bgwriter is now a much less important process, responsible for page
cleaning duties only. checkpointer is now responsible for checkpoints
and so has a key role in shutdown. Later patches will correct doc
references to the now old idea that bgwriter performs checkpoints.
Has beneficial effect on performance at high write rates, but mainly
refactoring to more easily allow changes for power reduction by
simplifying previously tortuous code around required to allow page
cleaning and checkpointing to time slice in the same process.

Patch by me, Review by Dickson Guedes

The existing scan-direction-sensitive tests were overly complex, and
failed to stop the scan in cases where it's perfectly legitimate to do so.
Per bug #6278 from Maksym Boguk.

Back-patch to 8.3, which is as far back as the patch applies easily.
Doesn't seem worth sweating over a relatively minor performance issue in
8.2 at this late date.  (But note that this was a performance regression
from 8.1 and before, so 8.2 is being left as an outlier.)

The POSIX spec defines locale fields for controlling the ordering of the
value, sign, and currency symbol in monetary output, but cash_out only
supported a small subset of these options.  Fully implement p/n_sign_posn,
p/n_cs_precedes, and p/n_sep_by_space per spec.  Fix up cash_in so that
it will accept all these format variants.

Also, make sure that thousands_sep is only inserted to the left of the
decimal point, as required by spec.

Per bug #6144 from Eduard Kracmar and discussion of bug #6277.  This patch
includes some ideas from Alexander Lakhin's proposed patch, though it is
very different in detail.

Make sure that it considers all the possibilities that the old code did,
instead of trying only one possibility per character position.  To keep the
runtime in bounds, instead tweak the character incrementers to not try
every possible multibyte character code.  Remove unnecessary logic to
restore the old character value on failure.  Additional comment and
formatting cleanup.

Recent work on index-only scans left this somewhat out of date.

cash_out failed to handle multiple-byte thousands separators, as per bug
#6277 from Alexander Law.  In addition, cash_in didn't handle that either,
nor could it handle multiple-byte positive_sign.  Both routines failed to
support multiple-byte mon_decimal_point, which I did not think was worth
changing, but at least now they check for the possibility and fall back to
using '.' rather than emitting invalid output.  Also, make cash_in handle
trailing negative signs, which formerly it would reject.  Since cash_out
generates trailing negative signs whenever the locale tells it to, this
last omission represents a fail-to-reload-dumped-data bug.  IMO that
justifies patching this all the way back.

This infrastructure doesn't in any way guarantee that the character
we produce will sort before the one we incremented; but it does at least
make it much more likely that we'll end up with something that is a valid
character, which improves our chances.

Kyotaro Horiguchi, with various adjustments by me.

new cluster.   vacuumdb, used by pg_upgrade, still has this dependency.

We need not wait until the commit record is durably on disk, because
in the event of a crash the page we're updating with hint bits will
be gone anyway.  Per off-list report from Heikki Linnakangas, this
can significantly degrade the performance of unlogged tables; I was
able to show a 2x speedup from this patch on a pgbench run with scale
factor 15.  In practice, this will mostly help small, heavily updated
tables, because on larger tables you're unlikely to run into the same
row again before the commit record makes it out to disk.

Testing reveals that this macro is a hot-spot for index-only-scans.
Per discussion with Tom Lane.

This doesn't appear to accompish anything useful, and does make the
restore fail if the postgres database happens to have been dropped.

Make sure ecpg/include/ is rebuilt before the other subdirectories,
so that ecpg_config.h is up to date.  This is not likely to matter
during production builds, only development, so no back-patch.

Kevin Grittner

Report by Vik Reykja, patch by Kevin Grittner.

in the old cluster.

The recent unpleasantness with copyrights has accelerated a move that
was already in planning.

one lock per backend or auxiliary process - the need for a lock for each
aux processes was not accounted for in NumLWLocks(). No-one noticed,
because the three locks needed for the three aux processes fit into the
few extra lwlocks we allocate for 3rd party modules that don't call
RequestAddinLWLocks() (NUM_USER_DEFINED_LWLOCKS, 4 by default).

The original implementation of ELSIF in plpgsql converted the construct
into nested simple IF statements.  This was prone to stack overflow with
long ELSIF lists, in two different ways.  First, it's difficult to generate
the parsetree without using right-recursion in the bison grammar, and
that's prone to parser stack overflow since nothing can be reduced until
the whole list has been read.  Second, we'd recurse during execution, thus
creating an unnecessary risk of execution-time stack overflow.  Rewrite
so that the ELSIF list is represented as a flat list, scanned via iteration
not recursion, and generated through left-recursion in the grammar.
Per a gripe from Håvard Kongsgård.

We should generally use left-recursion not right-recursion to parse lists.
Bison hasn't got any built-in way to check for this type of inefficiency,
and I didn't find anything on the net in a quick search, so I wrote a
little Perl script to do it.  Add to src/tools/ so we don't have to
re-invent this wheel next time we wonder if we're doing anything stupid.

