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* Fix multi-table VACUUM VERBOSE accounting.Peter Geoghegan2022-04-15
| | | | | | | | | | | | | | | | Per-backend global variables like VacuumPageHit are initialized once per VACUUM command. This was missed by commit 49c9d9fc, which unified VACUUM VERBOSE and autovacuum logging. As a result of that oversight, incorrect values were shown when multiple relations were processed by a single VACUUM VERBOSE command. Relations that happened to be processed later on would show "buffer usage:" values that incorrectly included buffer accesses made while processing earlier unrelated relations. The same accesses were counted multiple times. To fix, take initial values for the tracker variables at the start of heap_vacuum_rel(), and report delta values later on.
* psql: fix \l display for pre-v15 databases.Tom Lane2022-04-15
| | | | | | | | | | | | | | With a pre-v15 server, show NULL for the "ICU Locale" column, matching what you see in v15 when the database locale isn't ICU. The previous coding incorrectly repeated datcollate here. (There's an unfinished discussion about whether to consolidate these columns in \l output, but in any case we'd want this fix for \l+ output.) Euler Taveira, per report from Christoph Berg Discussion: https://postgr.es/m/YlmIFCqu+TZSW4rB@msg.df7cb.de
* Tighten ComputeXidHorizons' handling of walsenders.Tom Lane2022-04-15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | ComputeXidHorizons (nee GetOldestXmin) thought that it could identify walsenders by checking for proc->databaseId == 0. Perhaps that was safe when the code was written, but it's been wrong at least since autovacuum was invented. Background processes that aren't connected to any particular database, such as the autovacuum launcher and logical replication launcher, look like that too. This imprecision is harmful because when such a process advertises an xmin, the result is to hold back dead-tuple cleanup in all databases, though it'd be sufficient to hold it back in shared catalogs (which are the only relations such a process can access). Aside from being generally inefficient, this has recently been seen to cause regression test failures in the buildfarm, as a consequence of the logical replication launcher's startup transaction preventing VACUUM from marking pages of a user table as all-visible. We only want that global hold-back effect for the case where a walsender is advertising a hot standby feedback xmin. Therefore, invent a new PGPROC flag that says that a process' xmin should be considered globally, and check that instead of using the incorrect databaseId == 0 test. Currently only a walsender sets that flag, and only if it is not connected to any particular database. (This is for bug-compatibility with the undocumented behavior of the existing code, namely that feedback sent by a client who has connected to a particular database would not be applied globally. I'm not sure this is a great definition; however, such a client is capable of issuing plain SQL commands, and I don't think we want xmins advertised for such commands to be applied globally. Perhaps this could do with refinement later.) While at it, I rewrote the comment in ComputeXidHorizons, and re-ordered the commented-upon if-tests, to make them match up for intelligibility's sake. This is arguably a back-patchable bug fix, but given the lack of complaints I think it prudent to let it age awhile in HEAD first. Discussion: https://postgr.es/m/1346227.1649887693@sss.pgh.pa.us
* VACUUM VERBOSE: Show dead items for an empty table.Peter Geoghegan2022-04-15
| | | | | | | | | | | | Be consistent about the lines that VACUUM VERBOSE outputs by including an "index scan not needed: " line for completely empty tables. This makes the output more readable, especially with multiple distinct VACUUM operations processed by the same VACUUM command. It's also more consistent; even empty tables can use the failsafe, which wasn't reported in the standard way until now. Follow-up to commit 6e20f460, which taught VACUUM VERBOSE to be more consistent about reporting on scanned pages with empty tables.
* Adjust VACUUM's removable cutoff log message.Peter Geoghegan2022-04-15
| | | | | | | | | | | | | | | | | | | | | The age of OldestXmin (a.k.a. "removable cutoff") when VACUUM ends often indicates the approximate number of XIDs consumed while VACUUM ran. However, there is at least one important exception: the cutoff could be held back by a snapshot that was acquired before our VACUUM even began. Successive VACUUM operations may even use exactly the same old cutoff in extreme cases involving long held snapshots. The log messages that described how removable cutoff aged (which were added by commit 872770fd) created the impression that we were reporting on how VACUUM's usable cutoff advanced while VACUUM ran, which was misleading in these extreme cases. Fix by using a more general wording. Per gripe from Tom Lane. In passing, relocate related instrumentation code for clarity. Author: Peter Geoghegan <pg@bowt.ie> Discussion: https://postgr.es/m/1643035.1650035653@sss.pgh.pa.us
* Revert "Temporarily add some probes of tenk1's relallvisible in ↵Tom Lane2022-04-15
| | | | | | | create_index.sql." This reverts commit 5bb2b6abc8d6cf120a814317816e4384bcbb9c1e. Not needed anymore.
