These commands already make the persistence of owned sequences follow
owned table persistence changes. They didn't lock those sequences.
They lost the effect of nextval() calls that other sessions make after
the ALTER TABLE command, before the ALTER TABLE transaction commits.
Fix by acquiring the same lock that ALTER SEQUENCE SET { LOGGED |
UNLOGGED } acquires. This might cause more deadlocks. Back-patch to
v15, where commit 344d62fb9a introduced
unlogged sequences.
Reviewed (in an earlier version) by Robert Haas.
Discussion: https://postgr.es/m/20240611024525.9f.nmisch@google.com
afterTriggerInvokeEvents and AfterTriggerExecute have always
treated it as an error if the trigger OID mentioned in a queued
after-trigger event can't be found. However, that fails to
account for the edge case where the trigger's been dropped in
the current transaction since queueing the event. There seems
no very good reason to disallow that case, so instead silently
do nothing if the trigger OID can't be found.
This does give up a little bit of bug-detection ability, but I don't
recall that these error messages have ever actually revealed a bug,
so it seems mostly theoretical. Alternatives such as marking
pending events DONE at the time of dropping a trigger would be
complicated and perhaps introduce bugs of their own.
Per bug #18517 from Alexander Lakhin. Back-patch to all
supported branches.
Discussion: https://postgr.es/m/18517-af2d19882240902c@postgresql.org
Make sure that function declarations use names that exactly match the
corresponding names from function definitions in a few places. These
inconsistencies were all introduced during Postgres 17 development.
pg_bsd_indent still has a couple of similar inconsistencies, which I
(pgeoghegan) have left untouched for now.
This commit was written with help from clang-tidy, by mechanically
applying the same rules as similar clean-up commits (the earliest such
commit was commit 035ce1fe).
Normally this case isn't even reachable by non-superusers, since
permissions checks prevent naming such a table. However, it is
possible to make it happen by altering a parent table whose child
is another session's temp table.
We definitely can't support any such ALTER that requires modifying
the contents of such a table, since we lack access to the other
session's temporary-buffer pool. But there seems no good reason
to allow it even if it'd only require changing catalog contents.
One reason not to allow it is that we'd rather not expose the
implementation-dependent behavior of whether a specific ALTER
requires touching the table contents. Another is that there may
be (in future, even if not today) optimizations that assume that
a session's own temp tables won't be modified by other sessions.
Hence, add a RELATION_IS_OTHER_TEMP() check to all the places
where ALTER TABLE currently does CheckTableNotInUse(). (I looked
through all other callers of CheckTableNotInUse(), and they seem
OK already.)
Per bug #18492 from Alexander Lakhin. Back-patch to all supported
branches.
Discussion: https://postgr.es/m/18492-c7a2634bf4968763@postgresql.org
When MERGE/SPLIT created new partitions, it was cloning the extended
statistics of the parent table.
However, extended stats on partitioned tables don't behave like
indexes on partitioned tables (which exist only to create physical
indexes on child tables). Rather, extended stats on a parent 1) cause
extended stats to be collected and computed across the whole partition
hierarchy, and 2) do not cause extended stats to be computed for the
individual partitions.
"CREATE TABLE ... PARTITION OF" command doesn't copy extended
statistics. This commit makes createPartitionTable() behave
consistently.
Reported-by: Justin Pryzby
Discussion: https://postgr.es/m/ZiJW1g2nbQs9ekwK%40pryzbyj2023
Author: Alexander Korotkov, Justin Pryzby
Both MERGE and SPLIT partition operations support the case when the name of the
new partition matches the name of the existing partition to be merged/split.
But the name collision detection doesn't always work as intended. The SPLIT
partition operation finds the namespace to search for an existing partition
without taking into account the parent's persistence. The MERGE partition
operation checks for the name collision with simple equal() on RangeVar's
simply ignoring the search_path.
This commit fixes this behavior as follows.
