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* Ensure that a tsquery like '!foo' matches empty tsvectors.Tom Lane2017-01-26
| | | | | | | | | | | | | | | | | !foo means "the tsvector does not contain foo", and therefore it should match an empty tsvector. ts_match_vq() overenthusiastically supposed that an empty tsvector could never match any query, so it forcibly returned FALSE, the wrong answer. Remove the premature optimization. Our behavior on this point was inconsistent, because while seqscans and GIST index searches both failed to match empty tsvectors, GIN index searches would find them, since GIN scans don't rely on ts_match_vq(). That makes this certainly a bug, not a debatable definition disagreement, so back-patch to all supported branches. Report and diagnosis by Tom Dunstan (bug #14515); added test cases by me. Discussion: https://postgr.es/m/20170126025524.1434.97828@wrigleys.postgresql.org
* Fix typo: pg_statistics -> pg_statisticPeter Eisentraut2017-01-25
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* Introduce convenience macros to hide JsonbContainer header accesses better.Tom Lane2017-01-25
| | | | | | | | | | | | This improves readability a bit and may make future improvements easier. In passing, make sure that the JB_ROOT_IS_XXX macros deliver boolean (0/1) results; the previous coding was a bug hazard, though no actual bugs are known. Nikita Glukhov, extended a bit by me Discussion: https://postgr.es/m/9e21a39c-c1d7-b9b5-44a0-c5345a5029f6@postgrespro.ru
* Update copyright years in some recently added filesPeter Eisentraut2017-01-25
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* Close replication connection when slot creation errorsPeter Eisentraut2017-01-25
| | | | From: Petr Jelinek <pjmodos@pjmodos.net>
* Remove vestigial resolveUnknown arguments from transformSortClause etc.Tom Lane2017-01-25
| | | | | | | | | There's really no situation where we don't want these unknown-to-text conversions to happen. The alternative is failure anyway, and the one caller that was passing "false" did so only because it expected the case could not arise. Might as well simplify the code. Discussion: https://postgr.es/m/CAH2L28uwwbL9HUM-WR=hromW1Cvamkn7O-g8fPY2m=_7muJ0oA@mail.gmail.com
* Make UNKNOWN into an actual pseudo-type.Tom Lane2017-01-25
| | | | | | | | | | | | Previously, type "unknown" was labeled as a base type in pg_type, which perhaps had some sense to it because you were allowed to create tables with unknown-type columns. But now that we don't allow that, it makes more sense to label it a pseudo-type. This has the additional effects of forbidding use of "unknown" as a domain base type, cast source or target type, PL function argument or result type, or plpgsql local variable type; all of which seem like good holes to plug. Discussion: https://postgr.es/m/CAH2L28uwwbL9HUM-WR=hromW1Cvamkn7O-g8fPY2m=_7muJ0oA@mail.gmail.com
* Change unknown-type literals to type text in SELECT and RETURNING lists.Tom Lane2017-01-25
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Previously, we left such literals alone if the query or subquery had no properties forcing a type decision to be made (such as an ORDER BY or DISTINCT clause using that output column). This meant that "unknown" could be an exposed output column type, which has never been a great idea because it could result in strange failures later on. For example, an outer query that tried to do any operations on an unknown-type subquery output would generally fail with some weird error like "failed to find conversion function from unknown to text" or "could not determine which collation to use for string comparison". Also, if the case occurred in a CREATE VIEW's query then the view would have an unknown-type column, causing similar failures in queries trying to use the view. To fix, at the tail end of parse analysis of a query, forcibly convert any remaining "unknown" literals in its SELECT or RETURNING list to type text. However, provide a switch to suppress that, and use it in the cases of SELECT inside a set operation or INSERT command. In those cases we already had type resolution rules that make use of context information from outside the subquery proper, and we don't want to change that behavior. Also, change creation of an unknown-type column in a relation from a warning to a hard error. The error should be unreachable now in CREATE VIEW or CREATE MATVIEW, but it's still possible to explicitly say "unknown" in CREATE TABLE or CREATE (composite) TYPE. We want to forbid that because it's nothing but a foot-gun. This change creates a pg_upgrade failure case: a matview that contains an unknown-type column can't be pg_upgraded, because reparsing the matview's defining query will now decide that the column is of type text, which doesn't match the cstring-like storage that the old materialized column would actually have. Add a checking pass to detect that. While at it, we can detect tables or composite types that would fail, essentially for free. Those would fail safely anyway later on, but we might as well fail earlier. This patch is by me, but it owes something to previous investigations by Rahila Syed. Also thanks to Ashutosh Bapat and Michael Paquier for review. Discussion: https://postgr.es/m/CAH2L28uwwbL9HUM-WR=hromW1Cvamkn7O-g8fPY2m=_7muJ0oA@mail.gmail.com
* Be more aggressive in avoiding tuple conversion.Robert Haas2017-01-24
| | | | | | | | | | | | | | | | | | | | | | According to the comments in tupconvert.c, it's necessary to perform tuple conversion when either table has OIDs, and this was previously checked by ensuring that the tdtypeid value matched between the tables in question. However, that's overly stringent: we have access to tdhasoid and can test directly whether OIDs are present, which lets us avoid conversion in cases where the type OIDs are different but the tuple descriptors are entirely the same (and neither has OIDs). This is useful to the partitioning code, which can thereby avoid converting tuples when inserting into a partition whose columns appear in the same order as the parent columns, the normal case. It's possible for the tuple routing code to avoid some additional overhead in this case as well, so do that, too. It's not clear whether it would be OK to skip this when both tables have OIDs: do callers count on this to build a new tuple (losing the previous OID) in such instances? Until we figure it out, leave the behavior in that case alone. Amit Langote, reviewed by me.