* Small cleanups in SQL/JSON codeAndrew Dunstan2022-04-15
| | | | | | These are to keep Coverity happy. In one case remove a redundant NULL check, and in another explicitly ignore a function result that is already known.
* pgstat: set timestamps of fixed-numbered stats after a crash.Andres Freund2022-04-14
| | | | | | | | | | | | When not loading stats at startup (i.e. pgstat_discard_stats() getting called), reset timestamps of fixed numbered stats would be left at 0. Oversight in 5891c7a8ed8. Instead use pgstat_reset_after_failure() and add tests verifying that fixed-numbered reset timestamps are set appropriately. Reported-By: "David G. Johnston" <david.g.johnston@gmail.com> Discussion: https://postgr.es/m/CAKFQuwamFuaQHKdhcMt4Gbw5+Hca2UE741B8gOOXoA=TtAd2Yw@mail.gmail.com
* Have CLUSTER ignore partitions not owned by callerAlvaro Herrera2022-04-14
| | | | | | | | | | | | | | | | If a partitioned table has partitions owned by roles other than the owner of the partitioned table, don't include them in the to-be- clustered list. This is similar to what VACUUM FULL does (except we do it sooner, because there is no reason to postpone it). Add a simple test to verify that only owned partitions are clustered. While at it, change memory context switch-and-back to occur once per partition instead of outside of the loop. Author: Justin Pryzby <pryzby@telsasoft.com> Reviewed-by: Zhihong Yu <zyu@yugabyte.com> Reviewed-by: Michael Paquier <michael@paquier.xyz> Discussion: https://postgr.es/m/20220411140609.GF26620@telsasoft.com
* Temporarily add some probes of tenk1's relallvisible in create_index.sql.Tom Lane2022-04-14
| | | | | | | | This is to gather some more evidence about why buildfarm member wrasse is failing. We should revert it (or at least scale it way back) once that's resolved. Discussion: https://postgr.es/m/1346227.1649887693@sss.pgh.pa.us
* Improve a couple of sql/json error messagesAndrew Dunstan2022-04-14
| | | | Fix the grammar in two, and add a hint to one.
* Fix transformJsonBehaviorAndrew Dunstan2022-04-14
| | | | | | | Commit 1a36bc9dba8 conained some logic that was a little opaque and could have involved a NULL dereference, as complained about by Coverity. Make the logic more transparent and in doing so avoid the NULL dereference.
* Add missing spaces after single-line commentsDavid Rowley2022-04-14
| | | | | | | | | | | | | Only 1 of 3 of these changes appear to be handled by pgindent. That change is new to v15. The remaining two appear to be left alone by pgindent. The exact reason for that is not 100% clear to me. It seems related to the fact that it's a line that contains *only* a single line comment and no actual code. It does not seem worth investigating this in too much detail. In any case, these do not conform to our usual practices, so fix them. Author: Justin Pryzby Discussion: https://postgr.es/m/20220411020336.GB26620@telsasoft.com
* Fix case sensitivity in psql's tab completion for GUC names.Tom Lane2022-04-13
| | | | | | | | | | | | Input for these should be case-insensitive, but was not completely so. Comparing to the similar queries for timezone names, I realized that we'd missed forcing the comparison pattern to lower-case. With that, it behaves as I expect. While here, flatten the sub-selects in these queries; I don't find that those add any readability. Discussion: https://postgr.es/m/3369130.1649348542@sss.pgh.pa.us
* Further tweak the default behavior of psql's \dconfig.Tom Lane2022-04-13
| | | | | | | | | | | | | Define "parameters with non-default settings" as being those that not only have pg_settings.source different from 'default', but also have a current value different from the hard-wired boot_val. Adding the latter restriction removes a number of not-very-interesting cases where the active setting is chosen by initdb but in practice tends to be the same all the time. Per discussion with Jonathan Katz. Discussion: https://postgr.es/m/YlFQLzlPi4QD0wSi@msg.df7cb.de
* Prevent access to no-longer-pinned buffer in heapam_tuple_lock().Tom Lane2022-04-13