1. The SPLIT partition operation now finds the namespace to search for
an existing partition according to the parent's persistence.
2. The MERGE partition operation now checks for the name collision similarly
to the SPLIT partition operation using
RangeVarGetAndCheckCreationNamespace() and get_relname_relid().
Reported-by: Alexander Lakhin
Discussion: https://postgr.es/m/86b4f1e3-0b5d-315c-9225-19860d64d685%40gmail.com
Author: Dmitry Koval, Alexander Korotkov
After further review, we want to move in the direction of always
quoting GUC names in error messages, rather than the previous (PG16)
wildly mixed practice or the intermittent (mid-PG17) idea of doing
this depending on how possibly confusing the GUC name is.
This commit applies appropriate quotes to (almost?) all mentions of
GUC names in error messages. It partially supersedes a243569bf6 and
8d9978a717, which had moved things a bit in the opposite direction
but which then were abandoned in a partial state.
Author: Peter Smith <smithpb2250@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/CAHut%2BPv-kSN8SkxSdoHano_wPubqcg5789ejhCDZAcLFceBR-w%40mail.gmail.com
There were a few typedefs that were never used to define a variable or
field. This had the effect that the buildfarm's typedefs.list would
not include them, and so they would need to be re-added manually to
keep the overall pgindent result perfectly clean.
We can easily get rid of these typedefs to avoid the issue. In a few
cases, we just let the enum or struct stand on its own without a
typedef around it. In one case, an enum was abused to define flag
bits; that's better done with macro definitions.
This fixes all the remaining issues with missing entries in the
buildfarm's typedefs.list.
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://www.postgresql.org/message-id/1919000.1715815925@sss.pgh.pa.us
This feature set did not handle empty ranges correctly, and it's now
too late for PostgreSQL 17 to fix it.
The following commits are reverted:
6db4598fcb Add stratnum GiST support function
46a0cd4cef Add temporal PRIMARY KEY and UNIQUE constraints
86232a49a4 Fix comment on gist_stratnum_btree
030e10ff1a Rename pg_constraint.conwithoutoverlaps to conperiod
a88c800deb Use daterange and YMD in without_overlaps tests instead of tsrange.
5577a71fb0 Use half-open interval notation in without_overlaps tests
34768ee361 Add temporal FOREIGN KEY contraints
482e108cd3 Add test for REPLICA IDENTITY with a temporal key
c3db1f30cb doc: clarify PERIOD and WITHOUT OVERLAPS in CREATE TABLE
144c2ce0cc Fix ON CONFLICT DO NOTHING/UPDATE for temporal indexes
Discussion: https://www.postgresql.org/message-id/d0b64a7a-dfe4-4b84-a906-c7dedfa40a3e@eisentraut.org
06286709e added a SERIALIZE option to EXPLAIN which included showing the
amount of kilobytes serialized. The calculation to convert bytes into
kilobytes wasn't consistent with how that's done in the rest of EXPLAIN.
Traditionally we round up to the nearest kB, but the new code rounded to
the nearest kB.
To fix this, invent a macro that does the conversion and use that macro
everywhere that requires this conversion.
Additionally, 5de890e36 added EXPLAIN (MEMORY) but included the memory
sizes in bytes. Convert these values to kilobytes to align with the
other memory related outputs.
In passing, swap out a "long" type in show_hash_info() and use a uint64
instead. We do support platforms where sizeof(Size) == 8 and
sizeof(long) == 4, so using a long there is questionable.
Reported-by: jian he
Reviewed-by: jian he
Discussion: https://www.postgresql.org/message-id/CACJufxE4Sp7xvgOwhqtFx5hS85AxMKobPWDo-xZHZVTpK3EBjA@mail.gmail.com
Most of the infrastructure for procedure arguments was already
okay with polymorphic output arguments, but it turns out that
CallStmtResultDesc() was a few bricks shy of a load here. It thought
all it needed to do was call build_function_result_tupdesc_t, but
that function specifically disclaims responsibility for resolving
polymorphic arguments. Failing to handle that doesn't seem to be
a problem for CALL in plpgsql, but CALL from plain SQL would get
errors like "cannot display a value of type anyelement", or even
crash outright.