* Add a SHOW command to the replication command language.Robert Haas2017-01-24
| | | | | | | | | | | | | | This is useful infrastructure for an upcoming proposed patch to allow the WAL segment size to be changed at initdb time; tools like pg_basebackup need the ability to interrogate the server setting. But it also doesn't seem like a bad thing to have independently of that; it may find other uses in the future. Robert Haas and Beena Emerson. (The original patch here was by Beena, but I rewrote it to such a degree that most of the code being committed here is mine.) Discussion: http://postgr.es/m/CA+TgmobNo4qz06wHEmy9DszAre3dYx-WNhHSCbU9SAwf+9Ft6g@mail.gmail.com
* Add a new DestReceiver for printing tuples without catalog access.Robert Haas2017-01-24
| | | | | | | | | | | | | | | If you create a DestReciver of type DestRemote and try to use it from a replication connection that is not bound to a specific daabase, or any other hypothetical type of backend that is not bound to a specific database, it will fail because it doesn't have a pg_proc catalog to look up properties of the types being printed. In general, that's an unavoidable problem, but we can hardwire the properties of a few builtin types in order to support utility commands. This new DestReceiver of type DestRemoteSimple does just that. Patch by me, reviewed by Michael Paquier. Discussion: http://postgr.es/m/CA+TgmobNo4qz06wHEmy9DszAre3dYx-WNhHSCbU9SAwf+9Ft6g@mail.gmail.com
* Extend index AM API for parallel index scans.Robert Haas2017-01-24
| | | | | | | This patch doesn't actually make any index AM parallel-aware, but it provides the necessary functions at the AM layer to do so. Rahila Syed, Amit Kapila, Robert Haas
* Fix things so that updatable views work with partitioned tables.Robert Haas2017-01-24
| | | | | | | | Previously, ExecInitModifyTable was missing handling for WITH CHECK OPTION, and view_query_is_auto_updatable was missing handling for RELKIND_PARTITIONED_TABLE. Amit Langote, reviewed by me.
* Set ecxt_scantuple correctly for tuple routing.Robert Haas2017-01-24
| | | | | | | | | | | | In 2ac3ef7a01df859c62d0a02333b646d65eaec5ff, we changed things so that it's possible for a different TupleTableSlot to be used for partitioned tables at successively lower levels. If we do end up changing the slot from the original, we must update ecxt_scantuple to point to the new one for partition key of the tuple to be computed correctly. Reported by Rajkumar Raghuwanshi. Patch by Amit Langote. Discussion: http://postgr.es/m/CAKcux6%3Dm1qyqB2k6cjniuMMrYXb75O-MB4qGQMu8zg-iGGLjDw%40mail.gmail.com
* Reindent table partitioning code.Robert Haas2017-01-24
| | | | | | We've accumulated quite a bit of stuff with which pgindent is not quite happy in this code; clean it up to provide a less-annoying base for future pgindent runs.
* Remove unused variable.Robert Haas2017-01-24
| | | | | This was intended to be included in the previous commit, but I goofed.
