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* Optimize sifting down in binaryheap.Nathan Bossart2024-10-30
| | | | | | | | | | | | | | Presently, each iteration of the loop in sift_down() will perform 3 comparisons if both children are larger than the parent node (2 for comparing each child to the parent node, and a third to compare the children to each other). By first comparing the children to each other and then comparing the larger child to the parent node, we can accomplish the same thing with just 2 comparisons (while also not affecting the number of comparisons in any other case). Author: ChangAo Chen Reviewed-by: Robert Haas Discussion: https://postgr.es/m/tencent_0142D8DA90940B9930BCC08348BBD6D0BB07%40qq.com
* meson: Add missing dependency to unicode test programsPeter Eisentraut2024-10-30
| | | | | | | | | | The test programs in src/common/unicode/ (case_test, category_test, norm_test), don't build with meson if the nls option is enabled, because a libintl dependency is missing. Fix that. (The makefiles are ok.) Reviewed-by: Aleksander Alekseev <aleksander@timescale.com> Discussion: https://www.postgresql.org/message-id/flat/52db1d2b-4b96-473e-b323-a4b16a950fba%40eisentraut.org
* Unify src/common/'s definitions of MaxAllocSize.Tom Lane2024-10-28
| | | | | | | | | | As threatened in the previous patch, define MaxAllocSize in src/include/common/fe_memutils.h rather than having several copies of it in different src/common/*.c files. This also provides an opportunity to document it better. While this would probably be safe to back-patch, I'll refrain (for now anyway).
* Guard against enormously long input in pg_saslprep().Tom Lane2024-10-28
| | | | | | | | | | | | | | | | | | | Coverity complained that pg_saslprep() could suffer integer overflow, leading to under-allocation of the output buffer, if the input string exceeds SIZE_MAX/4. This hazard seems largely hypothetical, but it's easy enough to defend against, so let's do so. This patch creates a third place in src/common/ where we are locally defining MaxAllocSize so that we can test against that in the same way in backend and frontend compiles. That seems like about two places too many, so the next patch will move that into common/fe_memutils.h. I'm hesitant to do that in back branches however. Back-patch to v14. The code looks similar in older branches, but before commit 67a472d71 there was a separate test on the input string length that prevented this hazard. Per Coverity report.
* Fix memory leaks from incorrect strsep() usesPeter Eisentraut2024-10-18
| | | | | | | | | | | | | | Commit 5d2e1cc117b introduced some strsep() uses, but it did the memory management wrong in some cases. We need to keep a separate pointer to the allocate memory so that we can free it later, because strsep() advances the pointer we pass to it, and it at the end it will be NULL, so any free() calls won't do anything. (This fixes two of the four places changed in commit 5d2e1cc117b. The other two don't have this problem.) Reported-by: Alexander Lakhin <exclusion@gmail.com> Discussion: https://www.postgresql.org/message-id/flat/79692bf9-17d3-41e6-b9c9-fc8c3944222a@eisentraut.org
* jsonapi: fully initialize dummy lexerPeter Eisentraut2024-10-17
| | | | | | | | | | | Valgrind reports that checks on lex->inc_state are undefined for the "dummy lexer" used for incremental parsing, since it's only partially initialized on the stack. This was introduced in 0785d1b8b2. Zero-initialize the whole struct. Author: Jacob Champion <jacob.champion@enterprisedb.com> Reported-by: Alexander Lakhin <exclusion@gmail.com> Discussion: https://www.postgresql.org/message-id/CAOYmi+n9QWr4gsAADZc6qFQjFViXQYVk=gBy_EvxuqsgPJcb_g@mail.gmail.com
* Whitespace fixup from generated unicode tables.Jeff Davis2024-10-16
| | | | | When running the 'update-unicode' build target, generate files that conform to pgindent whitespace rules.
* File size in a backup manifest should use uint64, not size_t.Robert Haas2024-10-02
| | | | | | | | size_t is the size of an object in memory, not the size of a file on disk. Thanks to Tom Lane for noting the error. Discussion: http://postgr.es/m/1865585.1727803933@sss.pgh.pa.us
* jsonapi: fix memory leakage during OOM error recovery.Tom Lane2024-09-23
| | | | | | | | | | Coverity pointed out that inc_lex_level() would leak memory (not to mention corrupt the pstack data structure) if some but not all of its three REALLOC's failed. To fix, store successfully-updated pointers back into the pstack struct immediately. Oversight in 0785d1b8b, so no need for back-patch.