In v14 and later we can simply examine the exposed types of the
CallStmt.outargs nodes to get the right type OIDs. But it's a lot
more complicated to fix in v12/v13, because those versions don't
have CallStmt.outargs, nor do they do expand_function_arguments
until ExecuteCallStmt runs. We have to duplicatively run
expand_function_arguments, and then re-determine which elements
of the args list are output arguments.
Per bug #18463 from Drew Kimball. Back-patch to all supported
versions, since it's busted in all of them.
Discussion: https://postgr.es/m/18463-f8cd77e12564d8a2@postgresql.org
Presently, when this function is called for an unlogged sequence on
a standby server, it will error out with a message like
ERROR: could not open file "base/5/16388": No such file or directory
Since the pg_sequences system view uses pg_sequence_last_value(),
it can error similarly. To fix, modify the function to return NULL
for unlogged sequences on standby servers. Since this bug is
present on all versions since v15, this approach is preferable to
making the ERROR nicer because we need to repair the pg_sequences
view without modifying its definition on released versions. For
consistency, this commit also modifies the function to return NULL
for other sessions' temporary sequences. The pg_sequences view
already appropriately filters out such sequences, so there's no bug
there, but we might as well offer some defense in case someone
invokes this function directly.
Unlogged sequences were first introduced in v15, but temporary
sequences are much older, so while the fix for unlogged sequences
is only back-patched to v15, the temporary sequence portion is
back-patched to all supported versions.
We could also remove the privilege check in the pg_sequences view
definition in v18 if we modify this function to return NULL for
sequences for which the current user lacks privileges, but that is
left as a future exercise for when v18 development begins.
Reviewed-by: Tom Lane, Michael Paquier
Discussion: https://postgr.es/m/20240501005730.GA594666%40nathanxps13
Backpatch-through: 12
There are some problems with the new way to handle these constraints
that were detected at the last minute, and require fixes that appear too
invasive to be doing this late in the cycle. Revert this (again) for
now, we'll try again with these problems fixed.
The following commits are reverted:
b0e96f3119 Catalog not-null constraints
9b581c5341 Disallow changing NO INHERIT status of a not-null constraint
d0ec2ddbe0 Fix not-null constraint test
ac22a9545c Move privilege check to the right place
b0f7dd915b Check stack depth in new recursive functions
3af7217942 Update information_schema definition for not-null constraints
c3709100be Fix propagating attnotnull in multiple inheritance
d9f686a72e Fix restore of not-null constraints with inheritance
d72d32f52d Don't try to assign smart names to constraints
0cd711271d Better handle indirect constraint drops
13daa33fa5 Disallow NO INHERIT not-null constraints on partitioned tables
d45597f72f Disallow direct change of NO INHERIT of not-null constraints
21ac38f498 Fix inconsistencies in error messages
Discussion: https://postgr.es/m/202405110940.joxlqcx4dogd@alvherre.pgsql
It turns out that we broke this in commit e5bc9454e, because
the code was assuming that no dependent types would appear
among the extension's direct dependencies, and now they do.
This isn't terribly hard to fix: just skip dependent types,
expecting that we will recurse to them when we process the parent
object (which should also be among the direct dependencies).
But a little bit of refactoring is needed so that we can avoid
duplicating logic about what is a dependent type.
Although there is some testing of ALTER EXTENSION SET SCHEMA,
it failed to cover interesting cases, so add more tests.
Discussion: https://postgr.es/m/930191.1715205151@sss.pgh.pa.us
When changing the data type of a column of a partitioned table, craft
the ALTER SEQUENCE command only once. Partitions do not have identity
sequences of their own and thus do not need a ALTER SEQUENCE command
for each partition.