* Don't invoke arbitrary code inside a possibly-aborted transaction.Robert Haas2017-01-24
| | | | | | | | The code here previously tried to call the partitioning operator, but really the right thing to do (and the safe thing to do) is use datumIsEqual(). Amit Langote, but I expanded the comment and fixed a compiler warning.
* Fix interaction of partitioned tables with BulkInsertState.Robert Haas2017-01-24
| | | | | | | | | | | | | | | | | | | | When copying into a partitioned table, the target heap may change from one tuple to next. We must ask ReadBufferBI() to get a new buffer every time such change occurs. To do that, use new function ReleaseBulkInsertStatePin(). This fixes the bug that tuples ended up being inserted into the wrong partition, which occurred exactly because the wrong buffer was used. Amit Langote, per a suggestion from Robert Haas. Some cosmetic adjustments by me. Reports by 高增琦 (Gao Zengqi), Venkata B Nagothi, and Ragnar Ouchterlony. Discussion: http://postgr.es/m/CAFmBtr32FDOqofo8yG-4mjzL1HnYHxXK5S9OGFJ%3D%3DcJpgEW4vA%40mail.gmail.com Discussion: http://postgr.es/m/CAEyp7J9WiX0L3DoiNcRrY-9iyw%3DqP%2Bj%3DDLsAnNFF1xT2J1ggfQ%40mail.gmail.com Discussion: http://postgr.es/m/16d73804-c9cd-14c5-463e-5caad563ff77%40agama.tv Discussion: http://postgr.es/m/CA+TgmoaiZpDVUUN8LZ4jv1qFE_QyR+H9ec+79f5vNczYarg5Zg@mail.gmail.com
* Be sure to release the lock on failure to launch logical replication worker.Fujii Masao2017-01-24
| | | | Petr Jelinek
* Fix comments in StrategyNotifyBgWriter().Tatsuo Ishii2017-01-24
| | | | | | | | The interface for the function was changed in d72731a70450b5e7084991b9caa15cb58a2820df but the comments of the function was not updated. Patch by Yugo Nagata.
* Fix parallel make issue with new fmgrprotos.hPeter Eisentraut2017-01-23
| | | | | | | The make rules needed further refinement so that we don't run multiple generations per build. reported by Tom Lane
* Fix default minimum value for descending sequencesPeter Eisentraut2017-01-23
| | | | | | | | | | | For some reason that is lost in history, a descending sequence would default its minimum value to -2^63+1 (-PG_INT64_MAX) instead of -2^63 (PG_INT64_MIN), even though explicitly specifying a minimum value of -2^63 would work. Fix this inconsistency by using the full range by default. Reported-by: Daniel Verite <daniel@manitou-mail.org> Reviewed-by: Michael Paquier <michael.paquier@gmail.com>
* Don't error when no system locales were foundPeter Eisentraut2017-01-23
| | | | | | initdb used to warn about that, but it was changed to an error in pg_import_system_locales, but some build farm members failed because of that. Change it back to a warning.
* Fix NULL pointer access in logical replication workersPeter Eisentraut2017-01-23
| | | | From: Petr Jelinek <pjmodos@pjmodos.net>
* Fix pointer confusionPeter Eisentraut2017-01-23
| | | | | | get_object_address_publication_rel() needed to check *relation, not relation. Rename the variables to match style used nearby to avoid the confusion.
* Fix memory leaks in libpqwalreceiverPeter Eisentraut2017-01-23
| | | | | | The results of the libpq functions PQescapeIdentifier() and PQescapeLiteral() must be freed explicitly. Also handle errors in these functions better.
* Prefetch blocks during lazy vacuum's truncation scanAlvaro Herrera2017-01-23
| | | | | | | | | | | | | | Vacuum truncation scan can be sped up on rotating media by prefetching blocks in forward direction. That makes the blocks already present in memory by the time they are needed, while also letting OS read-ahead kick in. The truncate scan has been measured to be five times faster than without this patch (that was on a slow disk, but it shouldn't hurt on fast disks.) Author: Álvaro Herrera, loosely based on a submission by Claudio Freire Discussion: https://postgr.es/m/CAGTBQpa6NFGO_6g_y_7zQx8L9GcHDSQKYdo1tGuh791z6PYgEg@mail.gmail.com
* Fix example plan in optimizer/README.Tom Lane2017-01-23
| | | | | | | | | | | Joining three tables only takes two join nodes. I think when I (tgl) wrote this, I was envisioning possible additional joins; but since the example doesn't show any fourth table, it's just confusing to write a third join node. Etsuro Fujita Discussion: https://postgr.es/m/e6cfbaa3-af02-1abc-c25e-8fa5c6bc4e21@lab.ntt.co.jp
* Relocate static function declarations to be after typedefs in jsonfuncs.c.Tom Lane2017-01-22
| | | | | | | | | | | | Project style is to put things in this order, for the good and sufficient reason that you often need the typedefs in the function declarations. There already was one function declaration that needed a typedef, which was randomly placed away from all the other static function declarations in consequence. And the submitted patch for better json_populate_record functionality jumped through even more hoops in order to preserve this bad idea. This patch only moves lines from point A to point B, no other changes.
