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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>E.4. Release 15.3</title><link rel="stylesheet" type="text/css" href="stylesheet.css" /><link rev="made" href="pgsql-docs@lists.postgresql.org" /><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /><link rel="prev" href="release-15-4.html" title="E.3. Release 15.4" /><link rel="next" href="release-15-2.html" title="E.5. Release 15.2" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">E.4. Release 15.3</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="release-15-4.html" title="E.3. Release 15.4">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="release.html" title="Appendix E. Release Notes">Up</a></td><th width="60%" align="center">Appendix E. Release Notes</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 15.6 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="release-15-2.html" title="E.5. Release 15.2">Next</a></td></tr></table><hr /></div><div class="sect1" id="RELEASE-15-3"><div class="titlepage"><div><div><h2 class="title" style="clear: both">E.4. Release 15.3</h2></div></div></div><div class="toc"><dl class="toc"><dt><span class="sect2"><a href="release-15-3.html#id-1.11.6.8.4">E.4.1. Migration to Version 15.3</a></span></dt><dt><span class="sect2"><a href="release-15-3.html#id-1.11.6.8.5">E.4.2. Changes</a></span></dt></dl></div><p><strong>Release date: </strong>2023-05-11</p><p>
This release contains a variety of fixes from 15.2.
For information about new features in major release 15, see
<a class="xref" href="release-15.html" title="E.7. Release 15">Section E.7</a>.
</p><div class="sect2" id="id-1.11.6.8.4"><div class="titlepage"><div><div><h3 class="title">E.4.1. Migration to Version 15.3</h3></div></div></div><p>
A dump/restore is not required for those running 15.X.
</p><p>
However, if you are upgrading from a version earlier than 15.1,
see <a class="xref" href="release-15-1.html" title="E.6. Release 15.1">Section E.6</a>.
</p></div><div class="sect2" id="id-1.11.6.8.5"><div class="titlepage"><div><div><h3 class="title">E.4.2. Changes</h3></div></div></div><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p>
Prevent <code class="command">CREATE SCHEMA</code> from defeating changes
in <code class="varname">search_path</code> (Alexander Lakhin)
</p><p>
Within a <code class="command">CREATE SCHEMA</code> command, objects in the
prevailing <code class="varname">search_path</code>, as well as those in the
newly-created schema, would be visible even within a called
function or script that attempted to set a
secure <code class="varname">search_path</code>. This could allow any user
having permission to create a schema to hijack the privileges of a
security definer function or extension script.
</p><p>
The <span class="productname">PostgreSQL</span> Project thanks
Alexander Lakhin for reporting this problem.
(CVE-2023-2454)
</p></li><li class="listitem"><p>
Enforce row-level security policies correctly after inlining a
set-returning function (Stephen Frost, Tom Lane)
</p><p>
If a set-returning SQL-language function refers to a table having
row-level security policies, and it can be inlined into a calling
query, those RLS policies would not get enforced properly in some
cases involving re-using a cached plan under a different role.
This could allow a user to see or modify rows that should have been
invisible.
</p><p>
The <span class="productname">PostgreSQL</span> Project thanks
Wolfgang Walther for reporting this problem.
(CVE-2023-2455)
</p></li><li class="listitem"><p>
Fix potential corruption of the template (source) database after
<code class="command">CREATE DATABASE</code> with the <code class="literal">STRATEGY
WAL_LOG</code> option (Nathan Bossart, Ryo Matsumura)
</p><p>
Improper buffer handling created a risk that any later modification
of the template's <code class="structname">pg_class</code> catalog would be
lost.
</p></li><li class="listitem"><p>
Fix memory leakage and unnecessary disk reads
during <code class="command">CREATE DATABASE</code> with the <code class="literal">STRATEGY
WAL_LOG</code> option (Andres Freund)
</p></li><li class="listitem"><p>
Avoid crash when the new schema name is omitted
in <code class="command">CREATE SCHEMA</code> (Michael Paquier)
</p><p>
The SQL standard allows writing <code class="literal">CREATE SCHEMA AUTHORIZATION
<em class="replaceable"><code>owner_name</code></em></code>, with the schema
name defaulting to <em class="replaceable"><code>owner_name</code></em>. However
some code paths expected the schema name to be present and would
fail.
