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Wöchentlicher PostgreSQL Newsletter - 02. Dezember 2007


Der Originalartikel befindet sich unter:
http://people.planetpostgresql.org/dfetter/


== Wöchentlicher PostgreSQL Newsletter - 02. Dezember 2007 ==

8.3 Beta 4 erscheint bald. Bitte mit dem Testen fortfahren :)

Josh Berkus wird auf der FOSS.IN sprechen. Hilf mit, den BoF zu vergrößern!
http://www.foss.in/

David Fetter wird auf der PgCon.BR in Sao Paulo vom 7.-8. Dezember sprechen.
http://pgcon.postgresql.org.br/index.en.html

Neue Umfrage: Wann wirst du deinen PostgreSQL Server updaten?
http://www.postgresql.org/community

== PostgreSQL Produkt Neuigkeiten ==

Netvault v3.0 erschienen.
www.bakbone.com/postgresql

Benetl 1.0 für Windows erschienen.
http://www.benetl.net

== PostgreSQL Lokal ==

PGCon 2008 Call for Papers startet am 19. Dezember. Jetzt mit den Papers beginnen.
http://www.pgcon.org/2008/papers.php

PostgreSQL Conference East '08 ist am 28. und 29. März.
http://www.postgresqlconference.org/

== PostgreSQL in den News ==

Planet PostgreSQL: http://www.planetpostgresql.org/

General Bits, Archive und gelegentliche News Artikel:
http://www.varlena.com/GeneralBits/

Dieser wöchentliche PostgreSQL Newsletter wurde erstellt von David Fetter

Sende Neuigkeiten und Ankündigungen bis Sonntag, 15 Uhr Pazifischer
Zeit. Bitte sende englische Beiträge an david@fetter.org, deutsche an
pwn@pgug.de, italienische an pwn@itpug.org.

== Angewandte Patches ==

Andrew Dunstan committed:

- Workaround for perl problem where evaluating UTF8 regexes can cause
implicit loading of modules, thereby breaking Safe rules. We
compile and call a tiny perl function on trusted interpreter init,
after which the problem does not occur.

- Revert inadvertantly committed change.

Magnus Hagander committed:

- Back-patch mingw configure-check for gettimeofday so that 8.2 can be
built with current versions of mingw.

- Use _dosmaperr() to deal with errors opening files in
pgwin32_open(). Per complaint from Alvaro and subsequent
discussion.

- Add win32error.c to libpq, needed to resolve _dosmaperr.

Bruce Momjian committed:

- Reorganize MONEY TODO into a separate section, add casting item.

- Add documentation about the issues of casting MONEY to/from numeric
types.

- Wording improvement for MONEY casting.

- In pgsql/doc/src/sgml/datatype.sgml, add example of MONEY casting to
numeric if locale is known.

- In pgsql/src/backend/tsearch/dict_thesaurus.c, change a stop word on
the right-hand-side in the thesaurus file to be an ERROR, not
NOTICE.

- In pgsql/doc/src/sgml/func.sgml, add a few current_* variable index
entries to the docs. Guillaume Lelarge.

- Add comments about VACUUM to free space map docs. Joshua D. Drake.

- Plpgsql doc cleanup. Guillaume Lelarge.

- Update RETURN NEXT documentation for plpgsql.

- RETURN NEXT doc improvement, per Alvaro Herrera.

- Add additional PITR documentation. Simon Riggs.

- Update Japanese FAQ. Jun Kuwamura.

- Update release notes to current CVS.

Tom Lane committed:

- Fix select_common_type() so that it can select a domain type, if all
inputs to a UNION, CASE, or related construct are of the same domain
type. The main part of this routine smashes domains to their base
types, which seems necessary because the logic involves
TypeCategory() and IsPreferredType(), neither of which work usefully
on domains. However, we can add a first pass that just detects
whether all the inputs are exactly the same type, and if so accept
that without question (so long as it's not UNKNOWN). Per recent
gripe from Dean Rasheed. In passing, remove some tests for
InvalidOid, which have clearly been dead code for quite some time
now, because getBaseType() would fail on that input. Also, clarify
the manual's not-very-precise description of the existing
algorithm's behavior.

- In pgsql/src/backend/utils/adt/xml.c, suppress compiler warning.

- Add quote_literal(anyelement) to preserve (and, in fact, extend) a
useful consequence of the former liberal implicit casting to text;
namely that you can feed non-string values to quote_literal() and
get unsurprising results. Per discussion.

- Fix pg_regress to check the directory it is actually reading files
from, not the image that (theoretically) should exist in the current
directory. Jorgen Austvik

- Fix plpgsql not to look up block labels except in contexts where a
block label is sane (eg, EXIT argument or first part of a qualified
identifier), and cause more-closely-nested record variables to take
precedence over outer block labels. This cures the breakage
exhibited by Marko Kreen that 8.3 no longer allowed a function's
name to be used for a variable within the function, and makes
plpgsql's handling of block labels more like Oracle's. It's
important to fix this now because we are documenting the use of
block labels as variable qualifiers for the first time in 8.3.

- Install a lookaside cache to speed up repeated lookups of the same
operator by short-circuiting schema search path and
ambiguous-operator resolution computations. Remarkably, this buys
as much as 45% speedup of repetitive simple queries that involve
operators that are not an exact match to the input datatypes. It
should be marginally faster even for exact-match cases, though I've
not had success in proving an improvement in benchmark tests. Per
report from Guillame Smet and subsequent discussion.

- Adjust the names of a couple of tsearch index support functions that
had inappropriately generic-sounding names. This is more or less
free since we already forced initdb for the next beta, and it may
prevent confusion or name conflicts (particularly at the
C-global-symbol level) down the road. Per my proposal yesterday.

