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<!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.22. Release 10.2</title><link rel="stylesheet" type="text/css" href="stylesheet.css" /><link rev="made" href="[email protected]" /><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /><link rel="prev" href="release-10-3.html" title="E.21. Release 10.3" /><link rel="next" href="release-10-1.html" title="E.23. Release 10.1" /></head><body><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">E.22. Release 10.2</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="release-10-3.html" title="E.21. Release 10.3">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 10.23 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="release-10-1.html" title="E.23. Release 10.1">Next</a></td></tr></table><hr></hr></div><div class="sect1" id="RELEASE-10-2"><div class="titlepage"><div><div><h2 class="title" style="clear: both">E.22. Release 10.2</h2></div></div></div><div class="toc"><dl class="toc"><dt><span class="sect2"><a href="release-10-2.html#id-1.11.6.26.4">E.22.1. Migration to Version 10.2</a></span></dt><dt><span class="sect2"><a href="release-10-2.html#id-1.11.6.26.5">E.22.2. Changes</a></span></dt></dl></div><p><strong>Release date: </strong>2018-02-08</p><p> This release contains a variety of fixes from 10.1.
For information about new features in major release 10, see
<a class="xref" href="release-10.html" title="E.24. Release 10">Section E.24</a>.
</p><div class="sect2" id="id-1.11.6.26.4"><div class="titlepage"><div><div><h3 class="title">E.22.1. Migration to Version 10.2</h3></div></div></div><p> A dump/restore is not required for those running 10.X.
</p><p> However,
if you use <code class="filename">contrib/cube</code>'s <code class="literal">~></code>
operator, see the entry below about that.
</p><p> Also, if you are upgrading from a version earlier than 10.1,
see <a class="xref" href="release-10-1.html" title="E.23. Release 10.1">Section E.23</a>.
</p></div><div class="sect2" id="id-1.11.6.26.5"><div class="titlepage"><div><div><h3 class="title">E.22.2. Changes</h3></div></div></div><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p> Fix processing of partition keys containing multiple expressions
(Álvaro Herrera, David Rowley)
</p><p> This error led to crashes or, with carefully crafted input, disclosure
of arbitrary backend memory.
(CVE-2018-1052)
</p></li><li class="listitem"><p> Ensure that all temporary files made
by <span class="application">pg_upgrade</span> are non-world-readable
(Tom Lane, Noah Misch)
</p><p> <span class="application">pg_upgrade</span> normally restricts its
temporary files to be readable and writable only by the calling user.
But the temporary file containing <code class="literal">pg_dumpall -g</code>
output would be group- or world-readable, or even writable, if the
user's <code class="literal">umask</code> setting allows. In typical usage on
multi-user machines, the <code class="literal">umask</code> and/or the working
directory's permissions would be tight enough to prevent problems;
but there may be people using <span class="application">pg_upgrade</span>
in scenarios where this oversight would permit disclosure of database
passwords to unfriendly eyes.
(CVE-2018-1053)
</p></li><li class="listitem"><p> Fix vacuuming of tuples that were updated while key-share locked
(Andres Freund, Álvaro Herrera)
</p><p> In some cases <code class="command">VACUUM</code> would fail to remove such
tuples even though they are now dead, leading to assorted data
corruption scenarios.
</p></li><li class="listitem"><p> Fix failure to mark a hash index's metapage dirty after
adding a new overflow page, potentially leading to index corruption
(Lixian Zou, Amit Kapila)
</p></li><li class="listitem"><p> Ensure that vacuum will always clean up the pending-insertions list of
a GIN index (Masahiko Sawada)
</p><p> This is necessary to ensure that dead index entries get removed.
The old code got it backwards, allowing vacuum to skip the cleanup if
some other process were running cleanup concurrently, thus risking
invalid entries being left behind in the index.
</p></li><li class="listitem"><p> Fix inadequate buffer locking in some LSN fetches (Jacob Champion,
Asim Praveen, Ashwin Agrawal)
</p><p> These errors could result in misbehavior under concurrent load.