</p></li><li class="listitem"><p>
Fix various planner failures with <code class="command">MERGE</code>
commands (Tom Lane)
</p><p>
Planning could fail with errors like <span class="quote">“<span class="quote">variable not found in
subplan target list</span>”</span> or <span class="quote">“<span class="quote">PlaceHolderVar found where not
expected</span>”</span>.
</p></li><li class="listitem"><p>
Fix the row count reported by <code class="command">MERGE</code> for some
corner cases (Dean Rasheed)
</p><p>
The row count reported in the command tag counted rows that actually
hadn't been modified due to a <code class="literal">BEFORE ROW</code> trigger
returning NULL. This is inconsistent with what happens in
plain <code class="command">UPDATE</code> or <code class="command">DELETE</code>, so
change it to not count such rows. Also, avoid counting a row twice
when <code class="command">MERGE</code> moves it into a different partition of
a partitioned table.
</p></li><li class="listitem"><p>
Fix <code class="command">MERGE</code> problems with concurrent updates
(Dean Rasheed, Álvaro Herrera)
</p><p>
Some cases misbehaved if a row to be updated or deleted
by <code class="command">MERGE</code> had just been updated by a concurrent
transaction. This could lead to a crash, or the wrong merge action
being executed, or no action at all.
</p></li><li class="listitem"><p>
Add support for decompiling <code class="command">MERGE</code>
commands (Álvaro Herrera)
</p><p>
This was overlooked when <code class="command">MERGE</code> was added, but
it's essential support for <code class="command">MERGE</code> in new-style SQL
functions.
</p></li><li class="listitem"><p>
Fix enabling/disabling of foreign-key triggers in partitioned tables
(Tom Lane)
</p><p>
<code class="command">ALTER TABLE ... ENABLE/DISABLE TRIGGER</code> failed if
applied to a partitioned table's foreign-key enforcement triggers,
because it tried to locate the clone triggers for the partitions by
name, and they do not have the same name. Locate them by
parent-trigger OID instead.
</p></li><li class="listitem"><p>
Disallow altering composite types that are stored in indexes
(Tom Lane)
</p><p>
<code class="command">ALTER TYPE</code> disallows non-binary-compatible
modifications of composite types if they are stored in any table
columns. (Perhaps that will be allowed someday, but it hasn't
happened yet; the locking implications of rewriting many tables are
daunting.) We overlooked the possibility that an index might
contain a composite type that doesn't also appear in its table.
</p></li><li class="listitem"><p>
Disallow system columns as elements of foreign keys (Tom Lane)
</p><p>
Since the removal of OID as a system column, there is no plausible
use-case for this, and various bits of code no longer support it.
Disallow it rather than trying to fix all the cases.
</p></li><li class="listitem"><p>
Ensure that <code class="command">COPY TO</code> from an RLS-enabled parent
table does not copy any rows from child tables (Antonin Houska)
</p><p>
The documentation is quite clear that <code class="command">COPY TO</code>
copies rows from only the named table, not any inheritance children
it may have. However, if row-level security was enabled on the table
then this stopped being true.
</p></li><li class="listitem"><p>
Avoid possible crash when <code class="function">array_position()</code>
or <code class="function">array_positions()</code> is passed an empty array
(Tom Lane)
</p></li><li class="listitem"><p>
Fix possible out-of-bounds fetch in <code class="function">to_char()</code>
(Tom Lane)
</p><p>
With bad luck this could have resulted in a server crash.
</p></li><li class="listitem"><p>
Avoid buffer overread in <code class="function">translate()</code> function
(Daniil Anisimov)
</p><p>
When using the deletion feature, the function might fetch the byte
just after the input string, creating a small risk of crash.
</p></li><li class="listitem"><p>
Adjust text-search-related character classification logic to
correctly detect whether the prevailing locale
is <code class="literal">C</code> (Jeff Davis)
</p><p>
This code got confused if the database's default collation uses ICU.
</p></li><li class="listitem"><p>
Avoid possible crash on empty input for type <code class="type">interval</code>
(Tom Lane)
</p></li><li class="listitem"><p>
Re-allow exponential notation in ISO-8601 interval fields
(Tom Lane)
</p><p>
Interval input like <code class="literal">P0.1e10D</code> isn't officially
sanctioned by ISO-8601, but we accepted it for a long time before
version 15, so re-allow it.
