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Preliminary release notes for 8.5alpha2

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Peter Eisentraut 2009-10-20 19:52:58 +00:00
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<!-- $PostgreSQL: pgsql/doc/src/sgml/release-8.5.sgml,v 1.4 2009/08/19 08:18:48 petere Exp $ --> <!-- $PostgreSQL: pgsql/doc/src/sgml/release-8.5.sgml,v 1.5 2009/10/20 19:52:58 petere Exp $ -->
<sect1 id="release-8.5"> <sect1 id="release-8-5">
<title>Release 8.5alpha1</title> <title>Release 8.5alpha2</title>
<sect2> <sect2>
<title>Overview</title> <title>Overview</title>
<para> <para>
@ -32,6 +32,11 @@
using those if you are looking for bug-fix-only upgrades for your using those if you are looking for bug-fix-only upgrades for your
current installations. current installations.
</para> </para>
<para>
The release notes are cumulative over all alpha releases. Items
that are new in the latest alpha release
are <emphasis>emphasized</emphasis>.
</para>
</sect2> </sect2>
<sect2> <sect2>
<title>Migration</title> <title>Migration</title>
@ -52,6 +57,68 @@
<sect3> <sect3>
<title>SQL Features</title> <title>SQL Features</title>
<itemizedlist> <itemizedlist>
<listitem override="box">
<para>
<emphasis>Modify the definition of window-function PARTITION
BY and ORDER BY clauses so that their elements are always
taken as simple expressions over the query's input
columns.</>
</para>
</listitem>
<listitem>
<para>
<emphasis>Fix bug with WITH RECURSIVE immediately inside WITH
RECURSIVE.</>
</para>
</listitem>
<listitem>
<para>
<emphasis>Define a new, more extensible syntax for COPY options.</>
</para>
</listitem>
<listitem>
<para>
<emphasis>Add ALTER DEFAULT PRIVILEGES command, which allows
users to adjust the privileges that will be applied to
subsequently-created objects.</>
</para>
</listitem>
<listitem>
<para>
<emphasis>Support use of function argument names to identify which
actual arguments match which function parameters. The syntax
uses AS, for example funcname(value AS arg1, anothervalue AS
arg2).</>
</para>
</listitem>
<listitem>
<para>
<emphasis>Add CREATE LIKE INCLUDING COMMENTS and STORAGE, and INCLUDING
ALL shortcut.</>
</para>
</listitem>
<listitem>
<para>
<emphasis>Add GRANT/REVOKE ON ALL TABLES/SEQUENCES/FUNCTIONS IN SCHEMA.</>
</para>
</listitem>
<listitem>
<para>
<emphasis>Add SQL-compliant triggers on columns, ie fire only if
certain columns are named in the UPDATE's SET list.</>
</para>
</listitem>
<listitem>
<para>
<emphasis>Add surrogate pair support for U&amp; string and identifier
syntax.</>
</para>
</listitem>
<listitem>
<para>
<emphasis>Add Unicode escapes in E'...' strings.</>
</para>
</listitem>
<listitem> <listitem>
<para> <para>
DROP COLUMN and DROP CONSTRAINT now support an IF EXISTS clause so DROP COLUMN and DROP CONSTRAINT now support an IF EXISTS clause so
@ -67,19 +134,19 @@
</listitem> </listitem>
<listitem> <listitem>
<para> <para>
Allows parentheses around the query expression that follows a WITH Allow parentheses around the query expression that follows a WITH
clause. clause.
</para> </para>
</listitem> </listitem>
<listitem> <listitem>
<para> <para>
INFORMATION_SCHEMA, a catalog of standard views of database INFORMATION_SCHEMA, a catalog of standard views of database
objects, has been updated to the SQL:2008 ANSI/ISO standard. objects, has been updated to the SQL:2008 standard.
</para> </para>
</listitem> </listitem>
<listitem> <listitem>
<para> <para>
Changes character_octet_length to more sensible values in Change character_octet_length to more sensible values in
INFORMATION_SCHEMA. INFORMATION_SCHEMA.
