with a plpgsql-defined cursor. The underlying mechanism for this is that the
main SQL engine will now take "WHERE CURRENT OF $n" where $n is a refcursor
parameter. Not sure if we should document that fact or consider it an
implementation detail. Per discussion with Pavel Stehule.
< o Allow UPDATE/DELETE WHERE CURRENT OF cursor
<
< This requires using the row ctid to map cursor rows back to the
< original heap row. This become more complicated if WITH HOLD cursors
< are to be supported because WITH HOLD cursors have a copy of the row
< and no FOR UPDATE lock.
< http://archives.postgresql.org/pgsql-hackers/2007-01/msg01014.php
<
> o -Allow UPDATE/DELETE WHERE CURRENT OF cursor
Along the way, allow FOR UPDATE in non-WITH-HOLD cursors; there may once
have been a reason to disallow that, but it seems to work now, and it's
really rather necessary if you want to select a row via a cursor and then
update it in a concurrent-safe fashion.
Original patch by Arul Shaji, rather heavily editorialized by Tom Lane.
value for the vacuum code. Instead, make zero signify getting the value from a
higher level configuration facility, just like -1 in the original coding. We
still document that -1 is the value that disables the feature, to avoid
confusing the user unnecessarily.
Reported by Galy Lee in <200705310914.l4V9E6JA094603@wwwmaster.postgresql.org>;
per subsequent discussion.
for each temp file, rather than once per sort or hashjoin; this allows
spreading the data of a large sort or join across multiple tablespaces.
(I remain dubious that this will make any difference in practice, but certain
people insisted.) Arrange to cache the results of parsing the GUC variable
instead of recomputing from scratch on every demand, and push usage of the
cache down to the bottommost fd.c level.
were accepted by prior Postgres releases. This takes care of the loose end
left by the preceding patch to downgrade implicit casts-to-text. To avoid
breaking desirable behavior for array concatenation, introduce a new
polymorphic pseudo-type "anynonarray" --- the added concatenation operators
are actually text || anynonarray and anynonarray || text.
from the other string-category types; this eliminates a lot of surprising
interpretations that the parser could formerly make when there was no directly
applicable operator.
Create a general mechanism that supports casts to and from the standard string
types (text,varchar,bpchar) for *every* datatype, by invoking the datatype's
I/O functions. These new casts are assignment-only in the to-string direction,
explicit-only in the other, and therefore should create no surprising behavior.
Remove a bunch of thereby-obsoleted datatype-specific casting functions.
The "general mechanism" is a new expression node type CoerceViaIO that can
actually convert between *any* two datatypes if their external text
representations are compatible. This is more general than needed for the
immediate feature, but might be useful in plpgsql or other places in future.
This commit does nothing about the issue that applying the concatenation
operator || to non-text types will now fail, often with strange error messages
due to misinterpreting the operator as array concatenation. Since it often
(not always) worked before, we should either make it succeed or at least give
a more user-friendly error; but details are still under debate.
Peter Eisentraut and Tom Lane
(Possibly release notes material, lest users be confused.)
The --quiet option is now obsolete and without effect in createdb,
createuser, dropdb, dropuser; kept for compatibility but marked for
removal in 8.4.
Progress messages when acting on all databases now go to stdout instead
of stderr, since they are not in fact errors.
Ordered options in reindexdb reference page alphabetically, like in
other programs' pages.
o -Add a GUC variable to control the tablespace for temporary objects
and sort files
<
< It could start with a random tablespace from a supplied list and
< cycle through the list.
<
tablespace(s) in which to store temp tables and temporary files. This is a
list to allow spreading the load across multiple tablespaces (a random list
element is chosen each time a temp object is to be created). Temp files are
not stored in per-database pgsql_tmp/ directories anymore, but per-tablespace
directories.
Jaime Casanova and Albert Cervera, with review by Bernd Helmle and Tom Lane.
< * Allow free-behind capability for large sequential scans, perhaps using
< posix_fadvise()
> * Allow free-behind capability for large sequential scans to avoid
> kernel cache spoiling
scan-resistant:
<
< * Allow free-behind capability for large sequential scans, perhaps using
< posix_fadvise()
<
< Posix_fadvise() can control both sequential/random file caching and
< free-behind behavior, but it is unclear how the setting affects other
< backends that also have the file open, and the feature is not supported
< on all operating systems.
type. Also, add explicit casts between boolean and text/varchar. Both
of these changes are for conformance with SQL:2003.
Update the regression tests, bump the catversion.
< * Consider allowing 64-bit integers to be passed by value on 64-bit
< platforms
> * Consider allowing 64-bit integers and floats to be passed by value on
> 64-bit platforms
>
> Also change 32-bit floats (float4) to be passed by value at the same
> time.
