== Notiziario settimanale PostgreSQL - 19 aprile 2009 ==

(Traduzione parziale in lingua italiana delle PostgreSQL Weekly News a
cura di Gianni Ciolli <gianni(dot)ciolli(at)2ndquadrant(dot)it>)

Rilasciata la versione 8.4 beta 1. Partecipate al test!
http://www.postgresql.org/developer/beta

È disponibile il video "PostgreSQL in the Cloud". Grazie a Christophe
Pettus per le riprese e a Dirk Jagdmann per aver realizzato lo
streaming live durante l'evento.
http://media.postgresql.org/sfpug/sfpug-cloud-20090408.mov
http://www.vimeo.com/4144396

== Novità sul prodotto PostgreSQL ==

Rilasciata la versione 3.1.1 di Archiveopteryx, un gestore di email
basato su PostgreSQL.
http://www.archiveopteryx.org/3.1.1

Rilasciata la versione 2.7 di Benetl 2.7, un tool ETL per files che
usa PostgreSQL.
http://www.benetl.net

Rilasciata la versione 2.13.0 di DBD::Pg, un connettore Perl per
PostgreSQL.
http://search.cpan.org/dist/DBD-Pg/

== La novità della settimana di PostgreSQL 8.4 ==

Autotuning FSM: Ti piacevano i parametri GUC max_fsm_relations e
max_fsm_pages? Beh, peccato, non ci sono più. Grazie a Heikki
Linnakangas adesso quei parametri si regolano da soli.

== Il suggerimento della settimana ==

PostgreSQL supporta lo standard SQL INFORMATION_SCHEMA, che contiene
informazioni su tabelle, colonne, vincoli e viste in un formato
tabellare standard che è lo stesso usato da Oracle, DB2 e MySQL. Lo
trovate nello schema predefinito information_schema.

== Offerte di lavoro su PostgreSQL per aprile 2009 ==

http://archives.postgresql.org/pgsql-jobs/2009-04/threads.php

== Notizie locali su PostgreSQL ==

Il PgDay di Florianopolis (Brasile) sarà il 22 maggio. Mettetevi in
contatto con Dickson S. Guedes (guedes AT guedesoft DOT net) per
partecipare o inviare un lavoro.
http://www.postgresql.org.br/eventos/pgday/sc

La Percona Performance Conference si svolgerà presso il Santa Clara
Convention Center, Santa Clara, California, USA
http://conferences.percona.com/

Aperto il CfP per il PgDay São Paulo, che si terrà il 24 aprile. Per
partecipare mettersi in contatto con marins DOT consultoria AT gmail
DOT com oppure marcelojscosta AT gmail DOT com.

La PostgreSQL Conference U. S. (JDCon) organizzerà un PgDay
nell'ambito della LinuxFest Northwest (25, 26 aprile). Informazioni su
come proporre una comunicazione sono disponibili sul sito
http://www.postgresqlconference.org/

Ci saranno anche dei PgDay il 29 aprile a Porto Velho, RO, e il 30 in
Ji-Parana, RO. Per partecipare mettersi in contatto con Luis Fernando
Bueno: proflfbueno AT gmail DOT com.

Michael Renner farà un workshop sulla replica con PostgreSQL a Netways
OSDC 2009 il 29 e 30 aprile a Norimberga, in Germania.
http://www.netways.de/english/osdc/y2009/programm/w/michael_renner_postgresql_repliziert_ein_ueberblick/

Nei giorni 21 e 22 maggio 2009 all'università di Ottawa, in Canada, si
terrà PGCon 2009. Nei due giorni precedenti si terranno dei tutorials.
http://www.pgcon.org/2009/

Segnatevi la data: pgDay San Jose (USA). Domenica 19 luglio subito
prima di OSCON. Saranno presto annunciate ulteriori informazioni!
(incluso il call for papers)

Il 23 e 24 ottobre 2009 si svolgerà PGCon Brazil, presso Unicamp,
nella città di Campinas, stato di San Paolo.

== Rassegna stampa su PostgreSQL ==

Planet PostgreSQL: http://planet.postgresql.org/

Questo notiziario settimanale PostgreSQL è stato realizzato da David
Fetter e Josh Berkus; traduzione parziale in lingua italiana a cura di
Gianni Ciolli.

Notizie o annunci destinati a questo notiziario dovranno pervenire
entro la mezzanotte di domenica (le 15 nel fuso orario della
California). I comunicati in lingua italiana dovranno essere inviati a
pwn(at)itpug(dot)org; per le lingue inglese o tedesca, si scriva
rispettivamente a david(at)fetter(dot)org o a pwd(at)pgug(dot)de(dot)

== Patch applicate ==

Tom Lane committed:

- In pgsql/doc/src/sgml/release.sgml, make a copy-editing pass over
the 8.4 release notes.

- In pgsql/doc/src/sgml/textsearch.sgml, do some copy-editing on
description of ts_headline().

- In pgsql/src/backend/parser/scan.l, fix broken {xufailed} production
that made HEAD fail on select u&42 from table-with-a-u-column; Also
fix missing SET_YYLLOC() in the {dolqfailed} production that I
suppose this was based on. The latter is a pre-existing bug, but
the only effect is to misplace the error cursor by one token, so
probably not worth backpatching.

- Fix planner to restore its previous level of intelligence about
pushing constants through full joins, as in SELECT * FROM tenk1 a
FULL JOIN tenk1 b USING (unique1) WHERE unique1 = 42; which should
generate a fairly cheap plan where we apply the constraint unique1 =
42 in each relation scan. This had been broken by my patch of
2008-06-27, which is now reverted in favor of a more invasive but
hopefully less incorrect approach. That patch was meant to prevent
incorrect extraction of OR'd indexclauses from OR conditions above
an outer join. To do that correctly we need more information than
the outerjoin_delay flag can provide, so add a nullable_relids field
to RestrictInfo that records exactly which relations are nulled by
outer joins that are underneath a particular qual clause. A side
benefit is that we can make the test in create_or_index_quals more
specific: it is now smart enough to extract an OR'd indexclause into
the outer side of an outer join, even though it must not do so in
the inner side. The old coding couldn't distinguish these cases so
it could not do either.