</para> </para>
</listitem> </listitem>
@ -94,6 +161,19 @@
<sect3> <sect3>
<title>Performance</title> <title>Performance</title>
<itemizedlist> <itemizedlist>
<listitem>
<para>
<emphasis>Make TRUNCATE do truncate-in-place when processing
a relation that was created or previously truncated in the
current (sub)transaction.</>
</para>
</listitem>
<listitem>
<para>
<emphasis>Implement &quot;join removal&quot; for cases where the inner side
of a left join is unique and is not referenced above the join.</>
</para>
</listitem>
<listitem> <listitem>
<para> <para>
EXPLAIN allows output of plans in XML or JSON format for automated EXPLAIN allows output of plans in XML or JSON format for automated
@ -116,7 +196,7 @@
</listitem> </listitem>
<listitem> <listitem>
<para> <para>
Makes GEQO's planning deterministic by having it start from a Make GEQO's planning deterministic by having it start from a
predictable random number seed each time. predictable random number seed each time.
</para> </para>
</listitem> </listitem>
@ -153,6 +233,31 @@
<sect3> <sect3>
<title>Administration and Monitoring</title> <title>Administration and Monitoring</title>
<itemizedlist> <itemizedlist>
<listitem>
<para>
<emphasis>Add a Boolean server configuration parameter
&quot;bonjour&quot; to control whether a Bonjour-enabled
build actually attempts to advertise itself via Bonjour.</>
</para>
</listitem>
<listitem>
<para>
<emphasis>When reloading postgresql.conf, log what parameters actually
changed.</>
</para>
</listitem>
<listitem>
<para>
<emphasis>Make it possibly to specify server configuration parameters
per user and per database. psql has gained a drds command to
display the settings.</>
</para>
</listitem>
<listitem>
<para>
<emphasis>Allow the collection of statistics on sequences.</>
</para>
</listitem>
<listitem> <listitem>
<para> <para>
Add the ability to include the SQLSTATE error code of any error Add the ability to include the SQLSTATE error code of any error
@ -169,9 +274,28 @@
</listitem> </listitem>
</itemizedlist> </itemizedlist>
</sect3> </sect3>
<sect3>
<title>Server Configuration</title>
<itemizedlist>
<listitem>
<para>
<emphasis>Increase the maximum value of extra_float_digits to
3, and have pg_dump use that value when the backend is new
enough to allow it, because it is possible to need 3 extra
digits for float4 values (but not for float8 values).</>
</para>
</listitem>
</itemizedlist>
</sect3>
<sect3> <sect3>
<title>Security</title> <title>Security</title>
<itemizedlist> <itemizedlist>
<listitem>
<para>
<emphasis>Support &quot;samehost&quot; and &quot;samenet&quot; specifications
in pg_hba.conf.</emphasis>
</para>
</listitem>
<listitem> <listitem>
<para> <para>
New has_sequence_privilege() functions allow you to check sequence New has_sequence_privilege() functions allow you to check sequence
@ -183,6 +307,12 @@
<sect3> <sect3>
<title>Built-In Functions</title> <title>Built-In Functions</title>
<itemizedlist> <itemizedlist>
<listitem>
<para>
<emphasis>Support POSIX-compatible interpretation of ? as well as {m,n}
and related constructs in SIMILAR TO, per SQL:2008.</>
</para>
</listitem>
<listitem> <listitem>
<para> <para>
The to_char() formatting functions now supports EEEE (scientific The to_char() formatting functions now supports EEEE (scientific
@ -206,13 +336,24 @@
</itemizedlist> </itemizedlist>
</sect3> </sect3>
<sect3> <sect3>
<title>Datatypes</title> <title>Data Types</title>
<itemizedlist> <itemizedlist>
<listitem>
<para>
<emphasis>Fix encoding handling in binary input function of xml type.</>
</para>
</listitem>
<listitem>
<para>
<emphasis>Tighten binary receive functions so that they reject values
that the text input functions don't accept either.</>
</para>
</listitem>
<listitem> <listitem>
<para> <para>
New hex-string input and output format options for type BYTEA. Hex New hex-string input and output format options for type bytea. Hex
output format is enabled by default, which is an INCOMPATIBLE output format is enabled by default, which is an incompatible
CHANGE. See the new bytea_output parameter if you need to restore change. See the new bytea_output parameter if you need to restore
compatibility. compatibility.