Currently, the only place that seems to need fixing is plpgsql's stmt_else
production, so the problem doesn't appear to be common enough to warrant
trying to include such a test in our standard build process.  If we did
want to do that, we'd need a way to ignore some false positives, such as
a_expr := '-' a_expr

expect -> except, noted by Andrew Dunstan.  Also, "cannot" seems more
readable here than "can not", per David Wheeler.

If the right-hand side of a semijoin is unique, then we can treat it like a
normal join (or another way to say that is: we don't need to explicitly
unique-ify the data before doing it as a normal join).  We were recognizing
such cases when the RHS was a sub-query with appropriate DISTINCT or GROUP
BY decoration, but there's another way: if the RHS is a plain relation with
unique indexes, we can check if any of the indexes prove the output is
unique.  Most of the infrastructure for that was there already in the join
removal code, though I had to rearrange it a bit.  Per reflection about a
recent example in pgsql-performance.

lines.  Update pg_bsd_indent required version to 1.1 (and update ftp
site).

Problem reported by Magnus.

Add option for parallel streaming of the transaction log while a
base backup is running, to get the logfiles before the server has
removed them.

Also add a tool called pg_receivexlog, which streams the transaction
log into files, creating a log archive without having to wait for
segments to complete, thus decreasing the window of data loss without
having to waste space using archive_timeout. This works best in
combination with archive_command - suggested usage docs etc coming later.

Use names like "RI_ConstraintTrigger_a_NNNN" for FK action triggers and
"RI_ConstraintTrigger_c_NNNN" for FK check triggers.  This ensures the
action trigger fires first in self-referential cases where the very same
row update fires both an action and a check trigger.  This change provides
a non-probabilistic solution for bug #6268, at the risk that it could break
client code that is making assumptions about the exact names assigned to
auto-generated FK triggers.  Hence, change this in HEAD only.  No need for
forced initdb since old triggers continue to work fine.

When a foreign-key constraint references another column of the same table,
row updates will queue both the PK's ON UPDATE action and the FK's CHECK
action in the same event.  The ON UPDATE action must execute first, else
the CHECK will check a non-final state of the row and possibly throw an
inappropriate error, as seen in bug #6268 from Roman Lytovchenko.

Now, the firing order of multiple triggers for the same event is determined
by the sort order of their pg_trigger.tgnames, and the auto-generated names
we use for FK triggers are "RI_ConstraintTrigger_NNNN" where NNNN is the
trigger OID.  So most of the time the firing order is the same as creation
order, and so rearranging the creation order fixes it.

This patch will fail to fix the problem if the OID counter wraps around or
adds a decimal digit (eg, from 99999 to 100000) while we are creating the
triggers for an FK constraint.  Given the small odds of that, and the low
usage of self-referential FKs, we'll live with that solution in the back
branches.  A better fix is to change the auto-generated names for FK
triggers, but it seems unwise to do that in stable branches because there
may be client code that depends on the naming convention.  We'll fix it
that way in HEAD in a separate patch.

Back-patch to all supported branches, since this bug has existed for a long
time.

On non-windows platform, we just ignore any value set there.

Noted by Jaime Casanova

This allows different instances to use the eventlog with different
identifiers, by setting the event_source GUC, similar to how
syslog_ident works.

Original patch by MauMau, heavily modified by Magnus Hagander

Not just tables, since views also work fine with the
TABLE command.

Andreas Karlsson, reviewed by Josh Kupershmidt

Use the CommitDate not the AuthorDate, as the former is representative of
the order in which things went into the main repository, and the latter
isn't very; we now have instances where the AuthorDate is as much as a
month before the patch really went in.  Also, get rid of the "commit order
inversions" heuristic, which turns out not to do anything very desirable.
Instead we just print commits in strict timestamp order, interpreting the
"timestamp" of a merged commit as its timestamp on the newest branch it
appears in.  This fixes some cases where very ancient commits were being
printed relatively early in the report.

The uniqueness condition might fail to hold intra-transaction, and assuming
it does can give incorrect query results.  Per report from Marti Raudsepp,
though this is not his proposed patch.

Back-patch to 9.0, where both these features were introduced.  In the
released branches, add the new IndexOptInfo field to the end of the struct,
to try to minimize ABI breakage for third-party code that may be examining
that struct.

A transaction can export a snapshot with pg_export_snapshot(), and then
others can import it with SET TRANSACTION SNAPSHOT.  The data does not
leave the server so there are not security issues.  A snapshot can only
be imported while the exporting transaction is still running, and there
are some other restrictions.

I'm not totally convinced that we've covered all the bases for SSI (true
serializable) mode, but it works fine for lesser isolation modes.

Joachim Wieland, reviewed by Marko Tiikkaja, and rather heavily modified
by Tom Lane

No need to do  "errcode(errcode_for_file_access())", just
"errcode_for_file_access()" is enough. The extra errcode() call is useless
but harmless, so there's no user-visible bug here. Nevertheless, backpatch
to 9.1 where this code were added.

Avoid possibly dumping core when pgstat_track_activity_query_size has a
less-than-default value; avoid uselessly searching for the query string
of a successfully-exited backend; don't bother putting out an ERRDETAIL if
we don't have a query to show; some other minor stylistic improvements.