</p></li><li class="listitem"><p>
Fix error cursor setting for parse errors in JSON string literals
(Tom Lane)
</p><p>
Most cases in which a syntax error is detected in a string literal
within a JSON value failed to set the error cursor appropriately.
This led at least to an unhelpful error message (pointing to the
token before the string, rather than the actual trouble spot), and
could even result in a crash in v14 and later.
</p></li><li class="listitem"><p>
Fix data corruption due to <code class="varname">vacuum_defer_cleanup_age</code>
being larger than the current 64-bit xid (Andres Freund)
</p><p>
In v14 and later with non-default settings
of <code class="varname">vacuum_defer_cleanup_age</code>, it was possible to
compute a very large vacuum cleanup horizon xid, leading to vacuum
removing rows that are still live. v12 and v13 have a lesser form
of the same problem affecting only GiST indexes, which could lead to
index pages getting recycled too early.
</p></li><li class="listitem"><p>
Fix parser's failure to detect some cases of improperly-nested
aggregates (Tom Lane)
</p><p>
This oversight could lead to executor failures for queries that
should have been rejected as invalid.
</p></li><li class="listitem"><p>
Fix data structure corruption during parsing of
serial <code class="literal">SEQUENCE NAME</code> options (David Rowley)
</p><p>
This can lead to trouble if an event trigger captures the corrupted
parse tree.
</p></li><li class="listitem"><p>
Correctly update plan nodes' parallel-safety markings when moving
initplans from one node to another (Tom Lane)
</p><p>
This planner oversight could lead to <span class="quote">“<span class="quote">subplan was not
initialized</span>”</span> errors at runtime.
</p></li><li class="listitem"><p>
Avoid failure with PlaceHolderVars in extended-statistics code
(Tom Lane)
</p><p>
Use of dependency-type extended statistics could fail with
<span class="quote">“<span class="quote">PlaceHolderVar found where not expected</span>”</span>.
</p></li><li class="listitem"><p>
Fix incorrect tests for whether a qual clause applied to a subquery
can be transformed into a window aggregate <span class="quote">“<span class="quote">run
condition</span>”</span> within the subquery (David Rowley)
</p><p>
A SubPlan within such a clause would cause assertion failures or
incorrect answers, as would some other unusual cases.
</p></li><li class="listitem"><p>
Disable the inverse-transition optimization for window aggregates
when the call contains sub-SELECTs (David Rowley)
</p><p>
This optimization requires that the aggregate's argument expressions
have repeatable results, which might not hold for a sub-SELECT.
</p></li><li class="listitem"><p>
Fix oversights in execution of nested <code class="literal">ARRAY[]</code>
constructs (Alexander Lakhin, Tom Lane)
</p><p>
Correctly detect overflow of the total space needed for the result
array, avoiding a possible crash due to undersized output
allocation. Also ensure that any trailing padding space in the
result array is zeroed; while leaving garbage there is harmless for
most purposes, it can result in odd behavior later.
</p></li><li class="listitem"><p>
Prevent crash when updating a field within an
array-of-domain-over-composite-type column (Dmitry Dolgov)
</p></li><li class="listitem"><p>
Fix partition pruning logic for partitioning on boolean columns
(David Rowley)
</p><p>
Pruning with a condition like <code class="literal">boolcol IS NOT TRUE</code>
was done incorrectly, leading to possibly not returning rows in
which <code class="literal">boolcol</code> is NULL. Also, the rather unlikely
case of partitioning on <code class="literal">NOT boolcol</code> was handled
incorrectly.
</p></li><li class="listitem"><p>
Fix race condition in per-batch cleanup during parallel hash join
(Thomas Munro, Melanie Plageman)
</p><p>
A crash was possible given unlucky timing and
<code class="varname">parallel_leader_participation</code>
= <code class="literal">off</code> (which is not the default).