The potential consequences have not been characterized fully.
</p></li><li class="listitem"><p> Fix incorrect query results from cases involving flattening of
subqueries whose outputs are used in <code class="literal">GROUPING SETS</code>
(Heikki Linnakangas)
</p></li><li class="listitem"><p> Fix handling of list partitioning constraints for partition keys of
boolean or array types (Amit Langote)
</p></li><li class="listitem"><p> Avoid unnecessary failure in a query on an inheritance tree that
occurs concurrently with some child table being removed from the tree
by <code class="command">ALTER TABLE NO INHERIT</code> (Tom Lane)
</p></li><li class="listitem"><p> Fix spurious deadlock failures when multiple sessions are
running <code class="command">CREATE INDEX CONCURRENTLY</code> (Jeff Janes)
</p></li><li class="listitem"><p> During <code class="command">VACUUM FULL</code>, update the table's size fields
in <code class="structname">pg_class</code> sooner (Amit Kapila)
</p><p> This prevents poor behavior when rebuilding hash indexes on the
table, since those use the <code class="structname">pg_class</code>
statistics to govern the initial hash size.
</p></li><li class="listitem"><p> Fix
<code class="literal">UNION</code>/<code class="literal">INTERSECT</code>/<code class="literal">EXCEPT</code>
over zero columns (Tom Lane)
</p></li><li class="listitem"><p> Disallow identity columns on typed tables and partitions
(Michael Paquier)
</p><p> These cases will be treated as unsupported features for now.
</p></li><li class="listitem"><p> Fix assorted failures to apply the correct default value when
inserting into an identity column (Michael Paquier, Peter Eisentraut)
</p><p> In several contexts, notably <code class="command">COPY</code>
and <code class="command">ALTER TABLE ADD COLUMN</code>, the expected default
value was not applied and instead a null value was inserted.
</p></li><li class="listitem"><p> Fix failures when an inheritance tree contains foreign child tables
(Etsuro Fujita)
</p><p> A mix of regular and foreign tables in an inheritance tree resulted in
creation of incorrect plans for <code class="command">UPDATE</code>
and <code class="command">DELETE</code> queries. This led to visible failures in
some cases, notably when there are row-level triggers on a foreign
child table.
</p></li><li class="listitem"><p> Repair failure with correlated sub-<code class="literal">SELECT</code>
inside <code class="literal">VALUES</code> inside a <code class="literal">LATERAL</code>
subquery (Tom Lane)
</p></li><li class="listitem"><p> Fix <span class="quote">“<span class="quote">could not devise a query plan for the given query</span>”</span>
planner failure for some cases involving nested <code class="literal">UNION
ALL</code> inside a lateral subquery (Tom Lane)
</p></li><li class="listitem"><p> Allow functional dependency statistics to be used for boolean columns
(Tom Lane)
</p><p> Previously, although extended statistics could be declared and
collected on boolean columns, the planner failed to apply them.
</p></li><li class="listitem"><p> Avoid underestimating the number of groups emitted by subqueries
containing set-returning functions in their grouping columns (Tom Lane)
</p><p> Cases similar to <code class="literal">SELECT DISTINCT unnest(foo)</code> got a
lower output rowcount estimate in 10.0 than they did in earlier
releases, possibly resulting in unfavorable plan choices. Restore the
prior estimation behavior.
</p></li><li class="listitem"><p> Fix use of triggers in logical replication workers (Petr Jelinek)
</p></li><li class="listitem"><p> Fix logical decoding to correctly clean up disk files for crashed
transactions (Atsushi Torikoshi)
</p><p> Logical decoding may spill WAL records to disk for transactions
generating many WAL records. Normally these files are cleaned up
after the transaction's commit or abort record arrives; but if
no such record is ever seen, the removal code misbehaved.