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | heap_fetch() used to have a "keep_buf" parameter that told it to return ownership of the buffer pin to the caller after finding that the requested tuple TID exists but is invisible to the specified snapshot. This was thoughtlessly removed in commit 5db6df0c0, which broke heapam_tuple_lock() (formerly EvalPlanQualFetch) because that function needs to do more accesses to the tuple even if it's invisible. The net effect is that we would continue to touch the page for a microsecond or two after releasing pin on the buffer. Usually no harm would result; but if a different session decided to defragment the page concurrently, we could see garbage data and mistakenly conclude that there's no newer tuple version to chain up to. (It's hard to say whether this has happened in the field. The bug was actually found thanks to a later change that allowed valgrind to detect accesses to non-pinned buffers.) The most reasonable way to fix this is to reintroduce keep_buf, although I made it behave slightly differently: buffer ownership is passed back only if there is a valid tuple at the requested TID. In HEAD, we can just add the parameter back to heap_fetch(). To avoid an API break in the back branches, introduce an additional function heap_fetch_extended() in those branches. In HEAD there is an additional, less obvious API change: tuple->t_data will be set to NULL in all cases where buffer ownership is not returned, in particular when the tuple exists but fails the time qual (and !keep_buf). This is to defend against any other callers attempting to access non-pinned buffers. We concluded that making that change in back branches would be more likely to introduce problems than cure any. In passing, remove a comment about heap_fetch that was obsoleted by 9a8ee1dc6. Per bug #17462 from Daniil Anisimov. Back-patch to v12 where the bug was introduced. Discussion: https://postgr.es/m/17462-9c98a0f00df9bd36@postgresql.org
* Remove extraneous blank lines before block-closing bracesAlvaro Herrera2022-04-13
| | | | | | | | | These are useless and distracting. We wouldn't have written the code with them to begin with, so there's no reason to keep them. Author: Justin Pryzby <pryzby@telsasoft.com> Discussion: https://postgr.es/m/20220411020336.GB26620@telsasoft.com Discussion: https://postgr.es/m/attachment/133167/0016-Extraneous-blank-lines.patch
* Release cache tuple when no longer neededAlvaro Herrera2022-04-13
| | | | | | | | | | | | There was a small buglet in commit 52e4f0cd472d whereby a tuple acquired from cache was not released, giving rise to WARNING messages; fix that. While at it, restructure the code a bit on stylistic grounds. Author: Hou zj <houzj.fnst@fujitsu.com> Reported-by: Peter Smith <smithpb2250@gmail.com> Reviewed-by: Amit Kapila <amit.kapila16@gmail.com> Discussion: https://postgr.es/m/CAHut+PvKTyhTBtYCQsP6Ph7=o-oWRSX+v+PXXLXp81-o2bazig@mail.gmail.com
* Fix finalization for json_objectagg and friendsAndrew Dunstan2022-04-13
| | | | | | | | | | | | | Commit f4fb45d15c misguidedly tried to free some state during aggregate finalization for json_objectagg. This resulted in attempts to access freed memory, especially when the function is used as a window function. Commit 4eb9798879 attempted to ameliorate that, but in fact it should just be ripped out, which is done here. Also add some regression tests for json_objectagg in various flavors as a window function. Original report from Jaime Casanova, diagnosis by Andres Freund. Discussion: https://postgr.es/m/YkfeMNYRCGhySKyg@ahch-to
* Fix incorrect format placeholdersPeter Eisentraut2022-04-13
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* Remove "recheck" argument from check_index_is_clusterable()Michael Paquier2022-04-13
| | | | | | | | | | | The last usage of this argument in this routine can be tracked down to 7e2f9062, aka 11 years ago. Getting rid of this argument can also be an advantage for extensions calling check_index_is_clusterable(), as it removes any need to worry about the meaning of what a recheck would be at this level. Author: Justin Pryzby Discussion: https://postgr.es/m/20220411140609.GF26620@telsasoft.com
* Rework compression options of pg_receivewalMichael Paquier2022-04-13
