PostgreSQL Weekly News – December 05 2010

== PostgreSQL Weekly News – December 05 2010 ==

== PostgreSQL Product News ==

Internet24, a German based web hosting company, offers PostgreSQL 9.0
for all products.

MicroOLAP Database Designer 1.3.0 for PostgreSQL released.

phpPgAdmin 5.0, a web-based administrative tool for PostgreSQL, released.

== PostgreSQL Local ==

The PostgreSQLFr Call for Projects has begun. Projects must target
PostgreSQL and the French-speaking community. Mail appel-projets-2010
AT postgresql DOT fr.

FOSDEM is one of the biggest Free and Open Source event held annually
in Brussels, Belgium, on February 5-6, 2011, and attended by around
4000 people. Send in your proposal to fosdem AT postgresql DOT eu.

A PGDay.US is scheduled at this year’s Southern California Linux
Exposition (SCALE) held in the LAX Hilton Hotel in the city of Los
Angeles, California, on Friday February 25th, 2011. Post your talk
submission to pgday-submissions AT googlegroups DOT com.

PGCon will be May 19-20, 2011 at the University of Ottawa, preceded by
two days of tutorials on May 17-18.

== PostgreSQL in the News ==

Planet PostgreSQL:

PostgreSQL Weekly News is brought to you this week by David Fetter

Submit news and announcements by Sunday at 3:00pm Pacific time.
Please send English language ones to, German language
to, Italian language to Spanish language

== Reviews ==

== Applied Patches ==

Heikki Linnakangas pushed:

– Be consistent about writing “[, …]” instead “[,…]” in the docs.
Christoph Berg.;a=commitdiff;h=3c42efceb21b8dfe1b5686bd914520980933fcd4

– Refactor the pg_dump zlib code from pg_backup_custom.c to a separate
file, to make it easier to reuse that code. There is no
user-visible changes. This is in preparation for the patch to add a
new archive format, a directory, to perform a custom-like dump but
with each table being dumped to a separate file (that in turn is a
prerequisite for parallel pg_dump). This also makes it easier to
add new compression methods in the future, and makes the
pg_backup_custom.c code easier to read, when the compression-related
code is factored out. Joachim Wieland, with heavy editorialization
by me.;a=commitdiff;h=bf9aa490db24b2334b3595ee33653bf2fe39208c

– Remove misleading comments. Move _Clone and _DeClone functions
before the “END OF FORMAT CALLBACKS” comment, because they are
format callbacks too.;a=commitdiff;h=9cea52a5a354853a76b90c20d7d3bf87df45ebbf

Tom Lane pushed:

– Simplify and speed up mapping of index opfamilies to pathkeys.
Formerly we looked up the operators associated with each index
(caching them in relcache) and then the planner looked up the btree
opfamily containing such operators in order to build the
btree-centric pathkey representation that describes the index’s sort
order. This is quite pointless for btree indexes: we might as well
just use the index’s opfamily information directly. That saves
syscache lookup cycles during planning, and furthermore allows us to
eliminate the relcache’s caching of operators altogether, which may
help in reducing backend startup time. I added code to plancat.c to
perform the same type of double lookup on-the-fly if it’s ever faced
with a non-btree amcanorder index AM. If such a thing actually
becomes interesting for production, we should replace that logic
with some more-direct method for identifying the corresponding btree
opfamily; but it’s not worth spending effort on now. There is
considerably more to do pursuant to my recent proposal to get rid of
sort-operator-based representations of sort orderings, but this
patch grabs some of the low-hanging fruit. I’ll look at the
remainder of that work after the current commitfest.;a=commitdiff;h=c0b5fac7010fa3468577d3a90ee8783639500fed

– Prevent inlining a SQL function with multiple OUT parameters. There
were corner cases in which the planner would attempt to inline such
a function, which would result in a failure at runtime due to loss
of information about exactly what the result record type is. Fix by
disabling inlining when the function’s recorded result type is
RECORD. There might be some sub-cases where inlining could still be
allowed, but this is a simple and backpatchable fix, so leave
refinements for another day. Per bug #5777 from Nate Carson.
Back-patch to all supported branches. 8.1 happens to avoid a
core-dump here, but it still does the wrong thing.;a=commitdiff;h=225f0aa3dfef55554cbe2e6da73df5e41b9eec18

– Create core infrastructure for KNNGIST. This is a heavily revised
version of builtin_knngist_core-0.9. The ordering operators are no
longer mixed in with actual quals, which would have confused not
only humans but significant parts of the planner. Instead, ordering
operators are carried separately throughout planning and execution.
Since the API for ambeginscan and amrescan functions had to be
changed anyway, this commit takes the opportunity to rationalize
that a bit. RelationGetIndexScan no longer forces a premature
index_rescan call; instead, callers of index_beginscan must call
index_rescan too. Aside from making the AM-side initialization
logic a bit less peculiar, this has the advantage that we do not
make a useless extra am_rescan call when there are runtime key
values. AMs formerly could not assume that the key values passed to
amrescan were actually valid; now they can. Teodor Sigaev and Tom

– Put back gistgettuple’s check for backwards scan request. On
reflection it’s a bad idea for the KNNGIST patch to have removed
that. We don’t want it silently returning incorrect answers.;a=commitdiff;h=04910a3ad5cd2901558da2a4fad9a2e2819348aa