>
* Improve speed with indexes
For large table adjustments during VACUUM FULL, it is faster to cluster
or reindex rather than update the index. Also, index updates can bloat
the index.
"microsecond" and "millisecond" units were not considered valid input
by themselves, which caused inputs like "1 millisecond" to be rejected
erroneously.
Update the docs, add regression tests, and backport to 8.2 and 8.1
- Function renamed to "xpath".
- Function is now strict, per discussion.
- Return empty array in case when XPath expression detects nothing
(previously, NULL was returned in such case), per discussion.
- (bugfix) Work with fragments with prologue: select xpath('/a',
'<?xml version="1.0"?><a /><b />'); // now XML datum is always wrapped
with dummy <x>...</x>, XML prologue simply goes away (if any).
- Some cleanup.
Nikolay Samokhvalov
Some code cleanup and documentation work by myself.
>
> * Implement the SQL standard mechanism whereby REVOKE ROLE revokes only
> the privilege granted by the invoking role, and not those granted
> by other roles
parentheses in syntax descriptions. Consistently use the present tense
when describing the basic purpose of each "DROP" command. Add a few
more hyperlinks.
"autovacuum = off", the system may still periodically start autovacuum
processes to prevent XID wraparound. Patch from David Fetter, with
editorializing.
named foo, would work but the other ordering would not. If a user-specified
type or table name collides with an existing auto-generated array name, just
rename the array type out of the way by prepending more underscores. This
should not create any backward-compatibility issues, since the cases in which
this will happen would have failed outright in prior releases.
Also fix an oversight in the arrays-of-composites patch: ALTER TABLE RENAME
renamed the table's rowtype but not its array type.
needs to check the new constraint against columns of derived domains too.
Also, make it error out if the domain to be modified is used within any
composite-type columns. Eventually we should support that case, but it seems
a bit painful, and not suitable for a back-patch. For the moment just let the
user know we can't do it.
Backpatch to 8.2, which is the only released version that allows nested
domains. Possibly the other part should be back-patched further.
and views (but not system catalogs, nor sequences or toast tables). Get rid
of the hardwired convention that a type's array type is named exactly "_type",
instead using a new column pg_type.typarray to provide the linkage. (It still
will be named "_type", though, except in odd corner cases such as
maximum-length type names.)
Along the way, make tracking of owner and schema dependencies for types more
uniform: a type directly created by the user has these dependencies, while a
table rowtype or auto-generated array type does not have them, but depends on
its parent object instead.
David Fetter, Andrew Dunstan, Tom Lane
sign convention from everyplace else in Postgres. I don't suppose that
this will stop people from being confused, but at least we can say that
it's documented.
< Last updated: Sat May 5 10:47:39 EDT 2007
> Last updated: Sat May 5 11:39:57 EDT 2007
< * Flush cached query plans when the dependent objects change,
< when the cardinality of parameters changes dramatically, or
> * -Flush cached query plans when the dependent objects change or
<
< A more complex solution would be to save multiple plans for different
< cardinality and use the appropriate plan based on the EXECUTE values.
<
< * Track dependencies in function bodies and recompile/invalidate
<
< This is particularly important for references to temporary tables
< in PL/PgSQL because PL/PgSQL caches query plans. The only workaround
< in PL/PgSQL is to use EXECUTE. One complexity is that a function
< might itself drop and recreate dependent tables, causing it to
< invalidate its own query plan.
<
< * Invalidate prepared queries, like INSERT, when the table definition
> * -Track dependencies in function bodies and recompile/invalidate
> * -Invalidate prepared queries, like INSERT, when the table definition
< * Invalidate prepared queries, like INSERT, when the table definition
< is altered
>
> * Invalidate prepared queries, like INSERT, when the table definition
> is altered
> * -Allow ORDER BY ... LIMIT # to select high/low value without sort or
<
< Right now, if no index exists, ORDER BY ... LIMIT # requires we sort
< all values to return the high/low value. Instead The idea is to do a
< sequential scan to find the high/low value, thus avoiding the sort.
< MIN/MAX already does this, but not for LIMIT > 1.
<
< o Add support for MOVE and SCROLL cursors
<
< PL/pgSQL cursors should support the same syntax as
< backend cursors.
<
> o -Add support for MOVE cursors
> o Add support for SCROLL cursors
RESET SESSION, RESET PLANS, and RESET TEMP are now DISCARD ALL,
DISCARD PLANS, and DISCARD TEMP, respectively. This is to avoid
confusion with the pre-existing RESET variants: the DISCARD
commands are not actually similar to RESET. Patch from Marko
Kreen, with some minor editorialization.
