was mostly luck. It may also be that failures are only observed when the Xcode version is noticeably out of sync with the host macOS version; the case that's prompting action right now is that builds fail when using latest Xcode (12.2) on macOS Catalina, even though it's fine on Big Sur. Hence, add -isysroot to LDFLAGS as well. (It seems that the more common practice is to put it in CFLAGS, whence it'd be included at both compile and link steps. However, we can't mess with CFLAGS in the platform template file without confusing configure's logic for choosing default CFLAGS.) This should be back-patched, but first let's see if the buildfarm likes it on HEAD. Report and patch by James Hilliard (some cosmetic mods by me) Discussion: https://postgr.es/m/20201120003314.20560-1-james.hilliard1@gmail.com
2020-11-19Remove undocumented IS [NOT] OF syntax.Tom Lane
This feature was added a long time ago, in 7c1e67bd5 and eb121ba2c, but never documented in any user-facing way. (Documentation added in 6126d3e70 was commented out almost immediately, in 8272fc3f7.) That's because, while this syntax is defined by SQL:99, our implementation is only vaguely related to the standard's semantics. The standard appears to intend a run-time not parse-time test, and it definitely intends that the test should understand subtype relationships. No one has stepped up to fix that in the intervening years, but people keep coming across the code and asking why it's not documented. Let's just get rid of it: if anyone ever wants to make it work per spec, they can easily recover whatever parts of this code are still of value from our git history. If there's anyone out there who's actually using this despite its undocumented status, they can switch to using pg_typeof() instead, eg. "pg_typeof(something) = 'mytype'::regtype". That gives essentially the same semantics as what our IS OF code did. (We didn't have that function last time this was discussed, or we would have ripped out IS OF then.) Discussion: https://postgr.es/m/CAKFQuwZ2pTc-DSkOiTfjauqLYkNREeNZvWmeg12Q-_69D+sYZA@mail.gmail.com Discussion: https://postgr.es/m/BAY20-F23E9F2B4DAB3E4E88D3623F99B0@phx.gbl Discussion: https://postgr.es/m/3E7CF81D.1000203@joeconway.com
2020-11-19Further fixes for CREATE TABLE LIKE: cope with self-referential FKs.Tom Lane
Commit 502898192 was too careless about the order of execution of the additional ALTER TABLE operations generated by expandTableLikeClause. It just stuck them all at the end, which seems okay for most purposes. But it falls down in the case where LIKE is importing a primary key or unique index and the outer CREATE TABLE includes a FOREIGN KEY constraint that needs to depend on that index. Weird as that is, it used to work, so we ought to keep it working. To fix, make parse_utilcmd.c insert LIKE clauses between index-creation and FK-creation commands in the transformed list of commands, and change utility.c so that the commands generated by expandTableLikeClause are executed immediately not at the end. One could imagine scenarios where this wouldn't work either; but currently expandTableLikeClause only makes column default expressions, CHECK constraints, and indexes, and this ordering seems fine for those. Per bug #16730 from Sofoklis Papasofokli. Like the previous patch, back-patch to all supported branches. Discussion: https://postgr.es/m/16730-b902f7e6e0276b30@postgresql.org
2020-11-19Rename object in test to avoid conflictPeter Eisentraut
In 01e658fa74cb7e3292448f6663b549135958003b, the hash_func test creates a type t1, but apparently a test running in parallel might also use that name, depending on timing. Rename the type to avoid the issue.
2020-11-19Hash support for row typesPeter Eisentraut
Add hash functions for the record type as well as a hash operator family and operator class for the record type. This enables all the hash functionality for the record type such as hash-based plans for UNION/INTERSECT/EXCEPT DISTINCT, recursive queries using UNION DISTINCT, hash joins, and hash partitioning. Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://www.postgresql.org/message-id/flat/38eccd35-4e2d-6767-1b3c-dada1eac3124%402ndquadrant.com
2020-11-19Add BarrierArriveAndDetachExceptLast().Thomas Munro
Provide a way for one process to continue the remaining phases of a (previously) parallel computation alone. Later patches will use this to extend Parallel Hash Join. Author: Melanie Plageman <melanieplageman@gmail.com> Reviewed-by: Thomas Munro <thomas.munro@gmail.com> Discussion: https://postgr.es/m/CA%2BhUKG%2BA6ftXPz4oe92%2Bx8Er%2BxpGZqto70-Q_ERwRaSyA%3DafNg%40mail.gmail.com
2020-11-19Improve failure detection with array parsing in pg_dumpMichael Paquier
Similarly to 3636efa, the checks done in pg_dump when parsing array values from catalogs have been too lax. Under memory pressure, it could be possible, though very unlikely, to finish with dumps that miss some data like: - Statistics for indexes - Run-time configuration of functions - Configuration of extensions - Publication list for a subscription No backpatch is done as this is not going to be a problem in practice. For example, if an OOM causes an array parsing to fail, a follow-up code path of pg_dump would most likely complain with an allocation failure due to the memory pressure. Author: Michael Paquier Reviewed-by: Daniel Gustafsson Discussion: https://postgr.es/m/20201111061319.GE2276@paquier.xyz