– Add external documentation for KNNGIST.;a=commitdiff;h=b576757d7ee064ada5351c2e6a36c2f7234aa1d4

– Add KNNGIST support to contrib/pg_trgm. Teodor Sigaev, with some
revision by Tom Lane.;a=commitdiff;h=b525bf771e31a2254f28bf25c6ed7987d64c8afb

– Update comment to match later code changes.;a=commitdiff;h=e194a942f98caf0b278e3ba30a85545ac790ea1d

– Fix two small bugs in new gistget.c logic. 1. Complain, rather than
silently doing nothing, if an “invalid” tuple is found on a leaf
page. Per off-list discussion with Heikki Linnakangas. 2. Fix
oversight in code that removes a GISTSearchItem from the search
queue: we have to reset lastHeap if this was the last heap item in
the parent GISTSearchTreeItem. Otherwise subsequent additions will
do the wrong thing. This was probably masked in early testing
because in typical cases the parent item would now be completely
empty and would be deleted on next call. You’d need a queued
non-leaf page at exactly the same distance as a heap tuple to expose
the bug.;a=commitdiff;h=d1f5a92e18dcfc750e9d338597e66af920aad99e

– Reduce memory consumption inside inheritance_planner(). Avoid
eating quite so much memory for large inheritance trees, by
reclaiming the space used by temporary copies of the original
parsetree and range table, as well as the workspace needed during
planning. The cost is needing to copy the finished plan trees out
of the child memory context. Although this looks like it ought to
slow things down, my testing shows it actually is faster, apparently
because fewer interactions with malloc() are needed and/or we can do
the work within a more readily cacheable amount of memory. That
result might be platform-dependent, but I’ll take it. Per a gripe
from John Papandriopoulos, in which it was pointed out that the
memory consumption actually grew as O(N2) for sufficiently many
child tables, since we were creating N copies of the N-element range

Alvaro Herrera pushed:

– Remove trailing whitespace.;a=commitdiff;h=0025b76f4fc52bed4e8ad2623ec6b9821a4e936c

– Silence compiler.;a=commitdiff;h=7f4a7af2fd0991dc3ef14a63c614a7ad17b56c79

– Move private struct declaration to compress_io.c. Keep only the
typedef in the header file.;a=commitdiff;h=d7e5d151daa2d5fe096953ae0b3530707b7c87f5

– Remove useless struct declaration.;a=commitdiff;h=d67a39c3267d1901ae9e702637cc56b16e70332a

ITAGAKI Takahiro pushed:

– Remove unnecessary string null-termination in pg_convert. We can
directly verify the unterminated input with pg_verify_mbstr_len.;a=commitdiff;h=fd223c7407c7067ac3ec7e586f9e3d7b5afd2b2e

Robert Haas pushed:

– Use GUC lexer for recovery.conf parsing. This eliminates some
crufty, special-purpose code and, as a non-trivial side benefit,
allows recovery.conf parameters to be unquoted. Dimitri Fontaine,
with review and cleanup by Alvaro Herrera, Itagaki Takahiro, and me.;a=commitdiff;h=970a18687f9b3058e89d5994a8fbf70888e79548

– Remove now-outdated mention of quotes being required in
recovery.conf. Noted by Itagaki Takahiro.;a=commitdiff;h=5ef6c913836b136632adf8f4625691e4656e8c05

– Clarify that LOCK TABLE requires a table-level privilege.;a=commitdiff;h=c0a4d3e0511b4d1f7996451329deaa2acd0e18fa

Peter Eisentraut pushed:

– Make output width consistent for all ways of invoking a regression
test. run_schedule() and run_single_test() were using different
output widths, which would show up in bigcheck/bigtest, for example.;a=commitdiff;h=387e468b82952776121a8d4bd409d72757edbc16

== Rejected Patches (for now) ==

No one was disappointed this week 🙂

== Pending Patches ==

Dimitri Fontaine and ITAGAKI Takahiro traded revisions of the patch to
add pg_execute_from_file().

David Fetter and ITAGAKI Takahiro traded patches to add tab completion
to psql for triggers on views.

Based on a review by Andy Colson, Robert Haas sent in another revision
of the patch to add unlogged tables.

Greg Smith sent in another revision of the patch to spread out
checkpoint syncs.

Dimitri Fontaine sent in another revision of the patch to add

Radoslaw Smogura sent in another revision of the JDBC driver.

Heikki Linnakangas sent in two more revisions of the patch to fix the
“too many KnownAssignedXids” issue on hot standby.

Joachim Wieland sent in another flock of patches for parallel pg_dump.

Heikki Linnakangas sent in another revision of the patch to rewrite
how GiST inserts happen.

Peter Eisentraut sent in another revision of the patch to add
per-column collation.

Boxuan Zhai sent in another revision of the patch to add MERGE.

Andrew Dunstan sent in a patch to allow COPY routines to read
arbitrary numbers of fields.

Greg Smith sent in another revision of the patch to instrument
checkpoint sync calls.

Andrew Dunstan sent in a patch to allow COPY routines to read
arbitrary numbers of fields.

Greg Smith sent in another revision of the patch to instrument
checkpoint sync calls.

Comments are closed.