* common/jsonapi: support libpq as a clientPeter Eisentraut2024-09-11
| | | | | | | | | | | | | | Based on a patch by Michael Paquier. For libpq, use PQExpBuffer instead of StringInfo. This requires us to track allocation failures so that we can return JSON_OUT_OF_MEMORY as needed rather than exit()ing. Author: Jacob Champion <jacob.champion@enterprisedb.com> Co-authored-by: Michael Paquier <michael@paquier.xyz> Co-authored-by: Daniel Gustafsson <daniel@yesql.se> Reviewed-by: Peter Eisentraut <peter@eisentraut.org> Discussion: https://www.postgresql.org/message-id/flat/d1b467a78e0e36ed85a09adf979d04cf124a9d4b.camel@vmware.com
* Protect against small overread in SASLprep validationDaniel Gustafsson2024-09-10
| | | | | | | | | | | | In case of torn UTF8 in the input data we might end up going past the end of the string since we don't account for length. While validation won't be performed on a sequence with a NULL byte it's better to avoid going past the end to beging with. Fix by taking the length into consideration. Author: Jacob Champion <jacob.champion@enterprisedb.com> Reviewed-by: Daniel Gustafsson <daniel@yesql.se> Discussion: https://postgr.es/m/CAOYmi+mTnmM172g=_+Yvc47hzzeAsYPy2C4UBY3HK9p-AXNV0g@mail.gmail.com
* Define PG_TBLSPC_DIR for path pg_tblspc/ in data folderMichael Paquier2024-09-03
| | | | | | | | | | | | | | Similarly to 2065ddf5e34c, this introduces a define for "pg_tblspc". This makes the style more consistent with the existing PG_STAT_TMP_DIR, for example. There is a difference with the other cases with the introduction of PG_TBLSPC_DIR_SLASH, required in two places for recovery and backups. Author: Bertrand Drouvot Reviewed-by: Ashutosh Bapat, Álvaro Herrera, Yugo Nagata, Michael Paquier Discussion: https://postgr.es/m/ZryVvjqS9SnV1GPP@ip-10-97-1-34.eu-west-3.compute.internal
* Remove support for OpenSSL older than 1.1.0Daniel Gustafsson2024-09-02
| | | | | | | | | | | | | | OpenSSL 1.0.2 has been EOL from the upstream OpenSSL project for some time, and is no longer the default OpenSSL version with any vendor which package PostgreSQL. By retiring support for OpenSSL 1.0.2 we can remove a lot of no longer required complexity for managing state within libcrypto which is now handled by OpenSSL. Reviewed-by: Jacob Champion <jacob.champion@enterprisedb.com> Reviewed-by: Peter Eisentraut <peter@eisentraut.org> Reviewed-by: Michael Paquier <michael@paquier.xyz> Discussion: https://postgr.es/m/ZG3JNursG69dz1lr@paquier.xyz Discussion: https://postgr.es/m/CA+hUKGKh7QrYzu=8yWEUJvXtMVm_CNWH1L_TLWCbZMwbi1XP2Q@mail.gmail.com
* Message style improvementsPeter Eisentraut2024-08-29
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* Remove fe_memutils from libpgcommon_shlibPeter Eisentraut2024-08-12
| | | | | | | | | | | | libpq must not use palloc/pfree. It's not allowed to exit on allocation failure, and mixing the frontend pfree with malloc is architecturally unsound. Remove fe_memutils from the shlib build entirely, to keep devs from accidentally depending on it in the future. Author: Jacob Champion <jacob.champion@enterprisedb.com> Discussion: https://www.postgresql.org/message-id/CAOYmi+=pg=W5L1h=3MEP_EB24jaBu2FyATrLXqQHGe7cpuvwyg@mail.gmail.com
* Remove support for old realpath() APIPeter Eisentraut2024-08-12
| | | | | | | | | | | | | The now preferred way to call realpath() is by passing NULL as the second argument and get a malloc'ed result. We still supported the old way of providing our own buffer as a second argument, for some platforms that didn't support the new way yet. Those were only Solaris less than version 11 and some older AIX versions (7.1 and newer appear to support the new variant). We don't support those platforms versions anymore, so we can remove this extra code. Reviewed-by: Heikki Linnakangas <hlinnaka@iki.fi> Discussion: https://www.postgresql.org/message-id/flat/9e638b49-5c3f-470f-a392-2cbedb2f7855%40eisentraut.org
* Make fallback MD5 implementation thread-safe on big-endian systemsHeikki Linnakangas2024-08-07