Fix getIdentitySequence() to fetch the identity sequence associated
with the top-level partitioned table when a Relation of a partition is
passed to it. While doing so, translate the attribute number of the
partition into the attribute number of the partitioned table.
Author: Ashutosh Bapat <ashutosh.bapat@enterprisedb.com>
Reported-by: Alexander Lakhin <exclusion@gmail.com>
Reviewed-by: Dmitry Dolgov <9erthalion6@gmail.com>
Discussion: https://www.postgresql.org/message-id/3b8a9dc1-bbc7-0ef5-6863-c432afac7d59@gmail.com
While converting a pg_attribute tuple into a ColumnDef,
ColumnDef::compression remains NULL if there is no compression method
set fot the attribute. Calling strcmp() with NULL
ColumnDef::compression, when comparing compression methods of parents,
causes segmentation fault in MergeInheritedAttribute(). Skip
comparing compression methods if either of them is NULL.
Author: Ashutosh Bapat <ashutosh.bapat@enterprisedb.com>
Reported-by: Alexander Lakhin <exclusion@gmail.com>
Discussion: https://www.postgresql.org/message-id/b22a6834-aacb-7b18-0424-a3f5fe889667%40gmail.com
We support changing NO INHERIT constraint to INHERIT for constraints in
child relations when adding a constraint to some ancestor relation, and
also during pg_upgrade's schema restore; but other than those special
cases, command ALTER TABLE ADD CONSTRAINT should not be allowed to
change an existing constraint from NO INHERIT to INHERIT, as that would
require to process child relations so that they also acquire an
appropriate constraint, which we may not be in a position to do. (It'd
also be surprising behavior.)
It is conceivable that we want to allow ALTER TABLE SET NOT NULL to make
such a change; but in that case some more code is needed to implement it
correctly, so for now I've made that throw the same error message.
Also, during the prep phase of ALTER TABLE ADD CONSTRAINT, acquire locks
on all descendant tables; otherwise we might operate on child tables on
which no locks are held, particularly in the mode where a primary key
causes not-null constraints to be created on children.
Reported-by: Alexander Lakhin <exclusion@gmail.com>
Discussion: https://postgr.es/m/7d923a66-55f0-3395-cd40-81c142b5448b@gmail.com
This commit makes new partitions created by ALTER TABLE ... SPLIT PARTITION
and ALTER TABLE ... MERGE PARTITIONS commands inherit the paret table access
method.
Reported-by: Alexander Lakhin
Discussion: https://postgr.es/m/84ada05b-be5c-473e-6d1c-ebe5dd21b190%40gmail.com
Reviewed-by: Pavel Borisov
The createPartitionTable() function is responsible for creating new partitions
for ALTER TABLE ... MERGE PARTITIONS, and ALTER TABLE ... SPLIT PARTITION
commands. It emulates the behaviour of CREATE TABLE ... (LIKE ...), where
new table persistence should be specified by the user. In the table
partitioning persistent of the partition and its parent must match. So, this
commit makes createPartitionTable() copy the persistence of the parent
partition.
Also, this commit makes createPartitionTable() recheck the persistence after
the new table creation. This is needed because persistence might be affected
by pg_temp in search_path.
This commit also changes the signature of createPartitionTable() making it
take the parent's Relation itself instead of the name of the parent relation,
and return the Relation of new partition. That doesn't lead to
complications, because both callers have the parent table open and need to
open the new partition.
Reported-by: Alexander Lakhin
Discussion: https://postgr.es/m/dbc8b96c-3cf0-d1ee-860d-0e491da20485%40gmail.com
Author: Dmitry Koval
Reviewed-by: Alexander Korotkov, Robert Haas, Justin Pryzby, Pavel Borisov
The name collision happens when the name of the new partition is the same as
the name of one of the merging partitions. Currently, ATExecMergePartitions()
first gives the new partition a temporary name and then renames it when old
partitions are deleted. That negatively influences the naming of related
objects like indexes and constrains, which could inherit a temporary name.