This is needed to allow a security-definer function to set a truly secure
value of search_path. Without it, a malicious user can use temporary objects
to execute code with the privileges of the security-definer function. Even
pushing the temp schema to the back of the search path is not quite good
enough, because a function or operator at the back of the path might still
capture control from one nearer the front due to having a more exact datatype
match. Hence, disable searching the temp schema altogether for functions and
operators.
Security: CVE-2007-2138
< Currently all schemas are owned by the super-user because they are
< copied from the template1 database.
> Currently all schemas are owned by the super-user because they are copied
> from the template1 database. However, since all objects are inherited
> from the template database, it is not clear that setting schemas to the db
> owner is correct.
processes to be running simultaneously. Also, now autovacuum processes do not
count towards the max_connections limit; they are counted separately from
regular processes, and are limited by the new GUC variable
autovacuum_max_workers.
The launcher now has intelligence to launch workers on each database every
autovacuum_naptime seconds, limited only on the max amount of worker slots
available.
Also, the global worker I/O utilization is limited by the vacuum cost-based
delay feature. Workers are "balanced" so that the total I/O consumption does
not exceed the established limit. This part of the patch was contributed by
ITAGAKI Takahiro.
Per discussion.
access to the planner's cursor-related planning options, and provide new
FETCH/MOVE routines that allow access to the full power of those commands.
Small refactoring of planner(), pg_plan_query(), and pg_plan_queries()
APIs to make it convenient to pass the planning options down from SPI.
This is the core-code portion of Pavel Stehule's patch for scrollable
cursor support in plpgsql; I'll review and apply the plpgsql changes
separately.
< o Consider reducing on-disk varlena length from four to two
< because a heap row cannot be more than 64k in length
> o Consider reducing on-disk varlena length from four bytes to
> two because a heap row cannot be more than 64k in length
reviewed by Neil Conway. This patch adds the following DDL command
variants: RESET SESSION, RESET TEMP, RESET PLANS, CLOSE ALL, and
DEALLOCATE ALL. RESET SESSION is intended for use by connection
pool software and the like, in order to reset a client session
to something close to its initial state.
Note that while most of these command variants can be executed
inside a transaction block (but are not transaction-aware!),
RESET SESSION cannot. While this is inconsistent, it is intended
to catch programmer mistakes: RESET SESSION in an open transaction
block is probably unintended.
This commit breaks any code that assumes that the mere act of forming a tuple
(without writing it to disk) does not "toast" any fields. While all available
regression tests pass, I'm not totally sure that we've fixed every nook and
cranny, especially in contrib.
Greg Stark with some help from Tom Lane
Add the latter to the values checked in pg_control, since it can't be changed
without invalidating toast table content. This commit in itself shouldn't
change any behavior, but it lays some necessary groundwork for experimentation
with these toast-control numbers.
Note: while TOAST_TUPLE_THRESHOLD can now be changed without initdb, some
thought still needs to be given to needs_toast_table() in toasting.c before
unleashing random changes.
< * Add idle_timeout GUC so locks are not held for log periods of time
> * Add transaction_idle_timeout GUC so locks are not held for long
> periods of time
> o Have timestamp subtraction not call justify_hours()?
>
> http://archives.postgresql.org/pgsql-sql/2006-10/msg00059.php
>
< o Add overflow checking to timestamp and interval arithmetic
> o Add overflow checking to timestamp and interval arithmetic
< o Add table function support to pltcl, plpython
> o Add table function support to pltcl, plpythonu
< o Add PL/Python tracebacks
> o Add PL/PythonU tracebacks
< o Allow PL/Python to return boolean rather than 1/0
> o Allow PL/PythonU to return boolean rather than 1/0
o Add more logical syntax CLUSTER table USING index;
< o Add more logical syntax CLUSTER table ORDER BY index;
> o Add more logical syntax CLUSTER table USING index;
ecpglib supports it.
Change configure (patch from Bruce) and msvc build system to no longer require
pthreads on win32, since all parts of postgresql can be thread-safe using the
native platform functions.
< * %Add pg_get_acldef(), pg_get_typedefault(), pg_get_attrdef(),
< pg_get_tabledef(), pg_get_domaindef(), pg_get_functiondef()
<
< These would be for application use, not for use by pg_dump.
<
>
> * Allow configuration of backend priorities via the operating system
>
> Though backend priorities make priority inversion during lock
> waits possible, research shows that this is not a huge problem.
> http://archives.postgresql.org/pgsql-general/2007-02/msg00493.php
A DBA is allowed to create a language in his database if it's marked
"tmpldbacreate" in pg_pltemplate. The factory default is that this is set
for all standard trusted languages, but of course a superuser may adjust
the settings. In service of this, add the long-foreseen owner column to
pg_language; renaming, dropping, and altering owner of a PL now follow
normal ownership rules instead of being superuser-only.
