PostgreSQL 2008年5月第1周新闻综述 -- 2008/05/04

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五月份的补丁提交审核循环又开始了，（经过前段时间的改进）和大家想象的一下，新的循环将比三月份运行得更加顺畅。

[编辑] PostgreSQL相关软件新闻

Benetl 1.8 版本发布（类似导入导出工具，主要处理csv/txt/xls文件），详情可浏览：http://www.benetl.net/

Continuent uni/cluster （ PostgreSQL） 2008 版本发布，详情可浏览：http://www.continuent.com/

DBD::Pg 2.6.4 模块发布，详情可浏览：http://search.cpan.org/dist/DBD-Pg/

check_postgres 1.5.2 版本发布，详情可浏览：http://bucardo.org/check_postgres/

PL/LOLCODE 0.2b1版本发布，详情可浏览：http://pgfoundry.org/projects/pllolcode/

[编辑] PostgreSQL 五月相关工作机会

详情可浏览：http://archives.postgresql.org/pgsql-jobs/2008-05/threads.php

[编辑] PostgreSQL各地新闻

奥斯汀的PostgreSQL用户协会将在5/6下午6点举行会议，地点在SUN公司在Riata的办公室，详情可浏览：http://pugs.postgresql.org/node/388

巴尔的摩/华盛顿区的PostgreSQL用户协会将在5/14星期三举行他们第一次会议，地点是在OmniTI公司的哥伦比亚总部大楼，详情可浏览：http://lethargy.org/~jesus/categories/6-BWPUG

PGCon 2008年度大会将于05/20--23在渥太华举行，详情可浏览：http://www.pgcon.org/2008/

希腊PostgreSQL用户协会将在第三届希腊开源软件大会上设立一个展位，本次大会将于5/27--28在NTUA，Athens举行，详情可浏览：http://www.postgresql.gr/

洛杉矶PostgreSQL用户协会将于5/30在Cal Poly举行用户大会，Keith Larson将发表有关可更新视图的演讲，详情可浏览：http://pugs.postgresql.org/node/390

PostgreSQL日将在开源大会(OSCON)之前于波特兰举行，详情可浏览：http://pugs.postgresql.org/taxonomy/term/53

犹他州2008开源软件大会自6/1起开放注册，这个第二次的年度大会将于2008/08/28--30日在Salt Lake举行，详情可浏览：http://2008.utosc.com/

[编辑] PostgreSQL其他新闻

PostgreSQL网志站点：http://www.planetpostgresql.org/

PostgreSQL技巧站点，目前主要为一些存档文章和很少的更新：http://www.varlena.com/GeneralBits/

PostgreSQL本周新闻综述是由David Fetter带给我们大家的，谢谢他的工作。

如果您想提交一些新闻或是软件发布稿等内容可在每周星期天的下午3:00（太平洋时区）前，英文版的内容可发送至david@fetter.org，德文版本的内容可发送至pwn@pgug.de，意大利语版本的内容可发至pwn@itpug.org

[编辑] 本周打入系统的补丁

Alvaro Herrera committed:

- Add generate_subscripts, a series-generation function which

generates an array's subscripts.  Pavel Stehule, some
editorialization by me.

- Bump the catversion for the previous patch.

- Fix volatility marking for the generate_series and

generate_subscripts families of functions.

- Remove typename from A_Const. Brendan Jurd, minor editorialization

by me.

- Fix REASSIGN OWNED so that it works on procedural languages too.

The capability for changing language owners is new in 8.3, so that's
how far back this needs to be backpatched.  Per bug #4132 by Kirill
Simonov.

- In pgsql/doc/src/sgml/ref/alter_role.sgml, add example showing how

to remove a password from a role.  Andreas Scherbaum.

Tom Lane committed:

- Fix broken configure test for libxslt: it was probing for

xsltLibxmlVersion, which is a global variable not a function, and so
the probe failed on machines where the linker makes a distinction
(cf. Red Hat bug #444317).  Probe for an actual function instead.

- Increase the statement_timeout value used in the prepared_xacts

regression test.  We have seen some buildfarm failures that seem to
be due to this limit being unexpectedly exceeded when the machine is
under load.

- Some minor further cleanup around A_Const. Don't attach a typecast

in makeFloatConst, and avoid "manual" construction of A_Const nodes
in grammar productions, in favor of using makeXXXConst subroutines.

- In pgsql/src/backend/executor/nodeTidscan.c, fix nodeTidscan.c to

not trigger an error if the block number portion of a user-supplied
TID is out of range for the relation.  This is needed to preserve
compatibility with our pre-8.3 behavior, and it is sensible anyway
since if the query were implemented by brute force rather than
optimized into a TidScan, the behavior for a non-existent TID would
be zero rows out, never an error.  Per gripe from Gurjeet Singh.

