Tom Lane [Fri, 10 Jun 2005 03:32:25 +0000 (03:32 +0000)]
Quick hack to allow the outer query's tuple_fraction to be passed down
to a subquery if the outer query is simple enough that the LIMIT can
be reflected directly to the subquery. This didn't use to be very
interesting, because a subquery that couldn't have been flattened into
the upper query was usually not going to be very responsive to
tuple_fraction anyway. But with new code that allows UNION ALL subqueries
to pay attention to tuple_fraction, this is useful to do. In particular
this lets the optimization occur when the UNION ALL is directly inside
a view.
Tom Lane [Fri, 10 Jun 2005 02:21:05 +0000 (02:21 +0000)]
If a LIMIT is applied to a UNION ALL query, plan each UNION arm as
if the limit were directly applied to it. This does not actually
add a LIMIT plan node to the generated subqueries --- that would be
useless overhead --- but it does cause the planner to prefer fast-
start plans when the limit is small. After an idea from Phil Endecott.
Tom Lane [Fri, 10 Jun 2005 00:28:54 +0000 (00:28 +0000)]
Revise searching of subplan target lists to use something more efficient
than tlist_member calls. Building a large join tlist is still O(N^2),
but with a much smaller constant factor than before.
Bruce Momjian [Thu, 9 Jun 2005 22:29:52 +0000 (22:29 +0000)]
This patch against 8.0.0beta1 source adds log_line_prefix options for
millisecond timestamps (%m) and remote host (%h). The milliseconds are
useful for QPS measurements.
Tom Lane [Thu, 9 Jun 2005 21:52:07 +0000 (21:52 +0000)]
Fix assign_datestyle() so that it doesn't misleadingly complain about
'conflicting datestyle specifications' for input that's actually only
redundant, such as SET DATESTYLE = MDY, MDY. Per recent gripe.
Tom Lane [Thu, 9 Jun 2005 21:25:22 +0000 (21:25 +0000)]
Make SPI set SPI_processed for CREATE TABLE AS / SELECT INTO commands;
this in turn causes CREATE TABLE AS in plpgsql to set ROW_COUNT.
This is how it behaved before 7.4; I had unintentionally changed the
behavior in a bit of sloppy micro-optimization.
Bruce Momjian [Thu, 9 Jun 2005 17:56:51 +0000 (17:56 +0000)]
Since I needed this feature badly, I added the -n / --schema switch to
pg_restore. It restores the given schemaname only. It can be used in
conjunction with the -t and other switches to make the selection very
fine grained.
Bruce Momjian [Thu, 9 Jun 2005 16:35:09 +0000 (16:35 +0000)]
Please find attached a patch (diff -c against cvs HEAD) to add a
function that accepts a double precision argument assumed to be a Unix
epoch timestamp and returns timestamp with time zone, and accompanying
documentation.
Bruce Momjian [Thu, 9 Jun 2005 15:27:27 +0000 (15:27 +0000)]
I've created a patch which adds support for troff "-ms" output to
psql. i.e. "\pset format troff-ms". The patch also corrects some
problems with the "latex" format, notably defining an extra column in
the output table, and correcting some alignment issues; it also
changes the output to match the border setting as documented in the
manual page and as shown with the "aligned" format.
The troff-ms output is mostly identical to the latex output allowing
for the differences between the two typesetters.
The output should be saved in a file and piped as follows:
Because it contains tabs, you'll need to redirect psql output or use
"script", rather than pasting from a terminal window, due to the tabs
which can be replaced with spaces.
Tom Lane [Thu, 9 Jun 2005 04:19:00 +0000 (04:19 +0000)]
Simplify the planner's join clause management by storing join clauses
of a relation in a flat 'joininfo' list. The former arrangement grouped
the join clauses according to the set of unjoined relids used in each;
however, profiling on test cases involving lots of joins proves that
that data structure is a net loss. It takes more time to group the
join clauses together than is saved by avoiding duplicate tests later.
It doesn't help any that there are usually not more than one or two
clauses per group ...
Bruce Momjian [Thu, 9 Jun 2005 03:00:43 +0000 (03:00 +0000)]
Remove idea of schema tablespaces:
< o Allow databases and schemas to be moved to different tablespaces
<
< One complexity is whether moving a schema should move all existing
< schema objects or just define the location for future object creation.