| | | | | | | | | | | | | Replace a static scratch buffer with a local variable, because a static buffer makes the function not thread-safe. This function is used in client-code in libpq, so it needs to be thread-safe. It was until commit b67b57a966, which replaced the implementation with the one from pgcrypto. Backpatch to v14, where we switched to the new implementation. Reviewed-by: Robert Haas, Michael Paquier Discussion: https://www.postgresql.org/message-id/dfa2015d-ad21-4802-a4cc-3850fc5fff3f@iki.fi
* Mark misc static global variables as constHeikki Linnakangas2024-08-06
| | | | | Reviewed-by: Andres Freund Discussion: https://www.postgresql.org/message-id/54c29fb0-edf2-48ea-9814-44e918bbd6e8@iki.fi
* Make nullSemAction const, add 'const' decorators to related functionsHeikki Linnakangas2024-08-06
| | | | | | | To make it more clear that these should never be modified. Reviewed-by: Andres Freund Discussion: https://www.postgresql.org/message-id/54c29fb0-edf2-48ea-9814-44e918bbd6e8@iki.fi
* Convert some extern variables to static, Windows codePeter Eisentraut2024-08-01
| | | | Similar to 720b0eaae9b, discovered by MinGW.
* Replace some strtok() with strsep()Peter Eisentraut2024-07-22
| | | | | | | | | | | | | | | | | | | | | | | | | | strtok() considers adjacent delimiters to be one delimiter, which is arguably the wrong behavior in some cases. Replace with strsep(), which has the right behavior: Adjacent delimiters create an empty token. Affected by this are parsing of: - Stored SCRAM secrets ("SCRAM-SHA-256$<iterations>:<salt>$<storedkey>:<serverkey>") - ICU collation attributes ("und@colStrength=primary;colCaseLevel=yes") for ICU older than version 54 - PG_COLORS environment variable ("error=01;31:warning=01;35:note=01;36:locus=01") - pg_regress command-line options with comma-separated list arguments (--dbname, --create-role) (currently only used pg_regress_ecpg) Reviewed-by: Kyotaro Horiguchi <horikyota.ntt@gmail.com> Reviewed-by: David Steele <david@pgmasters.net> Discussion: https://www.postgresql.org/message-id/flat/79692bf9-17d3-41e6-b9c9-fc8c3944222a@eisentraut.org
* Typo fixAmit Langote2024-07-08
| | | | | | Reported-by: Junwang Zhao <zhjwpku@gmail.com> Discussion: https://postgr.es/m/CAEG8a3KPi=LayiTwJ11ikF7bcqnZUrcj8NgX0V8nO1mQKZ9GfQ@mail.gmail.com Backpatch-through: 17
* Improve enlargeStringInfo's ERROR messageDavid Rowley2024-07-01
| | | | | | | | | | | | | | Until now, when an enlargeStringInfo() call would cause the StringInfo to exceed its maximum size, we reported an "out of memory" error. This is misleading as it's no such thing. Here we remove the "out of memory" text and replace it with something more relevant to better indicate that it's a program limitation that's been reached. Reported-by: Michael Banck Reviewed-by: Daniel Gustafsson, Tom Lane Discussion: https://postgr.es/m/18484-3e357ade5fe50e61@postgresql.org
* parse_manifest: Use const char *Peter Eisentraut2024-06-21
| | | | | | | | This adapts the manifest parsing code to take advantage of the const-ified jsonapi. Reviewed-by: Andrew Dunstan <andrew@dunslane.net> Discussion: https://www.postgresql.org/message-id/flat/f732b014-f614-4600-a437-dba5a2c3738b%40eisentraut.org
* jsonapi: Use const char *Peter Eisentraut2024-06-21
| | | | | | | | | | Apply const qualifiers to char * arguments and fields throughout the jsonapi. This allows the top-level APIs such as pg_parse_json_incremental() to declare their input argument as const. It also reduces the number of unconstify() calls. Reviewed-by: Andrew Dunstan <andrew@dunslane.net> Discussion: https://www.postgresql.org/message-id/flat/f732b014-f614-4600-a437-dba5a2c3738b%40eisentraut.org
* jsonapi: Use size_tPeter Eisentraut2024-06-21
| | | | | | | | Use size_t instead of int for object sizes in the jsonapi. This makes the API better self-documenting. Reviewed-by: Andrew Dunstan <andrew@dunslane.net> Discussion: https://www.postgresql.org/message-id/flat/f732b014-f614-4600-a437-dba5a2c3738b%40eisentraut.org
* jsonapi: Some message style fixesPeter Eisentraut2024-05-23
| | | | Add missing punctuation, and un-gettext-mark an internal error.