2020-11-18Relax lock level for setting PGPROC->statusFlagsAlvaro Herrera
We don't actually need a lock to set PGPROC->statusFlags itself; what we do need is a shared lock on either XidGenLock or ProcArrayLock in order to ensure MyProc->pgxactoff keeps still while we modify the mirror array in ProcGlobal->statusFlags. Some places were using an exclusive lock for that, which is excessive. Relax those to use shared lock only. procarray.c has a couple of places with somewhat brittle assumptions about PGPROC changes: ProcArrayEndTransaction uses only shared lock, so it's permissible to change MyProc only. On the other hand, ProcArrayEndTransactionInternal also changes other procs, so it must hold exclusive lock. Add asserts to ensure those assumptions continue to hold. Author: Álvaro Herrera <alvherre@alvh.no-ip.org> Reviewed-by: Michael Paquier <michael@paquier.xyz> Discussion: https://postgr.es/m/20201117155501.GA13805@alvherre.pgsql
2020-11-18Skip allocating hash table in EXPLAIN-only mode.Heikki Linnakangas
Author: Alexey Bashtanov Discussion: https://www.postgresql.org/message-id/36823f65-050d-ae24-aa4d-a37726998240%40imap.cc
2020-11-18Add more tests for hashing and hash-based plansPeter Eisentraut
- Test hashing of an array of a non-hashable element type. - Test UNION [DISTINCT] with hash- and sort-based plans. (Previously, only INTERSECT and EXCEPT where tested there.) - Test UNION [DISTINCT] with a non-hashable column type. This currently reverts to a sort-based plan even if enable_hashagg is on. - Test UNION/INTERSECT/EXCEPT hash- and sort-based plans with arrays as column types. Also test an array with a non-hashable element type. - Test UNION/INTERSECT/EXCEPT similarly with row types as column types. Currently, this uses only sort-based plans because there is no hashing support for row types. - Add a test case that shows that recursive queries using UNION [DISTINCT] require hashable column types. - Add a currently failing test that uses UNION DISTINCT in a cycle-detection use case using row types as column types. Discussion: https://www.postgresql.org/message-id/flat/38eccd35-4e2d-6767-1b3c-dada1eac3124%402ndquadrant.com
2020-11-18Add tab completion for CREATE [OR REPLACE] TRIGGER in psqlMichael Paquier
92bf7e2 has added support for this grammar. Author: Noriyoshi Shinoda Discussion: https://postgr.es/m/TU4PR8401MB115244623CF4724DCA0D507FEEE30@TU4PR8401MB1152.NAMPRD84.PROD.OUTLOOK.COM
2020-11-17Deprecate nbtree's BTP_HAS_GARBAGE flag.Peter Geoghegan
Streamline handling of the various strategies that we have to avoid a page split in nbtinsert.c. When it looks like a leaf page is about to overflow, we now perform deleting LP_DEAD items and deduplication in one central place. This greatly simplifies _bt_findinsertloc(). This has an independently useful consequence: nbtree no longer relies on the BTP_HAS_GARBAGE page level flag/hint for anything important. We still set and unset the flag in the same way as before, but it's no longer treated as a gating condition when considering if we should check for already-set LP_DEAD bits. This happens at the point where the page looks like it might have to be split anyway, so simply checking the LP_DEAD bits in passing is practically free. This avoids missing LP_DEAD bits just because the page-level hint is unset, which is probably reasonably common (e.g. it happens when VACUUM unsets the page-level flag without actually removing index tuples whose LP_DEAD-bit was set recently, after the VACUUM operation began but before it reached the leaf page in question). Note that this isn't a big behavioral change compared to PostgreSQL 13. We were already checking for set LP_DEAD bits regardless of whether the BTP_HAS_GARBAGE page level flag was set before we considered doing a deduplication pass. This commit only goes slightly further by doing the same check for all indexes, even indexes where deduplication won't be performed. We don't completely remove the BTP_HAS_GARBAGE flag. We still rely on it as a gating condition with pg_upgrade'd indexes from before B-tree version 4/PostgreSQL 12. That makes sense because we sometimes have to make a choice among pages full of duplicates when inserting a tuple with pre version 4 indexes. It probably still pays to avoid accessing the line pointer array of a page there, since it won't yet be clear whether we'll insert on to the page in question at all, let alone split it as a result. Author: Peter Geoghegan <pg@bowt.ie> Reviewed-By: Victor Yegorov <vyegorov@gmail.com> Discussion: https://postgr.es/m/CAH2-Wz%3DYpc1PDdk8OVJDChGJBjT06%3DA0Mbv9HyTLCsOknGcUFg%40mail.gmail.com
2020-11-17indexcmds.c: reorder function prototypesAlvaro Herrera
... out of an overabundance of neatnikism, perhaps.
2020-11-17nbtree: Rename nbtinsert.c variables for consistency.Peter Geoghegan
Stop naming special area/opaque pointer variables 'lpageop' in contexts where it doesn't make sense. This is a holdover from a time when logic that performs tasks that are now spread across _bt_insertonpg(), _bt_findinsertloc(), and _bt_split() was more centralized. 'lpageop' denotes "left page", which doesn't make sense outside of contexts in which there isn't also a right page. Also acquire page flag variables up front within _bt_insertonpg(). This makes it closer to _bt_split() following refactoring commit bc3087b626d. This allows the page split and retail insert paths to both make use of the same variables.
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