<
> o Allow databases to be moved to different tablespaces 484c480
< schema. Global system tables can never be moved.
> tablespace. Global system tables can never be moved.
Tom Lane [Wed, 8 Jun 2005 23:02:05 +0000 (23:02 +0000)]
Marginal hack to avoid spending a lot of time in find_join_rel during
large planning problems: when the list of join rels gets too long, make
an auxiliary hash table that hashes on the identifying Bitmapset.
Tom Lane [Wed, 8 Jun 2005 21:15:29 +0000 (21:15 +0000)]
Remove grammar productions for prefix and postfix % and ^ operators,
as well as the existing pg_catalog entries for prefix and postfix %.
These have never been documented, though they did appear in one old
regression test. This avoids surprising behavior in cases like
"SELECT -25 % -10". Per recent discussion.
Note: although there is a catalog change here, I did not force initdb
since there's no harm in leaving the inaccessible entries in one's
copy of pg_operator.
Tom Lane [Wed, 8 Jun 2005 15:50:28 +0000 (15:50 +0000)]
Change WAL-logging scheme for multixacts to be more like regular
transaction IDs, rather than like subtrans; in particular, the information
now survives a database restart. Per previous discussion, this is
essential for PITR log shipping and for 2PC.
Bruce Momjian [Tue, 7 Jun 2005 14:12:07 +0000 (14:12 +0000)]
Fix word wrap:
< changes made by the interface driver for its internal use. One idea is
< for this to be a protocol-only feature. Another approach is to notify
< the protocol when a RESET CONNECTION command is used.
> changes made by the interface driver for its internal use. One idea
> is for this to be a protocol-only feature. Another approach is to
> notify the protocol when a RESET CONNECTION command is used.
Neil Conway [Tue, 7 Jun 2005 07:08:35 +0000 (07:08 +0000)]
Add a function lastval(), which returns the value returned by the
last nextval() or setval() performed by the current session. Update the
docs, add regression tests, and bump the catalog version. Patch from
Dennis Björklund, various improvements by Neil Conway.
Neil Conway [Tue, 7 Jun 2005 02:47:23 +0000 (02:47 +0000)]
Add support for an optional INTO clause to PL/PgSQL's EXECUTE command.
This allows the result of executing a SELECT to be assigned to a row
variable, record variable, or list of scalars. Docs and regression tests
updated. Per Pavel Stehule, improvements and cleanup by Neil Conway.
Bruce Momjian [Tue, 7 Jun 2005 01:59:39 +0000 (01:59 +0000)]
Update text for RESET CONNECTION:
< all temporary tables, removal of any NOTIFYs, cursors, prepared
< queries(?), currval()s, etc. This could be used for connection pooling.
< We could also change RESET ALL to have this functionality.
> temporary tables, removing any NOTIFYs, cursors, open transactions,
> prepared queries, currval()s, etc. This could be used for connection
> pooling. We could also change RESET ALL to have this functionality.
> The difficult of this features is allowing RESET ALL to not affect
> changes made by the interface driver for its internal use. One idea is
> for this to be a protocol-only feature. Another approach is to notify
> the protocol when a RESET CONNECTION command is used.
While playing around, I got the following error message:
--
FATAL: pre-existing shared memory block (key 5432001, ID 90898435) is
still in use
HINT: If you're sure there are no old server processes still running,
remove the shared memory block with the command "ipcrm", or just delete
the file "/home/hlinnaka/pgsql/data/postmaster.pid".
---
Thats normal because I used "kill -9 postmaster" to shut down.
The hint advises me to use "ipcrm", but there's the "ipcclean" script in
bin for just this purpose. The hint should probably advise to use
ipcclean.
The attached patch replaces all occurances of "ipcrm" with "ipcclean" in
src/backend/utils/init/miscinit.c and all the translations in
src/backend/po.
While reviewing the patch, I noticed a likely typo in hr.po. While I
don't
speak Croatian, the translation seems to advise to use the "icpm(1)"
command. I changed that to "ipcclean" too.