* Make all Perl warnings fatal, catch-upPeter Eisentraut2024-05-15
| | | | Apply c5385929593 to new Perl files that had missed the note.
* Fix incorrect year in some copyright notices added this yearDavid Rowley2024-05-15
| | | | | | | A few patches that were written <= 2023 and committed in 2024 still contained 2023 copyright year. Fix that. Discussion: https://postgr.es/m/CAApHDvr5egyW3FmHbAg-Uq2p_Aizwco1Zjs6Vbq18KqN64-hRA@mail.gmail.com
* Pre-beta mechanical code beautification.Tom Lane2024-05-14
| | | | | | | | | | | | | | Run pgindent, pgperltidy, and reformat-dat-files. The pgindent part of this is pretty small, consisting mainly of fixing up self-inflicted formatting damage from patches that hadn't bothered to add their new typedefs to typedefs.list. In order to keep it from making anything worse, I manually added a dozen or so typedefs that appeared in the existing typedefs.list but not in the buildfarm's list. Perhaps we should formalize that, or better find a way to get those typedefs into the automatic list. pgperltidy is as opinionated as always, and reformat-dat-files too.
* Add missing gettext triggersPeter Eisentraut2024-05-14
| | | | | | | | Commit d6607016c7 moved all the jsonapi.c error messages into token_error(). This needs to be added to the various nls.mk files that use this. Since that makes token_error() effectively a globally known symbol, the name seems a bit too general, so rename to json_token_error() for more clarity.
* Fix overread in JSON parsing errors for incomplete byte sequencesMichael Paquier2024-05-09
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | json_lex_string() relies on pg_encoding_mblen_bounded() to point to the end of a JSON string when generating an error message, and the input it uses is not guaranteed to be null-terminated. It was possible to walk off the end of the input buffer by a few bytes when the last bytes consist of an incomplete multi-byte sequence, as token_terminator would point to a location defined by pg_encoding_mblen_bounded() rather than the end of the input. This commit switches token_terminator so as the error uses data up to the end of the JSON input. More work should be done so as this code could rely on an equivalent of report_invalid_encoding() so as incorrect byte sequences can show in error messages in a readable form. This requires work for at least two cases in the JSON parsing API: an incomplete token and an invalid escape sequence. A more complete solution may be too invasive for a backpatch, so this is left as a future improvement, taking care of the overread first. A test is added on HEAD as test_json_parser makes this issue straight-forward to check. Note that pg_encoding_mblen_bounded() no longer has any callers. This will be removed on HEAD with a separate commit, as this is proving to encourage unsafe coding. Author: Jacob Champion Discussion: https://postgr.es/m/CAOYmi+ncM7pwLS3AnKCSmoqqtpjvA8wmCdoBtKA3ZrB2hZG6zA@mail.gmail.com Backpatch-through: 13
* Remove redundant JSON parser typedefsAndrew Dunstan2024-04-27
| | | | | | | | | JsonNonTerminal and JsonParserSem were added in commit 3311ea86ed These names of these two enums are not actually used, so there is no need for typedefs. Instead use plain enums to declare the constants. Noticed by Alvaro Herera.
* Update src/common/unicode/.gitignorePeter Eisentraut2024-04-22
| | | | for new downloaded files and new build results.
