of the syntax as this fundamentally dead-end approach can, in particular
combinations of single and multi column assignments. Improve rather
inadequate documentation and provide some regression tests.
> * Simplify ability to create partitioned tables
>
> This would allow creation of partitioned tables without requiring
> creation of rules for INSERT/UPDATE/DELETE, and constraints for
> rapid partition selection. Options could include range and hash
> partition selection.
>
> * Allow auto-selection of partitioned tables for min/max() operations
< Last updated: Sat Sep 2 08:31:04 EDT 2006
> Last updated: Sat Sep 2 16:31:46 EDT 2006
< o Allow UPDATE tab SET ROW (col, ...) = (...) for updating multiple
< columns
> o -Allow UPDATE tab SET ROW (col, ...) = (val, ...) for updating
> multiple columns
> o Allow UPDATE tab SET ROW (col, ...) = (SELECT...)
< A subselect can also be used as the value source.
RETURNING play nice with views/rules. To wit, have the rule rewriter
rewrite any RETURNING clause found in a rule to produce what the rule's
triggering query asked for in its RETURNING clause, in particular drop
the RETURNING clause if no RETURNING in the triggering query. This
leaves the responsibility for knowing how to produce the view's output
columns on the rule author, without requiring any fundamental changes
in rule semantics such as adding new rule event types would do. The
initial implementation constrains things to ensure that there is
exactly one, unconditionally invoked RETURNING clause among the rules
for an event --- later we might be able to relax that, but for a post
feature freeze fix it seems better to minimize how much invention we do.
Per gripe from Jaime Casanova.
"server_version" but uses the handy PG_VERSION_NUM which allows apps to
do things like if ($version >= 80200) without having to parse apart the
value of server_version themselves.
Greg Sabino Mullane greg@turnstep.com
< Last updated: Tue Aug 29 12:21:52 EDT 2006
> Last updated: Wed Aug 30 20:34:28 EDT 2006
< o Allow COPY (SELECT ...) TO 'filename'
<
< COPY should also be able to output views using COPY (SELECT
< * FROM view) TO 'filename' internally.
< http://archives.postgresql.org/pgsql-patches/2005-09/msg00148.php
> o -Allow COPY (SELECT ...) TO 'filename'
queries via a cursor, fetching a limited number of rows at a time and
therefore not risking exhausting memory. A disadvantage of the scheme
is that 'aligned' output mode will align each group of rows independently
leading to odd-looking output, but all the other output formats work
reasonably well. Chris Mair, with some additional hacking by moi.
optionally bind. I re-added the "statement:" label so people will
understand why the line is being printed (it is log_*statement
behavior).
Use single quotes for bind values, instead of double quotes, and double
literal single quotes in bind values (and document that). I also made
use of the DETAIL line to have much cleaner output.
> o Allow DEFERRABLE and end-of-statement UNIQUE constraints?
>
> This would allow UPDATE tab SET col = col + 1 to work if col has
> a unique index. Currently, uniqueness checks are done while the
> command is being executed, rather than at the end of the statement
> or transaction.
>
<
< * Allow DEFERRABLE and end-of-statement UNIQUE constraints?
<
< This would allow UPDATE tab SET col = col + 1 to work if col has
< a unique index. Currently, uniqueness checks are done while the
< command is being executed, rather than at the end of the statement
< or transaction.
< * Allow DEFERRABLE UNIQUE constraints?
> * Allow DEFERRABLE and end-of-statement UNIQUE constraints?
>
> This would allow UPDATE tab SET col = col + 1 to work if col has
> a unique index. Currently, uniqueness checks are done while the
> command is being executed, rather than at the end of the statement
> or transaction.
>
Fix all the standard PLs to be able to return tuples from FOO_RETURNING
statements as well as utility statements that return tuples. Also,
fix oversight that SPI_processed wasn't set for a utility statement
returning tuples. Per recent discussion.