This commit changes the implementation in the following way. A merging
partition gets renamed first, then the new partition is created with the
right name immediately. This resolves the issue of the naming of related
objects.
Reported-by: Alexander Lakhin
Discussion: https://postgr.es/m/edfbd846-dcc1-42d1-ac26-715691b687d3%40postgrespro.ru
Author: Dmitry Koval, Alexander Korotkov
Reviewed-by: Robert Haas, Justin Pryzby, Pavel Borisov
Repeating loads of inplace-updated fields tends to cause bugs like the
one from the previous commit. While there's no bug to fix in these code
sites, adopt the load-once style. This improves the chance of future
copy/paste finding the safe style.
Discussion: https://postgr.es/m/20240423003956.e7.nmisch@google.com
vac_update_datfrozenxid() did multiple loads of relfrozenxid and
relminmxid from buffer memory, and it assumed each would get the same
value. Not so if a concurrent vac_update_relstats() did an inplace
update. Commit 2d2e40e3be fixed the same
kind of bug in vac_truncate_clog(). Today's bug could cause the
rel-level field and XIDs in the rel's rows to precede the db-level
field. A cluster having such values should VACUUM affected tables.
Back-patch to v12 (all supported versions).
Discussion: https://postgr.es/m/20240423003956.e7.nmisch@google.com
ALTER COLUMN TYPE wasn't expecting to find any pg_proc objects
depending on the column whose type is to be altered. That indeed
wasn't possible when this code was written, but it is possible
since we introduced new-style SQL function bodies.
It's about as difficult to fix this case as it is to fix dependent
views, and we've been punting on those for years, so I don't feel
too awful about punting for functions too. (I sure wouldn't risk
back-patching such code.) So just throw a more user-facing error.
Also, adjust some of the existing comments to reflect that these
are all pretty much the same issue.
(This patch also fixes it so we will tolerate finding such a
dependency during ALTER COLUMN SET EXPRESSION; in that, we need
not do anything to the function, so no error is wanted. That
problem is new in HEAD.)
Per bug #18449 from Alexander Lakhin. Back-patch to v14 where
we added new-style SQL functions.
Discussion: https://postgr.es/m/18449-f8248467aaa294d5@postgresql.org
Do not allow ALTER SUBSCRIPTION ... SET (failover = on|off) in a
transaction block as the changed failover option of the slot can't be
rolled back. For the same reason, we refrain from altering the replication
slot's failover property if the subscription is created with a valid
slot_name and create_slot=false.
Reprted-by: Kuroda Hayato
Author: Hou Zhijie
Reviewed-by: Shveta Malik, Bertrand Drouvot, Kuroda Hayato
Discussion: https://postgr.es/m/OS0PR01MB57165542B09DFA4943830BF294082@OS0PR01MB5716.jpnprd01.prod.outlook.com
When specifying the createdb strategy, the documentation suggests valid
options are FILE_COPY and WAL_LOG, but the code does case-sensitive
comparison and accepts only "file_copy" and "wal_log" as valid.
Fixed by doing a case-insensitive comparison using pg_strcasecmp(), same
as for other string parameters nearby.
While at it, apply fmtId() to a nearby "locale_provider". This already
did the comparison in case-insensitive way, but the value would not be
double-quoted, confusing the parser and the error message.
Backpatch to 15, where the strategy was introduced.
Backpatch-through: 15
Reviewed-by: Tom Lane
Discussion: https://postgr.es/m/90c6913a-1dd2-42b4-8365-ce3b09c39b17@enterprisedb.com
The optimization for inserts into BRIN indexes added by c1ec02be1d
relies on a cache that needs to be explicitly released after calling
index_insert(). The commit however failed to invoke the cleanup in
validate_index(), which calls index_insert() indirectly through
table_index_validate_scan().
After inspecting index_insert() callers, it seems unique_key_recheck()
is missing the call too.
Fixed by adding the two missing index_insert_cleanup() calls.