</p></li><li class="listitem"><p>
Recalculate <code class="literal">GENERATED</code> columns after an
EvalPlanQual check (Tom Lane)
</p><p>
In <code class="literal">READ COMMITTED</code> isolation mode, the effects of
a row update might need to get reapplied to a newer version of the
row than the query found originally. If so, we need to recompute
any <code class="literal">GENERATED</code> columns, in case they depend on
columns that were changed by the concurrent update.
</p></li><li class="listitem"><p>
Fix memory leak in Memoize plan execution (David Rowley)
</p></li><li class="listitem"><p>
Fix buffer refcount leak when using batched inserts for a foreign
table included in a partitioned tree (Alexander Pyhalov)
</p></li><li class="listitem"><p>
Restore support for
sub-millisecond <code class="varname">vacuum_cost_delay</code> settings
(Thomas Munro)
</p></li><li class="listitem"><p>
Don't balance vacuum cost delay when a table has a
per-relation <code class="varname">vacuum_cost_delay</code> setting of zero
(Masahiko Sawada)
</p><p>
Delay balancing is supposed to be disabled whenever autovacuum is
processing a table with a
per-relation <code class="varname">vacuum_cost_delay</code> setting, but this
was done only for positive settings, not zero.
</p></li><li class="listitem"><p>
Fix corner-case crashes when columns have been added to the end of a
view (Tom Lane)
</p></li><li class="listitem"><p>
Repair rare failure of MULTIEXPR_SUBLINK subplans in partitioned
updates (Andres Freund, Tom Lane)
</p><p>
Use of the syntax <code class="literal">INSERT ... ON CONFLICT DO UPDATE SET (c1,
...) = (SELECT ...)</code> with a partitioned target table could
result in failure if any child table is dissimilar from the parent
(for example, different physical column order).
This typically manifested as failure of consistency checks in the
executor; but a crash or incorrect data updates are also possible.
</p></li><li class="listitem"><p>
Fix handling of <code class="literal">DEFAULT</code> markers within a
multi-row <code class="literal">INSERT ... VALUES</code> query on a view that
has a <code class="literal">DO ALSO INSERT ... SELECT</code> rule (Dean
Rasheed)
</p><p>
Such cases typically failed with <span class="quote">“<span class="quote">unrecognized node
type</span>”</span> errors or assertion failures.
</p></li><li class="listitem"><p>
Support references to <code class="literal">OLD</code>
and <code class="literal">NEW</code> within subqueries in rule actions
(Dean Rasheed, Tom Lane)
</p><p>
Such references are really lateral references, but the server could
crash if the subquery wasn't explicitly marked
with <code class="literal">LATERAL</code>. Arrange to do that implicitly when
necessary.
</p></li><li class="listitem"><p>
When decompiling a rule or SQL function body
containing <code class="command">INSERT</code>/<code class="command">UPDATE</code>/<code class="command">DELETE</code>
within <code class="command">WITH</code>, take care to print the correct alias
for the target table (Tom Lane)
</p></li><li class="listitem"><p>
Fix glitches in <code class="literal">SERIALIZABLE READ ONLY</code>
optimization (Thomas Munro)
</p><p>
Transactions already marked as <span class="quote">“<span class="quote">doomed</span>”</span> confused the
safe-snapshot optimization for <code class="literal">SERIALIZABLE READ
ONLY</code> transactions. The optimization was unnecessarily
skipped in some cases. In other cases an assertion failure occurred
(but there was no problem in non-assert builds).
</p></li><li class="listitem"><p>
Avoid leaking cache callback slots in
the <code class="literal">pgoutput</code> logical decoding plugin (Shi Yu)
</p><p>
Multiple cycles of starting up and shutting down the plugin within a
single session would eventually lead to an <span class="quote">“<span class="quote">out of
relcache_callback_list slots</span>”</span> error.
</p></li><li class="listitem"><p>
Avoid unnecessary calls to custom validators for index operator
class options (Alexander Korotkov)
</p><p>
This change fixes some cases where an unexpected error was thrown.
</p></li><li class="listitem"><p>
Avoid useless work while scanning a multi-column BRIN index with
multiple scan keys (Tomas Vondra)
</p><p>
The existing code effectively considered only the last scan key
while deciding whether a range matched, thus usually scanning more
of the index than it needed to.