| | | | | | | | | | | | | | | | | | | | | | | | | | | Since babbbb5 and the introduction of LZ4 in pg_receivewal, the compression of the WAL archived is controlled by two options: - --compression-method with "gzip", "none" or "lz4" as possible value. - --compress=N to specify a compression level. This includes a backward-incompatible change where a value of 0 leads to a failure instead of no compression enforced. This commit takes advantage of a4b5754 and 3603f7c to rework the compression options of pg_receivewal, as of: - The removal of --compression-method. - The extenction of --compress to use the same grammar as pg_basebackup, with a METHOD:DETAIL format, where a METHOD is "gzip", "none" or "lz4" and a DETAIL is a comma-separated list of options, the only keyword supported is now "level" to control the compression level. If only an integer is specified as value of this option, "none" is implied on 0 and "gzip" is implied otherwise. This brings back --compress to be backward-compatible with ~14, while still supporting LZ4. This has also the advantage of centralizing the set of checks used by pg_receivewal to validate its compression options. Author: Michael Paquier Reviewed-by: Robert Haas, Georgios Kokolatos Discussion: https://postgr.es/m/YlPQGNAAa04raObK@paquier.xyz
* Revert the addition of GetMaxBackends() and related stuff.Robert Haas2022-04-12
| | | | | | | | | | | | This reverts commits 0147fc7, 4567596, aa64f23, and 5ecd018. There is no longer agreement that introducing this function was the right way to address the problem. The consensus now seems to favor trying to make a correct value for MaxBackends available to mdules executing their _PG_init() functions. Nathan Bossart Discussion: http://postgr.es/m/20220323045229.i23skfscdbvrsuxa@jrouhaud
* Remove not-very-useful early checks of __pg_log_level in logging.h.Tom Lane2022-04-12
| | | | | | | | | | | | | | | | | Enforce __pg_log_level message filtering centrally in logging.c, instead of relying on the calling macros to do it. This is more reliable (e.g. it works correctly for direct calls to pg_log_generic) and it saves a percent or so of total code size because we get rid of so many duplicate checks of __pg_log_level. This does mean that argument expressions in a logging macro will be evaluated even if we end up not printing anything. That seems of little concern for INFO and higher levels as those messages are printed by default, and most of our frontend programs don't even offer a way to turn them off. I left the unlikely() checks in place for DEBUG messages, though. Discussion: https://postgr.es/m/3993549.1649449609@sss.pgh.pa.us
* Use WRITE_ENUM_FIELD for enum fieldPeter Eisentraut2022-04-12
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* Make node output prefix match node structure namePeter Eisentraut2022-04-12
| | | | as done in e58136069687b9cf29c27281e227ac397d72141d
* adjust_partition_colnos mustn't be called if not neededAlvaro Herrera2022-04-12
| | | | | | | | | | Add an assert to make this very explicit, as well as a code comment. The former should silence Coverity complaining about this. Introduced by 7103ebb7aae8. Reported-by: Ranier Vilela Discussion: https://postgr.es/m/CAEudQAqTTAOzXiYybab+1DQOb3ZUuK99=p_KD+yrRFhcDbd0jg@mail.gmail.com
* Remove WalCompressionMethod in favor of pg_compress_algorithmMichael Paquier2022-04-12
| | | | | | | | | | | | | | | | The same structure, with the same set of elements (for none, lz4, gzip and zstd), exists in compression.h, so let's make use of the centralized version instead of duplicating things. Some of the variables used previously for WalCompressionMethod are renamed to stick better with the new structure and routine names. WalCompressionMethod was leading to some confusion in walmethods.c, as it was sometimes used to refer to some data unrelated to WAL. Reported-by: Robert Haas Author: Michael Paquier Reviewed-by: Robert Haas, Georgios Kokolatos Discussion: https://postgr.es/m/YlPQGNAAa04raObK@paquier.xyz
* Change mechanism to set up source targetlist in MERGEAlvaro Herrera2022-04-12
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | We were setting MERGE source subplan's targetlist by expanding the individual attributes of the source relation completely, early in the parse analysis phase. This failed to work when the condition of an action included a whole-row reference, causing setrefs.c to error out with ERROR: variable not found in subplan target lists because at that point there is nothing to resolve the whole-row reference with. We can fix this by having preprocess_targetlist expand the source targetlist for Vars required from the source rel by all actions. Moreover, by using this expansion mechanism we can do away with the targetlist expansion in transformMergeStmt, which is good because then we no longer pull in columns that aren't needed for anything. Add a test case for the problem. While at it, remove some redundant code in preprocess_targetlist(): MERGE was doing separately what is already being done for UPDATE/DELETE, so we can just rely on the latter and remove the former. (The handling of inherited rels was different for MERGE, but that was a no-longer- necessary hack.) Fix outdated, related comments for fix_join_expr also. Author: Richard Guo <guofenglinux@gmail.com> Author: Álvaro Herrera <alvherre@alvh.no-ip.org> Reported-by: Joe Wildish <joe@lateraljoin.com> Discussion: https://postgr.es/m/fab3b90a-914d-46a9-beb0-df011ee39ee5@www.fastmail.com