* Fix typos and duplicate wordsDaniel Gustafsson2024-04-18
| | | | | | | | | | | | This fixes various typos, duplicated words, and tiny bits of whitespace mainly in code comments but also in docs. Author: Daniel Gustafsson <daniel@yesql.se> Author: Heikki Linnakangas <hlinnaka@iki.fi> Author: Alexander Lakhin <exclusion@gmail.com> Author: David Rowley <dgrowleyml@gmail.com> Author: Nazir Bilal Yavuz <byavuz81@gmail.com> Discussion: https://postgr.es/m/3F577953-A29E-4722-98AD-2DA9EFF2CBB8@yesql.se
* Assorted minor cleanups in the test_json_parser moduleAndrew Dunstan2024-04-12
| | | | | | | | | | Per gripes from Michael Paquier Discussion: https://postgr.es/m/ZhTQ6_w1vwOhqTQI@paquier.xyz Along the way, also clean up a handful of typos in 3311ea86ed and ea7b4e9a2a, found by Alexander Lakhin, and a couple of stylistic snafus noted by Daniel Westermann and Daniel Gustafsson.
* Fix some memory leaks associated with parsing json and manifestsAndrew Dunstan2024-04-12
| | | | | | | | | | | Coverity complained about not freeing some memory associated with incrementally parsing backup manifests. To fix that, provide and use a new shutdown function for the JsonManifestParseIncrementalState object, in line with a suggestion from Tom Lane. While analysing the problem, I noticed a buglet in freeing memory for incremental json lexers. To fix that remove a bogus condition on freeing the memory allocated for them.
* Revert indexed and enlargable binary heap implementation.Masahiko Sawada2024-04-11
| | | | | | | | | | | This reverts commit b840508644 and bcb14f4abc. These commits were made for commit 5bec1d6bc5 (Improve eviction algorithm in ReorderBuffer using max-heap for many subtransactions). However, per discussion, commit efb8acc0d0 replaced binary heap + index with pairing heap, and made these commits unnecessary. Reported-by: Jeff Davis Discussion: https://postgr.es/m/12747c15811d94efcc5cda72d6b35c80d7bf3443.camel%40j-davis.com
* Silence some compiler warnings in commit 3311ea86edAndrew Dunstan2024-04-05
| | | | Per report from Nathan Bossart
* Fix incorrect calculation in BlockRefTableEntryGetBlocks.Robert Haas2024-04-05
| | | | | | | | | | | | | | The previous formula was incorrect in the case where the function's nblocks argument was a multiple of BLOCKS_PER_CHUNK, which happens whenever a relation segment file is exactly 512MB or exactly 1GB in length. In such cases, the formula would calculate a stop_offset of 0 rather than 65536, resulting in modified blocks in the second half of a 1GB file, or all the modified blocks in a 512MB file, being omitted from the incremental backup. Reported off-list by Tomas Vondra and Jakub Wartak. Discussion: http://postgr.es/m/CA+TgmoYwy_KHp1-5GYNmVa=zdeJWhNH1T0SBmEuvqQNJEHj1Lw@mail.gmail.com
* Tidy up after incremental JSON parser patchAndrew Dunstan2024-04-04
| | | | | | Remove junk left over from non-vpath builds. Try to remedy gettext error on some platforms.