</p></li><li class="listitem"><p>
Fix netmask handling in BRIN inet_minmax_multi_ops opclass
(Tomas Vondra)
</p><p>
This error triggered an assertion failure in assert-enabled builds,
but is mostly harmless in production builds.
</p></li><li class="listitem"><p>
Fix dereference of dangling pointer during buffering build of a GiST
index (Alexander Lakhin)
</p><p>
This error seems to usually be harmless in production builds, as the
fetched value is noncritical; but in principle it could cause a
server crash.
</p></li><li class="listitem"><p>
Ignore dropped columns and generated columns during logical
replication of an update or delete action (Onder Kalaci, Shi Yu)
</p><p>
Replication with the <code class="literal">REPLICA IDENTITY FULL</code> option
failed if the table contained such columns.
</p></li><li class="listitem"><p>
Correct the name of the wait event for SLRU buffer I/O for commit
timestamps (Alexander Lakhin)
</p><p>
This wait event is named <code class="literal">CommitTsBuffer</code> according
to the documentation, but the code had it
as <code class="literal">CommitTSBuffer</code>. Change the code to match the
documentation, as that way is more consistent with the naming of
related wait events.
</p></li><li class="listitem"><p>
Re-activate reporting of wait event <code class="literal">SLRUFlushSync</code>
(Thomas Munro)
</p><p>
Reporting of this type of wait was accidentally removed in code
refactoring.
</p></li><li class="listitem"><p>
Avoid possible underflow when calculating how many WAL segments to
keep (Kyotaro Horiguchi)
</p><p>
This could result in not honoring <code class="varname">wal_keep_size</code>
accurately.
</p></li><li class="listitem"><p>
Disable startup progress reporting overhead in standby mode
(Bharath Rupireddy)
</p><p>
In standby mode, we don't actually report progress of recovery,
but we were doing work to track it anyway.
</p></li><li class="listitem"><p>
Support RSA-PSS certificates with SCRAM-SHA-256 channel binding
(Jacob Champion, Heikki Linnakangas)
</p><p>
This feature requires building with OpenSSL 1.1.1 or newer. Both
the server and <span class="application">libpq</span> are affected.
</p></li><li class="listitem"><p>
Avoid race condition with process ID tracking on Windows (Thomas Munro)
</p><p>
The operating system could recycle a PID before the postmaster
observed that that child process was gone. This could lead to
tracking more than one child with the same PID, resulting in
confusion.
</p></li><li class="listitem"><p>
Fix <code class="function">list_copy_head()</code> to work correctly on an
empty List (David Rowley)
</p><p>
This case is not known to be reached by any
core <span class="productname">PostgreSQL</span> code, but extensions
might rely on it working.
</p></li><li class="listitem"><p>
Add missing cases to <code class="function">SPI_result_code_string()</code>
(Dean Rasheed)
</p></li><li class="listitem"><p>
Fix erroneous Valgrind markings
in <code class="function">AllocSetRealloc()</code> (Karina Litskevich)
</p><p>
In the unusual case where the size of a large (>8kB) palloc chunk
is decreased, a Valgrind-aware build would mismark the defined-ness
state of the memory released from the chunk, possibly causing
incorrect results during Valgrind testing.
</p></li><li class="listitem"><p>
Fix assertion failure for <code class="command">MERGE</code> into a
partitioned table with row-level security enabled (Dean Rasheed)
</p></li><li class="listitem"><p>
Avoid assertion failure when decoding a transactional logical
replication message (Tomas Vondra)
</p></li><li class="listitem"><p>
Avoid locale sensitivity when processing regular expression escapes
(Jeff Davis)
</p><p>
A backslash followed by a non-ASCII character could sometimes cause
an assertion failure, depending on the prevailing locale.
</p></li><li class="listitem"><p>
Avoid trying to write an empty WAL record
in <code class="function">log_newpage_range()</code> when the last few pages
in the specified range are empty (Matthias van de Meent)
</p><p>
It is not entirely clear whether this case is reachable in released
branches, but if it is then an assertion failure could occur.