</p></li><li class="listitem"><p> Fix walsender timeout failure and failure to respond to interrupts
when processing a large transaction (Petr Jelinek)
</p></li><li class="listitem"><p> Fix race condition during replication origin drop that could allow the
dropping process to wait indefinitely (Tom Lane)
</p></li><li class="listitem"><p> Allow members of the <code class="literal">pg_read_all_stats</code> role to see
walsender statistics in the <code class="structname">pg_stat_replication</code>
view (Feike Steenbergen)
</p></li><li class="listitem"><p> Show walsenders that are sending base backups as active in
the <code class="structname">pg_stat_activity</code> view (Magnus Hagander)
</p></li><li class="listitem"><p> Fix reporting of <code class="literal">scram-sha-256</code> authentication
method in the <code class="structname">pg_hba_file_rules</code> view
(Michael Paquier)
</p><p> Previously this was printed as <code class="literal">scram-sha256</code>,
possibly confusing users as to the correct spelling.
</p></li><li class="listitem"><p> Fix <code class="function">has_sequence_privilege()</code> to
support <code class="literal">WITH GRANT OPTION</code> tests,
as other privilege-testing functions do (Joe Conway)
</p></li><li class="listitem"><p> In databases using UTF8 encoding, ignore any XML declaration that
asserts a different encoding (Pavel Stehule, Noah Misch)
</p><p> We always store XML strings in the database encoding, so allowing
libxml to act on a declaration of another encoding gave wrong results.
In encodings other than UTF8, we don't promise to support non-ASCII
XML data anyway, so retain the previous behavior for bug compatibility.
This change affects only <code class="function">xpath()</code> and related
functions; other XML code paths already acted this way.
</p></li><li class="listitem"><p> Provide for forward compatibility with future minor protocol versions
(Robert Haas, Badrul Chowdhury)
</p><p> Up to now, <span class="productname">PostgreSQL</span> servers simply
rejected requests to use protocol versions newer than 3.0, so that
there was no functional difference between the major and minor parts
of the protocol version number. Allow clients to request versions 3.x
without failing, sending back a message showing that the server only
understands 3.0. This makes no difference at the moment, but
back-patching this change should allow speedier introduction of future
minor protocol upgrades.
</p></li><li class="listitem"><p> Allow a client that supports SCRAM channel binding (such as v11 or
later <span class="application">libpq</span>) to connect to a v10 server
(Michael Paquier)
</p><p> v10 does not have this feature, and the connection-time negotiation
about whether to use it was done incorrectly.
</p></li><li class="listitem"><p> Avoid live-lock in <code class="function">ConditionVariableBroadcast()</code>
(Tom Lane, Thomas Munro)
</p><p> Given repeatedly-unlucky timing, a process attempting to awaken all
waiters for a condition variable could loop indefinitely. Due to the
limited usage of condition variables in v10, this affects only
parallel index scans and some operations on replication slots.
</p></li><li class="listitem"><p> Clean up waits for condition variables correctly during subtransaction
abort (Robert Haas)
</p></li><li class="listitem"><p> Ensure that child processes that are waiting for a condition variable
will exit promptly if the postmaster process dies (Tom Lane)
</p></li><li class="listitem"><p> Fix crashes in parallel queries using more than one Gather node
(Thomas Munro)
</p></li><li class="listitem"><p> Fix hang in parallel index scan when processing a deleted or half-dead
index page (Amit Kapila)
</p></li><li class="listitem"><p> Avoid crash if parallel bitmap heap scan is unable to allocate a
shared memory segment (Robert Haas)
</p></li><li class="listitem"><p> Cope with failure to start a parallel worker process
(Amit Kapila, Robert Haas)
</p><p> Parallel query previously tended to hang indefinitely if a worker
could not be started, as the result of <code class="literal">fork()</code>
failure or other low-probability problems.
</p></li><li class="listitem"><p> Avoid unnecessary failure when no parallel workers can be obtained
during parallel query startup (Robert Haas)
</p></li><li class="listitem"><p> Fix collection of <code class="command">EXPLAIN</code> statistics from parallel
workers (Amit Kapila, Thomas Munro)
</p></li><li class="listitem"><p> Ensure that query strings passed to parallel workers are correctly
null-terminated (Thomas Munro)
</p><p> This prevents emitting garbage in postmaster log output from such
workers.
