The pre-test has been shown to be a big loss on Opterons and at best a
wash on EM64T.

valid type information if they are asked to fetch the values part of a
pg_statistic slot; these arguments are unneeded if fetching only the
numbers part.  Use this to save a catcache lookup in btcostestimate,
which is looking like a bit of a hotspot in recent profiling.  Not a
big savings, but since it's essentially free, might as well do it.

A RestrictInfo representing an OR clause now contains two versions of
the contained expression, one with sub-RestrictInfos and one without.
clause_selectivity() should descend to the version with sub-RestrictInfos
so that it has a chance of caching its results for the OR's sub-clauses.
Failing to do so resulted in redundant planner effort.

emit when given the --clean option, in favor of individual DROP ROLE
commands.  The old technique could not possibly work in 8.1, and was
never a very good idea anyway IMHO.  The DROP ROLE approach has the
defect that the DROPs will fail for roles that own objects or have
privileges, but perhaps we can improve that later.

ie removing shared-dependency entries, should happen before non-rollbackable
ones.  That way a failure during the rollbackable part doesn't leave us
with inconsistent state.

traceable to grant options.  As per my earlier proposal, a GRANT made by
a role member has to be recorded as being granted by the role that actually
holds the grant option, and not the member.

like '23:59:60' because of fractional-second roundoff problems.  Trying
to control this upstream of the actual display code was hopeless; the right
way is to explicitly round fractional seconds in the display code and then
refigure the results if the fraction rounds up to 1.  Per bug #1927.

to call krb5_sname_to_principal() always.  Also, use krb_srvname rather
than the hardwired string 'postgres' as the appl_version string in the
krb5_sendauth/recvauth calls, to avoid breaking compatibility with PG
8.0.  Magnus Hagander

initialization.  Add spinlocking, fix EXEC_BACKEND unsafeness.

Per request from Marc Munro.

testing ownership if the caller isn't interested in any GOPTION bits
(which is the common case).  It did not matter in 8.0 where the ownership
test was just a trivial equality test, but it matters now.

level for unrecognized win32 error codes to LOG, and make messages
conform to style guide.  Per old suggestion from Qingqing Zhou, which
seems to have gotten lost in the shuffle.

Remove unportable use of tfind/tsearch in favor of bsearch.  Fix up
random number generator to use random() not rand() and to actually honor
its min/max arguments properly.  That wasn't so important before, but
with exposure of capability to ask for general ranges, it will be.

< * Consider compressing indexes by storing key prefix values shared by
> * Consider compressing indexes by storing key values duplicated in
735a736,737
>
>   This is difficult because it requires datatype-specific knowledge.

<
> * Consider compressing indexes by storing key prefix values shared by
>   several rows as a single index entry

CREATE TABLE command, and translate dBase's 'M' field type to 'text'.

cache lookup in the success case.  This won't help much for cases where
the given relation is far down the search path, but it does not hurt in
any cases either; and it requires only a little new code.  Per gripe from
Jim Nasby about slowness of \d with many tables.

current backend in pg_listener, so there is little point in making
the PID to register part of async.c's public API. Other minor tweaks.

the parameter's name (if any) as the default column name for SELECT FROM
the function, rather than the function name as previously.  I still think
this is a bad idea, but I lost the argument.  Force decompilation of
function RTEs to specify full aliases always, to reduce the odds of this
decision breaking dumped views.

predicate_implied_by() to detect redundant filter conditions, but forgot
that predicate_implied_by() assumes its first argument contains only
immutable functions.  Add a check to guarantee that.  Also, test to see
if filter conditions can be discarded because they are redundant with
the predicate of a partial index.

information item is not available.

generated by bitmap index scans.  Along the way, simplify and speed up
the code for counting sequential and index scans; it was both confusing
and inefficient to be taking care of that in the per-tuple loops, IMHO.
initdb forced because of internal changes in pg_stat view definitions.

fixes by Neil Conway.

comment, it can at least test whether the expression returns set.