Jeremy Drake, with some editorialization by Tom Lane.
Vadim had included this restriction in the original design of the SPI code,
but I'm darned if I can see a reason for it.
I left the macro definition of SPI_ERROR_CURSOR in place, so as not to
needlessly break any SPI callers that are checking for it, but that code
will never actually be returned anymore.
< * Add NUMERIC division operator that doesn't round?
<
< Currently NUMERIC _rounds_ the result to the specified precision.
< This means division can return a result that multiplied by the
< divisor is greater than the dividend, e.g. this returns a value > 10:
<
< SELECT (10::numeric(2,0) / 6::numeric(2,0))::numeric(2,0) * 6;
<
< The positive modulus result returned by NUMERICs might be considered
< inaccurate, in one sense.
<
and regexp_split_to_table. These functions provide access to the
capture groups resulting from a POSIX regular expression match,
and provide the ability to split a string on a POSIX regular
expression, respectively. Patch from Jeremy Drake; code review by
Neil Conway, additional comments and suggestions from Tom and
Peter E.
This patch bumps the catversion, adds some regression tests,
and updates the docs.
rules to be defined with different, per session controllable, behaviors
for replication purposes.
This will allow replication systems like Slony-I and, as has been stated
on pgsql-hackers, other products to control the firing mechanism of
triggers and rewrite rules without modifying the system catalog directly.
The firing mechanisms are controlled by a new superuser-only GUC
variable, session_replication_role, together with a change to
pg_trigger.tgenabled and a new column pg_rewrite.ev_enabled. Both
columns are a single char data type now (tgenabled was a bool before).
The possible values in these attributes are:
'O' - Trigger/Rule fires when session_replication_role is "origin"
(default) or "local". This is the default behavior.
'D' - Trigger/Rule is disabled and fires never
'A' - Trigger/Rule fires always regardless of the setting of
session_replication_role
'R' - Trigger/Rule fires when session_replication_role is "replica"
The GUC variable can only be changed as long as the system does not have
any cached query plans. This will prevent changing the session role and
accidentally executing stored procedures or functions that have plans
cached that expand to the wrong query set due to differences in the rule
firing semantics.
The SQL syntax for changing a triggers/rules firing semantics is
ALTER TABLE <tabname> <when> TRIGGER|RULE <name>;
<when> ::= ENABLE | ENABLE ALWAYS | ENABLE REPLICA | DISABLE
psql's \d command as well as pg_dump are extended in a backward
compatible fashion.
Jan
uses SPI plans, this finally fixes the ancient gotcha that you can't
drop and recreate a temp table used by a plpgsql function.
Along the way, clean up SPI's API a little bit by declaring SPI plan
pointers as "SPIPlanPtr" instead of "void *". This is cosmetic but
helps to forestall simple programming mistakes. (I have changed some
but not all of the callers to match; there are still some "void *"'s
in contrib and the PL's. This is intentional so that we can see if
anyone's compiler complains about it.)
POSIX-style timezone specs that don't exactly match any database entry will
be treated as having correct USA DST rules. Also, document that this can
be changed if you want to use some other DST rules with a POSIX zone spec.
We could consider changing localtime.c's TZDEFRULESTRING, but since that
facility can only deal with one DST transition rule, it seems fairly useless
now; might as well just plan to override it using a "posixrules" entry.
Backpatch as far as 8.0. There isn't much we can do in 7.x ... either your
libc gets it right, or it doesn't.
now complete). Update for the MSVC6/Borland support now being only libpq.
Move most of the information about full MSVC build from README file into
documentation.
log_min_messages does; and arrange to suppress the duplicative output
that would otherwise result from log_statement and log_duration messages.
Bruce Momjian and Tom Lane.
this, add a 16-bit "flags" field to page headers by stealing some bits from
pd_tli. We use one flag bit as a hint to indicate whether there are any
unused line pointers; the remaining 15 are available for future use.
This is a cut-down form of an idea proposed by Hiroki Kataoka in July 2005.
At the time it was rejected because the original patch increased the size of
page headers and it wasn't clear that the benefit outweighed the distributed
cost. The flag-bit approach gets most of the benefit without requiring an
increase in the page header size.
Heikki Linnakangas and Tom Lane
<li>PostgreSQL is licensed under a BSD license. By posting a patch
to the public PostgreSQL mailling lists, you are giving the PostgreSQL
Global Development Group the non-revokable right to distribute your
patch under the BSD license. If you use code that is available under
some other license that is BSD compatible (eg. public domain), please
note that in your email submission.</li>
Get rid of VARATT_SIZE and VARATT_DATA, which were simply redundant with
VARSIZE and VARDATA, and as a consequence almost no code was using the
longer names. Rename the length fields of struct varlena and various
derived structures to catch anyplace that was accessing them directly;
and clean up various places so caught. In itself this patch doesn't
change any behavior at all, but it is necessary infrastructure if we hope
to play any games with the representation of varlena headers.