</p></li><li class="listitem"><p> Avoid unsafe alignment assumptions when working
with <code class="type">__int128</code> (Tom Lane)
</p><p> Typically, compilers assume that <code class="type">__int128</code> variables are
aligned on 16-byte boundaries, but our memory allocation
infrastructure isn't prepared to guarantee that, and increasing the
setting of MAXALIGN seems infeasible for multiple reasons. Adjust the
code to allow use of <code class="type">__int128</code> only when we can tell the
compiler to assume lesser alignment. The only known symptom of this
problem so far is crashes in some parallel aggregation queries.
</p></li><li class="listitem"><p> Prevent stack-overflow crashes when planning extremely deeply
nested set operations
(<code class="literal">UNION</code>/<code class="literal">INTERSECT</code>/<code class="literal">EXCEPT</code>)
(Tom Lane)
</p></li><li class="listitem"><p> Avoid crash during an EvalPlanQual recheck of an indexscan that is the
inner child of a merge join (Tom Lane)
</p><p> This could only happen during an update or <code class="command">SELECT FOR
UPDATE</code> of a join, when there is a concurrent update of some
selected row.
</p></li><li class="listitem"><p> Fix crash in autovacuum when extended statistics are defined
for a table but can't be computed (Álvaro Herrera)
</p></li><li class="listitem"><p> Fix null-pointer crashes for some types of LDAP URLs appearing
in <code class="filename">pg_hba.conf</code> (Thomas Munro)
</p></li><li class="listitem"><p> Prevent out-of-memory failures due to excessive growth of simple hash
tables (Tomas Vondra, Andres Freund)
</p></li><li class="listitem"><p> Fix sample <code class="function">INSTR()</code> functions in the PL/pgSQL
documentation (Yugo Nagata, Tom Lane)
</p><p> These functions are stated to
be <span class="trademark">Oracle</span>® compatible, but
they weren't exactly. In particular, there was a discrepancy in the
interpretation of a negative third parameter: Oracle thinks that a
negative value indicates the last place where the target substring can
begin, whereas our functions took it as the last place where the
target can end. Also, Oracle throws an error for a zero or negative
fourth parameter, whereas our functions returned zero.
</p><p> The sample code has been adjusted to match Oracle's behavior more
precisely. Users who have copied this code into their applications
may wish to update their copies.
</p></li><li class="listitem"><p> Fix <span class="application">pg_dump</span> to make ACL (permissions),
comment, and security label entries reliably identifiable in archive
output formats (Tom Lane)
</p><p> The <span class="quote">“<span class="quote">tag</span>”</span> portion of an ACL archive entry was usually
just the name of the associated object. Make it start with the object
type instead, bringing ACLs into line with the convention already used
for comment and security label archive entries. Also, fix the
comment and security label entries for the whole database, if present,
to make their tags start with <code class="literal">DATABASE</code> so that they
also follow this convention. This prevents false matches in code that
tries to identify large-object-related entries by seeing if the tag
starts with <code class="literal">LARGE OBJECT</code>. That could have resulted
in misclassifying entries as data rather than schema, with undesirable
results in a schema-only or data-only dump.
</p><p> Note that this change has user-visible results in the output
of <code class="command">pg_restore --list</code>.
</p></li><li class="listitem"><p> Rename <span class="application">pg_rewind</span>'s
<code class="function">copy_file_range</code> function to avoid conflict
with new Linux system call of that name (Andres Freund)
</p><p> This change prevents build failures with newer glibc versions.
</p></li><li class="listitem"><p> In <span class="application">ecpg</span>, detect indicator arrays that do
not have the correct length and report an error (David Rader)
</p></li><li class="listitem"><p> Change the behavior of <code class="filename">contrib/cube</code>'s
<code class="type">cube</code> <code class="literal">~></code> <code class="type">int</code>
operator to make it compatible with KNN search (Alexander Korotkov)
</p><p> The meaning of the second argument (the dimension selector) has been
changed to make it predictable which value is selected even when
dealing with cubes of varying dimensionalities.