</p></li><li class="listitem"><p>
Fix session-lifespan memory leakage in <span class="application">plpgsql</span>
<code class="literal">DO</code> blocks that use cast expressions
(Ajit Awekar, Tom Lane)
</p></li><li class="listitem"><p>
Tighten array dimensionality checks when converting Perl
list structures to multi-dimensional SQL arrays (Tom Lane)
</p><p>
<span class="application">plperl</span> could misbehave when the nesting
of sub-lists is inconsistent so that the data does not represent a
rectangular array of values. Such cases now produce errors, but
previously they could result in a crash or garbage output.
</p></li><li class="listitem"><p>
Tighten array dimensionality checks when converting Python
list structures to multi-dimensional SQL arrays (Tom Lane)
</p><p>
<span class="application">plpython</span> could misbehave when dealing
with empty sub-lists, or when the nesting of sub-lists is
inconsistent so that the data does not represent a rectangular array
of values. The former should result in an empty output array, and
the latter in an error. But some cases resulted in a crash, and
others in unexpected output.
</p></li><li class="listitem"><p>
Fix unwinding of exception stack
in <span class="application">plpython</span> (Xing Guo)
</p><p>
Some rare failure cases could return without cleaning up the PG_TRY
exception stack, risking a crash if another error was raised before
the next stack level was unwound.
</p></li><li class="listitem"><p>
Fix inconsistent GSS-encryption error handling
in <span class="application">libpq</span>'s
<code class="function">PQconnectPoll()</code>
(Michael Paquier)
</p><p>
With <code class="option">gssencmode</code> set to <code class="literal">require</code>,
the connection was not marked dead after a GSS initialization
failure. Make it fail immediately, as the equivalent case for TLS
encryption has long done.
</p></li><li class="listitem"><p>
Fix possible data corruption in <span class="application">ecpg</span>
programs built with the <code class="option">-C ORACLE</code> option
(Kyotaro Horiguchi)
</p><p>
When <code class="function">ecpg_get_data()</code> is called
with <code class="varname">varcharsize</code> set to zero, it could write a
terminating zero character into the last byte of the preceding
field, truncating the data in that field.
</p></li><li class="listitem"><p>
Fix <span class="application">pg_dump</span> so that partitioned tables
that are hash-partitioned on an enum-type column can be restored
successfully (Tom Lane)
</p><p>
Since the hash codes for enum values depend on the OIDs assigned to
the enum, they are typically different after a dump and restore,
meaning that rows often need to go into a different partition than
they were in originally. Users can work around that by specifying
the <code class="option">--load-via-partition-root</code> option; but since
there is very little chance of success without that,
teach <span class="application">pg_dump</span> to apply it automatically
to such tables.
</p><p>
Also, fix <span class="application">pg_restore</span> to not try
to <code class="command">TRUNCATE</code> target tables before restoring into
them when <code class="option">--load-via-partition-root</code> mode is used.
This avoids a hazard of deadlocks and lost data.
</p></li><li class="listitem"><p>
Correctly detect non-seekable files on Windows
(Juan José Santamaría Flecha, Michael Paquier, Daniel Watzinger)
</p><p>
This bug led to misbehavior when <span class="application">pg_dump</span>
writes to a pipe or <span class="application">pg_restore</span> reads from
one.
</p></li><li class="listitem"><p>
In <span class="application">pgbench</span>'s <span class="quote">“<span class="quote">prepared</span>”</span>
mode, prepare all the commands in a pipeline before starting the
pipeline (Álvaro Herrera)
</p><p>
This avoids a failure when a pgbench script tries to
start a serializable transaction inside a pipeline.
</p></li><li class="listitem"><p>
In <code class="filename">contrib/amcheck</code>'s heap checking code, deal
correctly with tuples having zero xmin or xmax (Robert Haas)
</p></li><li class="listitem"><p>
In <code class="filename">contrib/amcheck</code>, deal sanely with xids that
appear to be before epoch zero (Andres Freund)
</p><p>
In cases of corruption we might see a wrapped-around 32-bit xid that
appears to be before the first xid epoch. Promoting such a value to
64-bit form produced a value far in the future, resulting in wrong
reports. Return FirstNormalFullTransactionId in such cases so that
things work reasonably sanely.