Greg Stark and Tom Lane
useless substructure for its RangeTblEntry nodes. (I chose to keep using the
same struct node type and just zero out the link fields for unneeded info,
rather than making a separate ExecRangeTblEntry type --- it seemed too
fragile to have two different rangetable representations.)
Along the way, put subplans into a list in the toplevel PlannedStmt node,
and have SubPlan nodes refer to them by list index instead of direct pointers.
Vadim wanted to do that years ago, but I never understood what he was on about
until now. It makes things a *whole* lot more robust, because we can stop
worrying about duplicate processing of subplans during expression tree
traversals. That's been a constant source of bugs, and it's finally gone.
There are some consequent simplifications yet to be made, like not using
a separate EState for subplans in the executor, but I'll tackle that later.
< o Add long file support for binary pg_dump output
<
< While Win32 supports 64-bit files, the MinGW API does not,
< meaning we have to build an fseeko replacement on top of the
< Win32 API, and we have to make sure MinGW handles it. Another
< option is to wait for the MinGW project to fix it, or use the
< code from the LibGW32C project as a guide.
<
< http://archives.postgresql.org/pgsql-hackers/2006-12/msg00551.php
<
> o -Add long file support for binary pg_dump output
< Currently, ALTER USER and ALTER DATABASE support per-user and
> Currently ALTER USER and ALTER DATABASE support per-user and
< Currently, subtracting one date from another that crosses a
> Currently subtracting one date from another that crosses a
< Currently, SQL-language functions can only refer to parameters via $1, etc
> Currently SQL-language functions can only refer to dollar parameters,
> e.g. $1
< Currently, queries prepared via the libpq API are planned on first
> Currently queries prepared via the libpq API are planned on first
< Currently, SET <tab> causes a database lookup to check all
> Currently SET <tab> causes a database lookup to check all
< Currently, all statement results are transferred to the libpq
> Currently all statement results are transferred to the libpq
>
> o Allow row and record variables to be set to NULL constants,
> and allow NULL tests on such variables
>
> Because a row is not scalar, do not allow assignment
> from NULL-valued scalars.
to_timestamp():
- ID for day-of-week
- IDDD for day-of-year
This makes it possible to convert ISO week dates to and from text
fully represented in either week ('IYYY-IW-ID') or day-of-year
('IYYY-IDDD') format.
I have also added an 'isoyear' field for use with extract / date_part.
Brendan Jurd
o read global SSL configuration file
o add GUC "ssl_ciphers" to control allowed ciphers
o add libpq environment variable PGSSLKEY to control SSL hardware keys
Victor B. Wagner
equality checks it applies, instead of a random dependence on whatever
operators might be named "=". The equality operators will now be selected
from the opfamily of the unique index that the FK constraint depends on to
enforce uniqueness of the referenced columns; therefore they are certain to be
consistent with that index's notion of equality. Among other things this
should fix the problem noted awhile back that pg_dump may fail for foreign-key
constraints on user-defined types when the required operators aren't in the
search path. This also means that the former warning condition about "foreign
key constraint will require costly sequential scans" is gone: if the
comparison condition isn't indexable then we'll reject the constraint
entirely. All per past discussions.
Along the way, make the RI triggers look into pg_constraint for their
information, instead of using pg_trigger.tgargs; and get rid of the always
error-prone fixed-size string buffers in ri_triggers.c in favor of building up
the RI queries in StringInfo buffers.
initdb forced due to columns added to pg_constraint and pg_trigger.
< * Merge xmin/xmax/cmin/cmax back into three header fields
<
< Before subtransactions, there used to be only three fields needed to
< store these four values. This was possible because only the current
< transaction looks at the cmin/cmax values. If the current transaction
< created and expired the row the fields stored where xmin (same as
< xmax), cmin, cmax, and if the transaction was expiring a row from a
< another transaction, the fields stored were xmin (cmin was not
< needed), xmax, and cmax. Such a system worked because a transaction
< could only see rows from another completed transaction. However,
< subtransactions can see rows from outer transactions, and once the
< subtransaction completes, the outer transaction continues, requiring
< the storage of all four fields. With subtransactions, an outer
< transaction can create a row, a subtransaction expire it, and when the
< subtransaction completes, the outer transaction still has to have
< proper visibility of the row's cmin, for example, for cursors.
<
< One possible solution is to create a phantom cid which represents a
< cmin/cmax pair and is stored in local memory. Another idea is to
< store both cmin and cmax only in local memory.