* Rename backup_compression.{c,h} to compression.{c,h}Michael Paquier2022-04-12
| | | | | | | | | | | | | | | | | | Compression option handling (level, algorithm or even workers) can be used across several parts of the system and not only base backups. Structures, objects and routines are renamed in consequence, to remove the concept of base backups from this part of the code making this change straight-forward. pg_receivewal, that has gained support for LZ4 since babbbb5, will make use of this infrastructure for its set of compression options, bringing more consistency with pg_basebackup. This cleanup needs to be done before releasing a beta of 15. pg_dump is a potential future target, as well, and adding more compression options to it may happen in 16~. Author: Michael Paquier Reviewed-by: Robert Haas, Georgios Kokolatos Discussion: https://postgr.es/m/YlPQGNAAa04raObK@paquier.xyz
* Make XLogRecGetBlockTag() throw error if there's no such block.Tom Lane2022-04-11
| | | | | | | | | | | | | | | | | | | | | | | | All but a few existing callers assume without checking that this function succeeds. While it probably will, that's a poor excuse for not checking. Let's make it return void and instead throw an error if it doesn't find the block reference. Callers that actually need to handle the no-such-block case must now use the underlying function XLogRecGetBlockTagExtended. In addition to being a bit less error-prone, this should also serve to suppress some Coverity complaints about XLogRecGetBlockRefInfo. While at it, clean up some inconsistency about use of the XLogRecHasBlockRef macro: make XLogRecGetBlockTagExtended use that instead of open-coding the same condition, and avoid calling XLogRecHasBlockRef twice in relevant code paths. (That is, calling XLogRecHasBlockRef followed by XLogRecGetBlockTag is now deprecated: use XLogRecGetBlockTagExtended instead.) Patch HEAD only; this doesn't seem to have enough value to consider a back-branch API break. Discussion: https://postgr.es/m/425039.1649701221@sss.pgh.pa.us
* Remove comment about historic heap vacuuming issue.Peter Geoghegan2022-04-11
| | | | | | | | | Remove comment block about how heap page vacuuming used to set tuples with storage to LP_UNUSED in a rare edge case that can no longer happen following commit 8523492d4e. The comments seem unnecessary now, since it's now generally clear that heap vacuuming only applies to LP_DEAD items from VACUUM's first heap pass following more recent work from commits 12b5ade902 and 4f8d9d1217.
* Remove dead code in do_pg_backup_start().Tom Lane2022-04-11
| | | | | | | | | | As of commit 39969e2a1, no caller of do_pg_backup_start() passes NULL for labelfile or tblspcmapfile, nor is it plausible that any would do so in the future. Remove the code that coped with that case, as (a) it's dead and (b) it causes Coverity to bleat about possibly leaked storage. While here, do some janitorial work on the function's header comment.
* Tweak the default behavior of psql's \dconfig.Tom Lane2022-04-11
| | | | | | | | | | | | \dconfig without an argument originally printed all parameters, but it seems more useful to print only those parameters with non-default settings. You can easily get the show-everything behavior with "\dconfig *", but that output is unwieldy and seems unlikely to be wanted very often. Per suggestion from Christoph Berg. Discussion: https://postgr.es/m/YlFQLzlPi4QD0wSi@msg.df7cb.de
* Explicitly ignore guaranteed-true result from pgstat_lock_entry().Tom Lane2022-04-11
| | | | | | With nowait passed as false, pgstat_lock_entry() must return true so there's no need to check its result. Coverity seems unconvinced of this, so whack it upside the head with a (void) cast.
* fgetc() returns int, not char.Tom Lane2022-04-11
| | | | | This has no practical effect, since this code doesn't actually need to distinguish EOF (-1) from \0377; but it silences a Coverity complaint.
