Per discussion of bug #3877.  Simon Riggs, some fixes by moi.

zero with a CASE expression.  Per gripe from Russell Smith.

no-longer-maintained PgAccess.  Per Erik Rijkers.

 * The temporary enabling of the caller opcode here is to work around a
 * bug in perl 5.10, which unkindly changed the way its Safe.pm works, without
 * notice. It is quite safe, as caller is informational only, and in any case
 * we only enable it while we load the 'strict' module.

wrong because of mismatched byte ordering.

regis.  Correct the latter's oversight that a bracket-expression needs to be
terminated.  Reduce the ereports to elogs, since they are now not expected to
ever be hit (thus addressing Alvaro's original complaint).
In passing, const-ify the string argument to RS_compile.

to format properly for the actually needed column width, instead of having
a hard-wired assumption about the longest command name length.  Also make it
respond to the current screen width.  In passing, const-ify the constant
table.

On other platforms it's better to let the Makefile handle it, but we want
the regression tests to be invokable without make on Windows.  A batch
file would be a better solution, but no time for that before 8.3.
Per my discovery that this breaks testing under SELinux, and subsequent
discussion.

must commit after autoconf ... and yes, I used the right autoconf

main code path for enlarging libpq's input buffer in one swoop when needing to
read a long data message.  Without this, the code will double the buffer size,
read more data, notice it still hasn't got the whole message, and repeat till
it finally has a large enough buffer.  Which wastes a lot of data-moving
effort and also memory (since malloc probably can't do anything very useful
with the freed-up smaller buffers).  Not sure why this wasn't there already;
certainly the COPY data path is a place where we're quite likely to see long
data messages.  I'm not backpatching though, since this is just a marginal
performance issue rather than a real bug.

subquery output column exactly once left-to-right.  Although this is the case
in the original parser output, it might not be so after rewriting and
constant-folding, as illustrated by bug #3882 from Jan Mate.  Instead
scan the subquery's target list to obtain needed per-column information;
this is duplicative of what the parser did, but only a couple dozen lines
need be copied, and we can clean up a couple of notational uglinesses.
Bug was introduced in 8.2 as part of revision of SubLink representation.

constraint, the constraint is renamed as well.  This avoids inconsistent
situations that could confuse pg_dump (not to mention humans).  We might at
some point provide ALTER TABLE RENAME CONSTRAINT as a more general solution,
but there seems no reason not to allow doing it this way too.  Per bug #3854
and related discussions.

Jun Kuwamura

Erik Rijkers

Marko Kreen

the PATH responsive to the installation prefix, which was the apparent
intent of the previous edit, but not well executed.

fixed length arrays to prevent array's overrun. Per report by
Hannes Dorbath <light@theendofthetunnel.de> and comments by Tom.

ParameterStatus message can be sent during COPY OUT: it's definitely
possible, since COPY from a SELECT subquery can trigger any user-defined
function.

introduced in rewrite to make CLUSTER MVCC-safe.

in whichever context happens to be current during a call of an xml.c function,
use a dedicated context that will not go away until we explicitly delete it
(which we do at transaction end or subtransaction abort).  This makes recovery
after an error much simpler --- we don't have to individually delete the data
structures created by libxml.  Also, we need to initialize and cleanup libxml
only once per transaction (if there's no error) instead of once per function
call, so it should be a bit faster.  We'll need to keep an eye out for
intra-transaction memory leaks, though.  Alvaro and Tom.

>
> * Add the ability to automatically create materialized views
>
>   Right now materialized views require the user to create triggers on the
>   main table to keep the summary table current.  SQL syntax should be able
>   to manager the triggers and summary table automatically.  A more
>   sophisticated implementation would automatically retrieve from the
>   summary table when the main table is referenced, if possible.
>

This is to avoid uselessly requiring superuser permissions to restore
the dump without errors.  Pretty grotty, but no better alternative seems
available, at least not in the near term.

during transaction abort, per my note from a couple days ago.

we need to be able to swallow NOTICE messages, and potentially also
ParameterStatus messages (although the latter would be a bit weird),
without exiting COPY OUT state.  Fix it, and adjust the protocol documentation
to emphasize the need for this.  Per off-list report from Alexander Galler.

distinguished from user-invoked commands.  Per suggestion from Tom Lane.

higher than zero.  Same problem as just detected in CREATE INDEX
CONCURRENTLY.

Noted while looking for heapscans that might need to start from block
zero.