Tom Lane [Mon, 6 Jun 2005 20:22:58 +0000 (20:22 +0000)]
Modify XLogInsert API to make callers specify whether pages to be backed
up have the standard layout with unused space between pd_lower and pd_upper.
When this is set, XLogInsert will omit the unused space without bothering
to scan it to see if it's zero. That saves time in XLogInsert, and also
allows reversion of my earlier patch to make PageRepairFragmentation et al
explicitly re-zero freed space. Per suggestion by Heikki Linnakangas.
Tom Lane [Mon, 6 Jun 2005 17:01:25 +0000 (17:01 +0000)]
Remove the mostly-stubbed-out-anyway support routines for WAL UNDO.
That code is never going to be used in the foreseeable future, and
where it's more than a stub it's making the redo routines harder to
read.
Tom Lane [Mon, 6 Jun 2005 04:13:36 +0000 (04:13 +0000)]
Nab some low-hanging fruit: replace the planner's base_rel_list and
other_rel_list with a single array indexed by rangetable index.
This reduces find_base_rel from O(N) to O(1) without any real penalty.
While find_base_rel isn't one of the major bottlenecks in any profile
I've seen so far, it was starting to creep up on the radar screen
for complex queries --- so might as well fix it.
Tom Lane [Sun, 5 Jun 2005 22:32:58 +0000 (22:32 +0000)]
Remove planner's private fields from Query struct, and put them into
a new PlannerInfo struct, which is passed around instead of the bare
Query in all the planning code. This commit is essentially just a
code-beautification exercise, but it does open the door to making
larger changes to the planner data structures without having to muck
with the widely-known Query struct.
Bruce Momjian [Sun, 5 Jun 2005 03:39:54 +0000 (03:39 +0000)]
Add description for backend termination:
< cleaned up properly. A new signal is needed for safe termination.
> cleaned up properly. A new signal is needed for safe termination
> because backends must first do a query cancel, then exit once they
> have run the query cancel cleanup routine.
Tom Lane [Sun, 5 Jun 2005 00:38:11 +0000 (00:38 +0000)]
Replace the parser's namespace tree (which formerly had the same
representation as the jointree) with two lists of RTEs, one showing
the RTEs accessible by qualified names, and the other showing the RTEs
accessible by unqualified names. I think this is conceptually simpler
than what we did before, and it's sure a whole lot easier to search.
This seems to eliminate the parse-time bottleneck for deeply nested
JOIN structures that was exhibited by phil@vodafone.
Bruce Momjian [Sun, 5 Jun 2005 00:28:36 +0000 (00:28 +0000)]
Add TODO.detail.
< logs
> logs [pitr] 130c130
< * Allow a warm standby system to also allow read-only queries
> * Allow a warm standby system to also allow read-only queries [pitr]
Tom Lane <tgl@sss.pgh.pa.us> writes:
> a_ogawa <a_ogawa@hi-ho.ne.jp> writes:
> > It is a reasonable idea. However, the majority part of MemSet was not
> > able to be avoided by this idea. Because the per-tuple contexts are used
> > at the early stage of executor.
>
> Drat. Well, what about changing that? We could introduce additional
> contexts or change the startup behavior so that the ones that are
> frequently reset don't have any data in them unless you are working
> with pass-by-ref values inside the inner loop.
That might be possible. However, I think that we should change only
aset.c about this article.
I thought further: We can check whether context was used from the last
reset even when blocks list is not empty. Please see attached patch.
Here's an updated version of the patch, with the following changes:
1) No longer uses "service name" as "application version". It's instead
hardcoded as "postgres". It could be argued that this part should be
backpatched to 8.0, but it doesn't make a big difference until you can
start changing it with GUC / connection parameters. This change only
affects kerberos 5, not 4.
2) Now downcases kerberos usernames when the client is running on win32.
3) Adds guc option for "krb_caseins_users" to make the server ignore
case mismatch which is required by some KDCs such as Active Directory.
Off by default, per discussion with Tom. This change only affects
kerberos 5, not 4.
4) Updated so it doesn't conflict with the rendevouz/bonjour patch
already in ;-)
Bruce Momjian [Sat, 4 Jun 2005 20:33:06 +0000 (20:33 +0000)]
At 2005-05-21 20:18:50 +0530, ams@oryx.com wrote:
>
> > The second issue is where plperl returns a large result set.