- In pgsql/src/backend/optimizer/path/costsize.c, bump disable_cost up
from 1e8 to 1e10, per gripe from Kris Jurka.

- Revise plpgsql's scanner to process comments and string literals in
a way more nearly matching the core SQL scanner. The user-visible
effects are: 1. Block comments (slash-star comments) now nest, as
per SQL spec. 2. In standard_conforming_strings mode, backslash as
the last character of a non-E string literal is now correctly taken
as an ordinary character; formerly it was misinterpreted as escaping
the ending quote. (Since the string also had to pass through the
core scanner, this invariably led to syntax errors.) 3. Formerly,
backslashes in the format string of RAISE were always treated as
quoting the next character, regardless of mode. Now, they are
ordinary characters with standard_conforming_strings on, while with
it off, they introduce the same set of escapes as in the core SQL
scanner. Also, escape_string_warning is now effective for RAISE
format strings. These changes make RAISE format strings work just
like any other string literal. This is implemented by copying and
pasting a lot of logic from the core scanner. It would be a good
idea to look into getting rid of plpgsql's scanner entirely in favor
of using the core scanner. However, that involves more change than
I can justify making during beta --- in particular, the core scanner
would have to become re-entrant. In passing, remove the kluge that
made the plpgsql scanner emit T_FUNCTION or T_TRIGGER as a made-up
first token. That presumably had some value once upon a time, but
now it's just useless complication for both the scanner and the
grammar.

- Fix estimate_num_groups() to not fail on PlaceHolderVars, per report
from Stefan Kaltenbrunner. The most reasonable behavior (at least
for the near term) seems to be to ignore the PlaceHolderVar and
examine its argument instead. In support of this, change the API of
pull_var_clause() to allow callers to request recursion into
PlaceHolderVars. Currently estimate_num_groups() is the only
customer for that behavior, but where there's one there may be
others.

- In pgsql/doc/src/sgml/textsearch.sgml, fix textsearch documentation
examples to not recommend concatenating separate fields without
putting a space between. Per gripe from Rick Schumeyer.

- Fix de-escaping checks so that we will reject \000 as well as other
invalidly encoded sequences. Per discussion of a couple of days
ago.

- Rethink the idea of having plpgsql depend on parser/gram.h. Aside
from the fact that this is breaking the MSVC build, it's probably
not really a good idea to expand the dependencies of gram.h any
further than the core parser; for instance the value of SCONST might
depend on which bison version you'd built with. Better to expose an
additional call point in parser.c, so move what I had put into
pl_funcs.c into parser.c. Also PGDLLIMPORT'ify the reference to
standard_conforming_strings, per buildfarm results.

- Assorted portability fixes for Borland C, from Pavel Golub.

Alvaro Herrera committed:

- In pgsql/src/bin/pg_dump/pg_restore.c, make new strings more alike
previously existing messages.

- In pgsql/src/bin/pg_dump/pg_restore.c, pg_restore -jN does not
equate "multiple jobs", so partly revert the previous patch. Per
note from Tom Lane.

- In pgsql/src/backend/commands/dbcommands.c, add missing periods.

- In pgsql/src/backend/libpq/hba.c, add missing gettext calls around
some strings. Also remove quotes around the %s that they expand to,
per comment from Tom Lane.

- In pgsql/src/backend/utils/adt/arrayfuncs.c, substitute extraneous
underscores with spaces.

- In pgsql/src/test/regress/expected/arrays.out, fix the regression
test error message for array_fill, too. Per note from Andrew
Dunstan.

Bruce Momjian committed:

- In pgsql/src/interfaces/libpq/fe-secure.c, add libpq error message
text on how to handle missing root.crt file.

- In pgsql/doc/src/sgml/libpq.sgml, reformat 'sslmode' options into an
SGML table; improve wording.

- In pgsql/doc/src/sgml/libpq.sgml, fix SGML markup I broke yesterday.

- Remove mention of pre-7.1 inheritance behavior from /ref pages; keep
mentions in main documentation.

- In pgsql/doc/src/sgml/release.sgml, add Ron Mayer as primary
contributor for, "support the IS0 8601 interval syntax" based on
private email from Ron.

Magnus Hagander committed:

- In pgsql/contrib/pgcrypto/crypt-md5.c, remove beer-ware license from
crypt-md5.c, per approval from Poul-Henning Kamp. This makes the
file the same standard 2-clause BSD as the rest of PostgreSQL.

== Patch rifiutate (per adesso) ==

KaiGai Kohei's patch to separate the ACL for SELECT ... FOR UPDATE
from UPDATE. Not needed.

== Patch in coda ==

Abhijit Menon-Sen sent in another revision of his patch to test
quoting in PL/pgSQL.

ITAGAKI Takahiro sent in a patch to implement GetPlatformEncoding()
and convert absolute file paths from database encoding to platform
encoding.

David Fetter sent in three patches to make \df describe whether a
function is normal, aggregate, trigger or windowing and let people
choose any or all of those to see.

ITAGAKI Takahiro sent in a WIP patch to solve server-side encoding
issues.

Fujii Masao sent in another revision of his trigger patch for
pg_standby.

Marko Kreen sent in a patch to add \u and \U as unicode escapes.

KaiGai Kohei sent in another revision of his SE-PostgreSQL patches.