</p></li><li class="listitem"><p>
In <code class="filename">contrib/basebackup_to_shell</code>, properly detect
failure to open a pipe (Robert Haas)
</p></li><li class="listitem"><p>
In <code class="filename">contrib/hstore_plpython</code>, avoid crashing if
the Python value to be transformed isn't a mapping (Dmitry Dolgov,
Tom Lane)
</p><p>
This should give an error, but Python 3 changed some APIs in a way
that caused the check to misbehave, allowing a crash to ensue.
</p></li><li class="listitem"><p>
Require the <code class="literal">siglen</code> option of a GiST index on
an <code class="type">ltree</code> column, if specified, to be a multiple of 4
(Alexander Korotkov)
</p><p>
Other values result in misaligned accesses to index content, which
is harmless on Intel-compatible hardware but can cause a crash on
some other architectures.
</p></li><li class="listitem"><p>
In <code class="filename">contrib/pageinspect</code>, add defenses against
incorrect input for the <code class="function">gist_page_items()</code> function
(Dmitry Koval)
</p></li><li class="listitem"><p>
Fix misbehavior in <code class="filename">contrib/pg_trgm</code> with an
unsatisfiable regular expression (Tom Lane)
</p><p>
A regex such as <code class="literal">$foo</code> is legal but unsatisfiable;
the regex compiler recognizes that and produces an empty NFA graph.
Attempting to optimize such a graph into a pg_trgm GIN or GiST index
qualification resulted in accessing off the end of a work array,
possibly leading to crashes.
</p></li><li class="listitem"><p>
Fix handling of escape sequences
in <code class="filename">contrib/postgres_fdw</code>'s
<code class="varname">application_name</code> parameter (Kyotaro Horiguchi,
Michael Paquier)
</p><p>
The code to expand these could fail if executed in a background
process, as for example during auto-analyze of a foreign table.
</p></li><li class="listitem"><p>
In <code class="filename">contrib/pg_walinspect</code>, limit memory usage
of <code class="function">pg_get_wal_records_info()</code> (Bharath Rupireddy)
</p></li><li class="listitem"><p>
Use the <code class="option">--strip-unneeded</code> option when stripping
static libraries with
GNU-compatible <span class="application">strip</span> (Tom Lane)
</p><p>
Previously, <code class="literal">make install-strip</code> used
the <code class="option">-x</code> option in this case. This change avoids
misbehavior of <span class="application">llvm-strip</span>, and gives
slightly smaller output as well.
</p></li><li class="listitem"><p>
Stop recommending auto-download of DTD files for building the
documentation, and indeed disable it (Aleksander Alekseev, Peter
Eisentraut, Tom Lane)
</p><p>
It appears no longer possible to build the SGML documentation
without a local installation of the DocBook DTD files.
Formerly <span class="application">xsltproc</span> could download those
files on-the-fly from sourceforge.net; but sourceforge.net now
permits only HTTPS access, and no common version
of <span class="application">xsltproc</span> supports that. Hence, remove
the bits of our documentation suggesting that that's possible or
useful, and instead
add <span class="application">xsltproc</span>'s <code class="option">--nonet</code>
option to the build recipes.
</p></li><li class="listitem"><p>
When running TAP tests in PGXS builds, use a saner location for the
temporary <code class="filename">portlock</code> directory (Peter Eisentraut)
</p><p>
Place it under <code class="filename">tmp_check</code> in the build
directory. With the previous coding, a PGXS build would try to place
it in the installation directory, which is not necessarily writable.
</p></li><li class="listitem"><p>
Update time zone data files to <span class="application">tzdata</span>
release 2023c for DST law changes in Egypt, Greenland, Morocco, and
Palestine.
</p><p>
When observing Moscow time, Europe/Kirov and Europe/Volgograd now
use the abbreviations MSK/MSD instead of numeric abbreviations,
for consistency with other timezones observing Moscow time.
Also, America/Yellowknife is no longer distinct from America/Edmonton;
this affects some pre-1948 timestamps in that area.
</p></li></ul></div></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="release-15-4.html" title="E.3. Release 15.4">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="release.html" title="Appendix E. Release Notes">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="release-15-2.html" title="E.5. Release 15.2">Next</a></td></tr><tr><td width="40%" align="left" valign="top">E.3. Release 15.4 </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 15.6 Documentation">Home</a></td><td width="40%" align="right" valign="top"> E.5. Release 15.2</td></tr></table></div></body></html>
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