The commit does two additional improvements. The aminsertcleanup()
signature is modified to have the index as the first argument, to make
it more like the other AM callbacks. And the aminsertcleanup() callback
is invoked even if the ii_AmCache is NULL, so that it can decide if the
cleanup is necessary.
Author: Alvaro Herrera, Tomas Vondra
Reported-by: Alexander Lakhin
Discussion: https://postgr.es/m/202401091043.e3nrqiad6gb7@alvherre.pgsql
It is possible for certain cases to remove not-null constraints without
maintaining the attnotnull in its correct state; for example if you drop
a column that's part of the primary key, and the other columns of the PK don't
have not-null constraints, then we should reset the attnotnull flags for
those other columns; up to this commit, we didn't. Handle those cases
better by doing the attnotnull reset in RemoveConstraintById() instead
of in dropconstraint_internal().
However, there are some cases where we must not do so. For example if
those other columns are in replica identity indexes or are generated
identity columns, we must keep attnotnull set, even though it results in
the catalog inconsistency that no not-null constraint supports that.
Because the attnotnull reset now happens in more places than before, for
instance when a column of the primary key changes type, we need an
additional trick to reinstate it as necessary. Introduce a new
alter-table pass that does this, which needs simply reschedule some
AT_SetAttNotNull subcommands that were already being generated and
ignored.
Because of the exceptions in which attnotnull is not reset noted above,
we also include a pg_dump hack to include a not-null constraint when the
attnotnull flag is set even if no pg_constraint row exists. This part
is undesirable but necessary, because failing to handle the case can
result in unrestorable dumps.
Reported-by: Tender Wang <tndrwang@gmail.com>
Co-authored-by: Tender Wang <tndrwang@gmail.com>
Reviewed-by: jian he <jian.universality@gmail.com>
Discussion: https://postgr.es/m/CAHewXN=hMbNa3d43NOR=OCgdgpTt18S-1fmueCoEGesyeK4bqw@mail.gmail.com
In tables with primary keys, pg_dump creates tables with primary keys by
initially dumping them with throw-away not-null constraints (marked "no
inherit" so that they don't create problems elsewhere), to later drop
them once the primary key is restored. Because of a unrelated
consideration, on tables with children we add not-null constraints to
all columns of the primary key when it is created.
If both a table and its child have primary keys, and pg_dump happens to
emit the child table first (and its throw-away not-null) and later its
parent table, the creation of the parent's PK will fail because the
throw-away not-null constraint collides with the permanent not-null
constraint that the PK wants to add, so the dump fails to restore.
We can work around this problem by letting the primary key "take over"
the child's not-null. This requires no changes to pg_dump, just two
changes to ALTER TABLE: first, the ability to convert a no-inherit
not-null constraint into a regular inheritable one (including recursing
down to children, if there are any); second, the ability to "drop" a
constraint that is defined both directly in the table and inherited from
a parent (which simply means to mark it as no longer having a local
definition).
Secondarily, change ATPrepAddPrimaryKey() to acquire locks all the way
down the inheritance hierarchy, in case we need to recurse when
propagating constraints.
These two changes allow pg_dump to reproduce more cases involving
inheritance from versions 16 and older.
Lastly, make two changes to pg_dump: 1) do not try to drop a not-null
constraint that's marked as inherited; this allows a dump to restore
with no errors if a table with a PK inherits from another which also has
a PK; 2) avoid giving inherited constraints throwaway names, for the
rare cases where such a constraint survives after the restore.
Reported-by: Andrew Bille <andrewbille@gmail.com>
Reported-by: Justin Pryzby <pryzby@telsasoft.com>
Discussion: https://postgr.es/m/CAJnzarwkfRu76_yi3dqVF_WL-MpvT54zMwAxFwJceXdHB76bOA@mail.gmail.com
Discussion: https://postgr.es/m/Zh0aAH7tbZb-9HbC@pryzbyj2023
The ON_ERROR option of the COPY command previously allowed omitting
its value, which was inconsistent with the syntax synopsis in the
documentation and the behavior of other non-boolean COPY options.