- Make the minimum allowed value of work_mem be 64KB always, rather

than having it vary with BLCKSZ as before.  This agrees with what
the documentation says, and avoids a regression test problem when
BLCKSZ is larger than default.  Per recent discussion.

- Add SGT (Singapore time) to the default list of known timezone

abbreviations.  It doesn't conflict with any other abbreviation so
there seems no reason not to include it.  Per a recent gripe.

- Remove the recently added USE_SEGMENTED_FILES option, and indeed

remove all support for a nonsegmented mode from md.c.  Per recent
discussions, there doesn't seem to be much value in a "never
segment" option as opposed to segmenting with a suitably large
segment size.  So instead provide a configure-time switch to set the
desired segment size in units of gigabytes.  While at it, expose a
configure switch for BLCKSZ as well.  Zdenek Kotala

- In pgsql/src/include/pg_config.h.win32, sigh ... pg_config.h.win32

needs to define BLCKSZ and RELSEG_SIZE now.

- Extend yesterday's patch making BLCKSZ and RELSEG_SIZE configurable

to also let XLOG_BLCKSZ and XLOG_SEG_SIZE be set via configure.  Per
a proposal by Mark Wong, though I thought it better to call the
switches after "wal" rather than "xlog".

- Allow the planner's estimate of the fraction of a cursor's rows that

will be retrieved to be controlled through a GUC variable.  Robert
Hell

- In pgsql/doc/src/sgml/ref/psql-ref.sgml, update documentation for

psql relation-size-in-\dt+ patch.

- Support RETURN QUERY EXECUTE in plpgsql. Pavel Stehule.

- Fix plpython to not get totally confused by OUT arguments. (It

still doesn't support multiple OUT arguments, though.) Hannu Krosing

- In pgsql/src/backend/utils/adt/ruleutils.c, the 8.2 patch that added

support for an alias on the target table of UPDATE/DELETE forgot to
teach ruleutils.c to display the alias.  Per bug #4141 from Mathias
Seiler.

- Use new cstring/text conversion functions in some additional places.

These changes assume that the varchar and xml data types are
represented the same as text.  (I did not, however, accept the
portions of the proposed patch that wanted to assume bytea is the
same as text --- tgl.) Brendan Jurd

- Add pg_conf_load_time() function to report when the Postgres

configuration files were last loaded.  George Gensure

- Add timestamp and timestamptz versions of generate_series().

Hitoshi Harada

Bruce Momjian committed:

- Update TODO comment for 8.4: '#A hyphen, "-", marks changes that

will appear in the upcoming 8.4 release.#'

Peter Eisentraut committed:

- In psql, one-letter backslash commands now need a space before the

first argument.  This has been the only documented and encouraged
syntax for a long time, and with extension facilities such as
aliases being proposed, it is a good time to clean up the legacy
syntax a bit.  Bernd Helmle.

- In pgsql/src/backend/utils/Gen_fmgrtab.sh, make the AWK default

value also take effect if $AWK is an empty string.

Heikki Linnakangas committed:

- In pgsql/src/bin/psql/describe.c, show relation size in verbose

(e.g. \d+) output.  Dickson S. Guedes.

Andrew Dunstan committed:

- Provide for MSVC config equivalents of recently added configure

options. Remove any hardcoding of those options. Along the way,
reorder the expression used to calculate RELSEG_SIZE to make it
slightly clearer. For now wal_segsize is only allowed to have a
value of 1 on Windows - we can relax that when we get full large
file support in the backend.

- Disable statement timeouts while making or restoring dumps. Joshua

Drake.

- In pgsql/src/bin/pg_dump/pg_backup_archiver.c, place statement

timeout more appropriately, per gripe from Tom Lane.

- In pgsql/src/bin/pg_dump/pg_backup_archiver.c, add ; missing due to

my carelessness.

- Show enum values in psql's \dT+. David Fetter.

- Display ACLS using multiple lines for psql's \z. Brendan Jurd.

- In pgsql/doc/src/sgml/ref/psql-ref.sgml, document extra information

provided by psql's \dT+.

[编辑] Rejected Patches (for now)

Sergey Zubkovsky's patch to patch pg_total_relation_size() for Windows. Magnus Hagander had already committed a similar patch.

[编辑] Pending Patches

Bruce Momjian sent in another revision of Bryce Nesbitt's patch to wrap psql output at window width.

Heikki Linnakangas sent in a WIP patch to implement map forks.

George Gensure sent in two revisions of a patch to add pg_conf_load_time().

Merlin Moncure sent in another revision of the libpq object hooks patch.

Magnus Hagander sent in a patch to add functions which make it possible to implement pg_stat_activity as a SRF.

Andreas (ads) Scherbaum sent in another revision of his patch to implement "CREATE OR REPLACE LANGUAGE."

Dave Page sent in three revisions of a patch which implements pg_get_keywords().

Tom Lane sent in a revised version of ITAGAKI Takahiro's patch to sort writes during checkpoints.