<
> * -Merge xmin/xmax/cmin/cmax back into three header fields
< * Consider placing all sequences in a single table, now that system
< tables are full transactional
> * Consider placing all sequences in a single table
already collected in the current transaction; this allows plpgsql functions to
watch for stats updates even though they are confined to a single transaction.
Use this instead of the previous kluge involving pg_stat_file() to wait for
the stats collector to update in the stats regression test. Internally,
decouple storage of stats snapshots from transaction boundaries; they'll
now stick around until someone calls pgstat_clear_snapshot --- which xact.c
still does at transaction end, to maintain the previous behavior. This makes
the logic a lot cleaner, at the price of a couple dozen cycles per transaction
exit.
<P>USA saving time changes are included in PostgreSQL release 8.0.[4+],
and all later major releases, e.g. 8.1. Canada and Western Australia
changes are included in 8.0.[10+], 8.1.[6+], and all later major
releases. PostgreSQL releases prior to 8.0 use the operating system's
timezone database for daylight saving information.</P>
Standard English uses "may", "can", and "might" in different ways:
may - permission, "You may borrow my rake."
can - ability, "I can lift that log."
might - possibility, "It might rain today."
Unfortunately, in conversational English, their use is often mixed, as
in, "You may use this variable to do X", when in fact, "can" is a better
choice. Similarly, "It may crash" is better stated, "It might crash".
Standard English uses "may", "can", and "might" in different ways:
may - permission, "You may borrow my rake."
can - ability, "I can lift that log."
might - possibility, "It might rain today."
Unfortunately, in conversational English, their use is often mixed, as
in, "You may use this variable to do X", when in fact, "can" is a better
choice. Similarly, "It may crash" is better stated, "It might crash".
Standard English uses "may", "can", and "might" in different ways:
may - permission, "You may borrow my rake."
can - ability, "I can lift that log."
might - possibility, "It might rain today."
Unfortunately, in conversational English, their use is often mixed, as
in, "You may use this variable to do X", when in fact, "can" is a better
choice. Similarly, "It may crash" is better stated, "It might crash".
Also update two error messages mentioned in the documenation to match.
In this case extractQuery should returns -1 as nentries. This changes
prototype of extractQuery method to use int32* instead of uint32* for
nentries argument.
Based on that gincostestimate may see two corner cases: nothing will be found
or seqscan should be used.
Per proposal at http://archives.postgresql.org/pgsql-hackers/2007-01/msg01581.php
PS tsearch_core patch should be sightly modified to support changes, but I'm
waiting a verdict about reviewing of tsearch_core patch.
>
> * Add REINDEX CONCURRENTLY, like CREATE INDEX CONCURRENTLY
>
> This is difficult because you must upgrade to an exclusive table lock
> to replace the existing index file. CREATE INDEX CONCURRENTLY does not
> have this complication. This would allow index compaction without
> downtime.
more, and standard_conforming_strings less, because in the future non-E
strings will not treat backslashes specially.
Also use E'' strings where backslashes are used in examples. (The
existing examples would have drawn warnings.)
Backpatch to 8.2.X.
- Add new SQL command SET XML OPTION (also available via regular GUC) to
control the DOCUMENT vs. CONTENT option in implicit parsing and
serialization operations.
- Subtle corrections in the handling of the standalone property in
xmlroot().
- Allow xmlroot() to work on content fragments.
- Subtle corrections in the handling of the version property in
xmlconcat().
- Code refactoring for producing XML declarations.
discussions.
<
<
< ---------------------------------------------------------------------------
<
<
< Developers who have claimed items are:
< --------------------------------------
< * Alvaro is Alvaro Herrera <alvherre@dcc.uchile.cl>
< * Andrew is Andrew Dunstan <andrew@dunslane.net>
< * Bruce is Bruce Momjian <bruce@momjian.us> of EnterpriseDB
< * Christopher is Christopher Kings-Lynne <chriskl@familyhealth.com.au> of
< Family Health Network
< * D'Arcy is D'Arcy J.M. Cain <darcy@druid.net> of The Cain Gang Ltd.
< * David is David Fetter <david@fetter.org>
< * Fabien is Fabien Coelho <coelho@cri.ensmp.fr>
< * Gavin is Gavin Sherry <swm@linuxworld.com.au> of Alcove Systems Engineering
< * Greg is Greg Sabino Mullane <greg@turnstep.com>
< * Jan is Jan Wieck <JanWieck@Yahoo.com> of Afilias, Inc.
< * Joe is Joe Conway <mail@joeconway.com>
< * Karel is Karel Zak <zakkr@zf.jcu.cz>
< * Magnus is Magnus Hagander <mha@sollentuna.net>
< * Marc is Marc Fournier <scrappy@hub.org> of PostgreSQL, Inc.