- Improve test coverage of CLOBBER_CACHE_ALWAYS by having it also
force reloading of operator class information on each use of
LookupOpclassInfo. Had this been in place a year ago, it would have
helped me find a bug in the then-new 'operator family' code. Now
that we have a build farm member testing CLOBBER_CACHE_ALWAYS on a
regular basis, it seems worth expending a little bit of effort here.

- Make a cleanup pass over error reports in tsearch code. Use ereport
for user-facing errors, fix some poor choices of errcode, adhere to
message style guide.

- Repair bug that allowed RevalidateCachedPlan to attempt to rebuild a
cached plan before the effects of DDL executed in an immediately
prior SPI operation had been absorbed. Per report from Chris Wood.
This patch has an unpleasant side effect of causing the number of
CommandCounterIncrement()s done by a typical plpgsql function to
approximately double. Amelioration of the consequences of that will
be undertaken in a separate patch.

- Avoid incrementing the CommandCounter when CommandCounterIncrement
is called but no database changes have been made since the last
CommandCounterIncrement. This should result in a significant
improvement in the number of "commands" that can typically be
performed within a transaction before hitting the 2^32 CommandId
size limit. In particular this buys back (and more) the possible
adverse consequences of my previous patch to fix plan caching
behavior. The implementation requires tracking whether the current
CommandCounter value has been "used" to mark any tuples.
CommandCounter values stored into snapshots are presumed not to be
used for this purpose. This requires some small executor changes,
since the executor used to conflate the curcid of the snapshot it
was using with the command ID to mark output tuples with.
Separating these concepts allows some small simplifications in
executor APIs. Something for the TODO list: look into having
CommandCounterIncrement not do AcceptInvalidationMessages. It seems
fairly bogus to be doing it there, but exactly where to do it
instead isn't clear, and I'm disinclined to mess with asynchronous
behavior during late beta.

- Suppress compiler warnings in recent plperl patch. Avoid uselessly
expensive lookup of the well-known OID of textout().

- Code review for LIKE ... INCLUDING INDEXES patch. Fix failure to
propagate constraint status of copied indexes (bug #3774), as well
as various other small bugs such as failure to pstrdup when needed.
Allow INCLUDING INDEXES indexes to be merged with identical declared
indexes (perhaps not real useful, but the code is there and having
it not apply to LIKE indexes seems pretty unorthogonal). Avoid
useless work in generateClonedIndexStmt(). Undo some poorly chosen
API changes, and put a couple of routines in modules that seem to be
better places for them.

- Sync release notes with CVS HEAD; various editorial improvements.

- Mention hash opclasses in 'System Dependencies on Operator Classes',
which previously only talked about btree opclasses.

- Improve the manual's discussion of partitioning. Recommend using a
trigger instead of a rule to redirect insertions, use NEW.* notation
where appropriate, some other updates and adjustments. David Fetter
and Tom Lane

- Add SGML docs for contrib/dict_int and contrib/dict_xsyn. Albert
Cervera i Areny

- Remove README files now migrated to SGML docs.

- Ensure that all <sect1> and <refentry> tags have IDs. This is
needed to ensure that the resulting webpages have predictable URLs,
instead of ever-changing numeric IDs. The new contrib docs were the
biggest offender, but some old stuff had the problem too. Also,
rename a couple of new contrib sgml files for consistency's sake.

- Revert COPY OUT to follow the pre-8.3 handling of ASCII control
characters, namely that \r, \n, \t, \b, \f, \v are dumped as those
two-character representations rather than a backslash and the
literal control character. I had made it do the other to save some
code, but this was ill-advised, because dump files in which these
characters appear literally are prone to newline mangling.
Fortunately, doing it the old way should only cost a few more lines
of code, and not slow down the copy loop materially. Per bug #3795
from Lou Duchez.

- Stamp 8.3beta4.

Peter Eisentraut committed:

- Require a specific Autoconf version, instead of a lower bound only.

- In pgsql/doc/src/sgml/ref/create_index.sgml, change index_name to
name for consistency.

- In pgsql/src/backend/libpq/auth.c, correct capitalization.

- Make casts from xml to text independent of the XML option setting,
thus immutable and indexable. Also fix the volatility settings of
some other XML-related functions.

- In psql, properly recognize and announce input errors.

- In pgsql/doc/src/sgml/high-availability.sgml, fix column number.

- In pgsql/doc/src/sgml/release.sgml, add credit to Pavel Stehule for
XML functionality.

- Fix typo in pgsql/src/backend/libpq/auth.c.

- Improve terminology in pgsql/src/backend/tsearch/ts_locale.c.

- In pgsql/src/backend/utils/adt: xml.c, fix XML Schema structure for
char types without length (bug #3782).

- Spell checker run

- Properly capitalize Ispell in pgsql/src/backend/tsearch/dict_ispell.c.

- Translation updates.

== Abgelehnte Patches (bis jetzt) ==

Mathias Hasselmann sent in a patch to add Avahi support to Postgres,
widening the choice of platforms where Postgres can advertise itself
via DSN-SD (ZeroConf). Saved for 8.4.

Gevik Babakhani sent in two revisions of a patch which implements
named parameters for function calls. Saved for 8.4.

Pavel Stehule's patch to add LOOP support for CURSORs in PL/PgSQL.
Saved for 8.4.

== Eingesandte Patches ==

Tom Lane sent in a patch intended to cache operator lookups.

Jorgen Austvik sent in a patch to fix the large object regression
tests.

Brendan Jurd sent in a patch which allows the construction of an
empty array if an explicit cast to an array type is given (as in,
ARRAY[]::int[]).

Euler Taveira de Oliveira sent in an update for the Brazilian FAQ.
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