* Remove no-longer-needed loop in ExecGather().Tom Lane2017-01-22
| | | | | | | | | Coverity complained quite properly that commit ea15e1867 had introduced unreachable code into ExecGather(); to wit, it was no longer possible to iterate the final for-loop more or less than once. So remove the for(). In passing, clean up a couple of comments, and make better use of a local variable.
* Add missing breakPeter Eisentraut2017-01-22
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* Move some things from builtins.h to new header filesPeter Eisentraut2017-01-20
| | | | This avoids that builtins.h has to include additional header files.
* Avoid useless respawining the autovacuum launcher at high speed.Robert Haas2017-01-20
| | | | | | | | | | | | | | | | | | | | | | When (1) autovacuum = off and (2) there's at least one database with an XID age greater than autovacuum_freeze_max_age and (3) all tables in that database that need vacuuming are already being processed by a worker and (4) the autovacuum launcher is started, a kind of infinite loop occurs. The launcher starts a worker and immediately exits. The worker, finding no worker to do, immediately starts the launcher, supposedly so that the next database can be processed. But because datfrozenxid for that database hasn't been advanced yet, the new worker gets put right back into the same database as the old one, where it once again starts the launcher and exits. High-speed ping pong ensues. There are several possible ways to break the cycle; this seems like the safest one. Amit Khandekar (code) and Robert Haas (comments), reviewed by Álvaro Herrera. Discussion: http://postgr.es/m/CAJ3gD9eWejf72HKquKSzax0r+epS=nAbQKNnykkMA0E8c+rMDg@mail.gmail.com
* Fix comparison logic in partition_bounds_equal for non-finite bounds.Robert Haas2017-01-20
| | | | | | | | If either bound is infinite, then we shouldn't even try to perform a comparison of the values themselves. Rearrange the logic so that we don't. Per buildfarm member skink and Tom Lane.
* Record dependencies on owners for logical replication objectsAlvaro Herrera2017-01-20
| | | | | | | | | This was forgotten in 665d1fad99e7b11678b0d5fa24d2898424243cd6 and caused the whole buildfarm to become red for a little while. Author: Petr Jelínek Also fix a typo in a nearby error message.
* Try to fix non-MSVC Windows builds in the wake of logical replication.Tom Lane2017-01-20
| | | | | | | | | | | | | | pgoutput evidently needs to be built without -DBUILDING_DLL. (It seems like a pretty bad idea that these makefiles need to know exactly where all the shlibs are in the tree, or maybe what's bad is putting them under src/backend/. But right now is not the time to redesign that.) Also, remove "override CPPFLAGS" in pgoutput's Makefile. I don't think that that actually has any bad consequences, but it's certainly useless in a directory that has no .h files, and it might be contributing to the failure somehow. Per buildfarm.
