This was previously not very useful, but with many people customizing
the linestyle, it is nice for a consistent appearance.

When testing the stderr produced by various thread-support flags, also
run a compilation in addition to a link, because clang warns on
certain flags when compiling but not when linking.

The first argument of PyEval_EvalCode() was changed from PyCodeObject*
to PyObject* because of PEP 384.

always zeros.  Also no need to free memory before we exit.

Standby optionally sends back information about oldestXmin of queries
which is then checked and applied to the WALSender's proc->xmin.
GetOldestXmin() is modified slightly to agree with GetSnapshotData(),
so that all backends on primary include WALSender within their snapshots.
Note this does nothing to change the snapshot xmin on either master or
standby. Feedback piggybacks on the standby reply message.
vacuum_defer_cleanup_age is no longer used on standby, though parameter
still exists on primary, since some use cases still exist.

Simon Riggs, review comments from Fujii Masao, Heikki Linnakangas, Robert Haas

This seems a bit more user-friendly.

Per report from, and discussion with, Fujii Masao.

(I'm not entirely sure that we've finished bikeshedding the syntax details,
but the functionality seems OK.)

Pavel Stehule, reviewed by Stephen Frost and Tom Lane

Fujii Masao, reviewed by Robert Haas, Stephen Frost, and Magnus Hagander.

They are expected to be used by extension modules like file_fdw.
There are no user-visible changes.

Itagaki Takahiro
Reviewed and tested by Kevin Grittner and Noah Misch.

output.

Normally, pg_dump summarily excludes functions in pg_catalog from
consideration.  However, some extensions may create functions in pg_catalog
(adminpack already does that, and extensions for procedural languages will
likely do it too).  In binary-upgrade mode, we have to dump such functions,
or the extension will be incomplete after upgrading.  Per experimentation
with adminpack.

Recent releases had a check on rel->rd_refcnt in heap_drop_with_catalog,
but failed to cover the possibility of pending trigger events at DROP time.
(Before 8.4 we didn't even check the refcnt.)  When the trigger events were
eventually fired, you'd get "could not open relation with OID nnn" errors,
as in recent report from strk.  Better to throw a suitable error when the
DROP is attempted.

Also add a similar check in DROP INDEX.

Back-patch to all supported branches.

All the other ones that are primarily a new datatype say "data type for
<purpose>", so make this one similar.

Comment about MaxAllocSize was not updated when the TOAST-header macros
were replaced in 8.3 "varvarlena" changes.  Per report from Frederik Ramm.

Per reports from Fujii Masao.

The new name, max_pred_locks_per_transaction, is shorter.

Kevin Grittner, per discussion.

Also add make check-world target, and refactor pg_regress invocation
code in makefiles a bit.

When the new type is an unconstrained domain over the old type, we don't
need to rewrite the table.

Noah Misch and Robert Haas

Initially it was called int_aggregate after the old SQL file, but since
the documentation just says "intagg" and that's also the directory name,
let's conform to that instead.

Noted by Bernd Helmle

though must not update the last transaction timestamp.
Plus comment and message cleanup for recent named restore point.

Fujii Masao, minor changes by me

Untested, but we'll soon see if the buildfarm likes this.

The original design of pg_available_extensions did not consider the
possibility of version-specific control files.  Split it into two views:
pg_available_extensions shows information that is generic about an
extension, while pg_available_extension_versions shows all available
versions together with information that could be version-dependent.
Also, add an SRF pg_extension_update_paths() to assist in checking that
a collection of update scripts provide sane update path sequences.

Bug report and fix by Andres Freund

From first pass of testing.  Notably, there seems to be no need for
adminpack--unpackaged--1.0.sql because none of the objects that the
old module creates would ever be dumped by pg_dump anyway (they are
all in pg_catalog).

It was never terribly consistent to use OR REPLACE (because of the lack of
comparable functionality for data types, operators, etc), and
experimentation shows that it's now positively pernicious in the extension
world.  We really want a failure to occur if there are any conflicts, else
it's unclear what the extension-ownership state of the conflicted object
ought to be.  Most of the time, CREATE EXTENSION will fail anyway because
of conflicts on other object types, but an extension defining only
functions can succeed, with bad results.

This isn't fully tested as yet, in particular I'm not sure that the
"foo--unpackaged--1.0.sql" scripts are OK.  But it's time to get some
buildfarm cycles on it.

sepgsql is not converted to an extension, mainly because it seems to
require a very nonstandard installation process.

Dimitri Fontaine and Tom Lane

This avoids the need to find a way to make PGXS' .sql.in-to-.sql rule
insert the right thing.  We'll just deprecate use of that hack for
extensions.

This allows us to have an unambiguous rule for deconstructing the names
of script files and secondary control files, without having to forbid
extension and version names from containing any dashes.  We do have to
forbid them from containing double dashes or leading/trailing dashes,
but neither restriction is likely to bother anyone in practice.
Per discussion, this seems like a better solution overall than the
original design.

format.

Modify PQescapeStringConn() docs to be consisent with other escaping
functions.

Add mention problems with pre-9.0 versions of libpq using not understanding
bytea hex format to the 9.0 release notes.

Backpatch to 9.0 docs.