</para> </para>
</listitem> </listitem>
@ -227,14 +368,28 @@
<sect3> <sect3>
<title>Server Tools</title> <title>Server Tools</title>
<itemizedlist> <itemizedlist>
<listitem> <listitem>
<para>
<emphasis>It is now reasonably safe to use pg_ctl to start
the postmaster from a boot-time script.</emphasis>
</para>
</listitem>
<listitem>
<para>
<emphasis>Remove the use of the flat files pg_auth and
pg_database. (At least pgbouncer currently suggests referring
to the pg_auth file for its user database. Such schemes will
no longer work.)</emphasis>
</para>
</listitem>
<listitem>
<para> <para>
pg_dump/pg_restore --clean now drops large objects. pg_dump/pg_restore --clean now drops large objects.
</para> </para>
</listitem> </listitem>
<listitem> <listitem>
<para> <para>
Modifies parallel pg_restore ordering logic to avoid a potential Modify parallel pg_restore ordering logic to avoid a potential
O(N^2) slowdown for some complex databases. O(N^2) slowdown for some complex databases.
</para> </para>
</listitem> </listitem>
@ -243,6 +398,21 @@
<sect3> <sect3>
<title>psql</title> <title>psql</title>
<itemizedlist> <itemizedlist>
<listitem>
<para>
<emphasis>Implement significantly saner behavior when two or
more psql sessions overlap in their use of the history file.</>
</para>
</listitem>
<listitem>
<para>
<emphasis>Add &quot;pset linestyle ascii/unicode&quot; option to psql,
allowing our traditional ASCII-art style of table output to
be upgraded to use Unicode box drawing characters if
desired. By default, psql will use the Unicode characters
whenever client_encoding is UTF8.</>
</para>
</listitem>
<listitem> <listitem>
<para> <para>
Have \d show child tables that inherit from the specified parent Have \d show child tables that inherit from the specified parent
@ -258,6 +428,52 @@
<sect3> <sect3>
<title>Procedural Languages</title> <title>Procedural Languages</title>
<itemizedlist> <itemizedlist>
<listitem>
<para>
<emphasis>Add DO statement to support execution of procedural language
code without having to create a function for it.</>
</para>
</listitem>
<listitem>
<para>
<emphasis>Fix/improve bytea and boolean support in PL/Python. Data type
conversion into and out of PL/Python previously went through
an intermediate string representation, which caused various
discrepancies especially with bytea and boolean data. This is
now fixed by converting the values directly.</>
</para>
</listitem>
<listitem>
<para>
<emphasis>PL/Python now accepts Unicode objects where it previously
only accepted string objects (for example, as return
value). Unicode objects are converted to the PostgreSQL
server encoding as necessary.</>
</para>
</listitem>
<listitem>
<para>
<emphasis>Improve error context reporting in PL/Perl, for
easier debugging.</>
</para>
</listitem>
<listitem>
<para>
<emphasis>Allow plpgsql IN parameters to be assigned to.</>
</para>
</listitem>
<listitem>
<para>
<emphasis>Convert a Perl array to a PostgreSQL array when returned by
set-returning functions as well as non-SRFs.</>
</para>
</listitem>
<listitem>
<para>
<emphasis>Allow MOVE FORWARD n, MOVE BACKWARD n, MOVE FORWARD ALL, MOVE
BACKWARD ALL in PL/pgSQL.</>
</para>
</listitem>
<listitem> <listitem>
<para> <para>
PL/pgSQL functions can now better cope with row types PL/pgSQL functions can now better cope with row types
@ -266,13 +482,13 @@
</listitem> </listitem>
<listitem> <listitem>
<para> <para>
Improves error context reporting in PL/Python, for easier Improve error context reporting in PL/Python, for easier
debugging. debugging.