</p><p> This is an incompatible change, but since the point of the operator
was to be used in KNN searches, it seems rather useless as-is.
After installing this update, any expression indexes or materialized
views using this operator will need to be reindexed/refreshed.
</p></li><li class="listitem"><p> Avoid triggering a libc assertion
in <code class="filename">contrib/hstore</code>, due to use
of <code class="function">memcpy()</code> with equal source and destination
pointers (Tomas Vondra)
</p></li><li class="listitem"><p> Fix incorrect display of tuples' null bitmaps
in <code class="filename">contrib/pageinspect</code> (Maksim Milyutin)
</p></li><li class="listitem"><p> Fix incorrect output from <code class="filename">contrib/pageinspect</code>'s
<code class="function">hash_page_items()</code> function (Masahiko Sawada)
</p></li><li class="listitem"><p> In <code class="filename">contrib/postgres_fdw</code>, avoid
<span class="quote">“<span class="quote">outer pathkeys do not match mergeclauses</span>”</span>
planner error when constructing a plan involving a remote join
(Robert Haas)
</p></li><li class="listitem"><p> In <code class="filename">contrib/postgres_fdw</code>, avoid planner failure
when there are duplicate <code class="literal">GROUP BY</code> entries
(Jeevan Chalke)
</p></li><li class="listitem"><p> Provide modern examples of how to auto-start Postgres on macOS
(Tom Lane)
</p><p> The scripts in <code class="filename">contrib/start-scripts/osx</code> use
infrastructure that's been deprecated for over a decade, and which no
longer works at all in macOS releases of the last couple of years.
Add a new subdirectory <code class="filename">contrib/start-scripts/macos</code>
containing scripts that use the newer <span class="application">launchd</span>
infrastructure.
</p></li><li class="listitem"><p> Fix incorrect selection of configuration-specific libraries for
OpenSSL on Windows (Andrew Dunstan)
</p></li><li class="listitem"><p> Support linking to MinGW-built versions of libperl (Noah Misch)
</p><p> This allows building PL/Perl with some common Perl distributions for
Windows.
</p></li><li class="listitem"><p> Fix MSVC build to test whether 32-bit libperl
needs <code class="literal">-D_USE_32BIT_TIME_T</code> (Noah Misch)
</p><p> Available Perl distributions are inconsistent about what they expect,
and lack any reliable means of reporting it, so resort to a build-time
test on what the library being used actually does.
</p></li><li class="listitem"><p> On Windows, install the crash dump handler earlier in postmaster
startup (Takayuki Tsunakawa)
</p><p> This may allow collection of a core dump for some early-startup
failures that did not produce a dump before.
</p></li><li class="listitem"><p> On Windows, avoid encoding-conversion-related crashes when emitting
messages very early in postmaster startup (Takayuki Tsunakawa)
</p></li><li class="listitem"><p> Use our existing Motorola 68K spinlock code on OpenBSD as
well as NetBSD (David Carlier)
</p></li><li class="listitem"><p> Add support for spinlocks on Motorola 88K (David Carlier)
</p></li><li class="listitem"><p> Update time zone data files to <span class="application">tzdata</span>
release 2018c for DST law changes in Brazil, Sao Tome and Principe,
plus historical corrections for Bolivia, Japan, and South Sudan.
The <code class="literal">US/Pacific-New</code> zone has been removed (it was
only an alias for <code class="literal">America/Los_Angeles</code> anyway).
</p></li></ul></div></div></div><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navfooter"><hr></hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="release-10-3.html" title="E.21. Release 10.3">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-10-1.html" title="E.23. Release 10.1">Next</a></td></tr><tr><td width="40%" align="left" valign="top">E.21. Release 10.3 </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 10.23 Documentation">Home</a></td><td width="40%" align="right" valign="top"> E.23. Release 10.1</td></tr></table></div></body></html>