I have attached the following seven patches to address this problem:
1. Trivial. Replaces some errant spaces with tabs.
2. Trivial. Fixes the spelling of Jan's name, and gets rid of many
inane, useless, annoying, and often misleading comments. Here's
a sample: "plperl_init_all() - Initialize all".
(I have tried to add some useful comments here and there, and will
continue to do so now and again.)
3. Trivial. Splits up some long lines.
4. Converts SRFs in PL/Perl to use a Tuplestore and SFRM_Materialize
to return the result set, based on the PL/PgSQL model.
There are two major consequences: result sets will spill to disk when
they can no longer fit in work_mem; and "select foo_srf()" no longer
works. (I didn't lose sleep over the latter, since that form is not
valid in PL/PgSQL, and it's not documented in PL/Perl.)
5. Trivial, but important. Fixes use of "undef" instead of undef. This
would cause empty functions to fail in bizarre ways. I suspect that
there's still another (old) bug here. I'll investigate further.
6. Moves the majority of (4) out into a new plperl_return_next()
function, to make it possible to expose the functionality to
Perl; cleans up some of the code besides.
7. Add an spi_return_next function for use in Perl code.
If you want to apply the patches and try them out, 8-composite.diff is
what you should use. (Note: my patches depend upon Andrew's use-strict
and %_SHARED patches being applied.)
Here's something to try:
create or replace function foo() returns setof record as $$
$i = 0;
for ("World", "PostgreSQL", "PL/Perl") {
spi_return_next({f1=>++$i, f2=>'Hello', f3=>$_});
}
return;
$$ language plperl;
select * from foo() as (f1 integer, f2 text, f3 text);
(Many thanks to Andrews Dunstan and Supernews for their help.)
Bruce Momjian [Sat, 4 Jun 2005 20:14:12 +0000 (20:14 +0000)]
Tom Lane <tgl@sss.pgh.pa.us> writes:
> a_ogawa <a_ogawa@hi-ho.ne.jp> writes:
> > It is a reasonable idea. However, the majority part of MemSet was not
> > able to be avoided by this idea. Because the per-tuple contexts are used
> > at the early stage of executor.
>
> Drat. Well, what about changing that? We could introduce additional
> contexts or change the startup behavior so that the ones that are
> frequently reset don't have any data in them unless you are working
> with pass-by-ref values inside the inner loop.
That might be possible. However, I think that we should change only
aset.c about this article.
I thought further: We can check whether context was used from the last
reset even when blocks list is not empty. Please see attached patch.
The effect of the patch that I measured is as follows:
o Execution time that executed the SQL ten times.
(1)Linux(CPU: Pentium III, Compiler option: -O2)
- original: 24.960s
- patched : 23.114s
Tom Lane [Sat, 4 Jun 2005 19:19:42 +0000 (19:19 +0000)]
Change expandRTE() and ResolveNew() back to taking just the single
RTE of interest, rather than the whole rangetable list. This makes
the API more understandable and avoids duplicate RTE lookups. This
patch reverts no-longer-needed portions of my patch of 2004-08-19.
Bruce Momjian [Sat, 4 Jun 2005 18:12:38 +0000 (18:12 +0000)]
Add:
> * Allow pg_ctl to work properly with configuration files located outside
> the PGDATA directory
>
> pg_ctl can not read the pid file because it isn't located in the
> config directory but in the PGDATA directory. The solution is to
> allow pg_ctl to read and understand postgresql.conf to find the
> data_directory value.
>
Neil Conway [Sat, 4 Jun 2005 02:07:09 +0000 (02:07 +0000)]
Remove unused 'printCost' field from ExplainState, and simplify the code
accordingly (this field was always initialized to true). Patch from
Alvaro Herrera.