</para> </para>
</listitem> </listitem>
<listitem> <listitem>
<para> <para>
Greatly expands the regression testing for PL/Python. Greatly expand the regression testing for PL/Python.
</para> </para>
</listitem> </listitem>
</itemizedlist> </itemizedlist>
@ -280,6 +496,11 @@
<sect3> <sect3>
<title>Additional Supplied Modules</title> <title>Additional Supplied Modules</title>
<itemizedlist> <itemizedlist>
<listitem>
<para>
<emphasis>Assorted improvements in contrib/hstore.</>
</para>
</listitem>
<listitem> <listitem>
<para> <para>
pgbench is now multi-threaded, allowing it to use multiple CPU's pgbench is now multi-threaded, allowing it to use multiple CPU's
@ -306,6 +527,27 @@
</listitem> </listitem>
</itemizedlist> </itemizedlist>
</sect3> </sect3>
<sect3>
<title>Programming Tools</title>
<itemizedlist>
<listitem>
<para>
<emphasis>Add ECPG function that returns the current transaction status.</>
</para>
</listitem>
<listitem>
<para>
<emphasis>Make ECPG more robust against applications freeing strings.</>
</para>
</listitem>
<listitem>
<para>
<emphasis>Make libpq reject non-numeric and out-of-range port numbers with a
suitable error message.</>
</para>
</listitem>
</itemizedlist>
</sect3>
<sect3> <sect3>
<title>Development</title> <title>Development</title>
<itemizedlist> <itemizedlist>
@ -331,7 +573,33 @@
<sect3> <sect3>
<title>Ports</title> <title>Ports</title>
<itemizedlist> <itemizedlist>
<listitem> <listitem>
<para>
<emphasis>Change the WIN32 API version to be 5.01 (Windows XP), to
bring in the proper IPv6 headers in newer SDKs.</>
</para>
</listitem>
<listitem>
<para>
<emphasis>Write to the Windows eventlog in UTF-16, converting the
message encoding as necessary.</>
</para>
</listitem>
<listitem>
<para>
<emphasis>Replace use of the long-deprecated Bonjour API
DNSServiceRegistrationCreate with the not-so-deprecated
DNSServiceRegister. The new code will fail on Mac OS X
releases before 10.3.</>
</para>
</listitem>
<listitem>
<para>
<emphasis>Install a hopefully-temporary workaround for Mac OS X Snow Leopard
readdir() bug.</>
</para>
</listitem>
<listitem>
<para> <para>
Reserve the shared memory region during backend startup on Windows, Reserve the shared memory region during backend startup on Windows,
so that memory allocated by starting third party DLLs doesn't end so that memory allocated by starting third party DLLs doesn't end
@ -350,6 +618,28 @@
<sect3> <sect3>
<title>Source code, build options</title> <title>Source code, build options</title>
<itemizedlist> <itemizedlist>
<listitem>
<para>
<emphasis>Fix inclusions of readline/editline header files so that we
only attempt to #include the version of history.h that is in
the same directory as the readline.h we are using. This
avoids problems in some scenarios where both readline and
editline are installed.</>
</para>
</listitem>
<listitem>
<para>
<emphasis>Derived files that are shipped in the distribution used to be
built in the source directory even for out-of-tree
builds. They are now also built in the build tree. This
should be more convenient for certain developers' workflows.</>
</para>
</listitem>
<listitem>
<para>
<emphasis>Translations were updated.</>
</para>
</listitem>
<listitem> <listitem>
<para> <para>
Upgrade to Autoconf 2.63 (not relevant to users of distribution Upgrade to Autoconf 2.63 (not relevant to users of distribution
@ -387,13 +677,6 @@
will let it be used directly by PL/pgSQL. will let it be used directly by PL/pgSQL.
</para> </para>
</listitem> </listitem>
<listitem>
<para>
Fix backend startup to not depend on the flat-file copy of
pg_database. This is a first step towards eliminating the flat
files altogether.
</para>
</listitem>
</itemizedlist> </itemizedlist>
</sect3> </sect3>
</sect2> </sect2>