< * All backends running as threads in a single process (not want)
> * All backends running as threads in a single process (not wanted)
< * Optimizer hints (not want)
> * Optimizer hints (not wanted)
>
> * Allow AS in "SELECT col AS label" to be optional (not wanted)
>
> Because we support postfix operators, it isn't possible to make AS
> optional and continue to use bison.
> http://archives.postgresql.org/pgsql-sql/2006-08/msg00164.php
< o Allow COPY to output from SELECT
> o Allow COPY (SELECT ...) TO 'filename'
< COPY should also be able to output views.
> COPY should also be able to output views using COPY (SELECT
> * FROM view) TO 'filename' internally.
of the transaction ID counter. Nothing is done with the epoch except to
store it in checkpoint records, but this provides a foundation with which
add-on code can pretend that XIDs never wrap around. This is a severely
trimmed and rewritten version of the xxid patch submitted by Marko Kreen.
Per discussion, the epoch counter seems the only part of xxid that really
needs to be in the core server.
< * %Disallow changing DEFAULT expression of a SERIAL column?
<
< This should be done only if the existing SERIAL problems cannot be
< fixed.
<
< * %Disallow ALTER SEQUENCE changes for SERIAL sequences because pg_dump
< does not dump the changes
by abandoning the idea that it should say SERIAL in the dump. Instead,
dump serial sequences and column defaults just like regular ones.
Add a new backend command ALTER SEQUENCE OWNED BY to let pg_dump recreate
the sequence-to-column dependency that was formerly created "behind the
scenes" by SERIAL. This restores SERIAL to being truly "just a macro"
consisting of component operations that can be stated explicitly in SQL.
Furthermore, the new command allows sequence ownership to be reassigned,
so that old mistakes can be cleaned up.
Also, downgrade the OWNED-BY dependency from INTERNAL to AUTO, since there
is no longer any very compelling argument why the sequence couldn't be
dropped while keeping the column. (This forces initdb, to be sure the
right kinds of dependencies are in there.)
Along the way, add checks to prevent ALTER OWNER or SET SCHEMA on an
owned sequence; you can now only do this indirectly by changing the
owning table's owner or schema. This is an oversight in previous
releases, but probably not worth back-patching.
that ps_status provides by appending 'waiting' to the PS display. This
completes the project of making it feasible to turn off process title
updates and instead rely on pg_stat_activity. Per my suggestion a few
weeks ago.
than N seconds apart. This allows a simple, if not very high performance,
means of guaranteeing that a PITR archive is no more than N seconds behind
real time. Also make pg_current_xlog_location return the WAL Write pointer,
add pg_current_xlog_insert_location to return the Insert pointer, and fix
pg_xlogfile_name_offset to return its results as a two-element record instead
of a smashed-together string, as per recent discussion.
Simon Riggs
found. Besides stopping those early who have no dtrace installed
whatsoever, this will also alert those who have dtrace in /usr/sbin, which
might not be in the path, which would produce confusing failures much later
in the build process.
Add documentation about pointing configure to find dtrace.
such as debugging and performance measurement. This consists of two features:
a table of "rendezvous variables" that allows separately-loaded shared
libraries to communicate, and a new GUC setting "local_preload_libraries"
that allows libraries to be loaded into specific sessions without explicit
cooperation from the client application. To make local_preload_libraries
as flexible as possible, we do not restrict its use to superusers; instead,
it is restricted to load only libraries stored in $libdir/plugins/. The
existing LOAD command has also been modified to allow non-superusers to
LOAD libraries stored in this directory.
This patch also renames the existing GUC variable preload_libraries to
shared_preload_libraries (after a suggestion by Simon Riggs) and does some
code refactoring in dfmgr.c to improve clarity.
Korry Douglas, with a little help from Tom Lane.
merely a matter of fixing the error check, since the underlying Portal
infrastructure already handles it. This in turn allows these statements
to be used in some existing plpgsql and plperl contexts, such as a
plpgsql FOR loop. Also, do some marginal code cleanup in places that
were being sloppy about distinguishing SELECT from SELECT INTO.