Tom Lane [Fri, 3 Jun 2005 23:05:30 +0000 (23:05 +0000)]
Revise handling of dropped columns in JOIN alias lists to avoid a
performance problem pointed out by phil@vodafone: to wit, we were
spending O(N^2) time to check dropped-ness in an N-deep join tree,
even in the case where the tree was freshly constructed and couldn't
possibly mention any dropped columns. Instead of recursing in
get_rte_attribute_is_dropped(), change the data structure definition:
the joinaliasvars list of a JOIN RTE must have a NULL Const instead
of a Var at any position that references a now-dropped column. This
costs nothing during normal parse-rewrite-plan path, and instead we
have a linear-time update to make when loading a stored rule that
might contain now-dropped columns. While at it, move the responsibility
for acquring locks on relations referenced by rules into this separate
function (which I therefore chose to call AcquireRewriteLocks).
This saves effort --- namely, duplicated lock grabs in parser and rewriter
--- in the normal path at a cost of one extra non-locked heap_open()
in the stored-rule path; seems a good tradeoff. A fringe benefit is
that it is now *much* clearer that we acquire lock on relations referenced
in rules before we make any rewriter decisions based on their properties.
(I don't know of any bug of that ilk, but it wasn't exactly clear before.)
Tom Lane [Fri, 3 Jun 2005 19:00:12 +0000 (19:00 +0000)]
Just noticed that you can't Query-Cancel a long planner run, because
no part of the planner did CHECK_FOR_INTERRUPTS(). Add one in a
suitably strategic spot.
Tom Lane [Thu, 2 Jun 2005 21:03:25 +0000 (21:03 +0000)]
Push enable/disable of notify and catchup interrupts all the way down
to just around the bare recv() call that gets a command from the client.
The former placement in PostgresMain was unsafe because the intermediate
processing layers (especially SSL) use facilities such as malloc that are
not necessarily re-entrant. Per report from counterstorm.com.
Michael Meskes [Thu, 2 Jun 2005 12:35:11 +0000 (12:35 +0000)]
- Fixed memory leak in ecpglib by adding some missing free() commands.
- Added patch by Gavin Scott <gavin@planetacetech.com> for Intel 64bit hardware.
Tom Lane [Thu, 2 Jun 2005 05:55:29 +0000 (05:55 +0000)]
Change CRCs in WAL records from 64bit to 32bit for performance reasons.
Instead of a separate CRC on each backup block, include backup blocks
in their parent WAL record's CRC; this is important to ensure that the
backup block really goes with the WAL record, ie there was not a page
tear right at the start of the backup block. Implement a simple form
of compression of backup blocks: drop any run of zeroes starting at
pd_lower, so as not to store the unused 'hole' that commonly exists in
PG heap and index pages. Tweak PageRepairFragmentation and related
routines to ensure they keep the unused space zeroed, so that the above
compression method remains effective. All per recent discussions.
Tom Lane [Wed, 1 Jun 2005 17:05:11 +0000 (17:05 +0000)]
patternsel() was improperly stripping RelabelType from the derived
expressions it constructed, causing scalarineqsel to become confused
if the underlying variable was of a domain type. Per report from
Kevin Grittner.
Tom Lane [Tue, 31 May 2005 19:10:28 +0000 (19:10 +0000)]
Add test to WAL replay to verify that xl_prev points back to the previous
WAL record; this is necessary to be sure we recognize stale WAL records
when a WAL page was only partially written during a system crash.
Tom Lane [Tue, 31 May 2005 03:03:59 +0000 (03:03 +0000)]
Teach ruleutils to drill down into RECORD-type Vars in the same way
that the parser now can, so that it can reverse-list cases involving
FieldSelect from a RECORD Var.
Tom Lane [Tue, 31 May 2005 01:03:23 +0000 (01:03 +0000)]
ParseComplexProjection should make use of expandRecordVariable so that
it can handle cases like (foo.x).y where foo is a subquery and x is
a function-returning-RECORD RTE in that subquery.
Tom Lane [Mon, 30 May 2005 23:09:07 +0000 (23:09 +0000)]
Document get_call_result_type() and friends; mark TypeGetTupleDesc()
and RelationNameGetTupleDesc() as deprecated; remove uses of the
latter in the contrib library. Along the way, clean up crosstab()
code and documentation a little.
Bruce Momjian [Mon, 30 May 2005 21:12:23 +0000 (21:12 +0000)]
Move to ALTER section:
< * Prevent child tables from altering constraints like CHECK that were
< inherited from the parent table 470a469,471
>
> o Prevent child tables from altering constraints like CHECK that were
> inherited from the parent table