* Logical replicationPeter Eisentraut2017-01-20
| | | | | | | | | | | | | - Add PUBLICATION catalogs and DDL - Add SUBSCRIPTION catalog and DDL - Define logical replication protocol and output plugin - Add logical replication workers From: Petr Jelinek <petr@2ndquadrant.com> Reviewed-by: Steve Singer <steve@ssinger.info> Reviewed-by: Andres Freund <andres@anarazel.de> Reviewed-by: Erik Rijkers <er@xs4all.nl> Reviewed-by: Peter Eisentraut <peter.eisentraut@2ndquadrant.com>
* Avoid core dump for empty prepared statement in an aborted transaction.Tom Lane2017-01-19
| | | | | | | | | | | | Brown-paper-bag bug in commit ab1f0c822: the old code here coped with null CachedPlanSource.raw_parse_tree, the new code not so much. Per report from Dave Cramer. No regression test, because our core testing infrastructure doesn't provide any easy way to exercise this path. Fortunately, the JDBC crew test it regularly. Discussion: https://postgr.es/m/CADK3HH+Ug3xCysKqw_dZOnaNnytZ1Rh5yP05hjO-e4NoyRxVvA@mail.gmail.com
* Fix Assert failure induced by commit 215b43cdc.Tom Lane2017-01-19
| | | | | | | | | | | | I'd somehow talked myself into believing that set_append_rel_size doesn't need to worry about getting back an AND clause when it applies eval_const_expressions to the result of adjust_appendrel_attrs (that is, transposing the appendrel parent's restriction clauses for one child). But that is nonsense, and Andreas Seltenreich's fuzz tester soon turned up a counterexample. Put back the make_ands_implicit step that was there before, and add a regression test covering the case. Report: https://postgr.es/m/878tq6vja6.fsf@ansel.ydns.eu
* Remove obsoleted code relating to targetlist SRF evaluation.Andres Freund2017-01-19
| | | | | | | | | | | | | Since 69f4b9c plain expression evaluation (and thus normal projection) can't return sets of tuples anymore. Thus remove code dealing with that possibility. This will require adjustments in external code using ExecEvalExpr()/ExecProject() - that should neither be hard nor very common. Author: Andres Freund and Tom Lane Discussion: https://postgr.es/m/20160822214023.aaxz5l4igypowyri@alap3.anarazel.de
* Fix race condition in reading commit timestampsAlvaro Herrera2017-01-19
| | | | | | | | | | | | | | | | | | | | | | | | | If a user requests the commit timestamp for a transaction old enough that its data is concurrently being truncated away by vacuum at just the right time, they would receive an ugly internal file-not-found error message from slru.c rather than the expected NULL return value. In a primary server, the window for the race is very small: the lookup has to occur exactly between the two calls by vacuum, and there's not a lot that happens between them (mostly just a multixact truncate). In a standby server, however, the window is larger because the truncation is executed as soon as the WAL record for it is replayed, but the advance of the oldest-Xid is not executed until the next checkpoint record. To fix in the primary, simply reverse the order of operations in vac_truncate_clog. To fix in the standby, augment the WAL truncation record so that the standby is aware of the new oldest-XID value and can apply the update immediately. WAL version bumped because of this. No backpatch, because of the low importance of the bug and its rarity. Author: Craig Ringer Reviewed-By: Petr Jelínek, Peter Eisentraut Discussion: https://postgr.es/m/CAMsr+YFhVtRQT1VAwC+WGbbxZZRzNou=N9Ed-FrCqkwQ8H8oJQ@mail.gmail.com
* Avoid some code duplication in map_partition_varattnos().Robert Haas2017-01-19
| | | | | | | | | Code to map attribute numbers in map_partition_varattnos() duplicates what convert_tuples_by_name_map() does. Avoid that. Amit Langote, per a report from Álvaro Herrera. Discussion: http://postgr.es/m/9ce97382-54c8-deb3-9ee9-a2ec271d866b%40lab.ntt.co.jp
* Fix some problems in check_new_partition_bound().Robert Haas2017-01-19
| | | | | | | | | | | | | | | | Account for the fact that the highest bound less than or equal to the upper bound might be either the lower or the upper bound of the overlapping partition, depending on whether the proposed partition completely contains the existing partition or merely overlaps it. Also, we need not continue searching for even greater bound in partition_bound_bsearch() once we find the first bound that is *equal* to the probe, because we don't have duplicate datums. That spends cycles needlessly. Amit Langote, per a report from Amul Sul. Cosmetic changes by me. Discussion: http://postgr.es/m/CAAJ_b94XgbqVoXMyxxs63CaqWoMS1o2gpHiU0F7yGnJBnvDc_A%40mail.gmail.com
* Fix RETURNING to work correctly with partition tuple routing.Robert Haas2017-01-19
| | | | | | | | | | In ExecInsert(), do not switch back to the root partitioned table ResultRelInfo until after we finish ExecProcessReturning(), so that RETURNING projection is done using the partition's descriptor. For the projection to work correctly, we must initialize the same for each leaf partition during ModifyTableState initialization. Amit Langote
* Fix failure to enforce partitioning contraint for internal partitions.Robert Haas2017-01-19
