operations are now run as subtransactions, so that errors in them
can be reported as ordinary Perl or Tcl errors and caught by the
normal error handling convention of those languages.  Also do some
minor code cleanup in pltcl.c: extract a large chunk of duplicated
code in pltcl_SPI_execute and pltcl_SPI_execute_plan into a shared
subroutine.

the year from a BC date, but failed to make the same fix in
date_part(timestamptz).

is nothing to do, which is most of the time.  This is another simple
improvement to cut subtransaction entry/exit overhead.

no need for it to be nearly as big as the global hash table, and since
it's not in shared memory it can grow if it does need to be bigger.
By reducing the size, we speed up hash_seq_search(), which saves a
significant fraction of subtransaction entry/exit overhead.

rather than longjmp'ing clear out of Perl and thereby leaving Perl in
a broken state.  Also some minor prettification of error messages.
Still need to do something with spi_exec_query() error handling.

to the original List; per report from Sebastian BÎck.  I think this is
the last such bug --- I examined every lcons() call in the backend and
the rest seem OK --- but it's nervous-making that we're still finding
'em so many months after the List rewrite went in.

the regression test shared libraries.

collector until the transaction commits.  Per recent discussion, this
should avoid confusing autovacuum when an updating transaction runs for
a long time.

postgresql.crt file simply isn't there, too.

free operations in client_cert_cb --- openssl will also attempt to free
these structures, resulting in core dumps.

switch syntax when calling ld directly.

for the languages even when not installed in a standard directory.
pltcl may need this treatment as well, but we don't have the right path
conveniently available, so I'll leave it alone as long as there aren't
actual reports of trouble.

in terms of macro 'rpathdir', as I proposed a few weeks ago.  In itself
this commit shouldn't change the behavior at all, but it opens the door
to using special rpaths for the PL shared libraries, as seems to be
needed for plperl in particular.

may expand the Perl stack, therefore we must SPAGAIN to reload the local
stack pointer after calling it.  Also a couple other marginal readability
improvements.

this is to avoid scenarios where incoming backends find no live copies
of a database's row because the only live copy is in an as-yet-unwritten
shared buffer, which they can't see.  Also, use FlushRelationBuffers()
for forcing out pg_database, instead of the much more expensive BufferSync().
There's no need to write out pages belonging to other relations.

some of the bugs exposed thereby.  The remaining 'might be used uninitialized'
warnings look like live bugs, but I am not familiar enough with Perl/C hacking
to tell how to fix them.

avoid repalloc'ing twice when once is sufficient.

of minus zero.  Per Andrew Dunstan.

Fabien COELHO

Reini Urban

Just paranoia ...

Rather than using ReadBuffer() to increment the reference count on an
already-pinned buffer, we should use IncrBufferRefCount() as it is
faster and does not require acquiring the BufMgrLock.

been defined. Patch from Gavin Sherry, editorializing by Neil Conway.

even uglier than it was already :-(.  Also, on Windows only, use temporary
shared memory segments instead of ordinary files to pass over critical
variable values from postmaster to child processes.  Magnus Hagander

more than 65K columns, or when the created table has more than 65K columns
due to adding inherited columns from parent relations. Fix a similar
crash when processing SELECT queries with more than 65K target list
entries. In all three cases we would eventually detect the error and
elog, but the check was being made too late.

patch, but allow srand and disallow sprintf as per subsequent discussion.