< o Allow INSERT/UPDATE ... RETURNING new.col or old.col
<
< This is useful for returning the auto-generated key for an INSERT.
< One complication is how to handle rules that run as part of
< the insert.
< http://archives.postgresql.org/pgsql-patches/2005-07/msg00568.php
> o -Allow INSERT/UPDATE ... RETURNING new.col or old.col
plpgsql support to come later. Along the way, convert execMain's
SELECT INTO support into a DestReceiver, in order to eliminate some ugly
special cases.
Jonah Harris and Tom Lane
>
>
> Features We Do _Not_ Want
> =========================
>
> * All backends running as threads in a single process (not want)
>
> This eliminates the process protection we get from the current setup.
> Thread creation is usually the same overhead as process creation on
> modern systems, so it seems unwise to use a pure threaded model.
>
> * Optimizer hints (not want)
>
> Optimizer hints are used to work around problems in the optimizer. We
> would rather have the problems reported and fixed.
> http://archives.postgresql.org/pgsql-hackers/2006-08/msg00506.php
< A package would be a schema with its own variables,
< private functions, and initialization functions. It
> A package would be a schema with public/private variables,
> public/private functions, and initialization functions. It
< private functions, and initialization functions
> private functions, and initialization functions. It
> is also possible to implement these capabilities
> in all schemas and not use a separate "packages"
> syntax at all.
loaded libraries: call functions _PG_init() and _PG_fini() if the library
defines such symbols. Hence we no longer need to specify an initialization
function in preload_libraries: we can assume that the library used the
_PG_init() convention, instead. This removes one source of pilot error
in use of preloaded libraries. Original patch by Ralf Engelschall,
preload_libraries changes by me.
< o Automatically force archiving of partially-filled WAL files when
> o -Automatically force archiving of partially-filled WAL files when
<
< Doing this will allow administrators to know more easily when
< the archive contains all the files needed for point-in-time
< recovery.
< http://archives.postgresql.org/pgsql-patches/2005-04/msg00121.php
<
< o Add reporting of the current WAL file and offset, perhaps as
> o -Add reporting of the current WAL file and offset, perhaps as
<
< The offset allows parts of a WAL file to be archived using
< an external program.
<
o print user name for all
o print portal name if defined for all
o print query for all
o reduce log_statement header to single keyword
o print bind parameters as DETAIL if text mode
to happen automatically during pg_stop_backup(). Add some functions for
interrogating the current xlog insertion point and for easily extracting
WAL filenames from the hex WAL locations displayed by pg_stop_backup
and friends. Simon Riggs with some editorialization by Tom Lane.
the DROP pass rather than the ADD_CONSTR pass. On examining the code I
think this was just an oversight rather than intentional, and it seems
to satisfy the principle of least surprise better than the alternative
solution that was discussed. Add an example to the ref page showing how
to do ALTER TYPE and update the default in one command. Per gripe from
Markus Bertheau that that wasn't possible.
(table or index) before trying to open its relcache entry. This fixes
race conditions in which someone else commits a change to the relation's
catalog entries while we are in process of doing relcache load. Problems
of that ilk have been reported sporadically for years, but it was not
really practical to fix until recently --- for instance, the recent
addition of WAL-log support for in-place updates helped.
Along the way, remove pg_am.amconcurrent: all AMs are now expected to support
concurrent update.
created in the bootstrap phase proper, rather than added after-the-fact
by initdb. This is cleaner than before because it allows us to retire the
undocumented ALTER TABLE ... CREATE TOAST TABLE command, but the real reason
I'm doing it is so that toast tables of shared catalogs will now have
predetermined OIDs. This will allow a reasonably clean solution to the
problem of locking tables before we load their relcache entries, to appear
in a forthcoming patch.