| | | | | | | | | | | | | When a tuple is inherited into a partitioning root, no partition constraints need to be enforced; when it is inserted into a leaf, the parent's partitioning quals needed to be enforced. The previous coding got both of those cases right. When a tuple is inserted into an intermediate level of the partitioning hierarchy (i.e. a table which is both a partition itself and in turn partitioned), it must enforce the partitioning qual inherited from its parent. That case got overlooked; repair. Amit Langote
* Allow negative years in make_date to represent BC yearsAlvaro Herrera2017-01-19
| | | | | | | | | | There doesn't seem to be any reason not to allow negative years to be interpreted as BC, so do that. The documentation is pretty vague on the details of this function, so nothing needs to change there. Reported-by: Andy Abelisto, in bug #14446
* Move targetlist SRF handling from expression evaluation to new executor node.Andres Freund2017-01-18
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Evaluation of set returning functions (SRFs_ in the targetlist (like SELECT generate_series(1,5)) so far was done in the expression evaluation (i.e. ExecEvalExpr()) and projection (i.e. ExecProject/ExecTargetList) code. This meant that most executor nodes performing projection, and most expression evaluation functions, had to deal with the possibility that an evaluated expression could return a set of return values. That's bad because it leads to repeated code in a lot of places. It also, and that's my (Andres's) motivation, made it a lot harder to implement a more efficient way of doing expression evaluation. To fix this, introduce a new executor node (ProjectSet) that can evaluate targetlists containing one or more SRFs. To avoid the complexity of the old way of handling nested expressions returning sets (e.g. having to pass up ExprDoneCond, and dealing with arguments to functions returning sets etc.), those SRFs can only be at the top level of the node's targetlist. The planner makes sure (via split_pathtarget_at_srfs()) that SRF evaluation is only necessary in ProjectSet nodes and that SRFs are only present at the top level of the node's targetlist. If there are nested SRFs the planner creates multiple stacked ProjectSet nodes. The ProjectSet nodes always get input from an underlying node. We also discussed and prototyped evaluating targetlist SRFs using ROWS FROM(), but that turned out to be more complicated than we'd hoped. While moving SRF evaluation to ProjectSet would allow to retain the old "least common multiple" behavior when multiple SRFs are present in one targetlist (i.e. continue returning rows until all SRFs are at the end of their input at the same time), we decided to instead only return rows till all SRFs are exhausted, returning NULL for already exhausted ones. We deemed the previous behavior to be too confusing, unexpected and actually not particularly useful. As a side effect, the previously prohibited case of multiple set returning arguments to a function, is now allowed. Not because it's particularly desirable, but because it ends up working and there seems to be no argument for adding code to prohibit it. Currently the behavior for COALESCE and CASE containing SRFs has changed, returning multiple rows from the expression, even when the SRF containing "arm" of the expression is not evaluated. That's because the SRFs are evaluated in a separate ProjectSet node. As that's quite confusing, we're likely to instead prohibit SRFs in those places. But that's still being discussed, and the code would reside in places not touched here, so that's a task for later. There's a lot of, now superfluous, code dealing with set return expressions around. But as the changes to get rid of those are verbose largely boring, it seems better for readability to keep the cleanup as a separate commit. Author: Tom Lane and Andres Freund Discussion: https://postgr.es/m/20160822214023.aaxz5l4igypowyri@alap3.anarazel.de
* Improve comment in hashsearch.c.Robert Haas2017-01-18
| | | | Typo fix from Mithun Cy; other improvements by me.
* Implement array version of jsonb_delete and operatorMagnus Hagander2017-01-18
| | | | | | | | | This makes it possible to delete multiple keys from a jsonb value by passing in an array of text values, which makes the operaiton much faster than individually deleting the keys (which would require copying the jsonb structure over and over again. Reviewed by Dmitry Dolgov and Michael Paquier
* Disable transforms that replaced AT TIME ZONE with RelabelType.Tom Lane2017-01-18
| | | | | | | | | | | | | | | | | | These resulted in wrong answers if the relabeled argument could be matched to an index column, as shown in bug #14504 from Evgeniy Kozlov. We might be able to resurrect these optimizations by adjusting the planner's treatment of RelabelType, or by adjusting btree's rules for selecting comparison functions, but either solution will take careful analysis and does not sound like a fit candidate for backpatching. I left the catalog infrastructure in place and just reduced the transform functions to always-return-NULL. This would be necessary anyway in the back branches, and it doesn't seem important to be more invasive in HEAD. Bug introduced by commit b8a18ad48. Back-patch to 9.5 where that came in. Report: https://postgr.es/m/20170118144828.1432.52823@wrigleys.postgresql.org Discussion: https://postgr.es/m/18771.1484759439@sss.pgh.pa.us
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