* Add color support for new frontend detail/hint messagesPeter Eisentraut2022-04-11
| | | | As before, the defaults are similar to gcc's default appearance.
* Avoid re-writing files unnecessarily in src/tools/copyright.pl.Tom Lane2022-04-11
| | | | | | | | | | The existing coding resulted in touching every copyright-containing file in the tree, even if it was already up to date. That doesn't matter much for the annual run, but it's an annoyance if you try to use the script for mop-up at the close of a devel cycle, as I just did. Discussion: https://postgr.es/m/266030.1649685473@sss.pgh.pa.us
* Fix various typos and spelling mistakes in code commentsDavid Rowley2022-04-11
| | | | | Author: Justin Pryzby Discussion: https://postgr.es/m/20220411020336.GB26620@telsasoft.com
* Fix the dates of some copyright noticesMichael Paquier2022-04-11
| | | | | | | | 0ad8032 and 4e34747 are at the origin of that. Julien has found the one in parse_jsontable.c, while I have spotted the rest. Author: Julien Rouhaud, Michael Paquier Discussion: https://postgr.es/m/20220411060838.ftnzyvflpwu6f74w@jrouhaud
* Put new command-line options into alphabetical order in help outputPeter Eisentraut2022-04-11
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* Fix pgperlsyncheck following SSL TAP test refactoringAndrew Dunstan2022-04-10
| | | | | | | Commit 4a7e964fc6 made pgperlsyncheck fail, but apparently nobody noticed, although the buildfarm module that does more or less the same thing was modified. So fix the in-core test. I will look at unifying the two sets of tests so we avoid a future mismatch.
* Add timestamp and elapsed time decorations to TAP test logsAndrew Dunstan2022-04-10
| | | | | | | | | | These apply to traces from Test::More functions such as ok(), is(), diag() and note(). Output from other sources (e.g. external programs such a initdb) is not affected. The elapsed time is the time since the last such trace (or the beginning of the test in the first case). Times and timestamps are at millisecond precision. Discussion: https://postgr.es/m/20220401172150.rsycz4lrn7ewruil@alap3.anarazel.de
* Fix whitespacePeter Eisentraut2022-04-09
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* Add missing serial commasPeter Eisentraut2022-04-09
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* Add missing source files to nls.mkPeter Eisentraut2022-04-09
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* Silence compiler warnings for unsupported compression methods.Tom Lane2022-04-08
| | | | | | wrasse, at least, moans about the lack of any "return" statement in these functions. You'd think pretty much everything would know that exit(1) doesn't return, but evidently not.
* Improve frontend error logging style.Tom Lane2022-04-08
| | | | | | | | | | | | | | | | | | | | | | | | Get rid of the separate "FATAL" log level, as it was applied so inconsistently as to be meaningless. This mostly involves s/pg_log_fatal/pg_log_error/g. Create a macro pg_fatal() to handle the common use-case of pg_log_error() immediately followed by exit(1). Various modules had already invented either this or equivalent macros; standardize on pg_fatal() and apply it where possible. Invent the ability to add "detail" and "hint" messages to a frontend message, much as we have long had in the backend. Except where rewording was needed to convert existing coding to detail/hint style, I have (mostly) resisted the temptation to change existing message wording. Patch by me. Design and patch reviewed at various stages by Robert Haas, Kyotaro Horiguchi, Peter Eisentraut and Daniel Gustafsson. Discussion: https://postgr.es/m/1363732.1636496441@sss.pgh.pa.us
* Fix busted .gitignore entry.Tom Lane2022-04-08
| | | | Typo in commit 2258e76f9.
* Rename delayChkpt to delayChkptFlags.Robert Haas2022-04-08
| | | | | | | | | | | | | | | | | | Before commit 412ad7a55639516f284cd0ef9757d6ae5c7abd43, delayChkpt was a Boolean. Now it's an integer. Extensions using it need to be appropriately updated, so let's rename the field to make sure that a hard compilation failure occurs. Replacing delayChkpt with delayChkptFlags made a few comments extend past 80 characters, so I reflowed them and changed some wording very slightly. The back-branches will need a different change to restore compatibility with existing minor releases; this is just for master. Per suggestion from Tom Lane. Discussion: http://postgr.es/m/a7880f4d-1d74-582a-ada7-dad168d046d1@enterprisedb.com
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