This change enforces providing a value for the ON_ERROR option,
ensuring consistency across other non-boolean options and aligning
with the documented syntax.
Author: Atsushi Torikoshi
Reviewed-by: Masahiko Sawada
Discussion: https://postgr.es/m/a9770bf57646d90dedc3d54cf32634b2%40oss.nttdata.com
When matching constraints in AttachPartitionEnsureIndexes() we weren't
testing the constraint type, which could make a UNIQUE key lacking a
not-null constraint incorrectly satisfy a primary key requirement. Fix
this by testing that the constraint types match. (Other possible
mismatches are verified by comparing index properties.)
Discussion: https://postgr.es/m/202402051447.wimb4xmtiiyb@alvherre.pgsql
In one of the many strange corner cases of multiple inheritance being
used, commit b0e96f3119 missed a CommandCounterIncrement() call after
updating the attnotnull flag during ALTER TABLE ADD COLUMN, which caused
a catalog tuple to be update attempted twice in the same command, giving
rise to a "tuple already updated by self" error. Add the missing call
to solve that, and a test case that reproduces the scenario.
As a (perhaps surprising) secondary effect, this CCI addition triggers
another behavior change: when a primary key is added to a parent
partitioned table and the column in an existing partition does not have
a not-null constraint, we no longer error out. This will probably be a
welcome change by some users, and I think it's unlikely that anybody
will miss the old behavior.
Reported-by: Alexander Lakhin <exclusion@gmail.com>
Discussion: http://postgr.es/m/045dec3f-9b3d-aa44-0c99-85f6992306c7@gmail.com
While keeping API the same, this commit provides a way for block-level table
AMs to re-use existing acquire_sample_rows() by providing custom callbacks
for getting the next block and the next tuple.
Reported-by: Andres Freund
Discussion: https://postgr.es/m/20240407214001.jgpg5q3yv33ve6y3%40awork3.anarazel.de
Reviewed-by: Pavel Borisov
Let table AM define custom reloptions for its tables. This allows specifying
AM-specific parameters by the WITH clause when creating a table.
The reloptions, which could be used outside of table AM, are now extracted
into the CommonRdOptions data structure. These options could be by decision
of table AM directly specified by a user or calculated in some way.
The new test module test_tam_options evaluates the ability to set up custom
reloptions and calculate fields of CommonRdOptions on their base.
The code may use some parts from prior work by Hao Wu.
Discussion: https://postgr.es/m/CAPpHfdurb9ycV8udYqM%3Do0sPS66PJ4RCBM1g-bBpvzUfogY0EA%40mail.gmail.com
Discussion: https://postgr.es/m/AMUA1wBBBxfc3tKRLLdU64rb.1.1683276279979.Hmail.wuhao%40hashdata.cn
Reviewed-by: Reviewed-by: Pavel Borisov, Matthias van de Meent, Jess Davis
This new DDL command splits a single partition into several parititions.
Just like ALTER TABLE ... MERGE PARTITIONS ... command, new patitions are
created using createPartitionTable() function with parent partition as the
template.
This commit comprises quite naive implementation which works in single process
and holds the ACCESS EXCLUSIVE LOCK on the parent table during all the
operations including the tuple routing. This is why this new DDL command
can't be recommended for large partitioned tables under a high load. However,
this implementation come in handy in certain cases even as is.
Also, it could be used as a foundation for future implementations with lesser
locking and possibly parallel.
Discussion: https://postgr.es/m/c73a1746-0cd0-6bdd-6b23-3ae0b7c0c582%40postgrespro.ru
Author: Dmitry Koval
Reviewed-by: Matthias van de Meent, Laurenz Albe, Zhihong Yu, Justin Pryzby
Reviewed-by: Alvaro Herrera, Robert Haas, Stephane Tachoires
