database privileges from a pre-8.2 server.  This ensures that the reloaded
database will maintain the same behavior it had in the previous installation,
ie, everybody has connect privilege.  Per gripe from L Bayuk.

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.

form '^(foo)$'.  Before, these could never be optimized into indexscans.
The recent changes to make psql and pg_dump generate such patterns (for \d
commands and -t and related switches, respectively) therefore represented
a big performance hit for people with large pg_class catalogs, as seen in
recent gripe from Erik Jones.  While at it, be more paranoid about
case-sensitivity checking in multibyte encodings, and fix some other
corner cases in which a regex might be interpreted too liberally.

document why this happens.  Remove exp() errno check because not needed.

having md.c return a success/failure boolean to smgr.c, which was just going
to elog anyway, let md.c issue the elog messages itself.  This allows better
error reporting, particularly in cases such as "short read" or "short write"
which Peter was complaining of.  Also, remove the kluge of allowing mdread()
to return zeroes from a read-beyond-EOF: this is now an error condition
except when InRecovery or zero_damaged_pages = true.  (Hash indexes used to
require that behavior, but no more.)  Also, enforce that mdwrite() is to be
used for rewriting existing blocks while mdextend() is to be used for
extending the relation EOF.  This restriction lets us get rid of the old
ad-hoc defense against creating huge files by an accidental reference to
a bogus block number: we'll only create new segments in mdextend() not
mdwrite() or mdread().  (Again, when InRecovery we allow it anyway, since
we need to allow updates of blocks that were later truncated away.)
Also, clean up the original makeshift patch for bug #2737: move the
responsibility for padding relation segments to full length into md.c.

only return Nan and set errno for pow/exp overflow/underflow.

platforms set errno, and we already have a check macro that detects
under/overflow, so there is no reason for platform-specific code
anymore.

with other places.

isinf(), fall through to our own infinity checks.

code path in tablecmds.c that wasn't exercised at all before.

infrastructure.

The purpose is to allow autovacuum-esq conditional vacuuming and
clustering using SQL to discover the required stats.

No documentation updates required.  Catalog version updated.

Glen Parker

valid result from a computation if one of the input values was infinity.
The previous code assumed an operation that returned infinity was an
overflow.

Handle underflow/overflow consistently, and add checks for aggregate
overflow.

Consistently prevent Inf/Nan from being cast to integer data types.

Fix INT_MIN % -1 to prevent overflow.

Update regression results for new error text.

Per report from Roman Kononov.

pg_opclass during LookupOpclassInfo(), I'd turned pg_opclass_oid_index
into a critical system index.  However the problem could only manifest
during a backend's first attempt to load opclass data, and then only
if it had successfully loaded pg_internal.init and subsequently received
a relcache flush; which made it impossible to reproduce in sequential
tests and darn hard even in parallel tests.  Memo to self: when
exercising cache flush scenarios, must disable LookupOpclassInfo's
internal cache too.

about typmod representation for standard types out into type-specific
typmod I/O functions.  Teodor Sigaev, with some editorialization by
Tom Lane.

Magnus Hagander

or contradictory keys even in cross-data-type scenarios.  This is another
benefit of the opfamily rewrite: we can find the needed comparison
operators now.

>   http://archives.postgresql.org/pgsql-hackers/2006-12/msg01213.php

< * Add a GUC to control whether BEGIN inside a transcation should abort
<   the transaction.

for use with constraint exclusion.  We can prove those cases now...

predicate operators.  The hard stuff turns out to be already done in the
previous commit, we need merely open the floodgates...

< * Move some /contrib modules out to their own project sites
<
<   Particularly, move GPL-licensed /contrib/userlock and
<   /contrib/dbmirror/clean_pending.pl.
<

the 8.1 SQL function definition for it.  Per report from Rajesh Kumar Mallah,
such a DBA error doesn't seem at all improbable, and the cost of checking for
it is not very high compared to the cost of running this function.  (It would
have been better to change the C name of the function so it wouldn't be called
by the old SQL definition, but it's too late for that now in the 8.2 branch.)

do this for ordinary SQL commands, so it seems consistent to do it for
backslash commands too.  Per gripe from Rajesh Kumar Mallah.

Per Thorkil Olesen.