< * Matthew T. O'Connor <matthew@zeut.net>
< * Michael is Michael Meskes <meskes@postgresql.org> of Credativ
< * Neil is Neil Conway <neilc@samurai.com>
< * Oleg is Oleg Bartunov <oleg@sai.msu.su>
< * Pavel is Pavel Stehule <pavel.stehule@hotmail.com>
< * Peter is Peter Eisentraut <peter_e@gmx.net>
< * Philip is Philip Warner <pjw@rhyme.com.au> of Albatross Consulting Pty. Ltd.
< * Rod is Rod Taylor <pg@rbt.ca>
< * Simon is Simon Riggs <simon@2ndquadrant.com>
< * Stephan is Stephan Szabo <sszabo@megazone23.bigpanda.com>
< * Tatsuo is Tatsuo Ishii <ishii@sraoss.co.jp> of SRA OSS, Inc. Japan
< * Teodor is Teodor Sigaev <teodor@sigaev.ru>
< * Tom is Tom Lane <tgl@sss.pgh.pa.us> of Red Hat
FAMILY; and add FAMILY option to CREATE OPERATOR CLASS to allow adding a
class to a pre-existing family. Per previous discussion. Man, what a
tedious lot of cutting and pasting ...
columns procost and prorows, to allow simple user adjustment of the estimated
cost of a function call, as well as control of the estimated number of rows
returned by a set-returning function. We might eventually wish to extend this
to allow function-specific estimation routines, but there seems to be
consensus that we should try a simple constant estimate first. In particular
this provides a relatively simple way to control the order in which different
WHERE clauses are applied in a plan node, which is a Good Thing in view of the
fact that the recent EquivalenceClass planner rewrite made that much less
predictable than before.
provide just a boolean 'amcanorder', instead of fields that specify the
sort operator strategy numbers. We have decided to require ordering-capable
AMs to use btree-compatible strategy numbers, so the old fields are
overkill (and indeed misleading about what's allowed).
match the postgresql.conf file. Also add units to descriptions that
lacked them. Wording improvements. Mention pg_settings.unit as the way
to find the default units for setting.
Backpatch to 8.2.X.
representation of equivalence classes of variables. This is an extensive
rewrite, but it brings a number of benefits:
* planner no longer fails in the presence of "incomplete" operator families
that don't offer operators for every possible combination of datatypes.
* avoid generating and then discarding redundant equality clauses.
* remove bogus assumption that derived equalities always use operators
named "=".
* mergejoins can work with a variety of sort orders (e.g., descending) now,
instead of tying each mergejoinable operator to exactly one sort order.
* better recognition of redundant sort columns.
* can make use of equalities appearing underneath an outer join.
The implementation is somewhat ugly logic-wise, but I don't see an
easy way to make it more concise.
When writing this, I noticed that my previous implementation of
width_bucket() doesn't handle NaN correctly:
postgres=# select width_bucket('NaN', 1, 5, 5);
width_bucket
--------------
6
(1 row)
AFAICS SQL:2003 does not define a NaN value, so it doesn't address how
width_bucket() should behave here. The patch changes width_bucket() so
that ereport(ERROR) is raised if NaN is specified for the operand or the
lower or upper bounds to width_bucket(). For float8, NaN is disallowed
for any of the floating-point inputs, and +/- infinity is disallowed
for the histogram bounds (but allowed for the operand).
Update docs and regression tests, bump the catversion.
standard convention the 21st century runs from 2001-2100, not 2000-2099,
so make it work like that. Per bug #2885 from Akio Iwaasa.
Backpatch to 8.2, but no further, since this is really a definitional
change; users of older branches are probably more interested in stability.
< * Allow the creation of indexes with mixed ascending/descending
> * -Allow the creation of indexes with mixed ascending/descending
<
< This is possible now by creating an operator class with reversed sort
< operators. One complexity is that NULLs would then appear at the start
< of the result set, and this might affect certain sort types, like
< merge join.
<
per-column options for btree indexes. The planner's support for this is still
pretty rudimentary; it does not yet know how to plan mergejoins with
nondefault ordering options. The documentation is pretty rudimentary, too.
I'll work on improving that stuff later.
Note incompatible change from prior behavior: ORDER BY ... USING will now be
rejected if the operator is not a less-than or greater-than member of some
btree opclass. This prevents less-than-sane behavior if an operator that
doesn't actually define a proper sort ordering is selected.
< * Improve the MONEY data type
> * -Make 64-bit version of the MONEY data type
> * Add locale-aware MONEY type, and support multiple currencies
< Change the MONEY data type to use DECIMAL internally, with special
< locale-aware output formatting.