* Fix warnings re typedef redefinition in ea7b4e9a2a and 3311ea86edAndrew Dunstan2024-04-04
| | | | Per gripe from Tom Lane and the buildfarm
* Add support for incrementally parsing backup manifestsAndrew Dunstan2024-04-04
| | | | | | | | | | | | This adds the infrastructure for using the new non-recursive JSON parser in processing manifests. It's important that callers make sure that the last piece of json handed to the incremental manifest parser contains the entire last few lines of the manifest, including the checksum. Author: Andrew Dunstan Reviewed-By: Jacob Champion Discussion: https://postgr.es/m/7b0a51d6-0d9d-7366-3a1a-f74397a02f55@dunslane.net
* Introduce a non-recursive JSON parserAndrew Dunstan2024-04-04
| | | | | | | | | | | | | | | | | | | | | | | This parser uses an explicit prediction stack, unlike the present recursive descent parser where the parser state is represented on the call stack. This difference makes the new parser suitable for use in incremental parsing of huge JSON documents that cannot be conveniently handled piece-wise by the recursive descent parser. One potential use for this will be in parsing large backup manifests associated with incremental backups. Because this parser is somewhat slower than the recursive descent parser, it is not replacing that parser, but is an additional parser available to callers. For testing purposes, if the build is done with -DFORCE_JSON_PSTACK, all JSON parsing is done with the non-recursive parser, in which case only trivial regression differences in error messages should be observed. Author: Andrew Dunstan Reviewed-By: Jacob Champion Discussion: https://postgr.es/m/7b0a51d6-0d9d-7366-3a1a-f74397a02f55@dunslane.net
* Add functions to binaryheap for efficient key removal and update.Masahiko Sawada2024-04-03
| | | | | | | | | | | | | | | | | | | | | | | Previously, binaryheap didn't support updating a key and removing a node in an efficient way. For example, in order to remove a node from the binaryheap, the caller had to pass the node's position within the array that the binaryheap internally has. Removing a node from the binaryheap is done in O(log n) but searching for the key's position is done in O(n). This commit adds a hash table to binaryheap in order to track the position of each nodes in the binaryheap. That way, by using newly added functions such as binaryheap_update_up() etc., both updating a key and removing a node can be done in O(1) on an average and O(log n) in worst case. This is known as the indexed binary heap. The caller can specify to use the indexed binaryheap by passing indexed = true. The current code does not use the new indexing logic, but it will be used by an upcoming patch. Reviewed-by: Vignesh C, Peter Smith, Hayato Kuroda, Ajin Cherian, Tomas Vondra, Shubham Khanna Discussion: https://postgr.es/m/CAD21AoDffo37RC-eUuyHJKVEr017V2YYDLyn1xF_00ofptWbkg%40mail.gmail.com
* Make binaryheap enlargeable.Masahiko Sawada2024-04-03
| | | | | | | | | The node array space of the binaryheap is doubled when there is no available space. Reviewed-by: Vignesh C, Peter Smith, Hayato Kuroda, Ajin Cherian, Tomas Vondra, Shubham Khanna Discussion: https://postgr.es/m/CAD21AoDffo37RC-eUuyHJKVEr017V2YYDLyn1xF_00ofptWbkg%40mail.gmail.com
* Unwind #if spaghetti in hmac_openssl.c a bit.Tom Lane2024-04-02
| | | | | | | | | | | | | | | Make this code a little less confusing by defining a separate macro that controls whether we'll use ResourceOwner facilities to track the existence of a pg_hmac_ctx context. The proximate reason to touch this is that since b8bff07da, we got "unused function" warnings if building with older OpenSSL, because the #if guards around the ResourceOwner wrapper function definitions were different from those around the calls of those functions. Pulling the ResourceOwner machinations outside of the #ifdef HAVE_xxx guards fixes that and makes the code clearer too. Discussion: https://postgr.es/m/1394271.1712016101@sss.pgh.pa.us
* Add unicode_strtitle() for Unicode Default Case Conversion.Jeff Davis2024-03-29
| | | | | | | | | | | | | This brings the titlecasing implementation for the builtin provider out of formatting.c and into unicode_case.c, along with unicode_strlower() and unicode_strupper(). Accepts an arbitrary word boundary callback. Simple for now, but can be extended to support the Unicode Default Case Conversion algorithm with full case mapping. Discussion: https://postgr.es/m/3bc653b5d562ae9e2838b11cb696816c328a489a.camel@j-davis.com Reviewed-by: Peter Eisentraut
* Run perltidy on generate-unicode_version.pl.Jeff Davis2024-03-27
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* Add functions to generate random numbers in a specified range.Dean Rasheed2024-03-27
| | | | | | | | | | | | | | | | | | | | | | | | This adds 3 new variants of the random() function: random(min integer, max integer) returns integer random(min bigint, max bigint) returns bigint random(min numeric, max numeric) returns numeric Each returns a random number x in the range min <= x <= max. For the numeric function, the number of digits after the decimal point is equal to the number of digits that "min" or "max" has after the decimal point, whichever has more. The main entry points for these functions are in a new C source file. The existing random(), random_normal(), and setseed() functions are moved there too, so that they can all share the same PRNG state, which is kept private to that file. Dean Rasheed, reviewed by Jian He, David Zhang, Aleksander Alekseev, and Tomas Vondra. Discussion: https://postgr.es/m/CAEZATCV89Vxuq93xQdmc0t-0Y2zeeNQTdsjbmV7dyFBPykbV4Q@mail.gmail.com