< http://archives.postgresql.org/pgsql-hackers/2006-09/msg01107.php
>
> * Make consistent use of long/short command options --- pg_ctl needs
> long ones, pg_config doesn't have short ones, postgres doesn't have
> enough long ones, etc.
> o Consider parsing the -c string into individual queries so each
> is run in its own transaction
>
> o Consider disallowing multiple queries in PQexec() as an
> additional barrier to SQL injection attacks
< * Allow inherited tables to inherit index, UNIQUE constraint, and primary
< key, foreign key
< * UNIQUE INDEX on base column not honored on INSERTs/UPDATEs from
< inherited table: INSERT INTO inherit_table (unique_index_col) VALUES
< (dup) should fail
<
< The main difficulty with this item is the problem of creating an index
< that can span more than one table.
<
< * Allow SELECT ... FOR UPDATE on inherited tables
> * Inheritance
>
> o Allow inherited tables to inherit indexes, UNIQUE constraints,
> and primary/foreign keys
> o Honor UNIQUE INDEX on base column in INSERTs/UPDATEs
> on inherited table, e.g. INSERT INTO inherit_table
> (unique_index_col) VALUES (dup) should fail
>
> The main difficulty with this item is the problem of
> creating an index that can span multiple tables.
>
> o Allow SELECT ... FOR UPDATE on inherited tables
>
>
>
an optarg). Add some comments noting that code in three different files has
to be kept in sync. Fix erroneous description of -S switch (it sets work_mem
not silent_mode), and do some light copy-editing elsewhere in postgres-ref.
< * Move some /contrib modules out to their own project sites
<
< Particularly, move GPL-licensed /contrib/userlock and
< /contrib/dbmirror/clean_pending.pl.
<
the XmlExpr code in various lists, use a representation that has some hope
of reverse-listing correctly (though it's still a de-escaping function
shy of correctness), generally try to make it look more like Postgres
coding conventions.
cases. Operator classes now exist within "operator families". While most
families are equivalent to a single class, related classes can be grouped
into one family to represent the fact that they are semantically compatible.
Cross-type operators are now naturally adjunct parts of a family, without
having to wedge them into a particular opclass as we had done originally.
This commit restructures the catalogs and cleans up enough of the fallout so
that everything still works at least as well as before, but most of the work
needed to actually improve the planner's behavior will come later. Also,
there are not yet CREATE/DROP/ALTER OPERATOR FAMILY commands; the only way
to create a new family right now is to allow CREATE OPERATOR CLASS to make
one by default. I owe some more documentation work, too. But that can all
be done in smaller pieces once this infrastructure is in place.
operator strategy numbers, ie, GiST and GIN. This is almost cosmetic
enough to not need a catversion bump, but since the opr_sanity regression
test has to change in sync with the catalog entry, I figured I'd better
do one.
properly.
Remove SGML docs about openjade performance patch, and instead add
comment in style sheet where indenting code is commented out.
Backpatch to 8.2.X.
>
> * Embedded server (not wanted)
>
> While PostgreSQL clients runs fine limited-resource environments, the
> server requires multiple processes and a stable pool of resources to
> run reliabily and efficiently. Stripping down the PostgreSQL server
> to run in the same process address space as the client application
> would add too much complexity and failure cases.
< * Have EXPLAIN ANALYZE highlight poor optimizer estimates
> * Have EXPLAIN ANALYZE issue NOTICE messages when the estimated and
> actual row counts differ by a specified percentage
in normal operation, and we can avoid rewriting pg_control at every log
segment switch if we don't insist that these values be valid. Reducing
the number of pg_control updates is a good idea for both performance and
reliability. It does make pg_resetxlog's life a bit harder, but that seems
a good tradeoff; and anyway the change to pg_resetxlog amounts to automating
something people formerly needed to do by hand, namely look at the existing
pg_xlog files to make sure the new WAL start point was past them.
In passing, change the wording of xlog.c's "database system was interrupted"
messages: describe the pg_control timestamp as "last known up at" rather than
implying it is the exact time of service interruption. With this change the
timestamp will generally be the time of the last checkpoint, which could be
many minutes before the failure; and we've already seen indications that
people tend to misinterpret the old wording.
initdb forced due to change in pg_control layout. Simon Riggs and Tom Lane
identify long-running transactions. Since we already need to record
the transaction-start time (e.g. for now()), we don't need any
additional system calls to report this information.
Catversion bumped, initdb required.
locks that logically should not be released, because when a subtransaction
overwrites XMAX all knowledge of the previous lock state is lost. It seems
unlikely that we will be able to fix this before 8.3...
subtransaction are released if the subtransaction aborts --- in user-level
terminology, this means either rolling back to a savepoint or escaping from
a plpgsql exception block. Per recent suggestion from Simon.